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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Among the following which is/are the correct statement(s) about $P_{4} O_{6}$ and $P_{4} O_{10}$ ?

(i) Both form oxyacids $H_{3} {PO}_{3}$ and $H_{3} {PO}_{4}$ respectively

(ii) In $P_{4} O_{6}$ each $P$ is joined to four $O$ and in $P_{4} O_{10}$ each $P$ is joined to six $O$ atoms.

(iii) In $P_{4} O_{6}$ each $P$ is joined to three $O$ and in $P_{4} O_{10}$ each $P$ is joined to four $O$ atoms.

(iv) In $P_{4} O_{6}$ each $P$ is joined to three $O$ and in $P_{4} O_{10}$ each $P$ is joined to five $O$ atoms.

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Important Questions on p- Block Elements

MEDIUM

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

Strong reducing behaviour of

H_{3} P O_{2}

is due to:

EASY

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

Identify the correct statement from the statements given below.

EASY

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

The correct statement regarding

H_{3} {PO}_{3}

and

H_{3} {PO}_{4}

among the following is

EASY

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

By the action of concentrated

H_{2} {SO}_{4}

, phosphorus changes to:

MEDIUM

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

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

EASY

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

The number of

P - OH

bonds present in pyrophosphoric acid and hypophosphoric acid is respectively

EASY

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

In a molecule of pyrophosphoric acid, the number of

P - O H, P = 0 and P - O - P

bonds/moiety(ies) respectively are :

MEDIUM

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

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

MEDIUM

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

Which of the following compounds has a

P - P

Bond?

MEDIUM

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

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

EASY

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

What is the lowest oxidation state possessed by phosphorus in its oxyacids?

EASY

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

In which of the following acid, the maximum number of hydrogen atoms are joined directly with phosphorous?

EASY

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

Phosphorous forms different oxyacids such as, hypophosphorous acid

(H_{3} {PO}_{2})

, orthophosphorous acid

(H_{3} {PO}_{3})

and orthophosphoric acid

(H_{3} {PO}_{4})

. Orthophosphorous acid on heating forms orthophosphoric acid, which on heating first forms pyrophosphoric acid

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

and on further heating forms polyphosphoric acid. The correct statement is.

MEDIUM

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

How many number of

σ

and

π

bonds are in cyclotrimetaphosphoric acid molecule respectively?

MEDIUM

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

The oxyacid of phosphorus that contains one

P - OH,

two

P - H

and one

P = O

bonds is

HARD

Chemistry>Inorganic Chemistry>p- Block Elements>Preparation of 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:

MEDIUM

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

The pair that contains two

P - H

bonds in each of the oxoacids is:

Important Questions on p- Block Elements

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