BPSC 68th Prelims Exam 12 Feb 2023 Solved Paper

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Question : 23 of 150

Marks: +1, -0

Why does dry HCI gas not change the colour of dry litmus paper?

HCI gas acts as a dehydrating agent.
Blue litmus becomes dry in the presence of dry HCI gas.
No H3O+ ions are present. Litmus changes colour only in the presence of H3O+ ions.
More than one of the above
None of the above

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