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| Q.20 | निम्नलिखित में से कौन-सी अशुद्ध धातुओं के शोधन के लिए सर्वाधिक व्यापक रूप से उपयोग की जाने वाली विधि है? | |
| Ans | 1. विद्युत-अपघटनी परिष्करण (Electrolytic Refining) | |
| 2. वाष्प प्रावस्था परिष्करण (Vapour-Phase Refining) | ||
| 3. दंड-विलोडन परिष्करण (Poling Refining) | ||
| 4. द्रवीकरण परिष्करण (Liquidation Refining) |
Correct Ans Provided: 1
