When an element M and its oxide reacted with HCl following reactions were observed. Based on the given reactions and observation choose the incorrect statement regarding M, A, and X.
$M + H C l (a q) \to M C l_{2} (a q) + A_{2} M O_{2} (s) + H C l (a q) \to M C l_{2} (a q) + H_{2} O (l) + X_{2} (g)$
Observation: Matchstick starts to burn with a pop sound when brought near $A_{2}$ gas.

M is a metal, A and X are nonmetals.

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M is Cu, A is H, X is Cl

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M is above hydrogen in the reactivity series.

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X_{2}

gas has a pungent choking odour.

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Solution

The correct option is B M is Cu, A is H, X is Cl

It’s given in the observation that Matchstick starts to burn with a pop sound when brought near $A_{2}$ gas. So, definitely it is $H_{2}$ gas.

when metal reacts with $H C l$ , $H_{2}$ gas is evolved. So M is metal as it gives $H_{2}$ gas when it reacts with $H C l$ .

When metal oxide reacts with $H C l$ it gives $C l_{2}$ gas.so, X is $C l_{2}$ gas.

A is $H_{2}$ , X is $C l_{2}$ gas and M is a metal.

In option A it is given that M is metal and A and X are non metal. Its true.

M is above hydrogen that’s why $H_{2}$ gas is evolved when M reacts with $H C l$ .

X is $C l_{2}$ gas. And $C l_{2}$ has a pungent choking odour.

So, except option B every option is correct.

So the answer is option B.

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