RRB NTPC CBT-1 previous year question
In a laboratory, copper sulphate solution reacts with iron filings, causing a colour change and the deposition of a new metal. Which statement correctly explains the reason for this reaction?
Asked in RRB NTPC 2026 — 15 June Shift 2 · General Awareness
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Correct answer: (D) Iron is more reactive than copper
Iron is more reactive than copper in the reactivity series, so it displaces copper from copper sulphate solution, forming iron sulphate and depositing reddish-brown copper metal, which also causes the blue colour to fade.
हिंदी में प्रश्न
उस्ताद बिस्मिललाह खान का सबसे निकट संबंध किस वाद्य यंत्र से था?
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सही उत्तर: (D) सितार
सक्रियता श्रेणी में लोहा तांबे से अधिक क्रियाशील है, इसलिए यह कॉपर सल्फेट विलयन से तांबे को विस्थापित कर देता है, आयरन सल्फेट बनाता है और लाल-भूरे तांबे धातु का जमाव करता है, जिससे नीला रंग भी फीका पड़ जाता है।
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