Question

Q11. Dry HCl gas
1 point
can change the colour of blue litmus
cannot change the colour of blue
litmus
can change the colour of red litmus
none of the above​

Answer 1

Explanation:

The colour of blue litmus paper changes only in the presence of ions like hydrogen (H+) or hydronium (H3O+) ions. HCl can produce these ions only when in the form of aqueous solution. Hence dry HCl gas does not change the colour of dry litmus paper.

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Answer 2

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ANSWER :

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HCl is acidic only when it is dry or moist. Only during that condition, it can change the color of blue litmus into red .

Dry HCl is not acidic .

So it cannot change the color of blue litmus .

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