The number of S - S bonds in sulphur trioxide trimer (S₃O₉) is

• three

• two

• one

• zero

XeF₆ on complete hydrolysis produces

• XeOF₄

• XeO₂F₂

• XeO₃

• XeO₂

Which acid has P - P linkage?

• Hypophosphoric acid

• Pyrophosphoric acid

• Metaphosphoric acid

• Orthophosphoric acid

Which statement is wrong for NO ?

• It is anhydride of nitrous acid

• Its dipole moment is 0.22 D

• It forms dimer

• It is paramagnetic

There is no S-S bond in :

• S₂O₄^2-

• S₂O₅^2-

• S₂O₃^2-

• S₂O₇^2-

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 : 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.

1248.

Assertion : Ozone is an allotrope of oxygen.

Reason : Oxygen is bluish colour liquid and in singlet state it is more paramagnetic.

• 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 : SnI₄ is an orange solid.

Reason : The colour arises due to charge transfer.

• 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.

Oxidation number of sulphur in H₂S₂O₈ is :

• +6

• +8

• +21

• +7