Equal lengths of magnesium ribbons are taken in test tubes A and B. HCl is added to the test tube A while acetic acid is added to test tube B. In which test tube will the fizzing occur more vigorously?

Test tube A

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Test tube B

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Both of the test-tube A and B

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None of the test tubes

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Solution

The correct option is A
Test tube A

HCl is a strong acid whereas acetic acid is a weak acid. Being a strong acid, the hydrochloric acid solution contains a much greater amount of hydrogen ions in it due to which the fizzing will occur more vigorously in test tube A (containing hydrochloric acid). The fizzing is due to the evolution of hydrogen gas which is formed by the action of acid on the magnesium metal.

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