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The p-Block Elements

Multiple Choice Questions

831.

An organic compound having carbon, hydrogen and sulphur contains 4% of sulphur. The minimum molecular weight of
the compound is

832.

Which has the smallest size?

Na⁺
Mg²⁺
Al³⁺
P⁵⁺

833.

The bond angles of ${NH}_{3} > {NH}_{4}^{+} and {NH}_{2}^{-}$ are in the order

${NH}_{2}^{-} > {NH}_{3} > {NH}_{4}^{+}$
${NH}_{4}^{+} > {NH}_{3} > {NH}_{2}^{-}$
${NH}_{3} > {NH}_{2}^{-} > {NH}_{4}^{+}$
$NH > {NH}_{4}^{+} > {NH}_{2}^{-}$

834.
Amongest NO $_{3}^{-}$ , AsO $_{3}^{3 -}$ -, CO $_{3}^{2 -}$ , ClO $_{3}^{-}$ , SO $_{3}^{2 -}$ and BO $_{3}^{3 -}$ , the non-planar species are

CO $_{}^{_{3}^{2 -}}$

AsO $_{3}^{3 -}$ , ClO $_{3}^{-}$ and SO $_{3}^{2 -}$

NO $_{3}^{-}$ , CO $_{3}^{2 -}$ and BO $_{3}^{3 -}$

SO $_{3}^{2 -}$ , NO $_{3}^{-}$ and BO $_{3}^{3 -}$

AsO $_{3}^{3 -}$ , ClO $_{3}^{-}$ and SO $_{3}^{2 -}$

NO $_{3}^{-}$ , CO $_{3}^{2 -}$ and BO $_{3}^{3 -}$ have sp² hybridisation and hence are planar species while AsO $_{3}^{3 -}$ , ClO $_{3}^{-}$ and SO $_{3}^{2 -}$ have sp² hybridisation and hence are non- planar species.

835.

Iodine is formed when potassium iodide reacts with a solution of

ZnSO₄
CuSO₄
(NH₄)₂SO₄
Na₂SO₄

836.

Which of the following hydrogen bonds are strongest in vapour phase?

HF..........HF
HF..........HCl
HCl..........HCl
HF..........HI

837.

Compound A and B are treated with dil. HCl separately. The gases liberated are Y and Z respectively. Y turns acidified dichromate paper green while Z turns lead acetate paper black. The compound A and B are respectively.