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The p-Block Elements

Multiple Choice Questions

691.

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

692.

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.

693.

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.

694.

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.

695.

Strongest acid among the following is

acetic acid
FCH₂COOH
F₂CHCOOH
F₃CCOOH

696.
Which of the following hydrogen halides is most basic?

HF

HCl

HBr

HI

The bond strength H-X decreases from HF to HI. Thus HF is the most stable and hence weakest acid while is least stable and most acidic. In aqueous solutions, HF is only slightly ionised but HCl, HBr and HI are almost completely ionised. As basicity is the reverse of acidity. Therefore, HF is the most basic of all H-X.