Correctly match codes are: (1) H 3 PO 4 (p) Meta phosphoric acid (2) HPO 3 (q) Thio sulphuric acid (3) H 2 SO 4 (r) Ortho-phosphoric acid (4) H 2 S 2 O 3 (s) sulphuric acid

1 → r , 2 → p , 3 → s , 4 → q

1 → s , 2 → q , 3 → r , 4 → s

1 → q , 2 → r , 3 → p , 4 → q

1 → s , 2 → r , 3 → q , 4 → p

Phosphine is generally prepared in the laboratory by

heating white phosphorus with an aqueous solution of caustic soda.

heating phosphorus in a current of hydrogen.

decomposition of P 2 H 4 at 110 ° C .

heating red phosphorus with an aqueous solution of caustic soda.

What is inert pair effect?

The inert pair effect is the reluctance of s electrons of the outermost shell to participate in bonding. This is due to the poor screening effect of the d and f orbitals. This effect is observed among the p -block elements, due to which the lower oxidation state (two units less than the group oxidation state) becomes more stable for heavier elements in each group. For example in Pb , + 2 oxidation state is more predominant than the + 4 oxidation state.

Among the following, the correct statement(s) is(are)

The Lewis acidity of B C l 3 is greater than that of A l C l 3 .

A l C l 3 has the three-centre two-electron bonds in its dimeric structure.

E M B I B E

Alpha Question Bank for Engineering: Chemistry>Chapter 19 - The p-Block Elements>Exercise-1>Q 32

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IMPORTANT

Earn 100

Name of oxyanion of boric acid $(H_{3} {BO}_{3})$ is:

59.38% studentsanswered this correctly

Important Questions on The p-Block Elements

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IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 19 - The p-Block Elements>Exercise-1>Q 33

Correct match is:
(i)

{CrO}_{4}^{2 -} =

Chromate
(ii)

{MnO}_{4}^{2 -} =

Mangnate
(iii)

{BO}_{3} {}^{3 -}=

Borate
(iv)

{XeO}_{4}^{2 -} =

Xenate

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Alpha Question Bank for Engineering: Chemistry>Chapter 19 - The p-Block Elements>Exercise-1>Q 34

Sodium tri-sulphide formula is:

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Alpha Question Bank for Engineering: Chemistry>Chapter 19 - The p-Block Elements>Exercise-1>Q 35

{PO}_{4}^{3 -}

is

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Alpha Question Bank for Engineering: Chemistry>Chapter 19 - The p-Block Elements>Exercise-1>Q 36

Pyrophosphoric acid is:

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Alpha Question Bank for Engineering: Chemistry>Chapter 19 - The p-Block Elements>Exercise-1>Q 37

Correctly match codes are:

(1)	$H_{3} {PO}_{4}$	(p)	Meta phosphoric acid
(2)	${HPO}_{3}$	(q)	Thio sulphuric acid
(3)	$H_{2} {SO}_{4}$	(r)	Ortho-phosphoric acid
(4)	$H_{2} S_{2} O_{3}$	(s)	sulphuric acid

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Alpha Question Bank for Engineering: Chemistry>Chapter 19 - The p-Block Elements>Exercise-1>Q 40

If in an experiment

100 ml

of ozonised oxygen was reduced in volume to

40 ml

(at the same temperature and pressure) when treated with turpentine, what would be the increase in volume if the original sample was heated until no further change occurred and then brought back to the same temperature and pressure?

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Alpha Question Bank for Engineering: Chemistry>Chapter 19 - The p-Block Elements>Exercise-1>Q 43

P_{4}

(white)

+ NaOH + H_{2} O \to

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Alpha Question Bank for Engineering: Chemistry>Chapter 19 - The p-Block Elements>Exercise-1>Q 44

$\mathrm{CO}_{2}+\mathrm{NaOH} \longrightarrow \mathrm{Na}_{2} \mathrm{CO}_{3}+\mathrm{H}_{2} \mathrm{O}$
This reaction shows the following nature of $\mathrm{CO}_{2}$: