621.

Which halogen forms only one oxoacid (HOX)?

• F

• Cl

• Br

• I

Which is correct regarding acidity?

• H₂S <H₂Se

• H₂S> H₂Se

• H₂Se > H₂Te

• None of these.

Tincture of iodine is

• aqueous solution of I₂

• solution of I₂ in aqueous KI

• alcohol-water solution of I₂

• aqueous solution of KI

XeF₆ on complete hydrolysis produces

• XeOF₄

• XeO₂F₄

• XeO₃

• XeO₂

The number of disulphide linkages present in insulin are :

• 1

• 2

• 3

• 4

The composition of carnallite is

• KCl.MgCl₂.6H₂O

• NaAlO₂

• Fe₃O₄

• Na₃AlF₆

Assertion: Sb₂S₃ is not soluble in yellow ammonium sulphide.

Reason : The common ion effect due to S^2- ions reduces the solubility of Sb₂S₃

• 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.

Phosgene is the common name of the following compound :

• Mixture of CO₂ and Cl₂

• POCl₃

• Carbonyl chloride

• Carbon tetrachloride

Assertion: H₃PO₃is dibasic acid.

Reason: Two hydrogen atoms are directly attached to the P.

• 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.

How many P = 0 bond present in (HPO₃)₃?

• 0

• 3

• 6

• 9