p-Block Elements MCQs | Question – Paper 1 9

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Topic: p-Block Elements, Test No.: 01, Total MCQs: 15

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Question 1

When Cl2 gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from [CBSE AIPMT 2012]

A
Zero to – 1 and zero to +3
B
Zero to + 1 and zero to –3
C
Zero to + 1 and zero to –5
D
Zero to – 1 and zero to +5
Question 2

In which of the following compounds, nitrogen exhibits highest oxidation state? [CBSE AIPMT 2012]

A

N3H

B

NH2OH

C

N2H4

D

NH3

Question 3

Three reactions involving H2PO4- are given below [AIEEE 2010]

(i) H3PO4 + H2O ® H3O+ + H2PO4-

(ii) H2PO4- + H2O ® HPO42- + H3O+

(iii) H2PO4- + OH- ® H3PO4 + O2-

In which of the above does H2PO4- act as an acid?

A
(i) only
B
(ii) only
C
(iii) only
D
(i) and (ii)
Question 4

The correct order of increasing bond angles in the following species is [CBSE AIPMT 2010]

A

Cl2O < ClO2 < ClO2-

B

ClO2- < Cl2O < ClO2

C

Cl2O < ClO2- < ClO2

D

ClO2 < Cl2O < ClO2-

Question 5

The tendency of BF3, BCl3 and BBr3 to behave as Lewis acid decreases in the sequence: [CBSE AIPMT 2010]

A

BCl3 > BF3 > BBr3

B

BF3 > BCl3 > BBr3

C

BBr3 > BF3 > BCl3

D

BBR3 > BCl3 > BF3

Question 6

P4O10 is the anhydride of [West Bengal JEE 2010]

A

H3PO2

B

H3PO3

C

H3PO4

D

H4P2O7

Question 7

Which of the following statements regarding ozone is not correct? [West Bengal JEE 2010]

A
The oxygen-oxygen bond length in ozone is identical with that of molecular oxygen
B
The ozone is response hybrid of two structures
C
The ozone molecule is angular in shape
D
Ozone is used as a germicide and disinfectant for the purification of air.
Question 8

Which of the following contains P - O - P bond? [West Bengal JEE 2010]

A
Hypophosphorous acid
B
Phosphorous acid
C
Pyrophosphoric acid
D
Orthophosphoric acid
Question 9

Which noble gas is most abundant in atmosphere? [Delhi PMT 2010]

A
He
B
Ne
C
Ar
D
Kr
Question 10

The reaction of P4 with X leads selectively to P4O6. The X is [IIT-JEE 2009]

A

Dry O2

B

A mixture of O2 and N2

C

Moist O2

D

O2 in the presence of aqueous NaOH

Question 11

Which of the following reactions of xenon compounds is not feasible? [AIEEE 2009]

A

XeO3 + 6HF ® XeF6 + 3H2O

B

3XeF4 + 6H2O ® 2Xe + XeO3 + 12HF + 1.5O2

C

2XeF2 + 2H2O ® 2Xe + 4HF + O2

D

XeF6 + RbF ® Rb [XeF7]

Question 12

In which of the following arrangements, the sequence is not strictly according to the property written against it? [AIEEE 2009]

A

CO2 < SiO2 < SnO2 < PbO2 : Increasing oxidizing power

B

HF < HCl < HBr < HI : Increasing acid strength

C

NH3 < PH3 < AsH3 < SbH3 : Increasing basic strength

D

B < C < O < N : Increasing first ionization enthalpy

Question 13

Among the following which is the strongest oxidizing agent? [CBSE AIPMT 2009]

A

Br2

B

I2

C

Cl2

D

F2

Question 14

The brown ring test for nitrates depends on [Karnataka CET 2006]

A
reduction of ferrous sulphate to iron
B
oxidation of nitric oxide to nitrogen dioxide
C
the reduction of nitrate to nitric oxide
D
oxidising action of sulphuric acid
Question 15

One mole of magnesium nitride on the reaction with an excess of water gives: [AIEEE 2004]

A
one mole of ammonia
B
one mole of nitric acid
C
two moles of ammonia
D
two moles of nitric acid
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9 thoughts on “p-Block Elements MCQs | Question – Paper 1”

    • Reply ↓
      sidharth

      beacause in N3H nitrogen has an oxidation state of -1/3 which is greater than -2 or -3 , which they show in other compounds…

    • Reply ↓
      sanjna

      Becoz the oxidizing state of N3H is -1/3 which is lowest than others …as rest of the cmpds have oxidizing state -1 , -2, and -3 which is higher than N3H

    • Reply ↓
      Sachin

      3x+1=0 so x =-1/3 nd in rest off o states are smaller than this

    • Reply ↓
      sanyam

      since hydrolysis of xenon hexafluoride is feasible,the reverse reaction is infeasible.

    • Reply ↓
      Yayati

      I think it’s answer should be 3
      Since it disproportionate and dorm Xe and XeO3

      • Reply ↓
        Yayati

        Sorry wrong typed
        It’s answer is 1 st nd it is right
        Since in presence of water it gets hydrolysed…