Here is a vast collection of objective and subjective questions in this question bank of chemistry 12, chapter 04. Following types of questions have been included here.
- MCQs (Textbook Exercise)
- MCQs (Previous Boards Essentials)
- SQs Topic-wise (Previous Boards Essentials + Textbook Conceptuals)
- LQs (Previous Boards Essentials)
You can find solutions to these questions from our publication, “An Insight Into Objective Chemistry-12”.
MCQs (Textbook Exercise)
Q. Each question has four possible answers. Tick the correct one.
01: Out of all the elements of group VA, the highest ionization energy is possessed by: (GJR-14)(BWP-17,22)(LHR-17)(SRG-18)
(a) N
(b) P
(c) Sb
(d) Bi
02: Among group VA elements, the most electronegative element: (RWP-14)(LHR-16)(MLT-16,19)(DGK-19)(SWL-22)
(a) Sb
(b) N
(c) P
(d) As
03: Oxidation of NO in air produces: (SWL-14,15)(RWP-15,17)(MLT-15,17,18)(LHR-16)(GJR-19,22)
(a) N2O
(b) N2O3
(c) N2O4
(d) N2O5
04: The brown gas formed, when metal reduces HNO3: (LHR-14)(GJR-14,19)(DGK-15,16,17,22)(MLT-15,22)(AJK-16)(SWL-17)(RWP-18)(FSL-19)
(a) N2O5
(b) N2O3
(c) NO2
(d) NO
05: Laughing gas is chemically: (FSL-14)(BWP-14,15,18,19)(LHR-14,15,19,22)(RWP-14,17,19)(SWL-16)(DGK-16,22)(GJR-17)(SRG-18,19)
(a) NO
(b) N2O
(c) NO2
(d) N2O4
06: Out of all the elements of group VIA, the highest melting and boiling points is shown by the element: (SRG-14)(FSL-17)
(a) Te
(b) Se
(c) S
(d) Pb
07: SO3 is not absorbed in water directly to form H2SO4 because:
(a) The reaction does not go to completion
(b) The reaction is quite slow
(c) The reaction is highly exothermic
(d) SO3 is insoluble in water
08: Which catalyst is used in contact process? (LHR-14,17,18,22)(BWP-15)(SRG-15,16,17,18)(FSL-15,22)(MLT-17,22)(SWL-19)(AJK-19)
(a) Fe2O3
(b) V2O5
(c) SO3
(d) Ag2O
09: Which of the following species has the maximum number of unpaired electrons? (GJR-14,15)(MLT-14,19)(AJK-15)(SRG-15)(FSL-18,19)(BWP-19)(RWP-22)
(a) O2
(b) O21+
(c) O21–
(d) O22–
MCQs (Previous Boards Essentials)
Q. Each question has four possible answers. Tick the correct one.
01: Which metal is rendered passive by HNO3 due to the formation of film of metal oxide over the metal? (SRG-14)
(a) Pt
(b) Sn
(c) Co
(d) Mn
02: Nitric acid does not react with all metals given except: (FSL-21)
(a) Gold
(b) Platinum
(c) Magnesium
(d) Iridium
03: Gold dissolves in aqua regia due to the formation of halide. Point out the correct halide. (MLT-16)
(a) AuF3
(b) AuCl3
(c) AuBr3
(d) AuI3
04: What is the % age of calcium phosphate in bone ash? (DGK-15)
(a) 20
(b) 40
(c) 80
(d) 60
05: The lowest ionization energy is possessed by: (SRG-19)
(a) P
(b) N
(c) Sb
(d) As
SHORT QUESTIONS
4.1: INTRODUCTION
Q.01: How does nitrogen differ from other elements of its group? (SWL-17)(BWP-18,19)(LHR-19)(AJK-19,21)(GJR-22)(MLT-22)
Q.02: Phosphorus element can form five covalent bonds, nitrogen cannot, why? (RWP-21)
4.2: NITROGEN AND ITS COMPOUNDS
Q.03: Give names and formulas of two oxides of Nitrogen. (BWP-22)
Q.04: Draw the structures of: (a) N2O (b) NO2 (c) N2O5
Q.05: What is laughing gas? How is it prepared? Give one reaction. (RWP-21)
Q.06: Write two reactions for the preparation of dinitrogen oxide. (DGK-17)(SRG-21)
Q.07: How does N2Osupport combustion? Give examples. (GJR-14)(LHR-17)(MLT-18)
Q.08: Write two reactions, which show the oxidizing behavior of N2O. (DGK-21)
Q.09: Write two methods of preparation of NO. (FSL-21)
Q.10: How does NO act as an oxidizing agent? (BWP-14)(LHR-15)(MLT-16,19)(FSL-16)(SWL-19)(DGK-19)
Q.11: Complete and balance the equations: (1) NO + Cl2 ⟶? (2) FeSO4 + NO ⟶? (LHR-17)
Q.12: What is Ring test? (DGK-14)(BWP-17)(SWL-17)(LHR-18)(AJK-19)(GJR-21)
Q.13: Describe ring test for the confirmation of the presence of nitrate ions in solution. (LHR-22)
Q.14: Write two methods for the preparation of NO2. (LHR-14)(GJR-19)(SRG-19)(DGK-21)
Q.15: What is the effect of heat on NO2? (MLT-15)(SRG-19)
Q.16: What happens when NO2 is dissolved in water? (LHR-14)(MLT-19)
Q.17: Write two reactions in which NO2 acts as a strong oxidizing agent. (RWP-14,19)(SRG-15)(GJR-15,18)(DGK-17,18)(MLT-17)(FSL-19,22)(SWL-19)
Q.18: Give equations to describe the reactions of NO2 with H2S and KI. (SRG-21)
Q.19: Write names, formulas and structures of two oxyacids of nitrogen. (LHR-16)(MLT-19)
Q.20: Write two reactions for the preparation of nitrous acid. (LHR-18)(DGK-19)
Q.21: Write two reactions in which HNO2 acts as an oxidizing agent. (SWL-22)
Q.22: Write two reactions in which HNO2 acts as reducing agent. (LHR-15)
Q.23: Write two reactions which show the reducing behavior of HNO2. (DGK-21)
Q.24: How nitrous acid reacts with CO(NH2)2 and C6H5NH2? (SRG-19)
Q.25: Complete and balance the following equations: 1) HNO2 + NH3 ⟶ 2) HNO2 + CO(NH2)2 ⟶
Q.26: Give laboratory preparation of HNO3. (DGK-14)
Q.27: Write outline equations for the preparation of HNO3 by Birkland and Eyde’s process. Ex.Q.5(a).
Q.28: Give a diagrammatic sketch of Birkland and Eyde’s process for the manufacture of nitric acid.
Q.29: Write down the reactions of HNO3 with: (a) CaO (b) Na2CO3 (SRG-22)
Q.30: Give reactions of HNO3 with carbon and sulphur. (BWP-14)
Q.31: Which metals evolve hydrogen gas upon reaction with nitric acid? Give two examples. Ex.Q.5(b).
Q.32: Write balanced chemical equations and the names of the products formed by the reaction of HNO3 with arsenic and antimony. (MLT-19)
Q.33: What is meant by fuming nitric acid? (MLT-22)(FSL-22)
Q.34: Write equations for the reaction of Cu with dilute and concentrated HNO3. (GJR-14,15,17)
Q.35: How does dilute HNO3 react with Cu and Mn? (FSL-14)(DGK-16)(GJR-18)
Q.36: Write equations for the reaction of Zn with the different concentrations of HNO3. (BWP-22)
Q.37: How moderately dilute and concentrated HNO3 react with Zn? (GJR-22)
Q.38: Write down chemical equations for the reaction of conc. HNO3 with: (a) Sn (b) Zn. (MLT-16,18)
Q.39: Write two reactions in which HNO3 acts as oxidizing agent. (FSL-19)
Q.40: How does aqua regia dissolve gold and platinum? OR What is aqua regia? How does it dissolve gold? (GJR-14,15,19,21)(MLT-14,19,21)(LHR-14,19,19,22)(AJK-15,19,22)(RWP-16,17,22)(SRG-16,19)(DGK-17)(BWP-18)(FSL-18)(SWL-22)
Q.41: Give four uses of nitric acid. (LHR-14,15)(MLT-14,19)(SRG-15)(BWP-18)(RWP-19)(DGK-22)
4.3: PHOSPHORUS AND ITS COMPOUNDS
Q.42: How does phosphorus occur in nature?
Q.43: What are the allotropic forms of phosphorus? (SWL-14)(LHR-18,22)(AJK-22)
Q.44: Discuss the properties of white phosphorus. (BWP-15,21)(RWP-18)
Q.45: What is red phosphorus? How is it prepared? (LHR-22)
Q.46: Write the two points of difference between red and white phosphorus. (FSL-19)
Q.47: What is black phosphorus? How is it prepared?
Q.48: Give two methods of preparation of PCl3. (GJR-22) Ex.Q.10(iv).
Q.49: Give the reactions of phosphorus with: (a) Thionyl chloride (b) Cl2 gas. (LHR-22)
Q.50: Give reactions of PCl3 with: (i) CH3OH (ii) CH3COOH.
Q.51: Give two methods of preparation of PCl5. (BWP-19)
Q.52: How does PCl5 react with water?
Q.53: How does P2O3 react with water in cold and hot states? (AJK-16)(RWP-17)(FSL-19)
Q.54: How does P2O5 react with water in cold and hot states? (LHR-15)
Q.55: P2O5 is a powerful dehydrating. Give two examples. (GJR-14)(FSL-14,16)(LHR-14,18)(MLT-15,18)(AJK-15,16)(FSL-16)(SWL-16)(RWP-17,19)(DGK-19) Ex.Q.10(v).
Q.56: Write names and formulas of oxyacids of phosphorus. (SRG-16)
Q.57: Write two reactions for the preparation of phosphorus acid. (SRG-17)(MLT-18,22)
Q.58: Give two reactions of H3PO3 as reducing agent.
Q.59: What is the action of nascent hydrogen on phosphorus acid?
Q.60: Give two laboratory preparations of phosphoric acid.
Q.61: How is H3PO4 prepared on large scale? (SWL-14)(SRG-19)
Q.62: Prove that H3PO4 is a tribasic acid. OR Write balanced chemical equations for the reactions of orthophosphoric acid with NaOH. (DGK-15)(FSL-19)
Q.63: What is the effect of heat on orthophosphoric acid? (LHR-14,18)(RWP-15)(SRG-19)(DGK-22)
Q.64: How is orthophosphoric acid converted into pyro and metaphosphoric acids? (GJR-19)(SWL-19)
4.4: GROUP VIA ELEMENTS
Q.65: Why are group VIA elements called chalcogens?
Q.66: Why the elements of group VIA other than oxygen show more than two oxidation states? (GJR-15)(BWP-17,18)(DGK-18)(AJK-21) Ex.Q.4(iii).
Q.67: Discuss allotropy in group VIA.
Q.68: Write down formulas of the following minerals: (a) Galena (b) Heavy spar. (GJR-21)
Q.69: Write down formulas of the following minerals: (a) Zinc blend (b) Cinabar (c) Stibnite (d) Copper pyrite.
Q.70: Give four similarities between oxygen and sulphur. (LHR-14,19,19,21)(FSL-22)
Q.71: Give four dissimilarities between oxygen and sulphur. (DGK-14,15,17,21)(LHR-14,17,19)(BWP-15)(SRG-15,18)(SWL-18,21)(GJR-19)
4.5: SULPHURIC ACID, H2SO4
Q.72: What is contact process? Give its outline principle.
Q.73: How is SO2 produced in Sulphur burners in contact process?
Q.74: What is the function of purifying unit in contact process? Name its parts with their proper roles.
Q.75: Why is it necessary to remove arsenic oxide from the reacting gases in contact process? OR How Arsenic is removed in contact process? (MLT-21)
Q.76: What is the role of contact tower in contact process?
Q.77: Why is SO3 dissolved in H2SO4 and not in water? (LHR-14,16)(DGK-14,15)(FSL-14,17)(MLT-15,18,22)(SRG-15,18)(RWP-16,22)(SWL-16,21)(BWP-17,19)(GJR-22)
Q.78: What are the advantages of Contact Process? (BWP-19,19)
Q.79: Give two reactions in which H2SO4 acts as an acid. (BWP-17)
Q.80: Give two reactions of H2SO4 in which it acts as a dehydrating agent. OR H2SO4 is a dehydrating agent, prove. (DGK-14,15,18,22)(MLT-14,21)(RWP-14,17)(LHR-16,18,19)(GJR-17,21)
Q.81: What happens when following compounds are heated with H2SO4? (a) C6H12O6 (b) C2H5OH. (FSL-19)
Q.82: Give two reactions of H2SO4 in which it acts as an oxidizing agent. (SRG-17)(GJR-19)(FSL-19,21)(DGK-22)
Q.83: Write two precipitation reactions of H2SO4. (MLT-17)(SWL-18)
Q.84: How does hot and concentrated H2SO4 react with Cu and Ag? (GJR-19)
Q.85: Write any four important uses of H2SO4. (LHR-14,18,21)(GJR-14)(SRG-15,18)(DGK-16)(FSL-17,22)
Q.86: Complete and balance the following equations:
(i) P + NO2 ⟶ (FSL-19)
(ii) HNO3 + HI ⟶ (FSL-19)
Q.87: Complete and balance the following equations:
(i) H2SO4 + NO2 ⟶ (BWP-19)
(ii) KNO3 + H2SO4 ⟶ (BWP-19)
Q.88: Complete and balance the following equations:
(i) H2S + NO ⟶ (DGK-19)(MLT-19)
(ii) H2SO3 + NO ⟶ (DGK-19)
Q.89: Complete and balance the following equations:
(i) H2S + NO ⟶ (SWL-19)
(ii) HNO3 + NH3 ⟶ (SWL-19)
Q.90: Complete and balance the following equations:
(i) KNO3 + H2SO4 ⟶ (MLT-21)
(ii) NO + Cl2 ⟶ (MLT-21)
Q.91: Complete and balance the following equations:
(i) Cu + H2SO4(conc.) ⟶ (BWP-19)
(ii) Zn + H2SO4(dil.) ⟶ (BWP-19)
LONG QUESTIONS
4.2: NITROGEN AND ITS COMPOUNDS.
01: Write preparation and two reactions of HNO2. (FSL-21)
02: Write down two reactions in which HNO2 acts as an oxidizing agent and two reactions in which HNO2 acts as a reducing agent. (RWP-21)
03: Give manufacture of nitric acid with diagram by Birkland’s and Eyde’s process. (GJR-15,21)(LHR-15)(DGK-15)(BWP-15)(MLT-15,18,21)
04: What happens when dilute HNO3 and conc. HNO3 react with the followings: (i) Cu (ii) Hg (iii) Sn (iv) Zn (SWL-14,21)(SRG-15)(GJR-18)
05: How does conc. HNO3 react with the following metals? (i) Cu (ii) Zn (iii) Mg (iv) Sn (LHR-21)
4.3: ALLOTROPES OF PHOSPHORUS.
05: Discuss various allotropes of phosphorus. (MLT-15)
4.4: GROUP VIA ELEMENTS
07: Describe eight points of similarities of Oxygen with Sulphur. (LHR-15)
08: Differentiate between Oxygen and Sulphur. (AJK-15)
09: Write down four similarities and four differences between Oxygen and Sulphur. (GJR-21)
4.5: SULPHURIC ACID
10: How sulphuric acid is prepared on commercial scale by contact process? (MLT-21)
11: Give four reactions of H2SO4 as an acid. (RWP-15)(DGK-18)(LHR-18)
12: What are dehydrating agents? Give any four reactions in which sulphuric acid plays the role of dehydrating agent. (DGK-21)
13: Discuss the reactions of sulphuric acid acts as a dehydrating agent. (BWP-21)
14: Sulphuric acid acts as an oxidizing agent and as a dehydrating agent. Describe two reactions in each case. (SRG-15,21)(DGK-15,21)
15: Give the reactions of sulphuric acid with: (i) Carbon (ii) Sulphur (iii) H2S (iv) HBr (AJK-21)
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