| I. Reactivity of Al decreases if it is dipped in nitric acid. |
| II. Carbon can reduce the oxides of Na and \[Mg\]. |
| III. \[NaCl\] is a good conductor of electricity in solid state. |
| IV. Metals like \[K,\,Ca\] and \[Mg\] are always found in free state in nature. |
A) I, II and III only
B) II, III and IV only
C) I and III only
D) II and III only
Correct Answer: B
Solution :
Al becomes passive if it is dipped in nitric acid due to formation of a protective layer of aluminium oxide. Carbon cannot reduce the oxides of Na or Mg. \[NaCl\] is a good conductor of electricity in molten state or in aqueous solution. Metals like K, Ca and Mg are highly reactive and are never found in free state in nature.
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