MCQ on P Block Elements Class 11 With Answers

(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.

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

(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.

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

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

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

Answer: SF₄

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

[A] (NH₄)₂Cr₂O₇

[B] K₂Cr₂O₇

[C] Zn(ClO₃)₂

[D] KClO₃

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

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-

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]

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

Answer: BBr₃> BCl₃ > BF₃

(12) Graphite has a structural similarity with

[A] B₂H₆

[B] B₄C

[C] B

[D] BN

Answer: BN

(13) Find the amphoteric oxide

[A] CaO₂

[B] CO₂

[C] SnO₂

[D] SiO₂

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

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

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

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

Answer: A mixture of O₂ and N₂

(18) Which noble gas is most abundant in atmosphere?

[A] He

[B] Ne

[C] Ar

[D] Kr

Answer: Ar

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

[A] Hypophosphorous acid

[B] Phosphorous acid

[C] Pyrophosphoric acid

[D] Orthophosphoric acid

Answer: Pyrophosphoric acid

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

[A] N₃H

[B] NH₂OH

[C] N₂H₄

[D] NH₃

Answer: N₃H

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