Match List-I with List-II List-I List-II Name of oxo acid Oxidation state of ' P (a) Hypophosphorous acid (i) + 5 (b) Orthophosphoric acid (ii) + 4 (c) Hypophosphoric acid (iii) + 3 (d) Orthophosphorous acid (iv) + 2 (v) + 1 Choose the correct answer from the options given below :

( a ) - ( v ) , ( b ) - ( i ) , ( c ) - ( ii ) , ( d ) - ( iii )

( a ) - ( iv ) , ( b ) - ( i ) , ( c ) - ( ii ) , ( d ) - ( iii )

( a ) - ( iv ) , ( b ) - ( v ) , ( c ) - ( ii ) , ( d ) - ( iii )

( a ) - ( v ) , ( b ) - ( iv ) , ( c ) - ( ii ) , ( d ) - ( iii )

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Hypophosphorous acid, having two P — H bonds, reduces silver nitrate to metallic silver.

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Important Questions on p-Block Elements

MEDIUM

Chemistry>Inorganic Chemistry>p-Block Elements>Compounds of Phosphorus

Match List-I with List-II

	List-I		List-II
	Name of oxo acid		Oxidation state of ' $P$
(a)	Hypophosphorous acid	(i)	$+ 5$
(b)	Orthophosphoric acid	(ii)	$+ 4$
(c)	Hypophosphoric acid	(iii)	$+ 3$
(d)	Orthophosphorous acid	(iv)	$+ 2$
		(v)	$+ 1$

Choose the correct answer from the options given below :

MEDIUM

Chemistry>Inorganic Chemistry>p-Block Elements>Compounds of Phosphorus

The pair that contains two

P - H

bonds in each of the oxoacids is:

MEDIUM

Chemistry>Inorganic Chemistry>p-Block Elements>Compounds of Phosphorus

Solid

A

reacts with strong

NaOH (aq)

liberating a foul smelling gas

B

which spontaneously burn in air giving smoky rings.

A

and

B

are respectively

MEDIUM

Chemistry>Inorganic Chemistry>p-Block Elements>Compounds of Phosphorus

Phosphorus reacts with chlorine gas to give a colourless liquid, which fumes in moist air to produce

HCl

and

MEDIUM

Chemistry>Inorganic Chemistry>p-Block Elements>Compounds of Phosphorus

The compound that cannot act both as oxidizing and reducing agent is

MEDIUM

Chemistry>Inorganic Chemistry>p-Block Elements>Compounds of Phosphorus

The number of ionisable hydrogens present in the product obtained from a reaction of phosphorus trichloride and phosphonic acid is:

MEDIUM

Chemistry>Inorganic Chemistry>p-Block Elements>Compounds of Phosphorus

The oxoacid of phosphorus having the strongest reducing property is

EASY

Chemistry>Inorganic Chemistry>p-Block Elements>Compounds of Phosphorus

Draw the structure of cyclometaphosphoric acid.

MEDIUM

Chemistry>Inorganic Chemistry>p-Block Elements>Compounds of Phosphorus

The oxyacid of phosphorus that contains one

P - OH,

two

P - H

and one

P = O

bonds is

EASY

Chemistry>Inorganic Chemistry>p-Block Elements>Compounds of Phosphorus

The correct statement regarding

H_{3} {PO}_{3}

and

H_{3} {PO}_{4}

among the following is

HARD

Chemistry>Inorganic Chemistry>p-Block Elements>Compounds of Phosphorus

The correct statement(s) related to oxoacids of phosphorous is(are)

MEDIUM

Chemistry>Inorganic Chemistry>p-Block Elements>Compounds of Phosphorus

The pair in which phosphorous atoms have a formal oxidation state of + 3 is:

MEDIUM

Chemistry>Inorganic Chemistry>p-Block Elements>Compounds of Phosphorus

Write the disproportionation reaction of

H_{3} {PO}_{3}

HARD

Chemistry>Inorganic Chemistry>p-Block Elements>Compounds of Phosphorus

The number of

P - OH

bonds and the oxidation state of phosphorus atom in pyrophosphoric acid

(H_{4} P_{2} O_{7})

, respectively are:

EASY

Chemistry>Inorganic Chemistry>p-Block Elements>Compounds of Phosphorus

Complete and balance the following reactions:

P_{4} + 10 H_{2} {SO}_{4} \to

_____+_____+_____.

MEDIUM

Chemistry>Inorganic Chemistry>p-Block Elements>Compounds of Phosphorus

How do you account for the reducing behaviour of

H_{3} {PO}_{2}

on the basis for its structure?

MEDIUM

Chemistry>Inorganic Chemistry>p-Block Elements>Compounds of Phosphorus

Give the structural formula of

H_{3} {PO}_{2}

EASY

Chemistry>Inorganic Chemistry>p-Block Elements>Compounds of Phosphorus

The number of

P - OH

bonds present in pyrophosphoric acid and hypophosphoric acid is respectively

MEDIUM

Chemistry>Inorganic Chemistry>p-Block Elements>Compounds of Phosphorus

The order of the oxidation state of the phosphorus atom in

H_{3} P O_{2}, H_{3} P O_{4}, H_{3} P O_{3}

and

H_{4} P_{2} O_{6}

MEDIUM

Chemistry>Inorganic Chemistry>p-Block Elements>Compounds of Phosphorus

Strong reducing behaviour of

H_{3} P O_{2}

is due to:

Hypophosphorous acid, having two P — H bonds, reduces silver nitrate to metallic silver.

Important Questions on p-Block Elements

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