Which of the following can be oxidised by SO₂?

• K₂Cr₂O₇

• Mg

• H₂O

• All of these

Which one of the following is incorrect ?

• Ionisation enthalpy of molecular oxygen is very close to that of Xe

• Only type of interatomic interaction between particles of noble gases are weak dispersion forces

• Hydrolysis of XeF₆ is not a redox reaction

• Xenon fluorides are not reactive

Which one ofthe following nitrogen oxides does not contain N-N bonds?

• N₂O

• N₂O₃

• N₂O₄

• N₂O₅

Assertion : Charcoal is used in separation of noble gases.

Reason : Charcoal has porous structure

• 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

Rhombic sulphur dissolves best in

• CS₂

• H₂O

• ethanol 

• ether

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