What is the electronic configuration of P in H 3 P O 4 ?

1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 4 s 1

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Half filled p orbital has greater symmetry and exchange energy which makes it very stable.

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Important Questions on The p-Block Elements

HARD

Chemistry>Inorganic Chemistry>The p-Block Elements>Atomic and Physical Properties of Group 15 Elements

The reaction of

H_{3} N_{3} B_{3} C l_{3} (A)

with

L i B H_{4}

in tetrahydrofuran gives inorganic benzene

(B)

. Further, the reaction of

(A)

with

(C)

leads to

H_{3} N_{3} B_{3} {(M e)}_{3}

. Compounds

(B)

and

(C)

respectively, are:

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Atomic and Physical Properties of Group 15 Elements

Which among the group -15 elements does NOT exist as tetra atomic molecule?

HARD

Chemistry>Inorganic Chemistry>The p-Block Elements>Atomic and Physical Properties of Group 15 Elements

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

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Atomic and Physical Properties of Group 15 Elements

(a)

N_{2}

is known whereas

P_{2}

is not known. Why?
(b) Bleaching of flowers by chlorine is permanent while that by sulphur dioxide is temporary. Explain.

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Atomic and Physical Properties of Group 15 Elements

Due to

pπ - pπ

bonding interactions, nitrogen for

N_{2}

but phosphorus forms and does not form a diatomic molecule.

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Atomic and Physical Properties of Group 15 Elements

Phosphorus pentoxide

(P_{2} O_{5})

is the starting material for phosphate esters used as surfactants and extraction agents.

P_{2} O_{5}

is extensively used as

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Atomic and Physical Properties of Group 15 Elements

With respect to group 15 elements, answer the following :

Comment on the trend in ionisation enthalpy giving reason.

HARD

Chemistry>Inorganic Chemistry>The p-Block Elements>Atomic and Physical Properties of Group 15 Elements

A molecular adduct is formed between

{BF}_{3}

and

{Et}_{2} O .

Which of the following values describe the coordination number

(CN)

, valency

(V)

and oxidation state

(OS)

B

atom in this adduct?

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Atomic and Physical Properties of Group 15 Elements

An element

X

belongs to

4^{th}

period and

15^{th}

group of the periodic table. Which one of the following is true regarding order electronic configuration of

X .

It has

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Atomic and Physical Properties of Group 15 Elements

The first ionisation energies (in

{kJmol}^{- 1}

) of four consecutive elements of the second period are given in the options. The first ionisation energy of nitrogen is

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Atomic and Physical Properties of Group 15 Elements

Write the general electronic configuration of elements of group

15

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Atomic and Physical Properties of Group 15 Elements

Of the following compounds, the most acidic is:

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Atomic and Physical Properties of Group 15 Elements

The element that does NOT exhibits allotropy is-

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Atomic and Physical Properties of Group 15 Elements

The correct option from below is

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Atomic and Physical Properties of Group 15 Elements

White phosphorous

P_{4}

has the following characteristics

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Atomic and Physical Properties of Group 15 Elements

Of the following compounds, the most acidic is-

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Atomic and Physical Properties of Group 15 Elements

Which of the following pair of elements has a maximum difference of radii?

HARD

Chemistry>Inorganic Chemistry>The p-Block Elements>Atomic and Physical Properties of Group 15 Elements

Based on the compounds of group

15

elements, the correct statement(s) is (are)-

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Atomic and Physical Properties of Group 15 Elements

Which of the following elements can be involved in

p π - d π

bonding?

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Atomic and Physical Properties of Group 15 Elements

What is the electronic configuration of

P

H_{3} P O_{4}

Half filled p orbital has greater symmetry and exchange energy which makes it very stable.

Important Questions on The p-Block Elements

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