Question Bank | Chem-12, Ch-03

Here is a vast collection of objective and subjective questions in this question bank of chemistry 12, chapter 03. 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: Which metal is used in thermite process because of its activity? (GJR-14,19,22)(RWL-15)(DGK-15,16,17)(MLT-15,18,19)(LHR-16,18)(SRG-17)(SWL-17)(BWP-19,19)

(a) Iron  

(b) Copper

(c) Aluminium                       

(d) Zinc

02: Aluminium oxide is: (LHR-14,15,18)(MLT-15,17)(RWP-15)(BWP-15)(SRG-17)

(a) Acidic oxide                     

(b) Basic oxide

(c) Amphoteric oxide             

(d) None of these

03: Chemical composition of colemanite is: (SRG-14)(BWP-17)(MLT-18,19)

(a) Ca2B6O11. 5H2O               

(b) CaB4O7. 4H2O

(c) Na2B4O7.4H2O                  

(d) CaNaB5O9.8H2O

04: Which element forms an ion with charge +3? (MLT-15)(SRG-15,22)(DGK-19)

(a) Beryllium                         

(b) Aluminium

(c) Carbon                             

(d) Silicon

05: Which electronic configuration corresponds to an element of group-IIIA of the periodic table?

(a) 1s2, 2s2, 2p6, 3s2, 3p1

(b) 1s2, 2s2, 2p6, 3s2, 3p6, 4s2

(c) 1s2, 2s2, 2p6

(d) 1s2, 2s2, 2p6, 3s2, 3p3

06: Which element among the followings belongs to group IVA of the periodic table? (LHR-16)(RWP-17)(FSL-19)(MLT-22)(DGK-22)

(a) Barium          

(b) Iodine           

(c) Lead 

(d) Oxygen

07: Boric acid can’t be used: (LHR-14,19)(BWP-14)(SRG-15)(AJK-16)(FSL-17)(GJR-18)

(a) As antiseptic in medicine

(b) For washing eyes

(c) In soda bottles

(d) For enamels and glazes

08: Which of the following elements is not present abundantly in earth crust? (LHR-17)(MLT-17,22)(SRG-18)(GJR-19)(FSL-19,22)

(a) Silicon                             

(b) Aluminium

(c) Sodium                            

(d) Oxygen

09: Tincal is mineral of: (FSL14,16)(MLT-14,16)(BWP-14,17,22)(LHR-16,22,22)(SWL-16)(GJR-17)(RWL-17,19,22)(SRG-19)(AJK-19)

(a) Al    

(b) B

(c) Si     

(d) C

10: The chief ore of aluminium is: (GJR-14,15)(RWL-14)(LHR-15,19)(SRG-15,16)(BWP-15,18)(FSL-16)(DGK-17,22)(SWL-18,19,22)

(a) Na3AlF6                            

(b) Al2O3. 2H2O

(c) Al2O3                               

(d) Al2O3. H2O

MCQs (Previous Boards Essentials)

Q. Each question has four possible answers. Tick the correct one.

01: Kaolin is a mineral of: (LHR-14)

(a) Carbon                                                        

(b) Magnesium

(c) Silicon                                                           

(d) Aluminium

02: The aqueous solution of borax is: (SWL-14)(GJR-15)(BWP-18)

(a) Acidic                                                            

(b) Alkaline

(c) Amphoteric                                             

(d) Neutral

03: Which is used in the leather industry? (SWL-14)(GJR-15)(BWP-18)

(a) Borax                                                              

(b) Boric acid

(c) Boric oxide                                             

(d) Tetraboric acid

04: Borax has the chemical formula: (BWP-17)

(a) KNO3                                                              

(b) NaNO3

(c) Na2B4O7.10H2O                                 

(d) Na2CO3.H2O

05: Aluminium reacts with nitrogen to form: (LHR-14)

(a) AlN  

(b) Al2N

(c) Al2N3

(d) Al4N6

06: Which of the followings is used in cosmetics? (DGK-15)

(a) Talc

(b) Asbestos

(c) Sodium sulphate                               

(d) Aluminium sulphate

07: Chemical formula of litharge is: (SRG-19)

(a) Pb2O

(b) SiO2  

(c) PbO 

(d) Pb3O4



Q.01: Why is boron a non-metal, while other members of this group are metals?

Q.02: How does Boron occur in nature?

Q.03: Why is aluminium not found in free state? (GJR-19)

Q.04: Write formulas of: (a) Koalin (b) Emerald (MLT-19)(SRG-19)(DGK-19)

Q.05: Write formulas of: (a) Kaolin (b) Feldspar (LHR-21)

Q.06: Write formulas of: (a) Colemanite (b) Cryolite (SRG-16)(LHR-18,19)(SRG-19)

Q.07: Write formulas of: (a) Corundum (b) Cryolite (BWP-21)

Q.08: Write formulas of the following minerals: (a) Mica (b) Bauxite (c) Gibbsite (d) Diaspore.

Q.09: Discuss peculiar behaviour of Boron among other members of its family? (LHR-21)


Q.10: What is borax? (GJR-19)

Q.11: How will you prepare borax form: (a) Boric acid (b) Colemanite (RWP-14)(DGK-14)

Q.12: Write two methods of preparation of borax. (BWP-21)

Q.13: Write equations to show how borax can be converted into boric acid by HCl and H2SO4(LHR-14,18)(MLT-15)(RWP-15,17)

Q.14: What happens when borax is heated with NH4Cl? (BWP-14)(GJR-21)

Q.15: Why is aqueous solution of borax alkaline in nature? (AJK-15)(LHR-15,16)(DGK-17,21)(SWL-18)

Q.16: What happens when borax is dissolved in water? (DGK-21)

Q.17: What is the action of an aqueous solution of borax on litmus? (RWP-17,21,22)

Q.18: Describe borax bead test. (MLT-22)

Q.19: What is borax bead test? Discuss its chemistry. (SWL-14,21)(DGK-17)(GJR-,15,17,21)(FSL-18)(RWP-19)(BWP-19,19,21)(MLT-21)(LHR-22)(AJK-22)

Q.20: Write four uses of borax. (GJR-14,15,21,21)(DGK-14,15,16,17,21)(MLT-15,18)(RWP-16,18)(LHR-19,21)(FSL-22)(BWP-22)

Q.21: How does borax serve as water softening agent? (FSL-19)(SRG-19)  Ex.Q.16(d).

Q.22: Write names and formulas of four oxyacids of boron. (LHR-14)(DGK-14,19)(BWP-17)(RWP-18)(FSL-19)(MLT-19,21)(AJK-21)

Q.23: Write the formulas of four boric acids. (MLT-22)

Q.24: How do other boric acids change into orthoboric acid?

Q.25: How is orthoboric acid prepared from: (a) Colemanite (b) Borax. (LHR-16)(GJR-19)(MLT-19)

Q.26: How boric acid can be prepared on commercial scale? (MLT-21)(GJR-22)            

Q.27: How does orthoboric acid react with: (a) Ethyl Alcohol (b) Na2CO3. (LHR-22)

Q.28: How does orthoboric acid react with: (a) Ethyl Alcohol (b) NaOH (LHR-14,15,17,19)(SWL-16)(BWP-17,18)(MLT-18)(GJR-18)(SRG-19)(DGK-21)

Q.29: What is the effect of heat on orthoboric acid? (GJR-15)(SRG-16,17,19)(RWP-17)(BWP-18)(FSL-19)(MLT-19)

Q.30: Convert boric acid into tetra boric acid. (FSL-21)

Q.31: How will you convert boric acid into borax and vice versa? (AJK-21)(GJR-21)(FSL-22)

Q.32: Orthoboric acid is a monobasic acid. Explain.

Q.33: Write down any two uses of boric acid. (SWL-21)(SRG-21,22)(FSL-21)(DGK-21)

Q.34: Give three uses of orthoboric acid. (AJK-15,19)(SWL-17)(SRG-17)(DGK-18,22)

Q.35: Why are borate glazes more fusible than silicate glazes? (LHR-19)


Q.36: Why are aluminium sheets said to be corrosion free? (MLT-17)(GJR-19)

Q.37: What is the use of aluminium in flash light photography? (AJK-19)(MLT-21)

Q.38: How is aluminium used to remove air bubbles from molten metals?

Q.39: Why is aluminium not suitable for marine use?

Q.40: How does Aluminium react with non-metals? Give any two reactions. (RWP-21)(AJK-22)

Q.41: How does Aluminium react with the following: (a) Cl2   (b) H2 (MLT-21)

Q.42: Aluminium is amphoteric. Explain. (FSL-19)

Q.43: How does Aluminium react with: (a) Acid (HCl) (b) Alkali (NaOH) (MLT-22)

Q.44: Write down the chemical reactions of aluminium with: (a) HCl (b) Cl2 (MLT-22)

Q.45: Give reactions of aluminium with dilute and concentrated H2SO4. (GJR-14)(SRG-16)(LHR-17)(DGK-18)(FSL-19)(AJK-19)

Q.46: Why is nitric acid frequently transported in aluminium containers?

Q.47: How does aluminium react with alkalies? (DGK-14)(BWP-15,19)(SRG-16)(MLT-18)

Q.48: Write four uses of aluminium. (SRG-16,22)(GJR-17,18)(MLT-18)(SWL-21)

Q.49: Why is aluminium used in transport industries?

Q.50: What is the use of aluminium as an excellent conductor?

Q.51: What is the use of aluminium as a good reflector of light?


Q.52: Give two similarities between carbon and silicon. (MLT-21)

Q.53: What is inert pair effect?

Q.54: Write some common properties of group IVA elements. (FSL-17)(GJR-18)(SRG-21)(DGK-22)

Q.55: Write formulas of analcite and zircon.

Q.56: Write formulas of following minerals of silicon: (i) Zircon (ii) Talc (DGK-22)

Q.57: Give occurrence of carbon in nature.

Q.58: How does silicon occur in nature?

Q.59: Briefly discuss the peculiar behaviour of carbon in its group. (FSL-14,15)(GJR-14,15,21)(SRG-17,18,21)(MLT-17)(AJK-21)(RWP-21)(DGK-21)

Q.60: What is catenation?

Q.61: Write names and formulas of the oxides of carbon.

Q.62: Describe the structure of CO. (MLT-15)(BWP-18)

Q.63: Describe the structure of CO2. (LHR-15)(MLT-15)(BWP-18)

Q.64: Why is CO2 molecule non-polar in nature? (SRG-15)(BWP-19)(FSL-22)

Q.65: Why is CO2 acidic in character? (RWP-15,22)(DGK-16)(SRG-19)(GJR-22)

Q.66: What is silica glass or vitreous silica? (LHR-18)(DGK-18)

Q.67: Write four properties of vitreous silica. (BWP-17)(DGK-19)

Q.68: Why is CO2 a gas while SiO2 a solid? (LHR-14,18,19)(RWP-14,17)(MLT-14,18,19)(SWL-14,22)(SRG-15)(AJK-16)(FSL-16,17)(GJR-19,19)

Q.69: What is the structure of CO2 and SiO2 and why they differ from each other? (GJR-22)

Q.70: What are silicates? Give one example. (RWP-19)

Q.71: What is water glass? How is it prepared?

Q.72: Give four uses of sodium silicate. (LHR-14,16)(FSL-14)(DGK-14,15)(AJK-16)(MLT-16,18)(SRG-18)(SWL-22)

Q.73: What is chemical garden? (LHR-14,17,18,19)(MLT-14)(DGK-14)(SWL-16,19)(GJR-18)(BWP-22)

Q.74: How does weathering phenomenon convert potassium feldspar into clay? (GJR-14)(SWL-19)

Q.75: Why do bricks and earthen wares turn reddish when baked?

Q.76: How are stone wares glazed?

Q.77: What is talc or soap stone? Give its uses. (BWP-14)(SWL-19)

Q.78: What is asbestos? Give its use. (DGK-16)(MLT-19)

Q.79: Give any four uses of silicates. (LHR-22)

Q.80: What are silicones? Give example. How are they prepared? (DGK-15)(RWP-19)

Q.81: Why are liquid silicones preferred over ordinary organic lubricants? (BWP-19)(FSL-14)(MLT-17)(RWP-18)(FSL-22)

Q.82: Give some important uses of silicones. (MLT-14)(LHR-14,22)(FSL-16)(SWL-17)(BWP-17,18)(AJK-19)(GJR-22)


Q.83: Define semiconductors. Which elements and compounds can act as semiconductors? Give examples. (RWP-14)(LHR-18)

Q.84: What is the effect of temperature on the conductivity of semiconductor? (DGK-22)

Q.85: Which property of semi-conductors makes them suitable for their use in solar cells?

Q.86: Draw the labelled diagram of photovoltaic cell (solar cell).

Q.87: How are semi-conductors used in transistors? (BWP-14)


Q.88: What is the importance of the oxides of lead in paints? (DGK-15)(BWP-17,18)(SWL-18)(GJR-18)(FSL-19)

Q.89: How is lead sub-oxide prepared?

Q.90: What is the formula of red lead? Give its principal uses. (MLT-18)(FSL-19)

Q.91: How is Pb3O4 formed and decomposed?

Q.92: Give preparation and properties of lead dioxide.

Q.93: What is white lead? Why is it not a good pigment? (RWP-16)(BWP-19)

Q.94: What is chrome yellow? What is its use? (GJR-14)(LHR-14)



Q.01: Discuss peculiar behaviour of Boron. (MLT-15)(DGK-22)(AJK-22)

Q.02: Discuss four points regarding the peculiar behaviour of Boron. (SRG-22)


Q.03: Write down two methods for the preparation of borax. (GJR-14,15)(LHR-15)(MLT-18)

Q.04: Also explain the action of heat on borax. (LHR-15)

Q.05: Give uses of borax. (DGK-15)

Q.06: Write eight uses of borax. (FSL-22)

Q.07: Explain: (i) Borax bead test with its chemistry. (ii) Discuss effect of heat on boric acid. (DGK-16)

Q.08: Give one method for the preparation of H3BO3. How does it react with C2H5OH, NaOH, Na2CO3? (DGK-16)(LHR-22)

Q.09: Write chemical reactions of H3BO3. (BWP-15)

Q.10: How will you convert boric acid into borax and vice versa? (RWP-16)


Q.11: How does aluminium reacts with: (i) Hydrogen (ii) Halogens (iii) Nitrogen (iv) HCl (MLT-22)

Q.12: Give reactions of aluminium with: (i) NaOH (ii) H2SO4 (iii) O2 (iv) HCl (DGK-22)

Q.13: How and under what conditions does aluminium react with: (i) O2 (ii) NaOH (iii) H2SO4 (iv) N2 (LHR-15)(AJK-16)(GJR-18)

Q.14: Write four uses of aluminium. (MLT-15)

Q.15: Write down eight uses of Aluminium. (RWP-22)

Q.16: Write applications of aluminium. (Any eight) (FSL-22)


Q.17: Why CO2 is a gas at room temperature and SiO2 is a solid? Explain. (RWP-15)

Q.18: Write a note on aluminium silicates. (SRG-15)(BWP-22)

Q.19: What are silicates? How sodium silicate is prepared? (LHR-22)

Q.20: What are silicones? Describe their properties and uses. (SWL-14,16)(AJK-15)(DGK-15)(SRG-15,16)(MLT-16,18,22)(RWP-18)


Q.21: Define semiconductors. Give examples. Write two properties and two uses of semiconductors. (FSL-16)(SWL-22)


Q.22: Discuss the importance of oxides of lead in paints. (MLT-16)(GJR-22)

Q.23: Discuss briefly triplumbic tetraoxide (Pb3O4) and lead dioxide (PbO2). (GJR-22)

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