RRB NTPC CBT-1 previous year question
Why does iron replace copper when an iron nail is dipped in copper sulphate solution?
Asked in RRB NTPC 2026 — 14 June Shift 1 · General Awareness
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Correct answer: (D) Iron is more reactive
In the reactivity series, iron is more reactive than copper, so it displaces copper from copper sulphate solution, forming iron sulphate and depositing copper metal on the nail.
हिंदी में प्रश्न
पर्वतीय क्षेत्रों में आकार की घाटियों के निर्माण में मुख्य रूप से कौन-सी प्रक्रिया मदद करती है?
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (D) तरंग िक्रया
अभिक्रियाशीलता श्रेणी में, लोहा तांबे से अधिक अभिक्रियाशील है, इसलिए यह कॉपर सल्फेट विलयन से तांबे को विस्थापित कर देता है, जिससे आयरन सल्फेट बनता है और कील पर तांबा जमा होता है।
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