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Why does dry HCl gas not change the colo...

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

Text Solution

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Colour of the litmus paper is changed by the hydrogen ions. Dry HCl gas does not contain `H^(+)` ions. It is only in the aqueous solution that an acid dissociates to give ions. Since in this case, neither HCl is in the aqueous form nor the litmus paper is wet, therefore, the colour of the litmus paper does not change.
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Knowledge Check

  • Assertion (A): Hydrogen chloride gas does not change the colour of dry blue litmus paper. Reason (R): Hydrogen chloride gas dissolves in the water present in wet litmus paper to form H^(+) ions.

    A
    Both A and R are true, and R is the correct explanation of A.
    B
    Both A and Rare true, but is not the correct explanation of A.
    C
    A is true but R is false.
    D
    A is false but R is true.

  • A gas 'X' when passed through blue litmus solution turn it red. Another gas 'Y' when passed through either blue litmus or red litmus does not change the colour of the litmus. Identigy the trun statement regarding X and Y.

    A
    X is basic while Y is neutral.
    B
    Y is neutral while X is acidic.
    C
    Y is basic while X is acidic.
    D
    Y is acidic while X is neutral.

  • A gas X when passed through blue litmus solution turns it red. Another gas Y when through either blue litmus or red litmus does not change the colour of the litmus. Identigy the true statement regarding X and Y.

    A
    X is basic while Y is neutral.
    B
    Y is neutral while X is acidic.
    C
    Y is basic while X is acidic.
    D
    Y is acidic while X is neutral.

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    (a). What is produced if an acid is added to a base? (b). Why does dry HCl gas not change the colour of dry litmus paper? (c). What colour does phenolphthalein indicator tum when added to an alkali (such as sodium hydroxide)?

    Dry hydrogen chloride gas does not change the colour of dry litmus paper. Why?

    What are olfactory indicators ? Dry HCl gas does not change the colour of dry blur litmus. Give reasons.

    A gas: X when passed through blue litmus solution turns it to red. Another gas Y when passed through either blue litmus or red litmus does not change the colour of the litmus. Identify the true statement regarding X and Y.

    A gas X when passed through blue litmus solution turns it to red. Another gas Y when passed through either blue litmus or red litmus does not change the colour of the litmus. Identify the true statement regarding X and Y.

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