Equal lengths magnesium ribbons are taken in test tubes A and B. Hydrochloric acid () is added to test tube A, while acetic acid () is added to test tube A, while acetic acid () is added to test tube B. Amount and concentration taken for both the acids are the same. In which test tube will the fizzing occur more vigorously?

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Test tube second with acetic acid

Test tube one with hydrochloric acid.

In both test tubes, equal fizzing will occur.

No fizzing will occur

answer is B.

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Detailed Solution

Concept- When an acid reacts with a metal, it will produce a salt and hydrogen gas.
The production of hydrogen gas is responsible for the fizzing sound.
Acetic acid is a weak acid and hydrochloric acid is strong acid. A weak acid does not dissociate completely , thus the extent of reaction of magnesium with weak acid is less than the reaction with strong acid.

Mg + 2 C H_{3} COOH \to Mg (C H_{3} COO)_{2} + H_{2}

Mg + 2 HCl \to MgC l_{2} + H_{2}

In the test tube one magnesium and acetic acid is added and in the test tube second magnesium and hydrochloric acid is added. As the hydrochloric acid is more stronger than acetic acid. So, fizzing occurs more vigorously in the test tube one with hydrochloric acid.
Hence, the correct option is (2).

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