31.

The purification of alumina is called

• Baeyer's process

• Bosch process

• Castuer process

• Hoop's process.

Which acid has P - P linkage?

• Hypophosphoric acid

• Pyrophosphoric acid

• Metaphosphoric acid

• Orthophosphoric acid

Assertion : Bleaching powder reacts with dilute acids to evolve chlorine.

Reason : The chlorine liberated by the action of dilute acids on bleaching powder is called available chlorine.

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

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

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion : In high spin situation, configuration
of d⁵ ions will be ${\mathrm{t}}_{2\mathrm{g}}^3, {\mathrm{e}}_{\mathrm{g}}^2$.

Reason : In high spin situation, pairing energy is less than crystal field energy.

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

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

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion : When a concentrated solution is diluted by adding more water, molarity of the solution remains unchanged.

Reason : Product of moles of a solute and volume is equal to the molarity.

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

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

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion : Liquid NH₃,is used for refrigeration.

Reason : Liquid NH₃ quickly vapourises.

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

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

• If assertion is true but reason is false.

• If both assertion and reason are false.

Identify Z in the reaction.

Toluene is nitrated and the resulting product is reduced with tin and hydrochloric acid. The product so obtained is diazotised and thenheated with cuprous bromide. The reaction mixture so formed contains

• mixture of o- and m-bromotoluenes

• mixture of o- and p-bromotoluenes

• mixture of o- and p-dibromobenzenes

• mixture of o- and p-bromoanilines

CH₃CH=CHCH₃ + CHCl₃ + t-BuOK ➔ A. A is

In which of the following preparations of ether, the configuration about chiral centre is not retained?