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-2>Q 99

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Which of the following does not have $S - S$ Linkage but has $O - O$ Linkage?

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Important Questions on The p-Block Elements

HARD

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Alpha Question Bank for Engineering: Chemistry>Chapter 19 - The p-Block Elements>Exercise-2>Q 101

Hydrolysis of one mole of peroxydisulphuric acid produces

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Alpha Question Bank for Engineering: Chemistry>Chapter 19 - The p-Block Elements>Exercise-2>Q 102

The reaction of

{SO}_{2}

with

{PCl}_{5}

, yield two oxohalides

A

and

B

.

' A'

can also be prepared industrially by the reaction of

{SO}_{3}

and

{SCl}_{2}

. Which of the following about

A

and

B

is incorrect ?

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Alpha Question Bank for Engineering: Chemistry>Chapter 19 - The p-Block Elements>Exercise-2>Q 104

The aqueous solution of hydrogen peroxide:

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Alpha Question Bank for Engineering: Chemistry>Chapter 19 - The p-Block Elements>Exercise-2>Q 105

Consider the following compounds:
(

1

) sulphur dioxide
(

2

) hydrogen peroxide
(

3

) ozone
Among these compounds, those which can act as bleaching agents would include :

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Alpha Question Bank for Engineering: Chemistry>Chapter 19 - The p-Block Elements>Exercise-2>Q 106

Bleaching of a fabric cloth is done using A and excess of chlorine is removed using B. A and B are

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Alpha Question Bank for Engineering: Chemistry>Chapter 19 - The p-Block Elements>Exercise-2>Q 107

Aqueous hypo solution on reaction with aqueous

{AgNO}_{3}

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Alpha Question Bank for Engineering: Chemistry>Chapter 19 - The p-Block Elements>Exercise-2>Q 108

What is the sum of highest and lowest oxidation states for oxygen family?

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Alpha Question Bank for Engineering: Chemistry>Chapter 19 - The p-Block Elements>Exercise-2>Q 109

How many of the following is correct order of specified property.

(a)	$N > P > As > Sb > Bi$	First ionisation enthalpy
(b)	$N > P > As > Sb$	Electronegativity
(c)	$N - N < P - P < As - As$	Single bond length
(d)	${As}^{3 +} > {Sb}^{3 +} > B^{3 +}$	Stability of $+ 3$ oxidation state
(e)	$White > Red > Black$	Reactivity of allotropes of phosphorus
(f)	$H_{3} {PO}_{2} < H_{3} {PO}_{3} < H_{3} {PO}_{4}$	Proticity of acids
(g)	$H_{3} {PO}_{2} < H_{3} {PO}_{3} < H_{3} {PO}_{4}$	Reducing power of acids