NCERT Exemplar Chemistry - Class 12>Chapter 7 - The p-Block Elements>Short Answer Type>Q 42

HARD

12th CBSE

IMPORTANT

Earn 100

In ${PCl}_{5}$ , phosphorus is in ${sp}^{3} d$ hybridised state but all its five bonds are not equivalent. Justify your answer with reason.

Important Questions on The p-Block Elements

MEDIUM

12th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 12>Chapter 7 - The p-Block Elements>Short Answer Type>Q 43

Why is nitric oxide paramagnetic in gaseous state, but the solid obtained on cooling it is diamagnetic?

MEDIUM

12th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 12>Chapter 7 - The p-Block Elements>Short Answer Type>Q 45

Out of

H_{2} O

and

H_{2} S

, which one has the highest bond angle, and why?

MEDIUM

12th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 12>Chapter 7 - The p-Block Elements>Short Answer Type>Q 46

{SF}_{6}

is known but

{SCl}_{6}

is not. Why?

HARD

12th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 12>Chapter 7 - The p-Block Elements>Short Answer Type>Q 47

On reacting with

{Cl}_{2}

, phosphorus forms two types of halides

‘ A ’

and

‘ B ’

. Halide

A

is yellowish-white powder but halide

‘ B ’

is colourless oily liquid. Identify

A

and

B

, and write the formulae of their hydrolysis products.

HARD

12th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 12>Chapter 7 - The p-Block Elements>Short Answer Type>Q 48

In the ring test of

{NO}_{3}^{-}

ion,

{Fe}^{2 +}

ion reduces nitrate ion to nitric oxide, which combines with

{Fe}^{2 +} (aq)

ion to form brown complex. Write the reactions involved in the formation of brown ring.

HARD

12th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 12>Chapter 7 - The p-Block Elements>Short Answer Type>Q 49

Explain why the stability of oxoacids of chlorine increases in the order given below:

$HClO < {HClO}_{2} < {HClO}_{3} < {HClO}_{4}$

HARD

12th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 12>Chapter 7 - The p-Block Elements>Short Answer Type>Q 50

Explain why ozone is thermodynamically less stable than oxygen.

HARD

12th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 12>Chapter 7 - The p-Block Elements>Short Answer Type>Q 51

P_{4} O_{6}

reacts with water according to equation

P_{4} O_{6} + 6 H_{2} O \to 4 H_{3} {PO}_{3}

. Calculate the volume of

0.1 M NaOH

solution required to neutralise the acid formed by dissolving

1.1 g

of

P_{4} O_{6}

in

H_{2} O

.