Assertion : Reaction of SO₂ and H₂S in the presence of Fe₂O₃ catalyst gives elemental sulphur.

Reason : SO₂ is a reducing agent.

• 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.

The element which forms oxides in all oxidation states +I to +V is

• N

• P

• As

• Sb

The true statement for the acids of phosphorus, H₃PO₂, H₃PO₃ and H₃PO₄ is

• the order of their acidity is H₃PO₄ > H₃PO₃ > H₃PO₂

• all of them are reducing in nature

• all of them are tribasic acids

• the geometry of phosphorus is tetrahedral in all the three

The correct order of solubility in water for He, Ne, Ar, Kr, Xe is :

• He > Ne > Ar > Kr > Xe

• Xe > Kr > Ar > Ne > He

• Ne > Ar > Kr > He > Xe

• Ar > Ne > He > Kr > Xe

145.

For electron affinity of halogens which of the following is correct?

• Br > F

• F > Cl

• Br > Cl

• F > I

Which of the following does not have valence electron in 3d-subshell ?

• Fe (III)

• Cr (I)

• Mn (II)

• P (0)

Which of the following compound is a tribasic acid ?

• H₃PO₄

• H₃PO₂

• H₃PO₃

• H₄P₂O₇

At higher temperature, iodoform reaction is given by

• CH₃CO₂CH₃

• CH₃CO₂C₂H₅

• C₆H₅CO₂CH₃

• CH₃CO₂C₆H₅

Which of the following is arranged in the increasing order of enthalpy of vaporization?

• NH₃, PH₃, AsH₃

• AsH₃, PH_3, NH₃

• NH₃, AsH₃, PH₃

• PH₃, AsH_3, NH₃

Assertion: HClO₄ is a stronger acid than HClO₃.

Reason : Oxidation state of Cl in HClO₄ is +8 and in HClO₃ +5.

• 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.