Sodium hydroxide is manufactured by the...

Sodium hydroxide is manufactured by the

Solvay process

Castner-Kellner process

Leblanc process

Downs process

Text Solution

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The correct Answer is:

Sodium hydroxide is prepared commercially by the electrolysis of an aqueous solution of sodium chlorid using mercury cathode and graphite anode. The electrolysis is carried out in a specially designed vessel called castner Kellner's cell or mercury cathode cell.

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Sodium hydroxide is manufacture by the electrolysis of brine solution. The reaction by - products are :

`Cl_(2)` and `H_(2)`

`Cl_(2)` and `Na-Hg`

`Cl_(2)` and `NaCl`

`Cl_(2)` and `O_(2)`

Assertion : Na_(2)SO_(4) can be used as the starting material for the preparation of sodium carbonate and sodium hydroxide. Reason : Sodium hydroxide is prepared by the treatment of milk of lime with sodium carbonate.

If both assertion and reason are true and the reason is the correct explanation of the assertion.

If both assertion and reason are true but reason is not the correct explanation of the assertion

If assertion is true but reason is false.

If assertion is false but reason is true.

Chemical (X) is used for (i) The production of sodium hydroxide (ii) The manufacture of bleaching powder (iii) For the extraction of magnesium from sea water in the chemical formula of (X)?

`Ca(OH)_(2)`

`CaO`

`Ca(HCO_(3))_(2)`

`CaCO_(3)`