MCQ on P Block Elements Class 11 With Answers

Questions

1 Identify the correct resonance structures of carbon dioxide from the ones given below :

A O – C ≡ O

B O = C = O

C –O ≡ C – O+

D –O – C ≡ O+

Answer:B, D

2 Assertion (A): If aluminium atoms replace a few silicon atoms in three dimensional network of silicon dioxide, the overall structure acquires a negative charge.

Reason (R) : Aluminium is trivalent while silicon is tetravalent.

A Both A and R are correct and R is the correct explanation of A.

B Both A and R are correct but R is not the correct explanation of A.

C Both A and R are not correct

D A is not correct but R is correct.

View Answer

Answer:Both A and R are correct and R is the correct explanation of A.

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3 Assertion (A): Silicons are water repelling in nature.

Reason (R) : Silicons are organosilicon polymers, which have (–R2SiO–) as repeating unit.

A A and R both are correct and R is the correct explanation of A.

B Both A and R are correct but R is not the correct explanation of A.

C A and R both are not true.

D A is not true but R is true.

View Answer

Answer:Both A and R are correct but R is not the correct explanation of A.

4 P₄O₁₀ has ______ bridging O atoms

A 4

B 5

C 6

D 2

View Answer

Answer:6

5 Which of the statement is incorrect for XeO₄ ?

A four p𝜋-d𝜋 bonds are present

B four sp3 – p 𝜎 bonds are present

C It has a tetrahedral shape

D It has a square planar shape

View Answer

Answer:It has a square planar shape

6 Which of the species has a permanent dipole moment?

A SF₄

B SiF₄

C BF₃

D XeF₄

View Answer

Answer:SF₄

7 Oxygen is not released on heating which of the compounds?

A (NH₄)₂Cr₂O₇

B K₂Cr₂O₇

C Zn(ClO₃)₂

D KClO₃

View Answer

Answer:(NH₄)₂Cr₂O₇

8 Which is the correct order of decreasing bond dissociation enthalpy?

A F2 > Cl2 > Br2 > I2

B I2 > Br2 > Cl2 > F2

C Cl2 > Br2 > F2 > I2

D Br2 > I2 > F2 > Cl2

View Answer

Answer:Cl2 > Br2 > F2 > I2

9 S-S bond is present in which of the ion pairs

A S₂O₇^2-, S₂O₃^2-

B S₄O₆^2-, S₂O₇^2-

C S₂O₇^2-, S₂O₈^2-

D S₄O₆^2-, S₂O₃^2-

View Answer

Answer:S₄O₆^2-, S₂O₃^2-

10 In the presence of KF, AlF₃ is soluble in HF. Find the complex formed

A K₃[AlF₆]

B AlH₃

C K[AlF₃H]

D K₃[AlF₃H₃]

View Answer

Answer:K₃[AlF₆]

11 Which is the correct order of decreasing acidity of lewis acids?

A BBr₃> BCl₃ > BF₃

B BF₃> BCl₃ > BBr₃

C BCl₃ > BF₃ > BBr₃

D BBr₃ > BF₃ > BCl₃

View Answer

Answer:BBr₃> BCl₃ > BF₃

12 Graphite has a structural similarity with

A B₂H₆

B B₄C

C B

D BN

View Answer

Answer:BN

13 Find the amphoteric oxide

A CaO₂

B CO₂

C SnO₂

D SiO₂

View Answer

Answer:SnO₂

14 One mole of magnesium nitride on the reaction with an excess of water gives:

A one mole of ammonia

B one mole of nitric acid

C two moles of ammonia

D two moles of nitric acid

View Answer

Answer:two moles of ammonia

15 The brown ring test for nitrates depends on

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

View Answer

Answer:the reduction of nitrate to nitric oxide

16 In which of the following arrangements, the sequence is not strictly according to the property written against it?

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

View Answer

Answer:NH₃ < PH₃ < AsH₃ < SbH₃ : Increasing basic strength

17 The reaction of P₄ with X leads selectively to P₄O₆. The X is

A Dry O₂

B A mixture of O₂ and N₂

C Moist O₂

D O₂ in the presence of aqueous NaOH

View Answer

Answer:A mixture of O₂ and N₂

18 Which noble gas is most abundant in atmosphere?

A He

B Ne

C Ar

D Kr

View Answer

Answer: Ar

19 Which of the following contains P - O - P bond?

A Hypophosphorous acid

B Phosphorous acid

C Pyrophosphoric acid

D Orthophosphoric acid

View Answer

Answer:Pyrophosphoric acid

20 In which of the following compounds, nitrogen exhibits highest oxidation state?

A N₃H

B NH₂OH

C N₂H₄

D NH₃

View Answer

Answer:N₃H

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