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Byju's Answer

Standard VIII

Chemistry

Reaction of Metals with Acid

Arun dropped ...

Question

Arun dropped aluminium foil in a test tube containing solution of sodium hydroxide. He observed bringing a burning matchstick near the mouth of the test tube the matchstick extinguishes with a pop sound. What do you think made the pop sound?

Evolution of carbon dioxide gas

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Evolution of hydrogen gas

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Formation of precipitate

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Evolution of oxygen

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Solution

The correct option is B Evolution of hydrogen gas
The ‘pop’ sound indicates the presence of hydrogen gas. Metals react with bases to produce hydrogen gas. Sodium aluminate(salt) and hydrogen gas are formed when sodium hydroxide(base) reacts with aluminium metal.
Metals + Base(NaOH) $\to$ Salt + Hydrogen gas

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