Which of the following metals is used in the thermite welding process? MCQ with Answer and Explanation

Which of the following metals is used in the thermite welding process?
A. Lead
B. Copper
C. Zinc
D. Aluminium
Answer: Option D
Solution (By JKSSB Mock Tests)
Thermite: Fe₂O₃ + 2Al → 2Fe + Al₂O₃. Aluminium powder reduces iron oxide, producing molten iron for welding. Al is chosen due to its high reactivity and exothermic reaction.

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In the molecule BF₃, the type of bonding is:
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Correct Answer: Option C


Explanation:
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Correct Answer: Option C


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The value of the universal gas constant 'R' in SI units is:
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Correct Answer: Option D


Explanation:
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