MCQ on The P Block Elements for Class 11 With Answers | The P Block Elements MCQs

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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.

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.

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 S2O72-, S2O32-
B S4O62-, S2O72-
C S2O72-, S2O82-
D S4O62-, S2O32-

Answer:S4O62-, S2O32-
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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