What does the pop sound indicate when sodium reacts with cold water?

Release of oxygen

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Release of carbon dioxide

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Both A and B

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Release of hydrogen

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Solution

The correct option is B Release of hydrogen
Sodium metal is very reactive. It reacts vigorously with oxygen and water. A lot of heat is generated in this reaction. Hence, it is stored in kerosene. To test for the release of hydrogen gas, place a lighted splint over the reacting metal - if it "pops" then hydrogen is present.

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