NEET UG CHEMISTRY MCQ: 13 TH GROUP ELEMENTS (P-BLOCK)

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(A): Among IIIA group gallium has low melting point.

(R): Gallium has

4 s^2 4 p^1

configuration in the valence shell.

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Correct option: B

Both (A) and (R) are true and (R) is not the correct explanation of (A)

Option B is correct because Gallium does have a low melting point and its valence shell configuration is 4s²4p¹, but the configuration doesn't directly explain the low melting point.

More Questions from 13 TH GROUP ELEMENTS (P-BLOCK)

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The hardest compound of boron is: Which does not show inert pair effect? Which one of the following does not exist in the free state On strong heating of

{H}_3 {PO}_4

and

{H}_3 {BO}_3

, sum of oxidation number of

{P}\, \& {~B}

in the final product obtained is Compound ‘X’ reacts with

N{H_3}

to 473 K give another compound ‘Y’. X can be prepared by heating

B{F_3}

with sodium hydride. The compound ‘Y’ is represented by the formula Assertion: Electronegativity first increases from B to Al and then decreases from Al to

\mathrm{TI}

.

Reason: Due to poor shielding by inner

\mathrm{d}

and

\mathrm{f}

electrons.