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There is no change in the colour of red ...

There is no change in the colour of red litmus and blue litmus paper when introduced into an aqueous solution of sodium chloride. After passing direct current through the same solution, red litmus changes to blue colour. Which product is responsible for this change ? Mention any two uses of this product.

Text Solution

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There is no change in the colour of red litmus and blue litmus paper when introduced into an aqueous solution of sodium chloride because sodium chloride is neutral in nature. If electric current is passed through aqueous solution of NaCL then the products are sodium hydroxide, chlorine and Hydrogen.
`2NaCl (aq) + 2H_(2)O(l) rarr 2NaOH(aq) + Cl_(2)(g) + H_(2)(g)`
Since sodium hydroxide is basic in nature, red litmus turns blue. Uses of Sodium hydroxide :
(i) Used in preparation of soaps and detergents.
(ii) Used in manufacture of paper.
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There is no change in the colour of red litmus and blue lit mus paper when introduced into an aqucous solution of sodium chloride. A fter passing direct current through the same solution, red litmus ehanges to blue colour. Which product is responsible for this change? Mention any two uses of this produet.

There is no change in the colour of red litmus and blue lit mus paper when introduced into an aqucous solution of sodium chloride. A fter passing direct current through the same solution, red litmus ehanges to blue colour. Which product is responsible for this change? Mention any two uses of this produet.

Knowledge Check

  • The solution of which oxide among the following turns blue litmus red?

    A
    `MgO`
    B
    `Na_(2)O`
    C
    `CO`
    D
    `SO_(3)`

  • Aqueous solution of CuSO_(4).5H_(2)O changes blue litmus paper red due to

    A
    Hydrolysis of `Cu^(2+)` ion
    B
    Reduction taking place
    C
    Presence of `Cu^(2+)` ions
    D
    Presence of `SO_(4)^(2-)` ions

  • An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change ?

    A
    Baking powder
    B
    Lime
    C
    Ammonium hydroxide solution
    D
    Hydrochloric acid

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