A metal X forms a water-soluble salt XNO3. When an aqueous solution of XNO3 is added to a common salt solution, a white precipitate of compound Y is formed along with sodium nitrate solution. Metal X is said to be the best conductor of electricity, and it does not evolve hydrogen when put in dilute hydrochloric acid. Which of the following is the metal X?

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Silver

Iron

Aluminium

Magnesium

answer is A.

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Detailed Solution

A metal X forms a water-soluble salt XNO3. When an aqueous solution of XNO3 is added to a common salt solution, a white precipitate of compound Y is formed along with sodium nitrate solution. Metal X is said to be the best conductor of electricity, and it does not evolve hydrogen when put in dilute hydrochloric acid. The metal X must be silver (Ag).
Ag is the best conductor of electricity. Silver also is less reactive than hydrogen and is placed lower than hydrogen in the reactivity series, so it does not displace H2 from dilute hydrochloric acid. Hence H2 is not evolved.

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