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.

Assertion : Sb (II) is not precipitated as sulphide when in its alkaline solution H₂S is passed.

Reason : The concentration of S^2- ion in alkaline medium is inadequate for precipitation.

• 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 : Addition of silver ions to a mixture of aqueous sodium chloride and sodium bromide solution will first precipitate AgBr rather than AgCl.

Reason : K_sp of AgCl < K_sp of AgBr.

• 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.

Strongest acid among the following is

• acetic acid

• FCH₂COOH

• F₂CHCOOH

• F₃CCOOH

Which of the following hydrogen halides is most  basic?

• HF

• HCl

• HBr

• HI

Sulphuryl chloride (SO₂Cl₂) reacts with white phosphorus (P₄) to give

• PCl₅, SO₂

• OPCl₃, SOCl₂

• PCl₅, SO₂, S₂Cl₂

• OPCl₃, SO₂, S₂Cl₂

Which of the following order of basic strength is correct?

• NH₃ < NH₂OH < HN₃ < NH₂-NH₂

• NH₂OH <HN₃ <NH₂-NH₂ <NH₃

• HN₃ <NH₃ <NH₂OH <NH₂-NH₂

• HN₃ <NH₂OH <NH₂-NH₂<NH₃

Which one forms KHX₂ type compound?

• HF

• HCl

• HI

• HBr

Which of the following is stable (inert) to fire?

• CCl₄

• C₂H₅OH

• CH₄

• C₄H₁₀