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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?
(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.
(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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