Chemistry — Matter, Elements & Chemical Reactions

Why This Chapter Matters

Every RRB NTPC paper carries 2 to 4 questions from current science and technology, and this is the one General Awareness zone where last year's coaching PDF is already stale. Static history does not change; ISRO's launch record does, every few months. Railway recruitment boards specifically favour questions on India's space missions, biotechnology breakthroughs, and telecom rollouts because these topics sit at the intersection of "current affairs" and "science," letting one question test both memory and reading habit at once.

The single biggest mistake aspirants make here is memorising mission names without their purpose and agency, so when a question flips the phrasing — asking "which mission studied the Sun" instead of "what is Aditya-L1" — they freeze despite knowing the name cold. This chapter is built the other way round: purpose first, name second, so the fact survives however the question is worded. Treat every mission, satellite, and award in this chapter as a fact you should be able to state in your own words, not just recognise on sight.

1. Space Technology — ISRO's Recent Record

The Indian Space Research Organisation (ISRO), headquartered in Bengaluru, remains the country's nodal space agency, and its recent missions form the backbone of this section.

Chandrayaan-3 is the standout recent achievement. Launched in July 2023 aboard the LVM3 rocket, it achieved a soft landing on the Moon's south polar region on 23 August 2023, making India the fourth country to achieve a controlled lunar landing (after the USA, the erstwhile Soviet Union, and China) and the first country to land near the lunar south pole specifically. The lander module was named Vikram (after Vikram Sarabhai, the father of India's space programme) and the rover was named Pragyan. India now marks 23 August as National Space Day to commemorate this landing.

Exam trap: Students often confuse Chandrayaan-2 and Chandrayaan-3. Chandrayaan-2 (2019) carried an orbiter, lander, and rover, but its lander crashed during descent; only the orbiter survived and continued functioning. Chandrayaan-3 reused a similar lander-rover design but skipped a fresh orbiter, instead using a propulsion module that carried the lander to lunar orbit and then continued as an Earth-observation experiment from lunar orbit itself.

Aditya-L1, launched in September 2023, is India's first dedicated solar observation mission. It travels not to the Sun directly but to a special gravitationally stable point called Lagrange Point 1 (L1), roughly 1.5 million kilometres from Earth toward the Sun, where it can observe the Sun continuously without any eclipse interference. Think of L1 as a parking spot exactly balanced between Earth's pull and the Sun's pull, so a satellite there barely needs fuel to stay put, watching the Sun non-stop like a security camera that never needs repositioning.

Gaganyaan is ISRO's upcoming human spaceflight programme, intended to send Indian astronauts (called vyomanauts) into low Earth orbit using an Indian-made launch vehicle and capsule. Uncrewed test flights are being carried out ahead of the eventual crewed mission; this is India's step toward becoming only the fourth nation with independent human spaceflight capability, after the USA, Russia, and China.

NISAR (NASA-ISRO Synthetic Aperture Radar) is a joint mission between ISRO and NASA, designed to monitor Earth's surface changes — glaciers, forests, earthquakes, and land subsidence — with radar imaging capable of working through cloud cover and darkness. It represents one of the largest collaborative satellite projects ISRO has undertaken with another space agency.

Exam trap: Do not mix up mission types. A lunar mission (Chandrayaan series) goes to the Moon; a solar mission (Aditya-L1) observes the Sun from a fixed point without landing on it; NISAR is an Earth observation satellite, not an interplanetary mission at all.

Memory hook: Use C-A-G-N in the order these missions matter to you as an aspirant — Chandrayaan (Moon), Aditya (Sun), Gaganyaan (humans to orbit), NISAR (watching Earth itself) — a story chain moving your attention from the Moon, to the Sun, to humans, and finally back home to Earth.

India also continues to grow its satellite launch business through NewSpace India Limited (NSIL), the commercial arm of the Department of Space, which markets India's launch vehicles (PSLV, LVM3) to international customers, and the PSLV (Polar Satellite Launch Vehicle) remains ISRO's most reliable and frequently used workhorse rocket, having carried out well over 50 successful launches across its operational history.

2. Biotechnology Developments

Biotechnology uses living organisms or their components to develop products and processes, and India's biotech sector has grown rapidly across agriculture, healthcare, and industrial applications.

Genome sequencing work has expanded significantly in India through projects mapping genetic diversity across Indian populations, aimed at building a reference genome dataset useful for disease research and precision medicine tailored to Indian genetic backgrounds, since most global reference genome data historically came from Western populations.

CRISPR gene-editing technology, a precise tool for cutting and modifying DNA at exact locations, continues to see growing application in Indian agricultural and medical research, including work on developing disease-resistant crop varieties and exploring treatments for genetic blood disorders. Unlike older genetic modification methods that inserted foreign genes somewhat imprecisely, CRISPR works like an accurate pair of molecular scissors, cutting DNA at a chosen address rather than dropping new material in at random.

Vaccine development capacity, sharply scaled up during the COVID-19 pandemic response through indigenous vaccines like Covaxin (developed by Bharat Biotech in collaboration with the Indian Council of Medical Research), has since been redirected toward other diseases, positioning India as a major global vaccine manufacturing hub — India is often called the "pharmacy of the world" for supplying a large share of globally used vaccine doses.

Biotechnology has also strengthened Indian agriculture through genetically modified (GM) crop research, tissue culture techniques for producing disease-free planting material at scale, and biofertilizer development that reduces dependence on chemical fertilizers by using beneficial soil microorganisms instead.

The Department of Biotechnology (DBT), under the Ministry of Science and Technology, remains the nodal government body coordinating biotech research funding and policy in India, and it oversees institutions and missions supporting this entire sector.

3. Renewable Energy

India has committed to ambitious renewable energy targets as part of its climate commitments, aiming to reach 500 gigawatts of non-fossil fuel-based installed electricity capacity and to meet roughly 50% of its energy requirements from renewable sources, both targeted around 2030, as announced at international climate forums including COP26 in Glasgow.

Solar energy remains India's fastest-growing renewable segment, backed by large solar parks and rooftop solar schemes. The International Solar Alliance (ISA), headquartered in Gurugram, India, was jointly launched by India and France in 2015 to promote solar energy adoption among sun-rich countries, particularly in the developing world, and it now counts over a hundred member countries.

The PM Surya Ghar: Muft Bijli Yojana scheme aims to install rooftop solar panels on households across India, offering subsidies to reduce electricity bills and expand distributed solar generation directly at the consumer level rather than relying only on large centralised solar parks.

Green hydrogen has emerged as a major policy focus through the National Green Hydrogen Mission, approved in 2023, aiming to make India a global hub for producing and exporting green hydrogen — hydrogen generated using renewable electricity to split water, rather than hydrogen produced from fossil fuels, which is why it is called "green." This matters because hydrogen can fuel heavy industries and transport sectors that are hard to electrify directly, like steel-making and long-haul shipping.

Picture India's renewable strategy as diversifying a farmer's crops instead of depending on a single monsoon-fed field: solar captures daytime sun, wind captures coastal and hill breezes, green hydrogen stores that captured energy for later industrial use, all reducing dependence on any single unreliable source — in this case, imported fossil fuel.

Wind energy also contributes significantly to India's renewable mix, with Tamil Nadu, Gujarat, and Rajasthan among the leading wind-power states, and India ranks among the top few countries globally by total installed wind capacity.

India has also pushed hybrid renewable parks that combine solar and wind generation at the same site, since wind tends to peak in different seasons and hours than solar, smoothing out the overall power supply the way a household budget balances a salaried income against seasonal freelance work, neither alone being fully reliable but together covering most gaps. Large hybrid and solar parks in Rajasthan and Gujarat, including some of the world's largest single-site solar installations, anchor much of this capacity expansion. Battery energy storage systems (BESS) are increasingly paired with these parks to store daytime solar generation for evening use, addressing renewable energy's core limitation: it depends on weather and time of day, unlike a coal plant that can run continuously on demand.

4A. Artificial Intelligence and Digital Infrastructure

India's technology policy conversation has widened beyond telecom hardware into artificial intelligence (AI) governance and adoption. The IndiaAI Mission, approved by the Union Cabinet, aims to build domestic AI computing capacity, support Indian-language AI models, and fund AI applications in healthcare, agriculture, and governance, recognising that most global large language models are trained primarily on English and a handful of other major languages, leaving a gap for India's many regional languages.

Digital Public Infrastructure (DPI) is a term increasingly tested in current-affairs sections, referring to foundational digital systems built as public utilities rather than owned by any single private company. India's Aadhaar (biometric identity), UPI (Unified Payments Interface, for instant bank-to-bank digital payments), and DigiLocker (digital document storage) together form what is often called the "India Stack," a model several other countries have studied and sought to replicate for their own digital governance systems. UPI alone processes billions of transactions monthly, and its scale has made India a global reference point for real-time digital payment systems, a fact competitive exams increasingly test given its economic significance.

4. Telecommunications — 5G and Beyond

5G (fifth-generation) mobile network technology was commercially rolled out across India starting October 2022, offering substantially higher data speeds, lower latency (the delay between sending and receiving data), and greater device-connection density compared to 4G. This matters for exam purposes because 5G enables applications that 4G could not reliably support: real-time remote surgery assistance, large-scale IoT (Internet of Things) device networks, and high-quality video streaming without buffering even in crowded areas.

Two major private telecom operators, Reliance Jio and Bharti Airtel, led India's 5G rollout, alongside state-run BSNL working on its own indigenous 4G and 5G stack development, an effort significant because it reduces India's dependence on foreign telecom equipment vendors for critical network infrastructure.

Exam trap: Do not confuse 5G's core advantage. It is not simply "faster downloads" in isolation — the exam-relevant distinguishing features are lower latency and higher device density support, which is what makes technologies like autonomous vehicles and massive IoT sensor networks practically possible.

India's telecom regulator, the Telecom Regulatory Authority of India (TRAI), continues to oversee tariff regulation, spectrum-related recommendations, and consumer protection in the sector, while the Department of Telecommunications (DoT) under the Ministry of Communications handles licensing and policy.

BharatNet, the government's programme to extend broadband internet connectivity to every village panchayat in the country through optical fibre, continues to expand, aiming to close the urban-rural digital divide that otherwise leaves rural students and small businesses without reliable internet access.

5. Notable Scientific Achievements by India

Beyond space and telecom, India has recorded a range of scientific milestones worth remembering for the exam.

India operates one of the world's most extensive vaccine manufacturing bases, with the Serum Institute of India, based in Pune, recognised as the world's largest vaccine manufacturer by number of doses produced, supplying vaccines to over a hundred countries.

In supercomputing, India's National Supercomputing Mission, jointly run by the Department of Science and Technology and the Department of Electronics and Information Technology, continues to expand the country's high-performance computing capacity through systems like PARAM series supercomputers, supporting research in weather modelling, drug discovery, and defence applications.

India's nuclear energy programme continues expanding through indigenously designed Pressurised Heavy Water Reactors (PHWRs), and cooperation on larger reactor projects continues at sites like Kudankulam in Tamil Nadu, run under the oversight of the Nuclear Power Corporation of India Limited (NPCIL).

The Council of Scientific and Industrial Research (CSIR), with its network of national laboratories spread across the country, remains India's largest publicly funded industrial research organisation, running work across fields from pharmaceuticals to aerospace materials to food technology.

Think of CSIR's laboratory network like a large joint family with each branch specialising in a different trade — one lab focused on drugs, another on fuels, another on structural materials — all reporting back to the same central household, pooling knowledge rather than duplicating it.

6. Awards in Science

Recognising scientific talent forms a recurring exam theme, so know these clearly.

The Shanti Swarup Bhatnagar Prize, administered by CSIR, is India's most prestigious science award for Indian scientists working within the country, given annually across categories including physics, chemistry, biology, mathematics, medicine, engineering, and earth/atmosphere/ocean/planetary sciences, honouring notable contributions by scientists typically under 45 years of age.

The Padma awards (Padma Vibhushan, Padma Bhushan, Padma Shri), India's civilian honours, regularly recognise outstanding scientists among their broader list of honourees across public life, and question-setters sometimes test which scientist received which specific Padma award in a given year.

Internationally, the Nobel Prize in Physics, Chemistry, and Physiology or Medicine remains the most prestigious global science recognition, and while few Indian-origin scientists have won in recent decades working from Indian institutions directly, scientists of Indian origin working abroad, such as physicist Venkatraman Ramakrishnan (Chemistry, 2009, for ribosome structure studies) and Abhijit Banerjee (Economic Sciences, 2019, alongside co-recipients, for experimental approaches to alleviating global poverty), continue to be relevant exam names, since exams frequently test "scientist of Indian origin who won a Nobel Prize" as a factual recall question.

India's own Infosys Prize, funded privately, recognises outstanding research contributions by scientists and researchers working in India across categories including engineering, life sciences, mathematical sciences, physical sciences, social sciences, and humanities, and has become a well-regarded domestic science recognition alongside government awards.

Exam trap: A frequent trick question separates "scientist born in India" from "scientist of Indian origin working abroad" — read award-related questions carefully for exactly which category and nationality condition is being tested, since these details change the correct answer entirely.

The G. D. Birla Award for Scientific Research and the Kalinga Prize for the Popularisation of Science, the latter administered internationally through UNESCO, are two further science honours that occasionally appear in objective papers, the Kalinga Prize being notable because it specifically rewards scientists who make technical knowledge accessible to ordinary readers, not just those who produce original research. Remembering this distinction, research achievement versus science communication, helps you eliminate wrong options quickly when a question describes what an award actually honours rather than just naming it.

Railway and government exams also occasionally test India's defence-science achievements, since the Defence Research and Development Organisation (DRDO) overlaps with the broader science and technology theme. DRDO has developed indigenous missile systems under the Agni and Prithvi series, along with the Tejas light combat aircraft programme, run jointly with Hindustan Aeronautics Limited (HAL). These programmes matter for General Awareness because they represent India's push toward self-reliance in defence manufacturing, a policy theme frequently linked in exam passages to the broader Atmanirbhar Bharat initiative, which encourages domestic production across strategic sectors including defence, electronics, and pharmaceuticals rather than dependence on imports.

Keep one clear takeaway from this whole chapter: current science and technology questions reward readers who track why a mission or policy exists, not just its name. A name alone is easy to forget under exam pressure; a purpose sticks, because purposes connect to things you already understand, like a parking spot that saves fuel, or scissors that cut precisely instead of tearing roughly.

Quick Revision — One-Line Facts

• Chandrayaan-3 achieved a soft landing near the Moon's south pole on 23 August 2023, aboard the LVM3 rocket.
• India is the fourth country to achieve a controlled lunar landing and the first near the lunar south pole.
• Chandrayaan-3's lander is Vikram and its rover is Pragyan.
• 23 August is observed as National Space Day in India.
• Chandrayaan-2's lander crashed in 2019, but its orbiter continues functioning.
• Aditya-L1 is India's first dedicated solar observation mission, positioned at Lagrange Point 1.
• Gaganyaan is ISRO's planned human spaceflight programme; Indian astronauts will be called vyomanauts.
• NISAR is a joint ISRO-NASA Earth-observation radar satellite mission.
• PSLV is ISRO's most frequently used and reliable launch vehicle.
• NSIL is the commercial arm of India's Department of Space.
• CRISPR is a precise gene-editing tool that cuts DNA at exact locations.
• Covaxin was developed by Bharat Biotech with the Indian Council of Medical Research.
• The Department of Biotechnology is the nodal body for India's biotech policy and funding.
• India targets 500 GW of non-fossil fuel electricity capacity, broadly by around 2030.
• The International Solar Alliance, headquartered in Gurugram, was launched by India and France in 2015.
• PM Surya Ghar: Muft Bijli Yojana promotes rooftop solar installation with subsidies.
• The National Green Hydrogen Mission was approved in 2023 to make India a green hydrogen export hub.
• India commercially rolled out 5G services starting October 2022.
• 5G's key advantages over 4G are lower latency and higher device-connection density.
• TRAI regulates telecom tariffs and consumer protection; DoT handles licensing and policy.
• BharatNet aims to extend optical fibre broadband to every village panchayat.
• Serum Institute of India, based in Pune, is the world's largest vaccine manufacturer by dose volume.
• The National Supercomputing Mission runs India's PARAM series of supercomputers.
• NPCIL oversees India's nuclear power plants, including Kudankulam in Tamil Nadu.
• CSIR is India's largest publicly funded industrial research organisation.
• The Shanti Swarup Bhatnagar Prize is India's top science award, administered by CSIR.
• Venkatraman Ramakrishnan, of Indian origin, won the Nobel Prize in Chemistry in 2009 for ribosome research.
• Abhijit Banerjee, born in India, won the Nobel Prize in Economic Sciences in 2019.
• The Infosys Prize is a privately funded award recognising research across multiple scientific disciplines in India.
• ISRO is headquartered in Bengaluru and functions as India's nodal space agency.

Memory Tables

Table 1: ISRO's Key Recent Missions

Mission	Target	Key achievement	Notable component
Chandrayaan-3	Moon (south pole)	Soft landing, 23 Aug 2023	Lander Vikram, rover Pragyan
Aditya-L1	Sun (from L1 point)	Continuous solar observation	Positioned at Lagrange Point 1
Gaganyaan	Low Earth orbit	Human spaceflight programme	Crew called vyomanauts
NISAR	Earth	Radar-based surface monitoring	Joint ISRO-NASA mission

Table 2: Regulatory and Nodal Bodies

Body	Sector	Key role
TRAI	Telecom	Tariff regulation, consumer protection
DoT	Telecom	Licensing and policy
DBT	Biotechnology	Research funding and policy
CSIR	Science and industrial research	Runs national laboratory network
NPCIL	Nuclear power	Operates nuclear power plants

Table 3: Notable Science Awards

Award	Administered by	Recognises
Shanti Swarup Bhatnagar Prize	CSIR	Scientists in India, typically under 45
Padma awards	Government of India	Outstanding contributions across public life
Infosys Prize	Infosys Science Foundation	Research across multiple scientific fields in India
Nobel Prize	Nobel Foundation, Sweden/Norway	Global recognition across sciences and other fields

Practice MCQs

Q1. On which date did Chandrayaan-3 achieve its soft landing near the Moon's south pole? (a) 15 August 2023 (b) 23 August 2023 (c) 23 July 2023 (d) 5 September 2023

Q2. What are Chandrayaan-3's lander and rover named respectively? (a) Vikram and Pragyan (b) Pragyan and Vikram (c) Aryabhata and Vikram (d) Vikram and Aryabhata

Q3. Aditya-L1 is positioned at which point to continuously observe the Sun? (a) Geostationary orbit (b) Lagrange Point 1 (c) Low Earth orbit (d) Lunar orbit

Q4. What term is used for Indian astronauts under the Gaganyaan programme? (a) Cosmonauts (b) Taikonauts (c) Vyomanauts (d) Astronauts

Q5. NISAR is a joint satellite mission between ISRO and which other space agency? (a) ESA (b) NASA (c) Roscosmos (d) JAXA

Q6. Which technology is described as a precise molecular tool for cutting and editing DNA at exact locations? (a) PCR (b) CRISPR (c) ELISA (d) MRI

Q7. Covaxin was developed by Bharat Biotech in collaboration with which organisation? (a) DRDO (b) ICMR (c) CSIR (d) AIIMS

Q8. The International Solar Alliance, launched jointly by India and France, is headquartered in which city? (a) New Delhi (b) Gurugram (c) Ahmedabad (d) Chennai

Q9. India's National Green Hydrogen Mission was approved in which year? (a) 2021 (b) 2022 (c) 2023 (d) 2024

Q10. In which month and year did India commercially roll out 5G mobile network services? (a) October 2022 (b) January 2022 (c) October 2021 (d) October 2023

Q11. What are the two key exam-relevant advantages of 5G technology over 4G? (a) Larger screen size and battery life (b) Lower latency and higher device-connection density (c) Lower cost and wider coverage only (d) Better call quality only

Q12. Which organisation is recognised as the world's largest vaccine manufacturer by dose volume, based in Pune? (a) Bharat Biotech (b) Serum Institute of India (c) Panacea Biotec (d) Cadila Healthcare

Q13. The Shanti Swarup Bhatnagar Prize, India's top science award, is administered by which organisation? (a) DBT (b) CSIR (c) DRDO (d) ISRO

Q14. Venkatraman Ramakrishnan, a scientist of Indian origin, won the Nobel Prize in which field for his ribosome research? (a) Physics (b) Chemistry (c) Physiology or Medicine (d) Economic Sciences

Q15. What was the key difference between Chandrayaan-2 and Chandrayaan-3 missions? (a) Chandrayaan-3 carried no lander at all (b) Chandrayaan-2's lander crashed, while Chandrayaan-3 achieved a successful landing (c) Chandrayaan-2 landed near the south pole, Chandrayaan-3 did not (d) Chandrayaan-3 used a foreign rocket while Chandrayaan-2 used LVM3

Answer Key

Q	Answer	Reason
1	(b)	Chandrayaan-3 landed on 23 August 2023, a date now marked as National Space Day.
2	(a)	Vikram is the lander, named after Vikram Sarabhai; Pragyan is the rover.
3	(b)	Lagrange Point 1 lets Aditya-L1 observe the Sun continuously without eclipse interruption.
4	(c)	India's astronaut term for Gaganyaan crew is vyomanaut, distinct from cosmonaut or taikonaut.
5	(b)	NISAR pairs ISRO with NASA for joint Earth-surface radar monitoring.
6	(b)	CRISPR acts like precise molecular scissors, editing DNA at a chosen location.
7	(b)	Bharat Biotech developed Covaxin jointly with the Indian Council of Medical Research.
8	(b)	The International Solar Alliance is headquartered in Gurugram, India.
9	(c)	The National Green Hydrogen Mission received approval in 2023.
10	(a)	India's commercial 5G rollout began in October 2022, led by Jio and Airtel.
11	(b)	Lower latency and greater device density, not just raw speed, define 5G's practical edge.
12	(b)	Serum Institute of India, Pune, leads globally by vaccine dose volume produced.
13	(b)	CSIR administers the Bhatnagar Prize, India's foremost domestic science honour.
14	(b)	Ramakrishnan shared the 2009 Chemistry Nobel for work on ribosome structure.
15	(b)	Chandrayaan-2's 2019 lander crashed on descent; Chandrayaan-3 corrected this and landed safely in 2023.