MCQ Questions for Class 12 Chemistry Chapter 7 The p-Block Elements with Answers

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The p-Block Elements Class 12 MCQs Questions with Answers

Solving the The p-Block Elements Multiple Choice Questions of Class 12 Chemistry Chapter 7 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on The p-Block Elements Class 12 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 7 Chemistry Class 12 and cross-check your answers during preparation.

Question 1.
Which of the following compounds contains S=O and S=S bonds?
(a) Sulphuric acid
(b) Thiosulphuric acid
(c) Sulphurous acid
(d) Thiosulphurous acid.

Answer

Answer: (b) Thiosulphuric acid


Question 2.
Which of the following halogen shows only negative oxidation state?
(a) Chlorine
(b) Bromine
(c) Fluorine
(d) Iodine

Answer

Answer: (c) Fluorine


Question 3.
Which of the following is the strongest acid?
(a) H2O
(b) H2S
(c) H2Se
(d) H2Te

Answer

Answer: (d) H2Te


Question 4.
The oxoacid of halogen having maximum acidic character is
(a) HCl4
(b) HClO3
(c) HClO2
(d) HClO

Answer

Answer: (a) HCl4


Question 5.
Which of the following oxide of nitrogen is called laughing gas?
(a) NO2
(b) N2O
(c) N2O3
(d) N2O5

Answer

Answer: (b) N2O


Question 6.
Among the following, which is the strongest oxidising agent?
(a) Br2
(b) l2
(c) Cl2
(d) F2

Answer

Answer: (d) F2


Question 7.
The basicity of H2PO2 is
(a) 1
(b) 2
(c) 3
(d) 4

Answer

Answer: (a) 1


Question 8.
The basicity of phosphorous acid H3PO3 is
(a) Two
(b) Three
(c) One
(d) Zero

Answer

Answer: (a) Two


Question 9.
Which of the following is a neutral oxide of nitrogen?
(a) N2O
(b) N2O5
(c) NO2
(d) N2O4

Answer

Answer: (a) N2O


Question 10.
Among the trihalides of nitrogen, which one is least basic?
(a) Nl3
(b) NBr3
(c) NCl3
(d) NF3

Answer

Answer: (d) NF3


Question 11.
The correct order of thermal stability of hydrogen halides (HX) is
(a) HI > HBr > HCl > HF
(b) HF > HCl > HBr > HI
(c) HCl < HF < HBr < HI
(d) HI > HCl > HF > HBr

Answer

Answer: (b) HF > HCl > HBr > HI


Question 12.
Maximum covalency of nitrogen is:
(a) 3
(b) 5
(c) 4
(d) 6

Answer

Answer: (c) 4


Question 13.
In the following compounds which has minimum boiling point?
(a) H2Se
(b) H2Te
(c) H2O
(d) H2S

Answer

Answer: (d) H2S


Question 14.
The shape of XeF4 is
(a) square planar
(b) tetrahedral
(c) square pyramidal
(d) trigonal bipyramidal

Answer

Answer: (a) square planar


Question 15.
In the following which is dibasic acid?
(a) H3PO4
(b) H3PO3
(c) H3PO2
(d) HClO4

Answer

Answer: (b) H3PO3


Question 16.
In the following strongest reducing agent is:
(a) PH3
(b) BiH3
(c) SbH3
(d) ASH3

Answer

Answer: (b) BiH3


Question 17.
On addition of cone. H2SO4 to a chloride salt, colourless fumes are evolved but in case of iodide salt, violet fumes come out. This is because
(a) H2SO4 reduces Hl to l2
(b) Hl is of violet colour
(c) Hl gets oxidised to l2
(d) Hl changes to HlO3

Answer

Answer: (c) Hl gets oxidised to l2


Question 18.
In qualitative analysis, when H2S is passed through an aqueous solution of salt acidified with dil. HCl, a black precipitate is obtained. On boiling the precipitate with dil. HNO3, it forms a solution of blue colour. Addition of excess of aqueous solution of ammonia to this solution gives
(a) deep blue precipitate of Cu (OH)2
(b) deep blue solution of [Cu(NH3)4]2+
(c) deep blue solution of Cu(NO3)2
(d) deep blue solution of Cu(OH)2. CU(NO3)2

Answer

Answer: (b) deep blue solution of [Cu(NH3)4]2+


Question 19.
In a cyclotrimetaphosphoric acid molecule, how many single and double bonds are present?
(a) 3 double bonds; 9 single bonds
(b) 6 double bonds; 6 single bonds
(c) 3 double bonds; 12 single bonds
(d) Zero double bonds; 12 single bonds

Answer

Answer: (c) 3 double bonds; 12 single bonds


Question 20.
Which of the following elements can be involved in pπ-dπ bonding?
(0) Carbon
(b) Nitrogen
(c) Phosphorus
(d) Boron

Answer

Answer: (c) Phosphorus


Question 21.
Which of the following pairs of ions are isoelectronic and isostructural?
(a) CO\(_{ 3 }^{2-}\), NO\(_{ 3 }^{-}\)
(b) ClO\(_{ 3 }^{-}\), CO\(_{ 3 }^{2-}\)
(c) SO\(_{ 3 }^{2-}\), NO\(_{ 3 }^{-}\)
(d) ClO\(_{ 3 }^{-}\), SO\(_{ 3 }^{2-}\)

Answer

Answer: (a) CO\(_{ 3 }^{2-}\), NO\(_{ 3 }^{-}\)


Question 22.
Affinity for hydrogen decreases in the group from fluorine to iodine. Which of the halogen acids should have highest bond dissociation enthalpy?
(a) HF
(b) HCl
(c) HBr
(d) HI

Answer

Answer: (a) HF


Question 23.
Bond dissociation enthalpy of E-H (E = element) bonds is given below. Which of the compounds will act as strongest reducing agent?
MCQ Questions for Class 12 Chemistry Chapter 7 The p-Block Elements with Answers 1
(a) NH3
(b) PH3
(c) ASH3
(d) SbH3

Answer

Answer: (d) SbH3


Question 24.
On heating with concentrated NaOH solution in an inert atmosphere of CO2, white phosphorus gives a gas. Which of the following statement is incorrect about the gas?
(a) It is highly poisonous and has smell like rotten fish.
(b) Its solution in water decomposes in the presence of light.
(c) It is more basic than NH3.
(d) It is less basic than NH3.

Answer

Answer: (c) It is more basic than NH3.


Question 25.
Which of the following acids forms three series of salts?
(a) H3PO2
(b) H3BO3
(c) H3PO4
(d) H3PO3

Answer

Answer: (c) H3PO4


Question 26.
Strong reducing behaviour of H3PO2 is due to
(a) Low oxidation state of phosphorus
(b) Presence of two -OH groups and one P-H bond
(c) Presence of one -OH group and two P-H bonds
(d) High electron gain enthalpy of phosphorus

Answer

Answer: (c) Presence of one -OH group and two P-H bonds


Question 27.
On heating lead nitrate forms oxides of nitrogen and lead. The oxides formed are
(a) N3O, PbO
(b) NO3, PbO
(c) NO, PbO
(d) NO, PbO2

Answer

Answer: (b) NO3, PbO


Question 28.
Which of the following elements does not show allotropy?
(a) Nitrogen
(b) Bismuth
(c) Antimony
(d) Arsenic

Answer

Answer: (a) Nitrogen


Question 29.
Which of the following statements is wrong?
(a) Single N-N bond is stronger than the single P-P bond.
(b) PH3 can act as a ligand in the formation of coordination compound with transition elements.
(c) NO2 is paramagnetic in nature.
(d) Covalency of nitrogen in N2O5 is four.

Answer

Answer: (a) Single N-N bond is stronger than the single P-P bond.


Question 30.
A brown ring is formed in the ring test for NO3 ion. It is due to the formation of
(a) [Fe(H2O)5 (NO)]2+
(b) FeSO4. NO2
(c) [Fe(H2O)4(NO)2]2+
(d) FeSO4.HNO3

Answer

Answer: (a) [Fe(H2O)5 (NO)]2+


Question 31.
Elements of group-15 form compounds in +5 oxidation state. However, bismuth forms only one well-characterised compound in +5 oxidation state. The compound is
(a) Bi3O5
(b) BiF5
(c) BiCl5
(d) Bi2S5

Answer

Answer: (b) BiF5


Question 32.
On heating ammonium dichromate and barium azide separately we get
(a) N2 in both cases
(b) N2 with ammonium dichromate and NO with barium azide
(c) N2O with ammonium dichromate and N2 with barium azide
(d) N2O with ammonium dichromate and NO2 with barium azide

Answer

Answer: (a) N2 in both cases


Question 33.
In the preparation of HNO3, we get NO gas by catalytic oxidation of ammonia. The moles of NO produced by the oxidation of two moles of NH3 will be
(a) 2
(b) 3
(c) 4
(d) 6

Answer

Answer: (a) 2


Question 34.
The oxidation state of central atom in the anion of compound NaH2PO2 will be
(a) +3
(b) +5
(c) +1
(d) -3

Answer

Answer: (c) +1


Question 35.
Which of the following is not tetrahedral in shape?
(a) NH\(_{ + }^{4}\)
(b) SiCl4
(c) SF4
(d) SO\(_{ + }^{2-}\)

Answer

Answer: (c) SF4


Question 36.
Which of the following are peroxoacids of sulphur?
(a) H2SO5 and H2S2O8
(b) H2SO5 and H2S2O7
(c) H2S2O7 and H2S2O8
(d) H2S2O6 and H2S2O7

Answer

Answer: (a) H2SO5 and H2S2O8


Question 37.
Hot cone. H2SO4 acts as moderately strong oxidising agent. It oxidises both metals and non-metals. Which of the following element is oxidised by cone. H2SO4 into two gaseous products?
(a) Cu
(b) S
(c) C
(d) Zn

Answer

Answer: (c) C


Question 38.
A black compound of manganese reacts with a halogen acid to give greenish yellow gas. When excess of this gas reacts with NH3 an unstable trihalide is formed. In this process the oxidation state of nitrogen changes from
(a) – 3 to + 3
(b) – 3 to 0
(c) – 3 to + 5
(d) 0 to – 3

Answer

Answer: (a) – 3 to + 3


Question 39.
In the preparation of compounds of Xe, Bartlett had taken O\(_{ 2 }^{+}\) PtF\(_{ 6 }^{-}\) as a base compound. This is because
(a) both O2 and Xe have same size.
(b) both O2 and Xe have same electron gain enthalpy.
(c) both O2 and Xe have almost same ionisation enthalpy.
(d) both Xe and O2 are gases.

Answer

Answer: (c) both O2 and Xe have almost same ionisation enthalpy.


Question 40.
In solid state PCl5 is a
(a) covalent solid
(b) octahedral structure
(c) ionic solid with [PCl6]+ octahedral and [PCl4] tetrahedra
(d) ionic solid with [PCl4]+ tetrahedral and [PCl6] octahedra

Answer

Answer: (d) ionic solid with [PCl4]+ tetrahedral and [PCl6] octahedra


Question 41.
Reduction potentials of some ions are given below. Arrange them in decreasing order of oxidising power.
MCQ Questions for Class 12 Chemistry Chapter 7 The p-Block Elements with Answers 2
(a) ClO4 > IO4 > BrO4
(b) IO4 > BrO4 > ClO4
(c) BrO4 > IO4 > ClO4
(d) BrO4 > ClO4 > IO4

Answer

Answer: (c) BrO4 > IO4 > ClO4


Question 42.
Which of the following is isoelectronic pair?
(a) ICl2, ClO2
(b) BrO2, BrF2+
(c) ClO2, BrF
(d) CN, O3

Answer

Answer: (b) BrO2, BrF2+


Assertion and Reason Type Questions

The questions given below consist of an assertion and a reason. Use the following key to choose the appropriate answer.
(a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).
(b) Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).
(c) Assertion (A) is correct, Reason (R) is wrong statement.
(d) Assertion (A) is wrong, but Reason (R) is correct statement.

Question 43.
Assertion: Ozone is a powerful oxidising agent in comparison to O2.
Reason: Ozone is diamagnetic but O2 is paramagnetic.

Answer

Answer: (b) Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).


Question 44.
Assertion: F2 has low reactivity.
Reason: F-F bond has low bond dissociation enthalpy.

Answer

Answer: (d) Assertion (A) is wrong, but Reason (R) is correct statement.


Question 45.
Assertion: F-F bond in F2 molecule is strong.
Reason: F atom is small in size.

Answer

Answer: (d) Assertion (A) is wrong, but Reason (R) is correct statement.


Question 46.
Assertion: P4 is more reactive than N2.
Reason: P-P single bond in P4 is much weaker than N ≡ N in N2 molecule.

Answer

Answer: (a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).


Question 47.
Assertion: Xenon forms fluorides.
Reason: Because 5d-orbitals are available for valence shell expansion.

Answer

Answer: (a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).


Question 48.
Assertion: HClO4 is stronger acid than HClO3.
Reason: Oxidation state of Cl in HClO4 is +7 and in HClO3 is +5.

Answer

Answer: (b) Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).


Question 49.
Assertion: Iodine dissolves in aqueous solution of potassium iodide.
Reason: Potassium iodide behaves as an organic solvent and therefore, dissolves non-polar iodine.

Answer

Answer: (c) Assertion (A) is correct, Reason (R) is wrong statement.


Question 50.
Assertion: HClO4 is stronger acid than HBrO4.
Reason: HClO4 ionises less in water than HBrO4.

Answer

Answer: (c) Assertion (A) is correct, Reason (R) is wrong statement.


Question 51.
Assertion: H3PO3 is a dibasic acid.
Reason: There are two H atoms directly bonded to P.

Answer

Answer: (c) Assertion (A) is correct, Reason (R) is wrong statement.


Question 52.
Assertion: Reaction of SO2 and H2S in the presence of Fe2O3 catalyst gives elemental sulphur.
Reason: SO2 is reducing agent.

Answer

Answer: (b) Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).


Question 53.
Assertion: The acidic strength of halogen acids varies in the order HF > HCl > HBr > HI.
Reason: The bond dissociation enthalpy of halogen acids decreases in the order HF > HCl > HBr > HI.

Answer

Answer: (d) Assertion (A) is wrong, but Reason (R) is correct statement.


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