Question 1

In which of the following molecules, all bond lengths are not equal?

Accepted Answer

In PCl _5 bond length of axial bond is greater than the length of equatorial bond.

Question 2

The sol formed in the following unbalanced equation is As _2 O _3+ H _2 ~S

Accepted Answer

As _2 O _3+3 H _2 ~S As _2 ~S _3+3 H _2 O

Question 3

Which of the following oxo acid of sulphur has O-O bond?

Accepted Answer

Answer option index: 1

Question 4

S - S bond is not present in

Accepted Answer

S _2 O _7^ 2- has S - O - S bond.

Question 5

The total number of P - OH bonds for pyrophosphoric acid

Accepted Answer

The structure of pyrophosphoric acid is There are 4 P - OH bonds, 1 P - O - P bond and two P = O bonds.

Question 6

Identify the incorrect statement:

Accepted Answer

The S _ 6 molecule has a chair-form hexagon ring with the approx same bond length as that in S _ 8 , but with some what smaller bond angles i.e. bond lengths are approx same but bond angles are different.

Question 7

Hydrolysis of NCl _ 3 gives NH _ 3 and X . Which of the following is X ?

Accepted Answer

Completing the reaction, we get NCl _ 3 +3 H _ 2 O 3 ' x ^ HClO + NH _ 3

Question 8

Nitrogen is obtained by the thermal decomposition of:

Accepted Answer

NH _ 4 NO _ 2 N _ 2 +2 H _ 2 O

Question 9

Phosphine is not obtained by which of the following reaction?

Accepted Answer

Red P doesnot react with NaOH to give PH _ 3 .

p Block Elements (Group 15, 16, 17 & 18) — Previous Year Questions & Solutions