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Question

When a piece of aluminium is dropped in HCl and in NaOH separately, and a burning match is brought near them, pop sound is heard in case of .

A
only HCl
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B
only NaOH
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C
both HCl and NaOH
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Solution

The correct option is C both HCl and NaOH
Aluminium reacts with both dilute acids and bases and releases H2 gas.
The reactions taking place are:

2Al+6HCl2AlCl3+3H2

2Al+2NaOH+2H2O2NaAlO2+3H2

Thus, in both the cases H2 gas is released and a pop sound will be heard.

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