21.

Assertion : H₂O₂ has higher boiling point than water.

Reason : H₂O₂ has stronger dipole-dipole interactions than that shown by water.

• 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 : BeSO₄ is soluble in water while BasO₄ is not.

Reason : Hydration energy decreases down the group from Be to Ba and lattice energy remains almost constant.

• 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: Saturated hydrocarbons are chemically less reactive.

Reason : All isomeric paraffins have same parent name.

• 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 : CN^- ion is an ambident nucleophile.

Reason: Nucleophiles are electron rich species.

• 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: Conductivity of silicon increases by doping it with group-15 elements.

Reason : Doping means introduction of small amount of impurities like P, As or Bi into the pure crystal.

• 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.

Copper sulphate is dissolved in water containing ________ for making Bordeaux mixture.

• NaOH

• KCN

• Ca(OH)₂

• All of these

Which of the following is an amorphous solid?

• Iron

• Graphite

• Diamond

• Glass

The diamagnetic species is

• [Ni(CN)₄]^2-

• [Ni(Cl)₄]^2-

• [CoCl]^2-

• [CoF₆]^3-

What happens when chloroform is left open in air in the presence of sunlight?

• Explosion takes place

• Phosgene, a poisonous gas is formed.

• Polymerisation takes place.

• No reaction takes place.

The Ca²⁺ and F^- are located in CaF₂ crystal respectively at face-centred cubic lattice points and in

• tetrahedral voids

• half of tetrahedral voids

• octahedral voids

• half of octahedral voids