The p-Block Elements

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

Iodine is tested by the following reagent :

• starch

• urea

• glucose

• glycerol

Difference in the melting and boiling points of inert gases is :

• large

• small

• no difference

• any of these

NaOCl is used as a bleaching agent and sterilising agent .It can be synthesized by the action of :

• NaCl with H₂O

• NH₄Cl with NaOH

• Cl₂ with cold and dilute NaOH

• Cl₂ with hot and concentrated NaOH

How can you synthesize nitric oxide in the laboratory ?

• Zinc with cold and dilute HNO₃

• Zinc with concentrated HNO₃

• Copper with cold and dilute HNO₃

• Heating NH₄NO₃

Tincture iodine is

• aqueous solution of I₂

• solution of I₂ in aqueous Kl

• alcoholic solution of I₂

• aqueous solution of Kl.

The compound molecular in nature in gas phase but ionic in solid state is

• PCl₅

• ${\mathrm{CCl}}_4$

• PCl₃

• POCl₃

Which two of the following salts are used for preparing iodized salt?

(i) KIO₃, (ii) KI, (iii) I₂, (iv) HI

• (i) and (ii)

• (i) and (iii)

• (ii) and (iv)

• (iii) and (iv).