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

C a C O_{3} + H_{2} S O_{4} \to

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C u + H C l \to

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K + H C l \to

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N a O H + H_{2} S O_{4} \to

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Solution

The correct option is C $K + H C l \to$
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, so potassium releases hydrogen gas upon reaction with HCl. Copper is below hydrogen, so Cu does not react to give hydrogen gas. The other reactions do not liberate hydrogen.
$K + H C l \to K C l + H_{2}$

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