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A white solid (A) is either Na(2)O or Na...

A white solid (A) is either `Na_(2)O` or `Na_(2)O_(2)`.
a. A piece of red litmus paper turns white when it is dipped into a freshly made aqueous solution of the white solid.
b. Explain what would happen to the red litmus if the white solid were the other compound.

Text Solution

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a. `Na_(2)O` and `Na_(2)O_(2)`, when dissolved in water give `Na_(2)O+H_(2O rarr 2NaOh`
`Na_(2)O_(2)+2H_(2)O rarr 2NaOH+H_(2)O_(2)`
A piece of litmus paper truns white when it is dipped into a freshyl made aqueous solution of compoud (A), due to bleaching action of `H_(2)O_(2)`, thus compound (A) is `Na_(2)O_(2)`, i.e., sodium peroxide.
b. If white solid was `Na_(2)O`, the red litmus paper will trun blue due to the strong alkaline nature of the solution. `Na_(2)O+H_(2)O rarr 2NaOH`
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