Question

Why dry HCL doesn't change the colour of dry Litmus Paper

Answer 1

because hcl require water to change the colour. so hcl doesn't change the colour on 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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