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Question

Which of these reactions release a gas which burns with a pop sound?

A
CaCO3 + H2SO4
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B
Cu + HCl
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C
K + HCl
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D
NaOH + H2SO4
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Solution

The correct option is C K + HCl
Only metals above hydrogen in the reactivity series react with a dilute acid to form hydrogen gas, which burns with a pop sound.

Potassium is above hydrogen in the reactivity series, so potassium releases hydrogen upon reaction with HCl.
K + HCl KCl+H2

Copper is below hydrogen in the series. So, Cu does not release hydrogen on its reaction with hydrochloric acid.

NaOH is a base which participates in a neutralisation reaction with sulphuric acid to form salt and water.

The reaction between CaCO3 and sulphuric acid produces carbon dioxide gas which doesn't burn. So it can't make a pop sound.

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