Hydrochloric acid reacts with a metal X to form a gas Y which burns with a 'pop' sound. Sodium hydroxide solution also reacts with the same metal X (on heating) to form the same gas Y.
(a) Name X and Y
(b) Write the chemical equation of the reaction of metal X with (i) hydrochloric acid, and (ii) sodium hydroxide solution.

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Solution

(a) X is zinc metal and Gas Y is hydrogen gas.

(b).
(i) Reaction of the metal with hydrochloric acid:

$Z n (s) Z i n c (m e t a l) + 2 H C l H y d r o c h l o r i c a c i d (D i l u t e) \to Z n C l_{2} Z i n c c h l o r i d e (s a l t) + H_{2} (g) H y d r o g e n g a s$

(ii) Reaction of the metal with sodium hydroxide solution.

$2 N a O H (a q) S o d i u m h y d r o x i d e (B a s e) + Z n (s) Z i n c H e a t - -- \to N a_{2} Z n O_{2} (a q) S o d i u m z i n c a t e (s a l t) + H_{2} (g) H y d r o g e n$

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