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Preparation of Chlorine

Small pieces ...

Question

Small pieces of steel and some powdered rust are taken in two test tubes A and B respectively. When concentrated hydrochloric acid is pured into both the test tubes, a colourless gas is evolved on test tube(s):

A

A

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B

B

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C

Both A and B

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D

neither in A nor in B

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Solution

The correct option is A A
Corrosion of steel takes place in the presence of $H C l$ in the test tube A.

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