RRB Technician Grade 3 previous year question
Which of the following methods is commonly used to extract metals low in the activity series, such as mercury and copper, from their ores?
Asked in RRB Technician Grade 3 (10 Mar 2026 Shift 1) · Science
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Correct answer: (C) Roasting
Metals low in the reactivity series, such as mercury and copper, have oxides that decompose easily on heating alone, so these metals are commonly extracted simply by roasting (heating in air), without needing a stronger reducing agent.
हिंदी में प्रश्न
निम्नलिखित में से कौन-सी विधि सक्रियता श्रेणी में नीचे आने वाली मरकरी और कॉपर जैसी धातुओं को उनके अयस्क से निष्कर्षित करने के लिए सामान्यतः उपयोग की जाती है?
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (C) भर्जन
पारा और तांबे जैसी अभिक्रियाशीलता श्रेणी में नीचे स्थित धातुओं के ऑक्साइड केवल गर्म करने पर ही आसानी से विघटित हो जाते हैं, इसलिए इन धातुओं को सामान्यतः केवल भर्जन (हवा में गर्म करना) द्वारा निष्कर्षित किया जाता है।
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