Bits
1. If a substance formed in the reaction is gas, it is indicated by
A) 
B) 
C) 
D) 
2. If a substance is precipitated in the reaction, it is indicated by
A) 
B) 
C) 
D) 
3. Select the correct balanced chemical equation of the following
A) N2 + 3 H2 
2 NH3 B) H2 + Cl2 
HCl
C) AgCl 
Ag + Cl2 D) CuO + H2 
2 Cu + H2O
4. Select the incorrect balanced chemical equation of the following.
A) 4 NH3 + Cl2 
N2H4 + 2 NH4Cl B) NH3 + 3 Cl2 
NCl3 + 3 HCl
C) 8 NH3 + 3 Cl2 
6 NH4Cl + N2 D) 2 NH3 + 3 Cl2 
2 NCl3 + 3 HCl
5. CaO reacts with water to form
A) CaCO3 B) CaOH C) Ca(OH)2 D) CaCl2
6. A white precipitate will be formed if we add common salt solution to
A) Ba(NO3)2Solution B) KNO3 Solution
C) AgNO3 Solution D) Mg(NO3)2 Solution
7. AgNO3 + NaCl 
A) AgCl + NaNO3 B) AgCl + Na2NO2
C) AgCl2 + NaNO2 D) Ag2Cl + NaNO3
8. After white washing the walls appear to be white due to the formation a layer of ..... This layer is formed by the reaction Calcium hydroxide solution (lime water) with CO2 in air
A) Gypsum B) Limestone C) Plaster of Paris D) Bleaching powder
9. "Water added to quick lime" this reaction is
A) Photochemical reaction B) Photo reaction
C) Exothermic reaction D) Endothermic reaction
10. During a chemical change, the following change takes place
A) Products are changed into reactants
B) Reactants give the products
C) Atoms of one element change into atoms of another element
D) Properties of products are almost similar to those of the reactants.
11. One of the following does not take place during a chemical reaction
A) Atoms rearrange to give the products
B) New substances form, having different properties
C) Atoms of one element change into atoms of another element
D) Old bonds break and new bonds form
12. Gram Molar Volume is
A) 2.24 l B) 2.24 ml C) 22.4 l D) 22.4 ml
13. Avagadro's number is
A) 6 × 1010 B) 6 × 1024 C) 6.02 × 1023 D) 6.02 × 1034
14. Nitrogen combines with Hydrogen to give Ammonia, the balanced equation is
A) N2 + H2 
NH3 B) N + H3 
NH3
C) N2 + 3 H 
NH3 D) N2 + 3 H2 
2 NH3
15. The substances that are present on right side of a chemical equation are called
A) reactants B) products C) oxidants D) reductants
16. The arrow mark between the products and reactants of a chemical equation shows of the reaction
A) Combination B) Decomposition C) Displacement D) Direction
17. When 3 grams of Mg reacts with excess of dil HCl, the weight of H2 liberated is (at. wt of Mg = 24)
A) 0.2 gram B) 0.25 gram C) 0.5 gram D) 1 gram
18. 3 gram of Carbon is completely burnt in large excess of Oxygen, the weight of CO2 formed is
(At. wt of O = 16, At. wt of C = 12)
A) 7 gram B) 11 gram C) 14 gram D) 17 gram
19. Calculate the amount of Aluminium required to the reduction of Fe2O3 to get 1120 kg of Iron (At.wt of Al = 27, At.wt of Fe = 56)
A) 54 kg B) 104 kg C) 540 kg D) 560 kg
20. Calculate the mass of Hydrogen liberated when 230 grams of Sodium reacts with excess of water (At. wt of Na = 23)
A) 1 gram B) 23 gram C) 10 gram D) 5 gram
21. Calculate the volume of Hydrogen liberated when 230 gram of Sodium reacts with excess of water at STP (At.wt of Na = 23)
A) 22.4 litre B) 44.8 litre C) 112 Litre D) 224 Litre
22. Calculate the number of molecules of Hydrogen liberated when 230 gram of Sodium reacts with excess of water (At.wt. of Na = 23)
A) 6.02 × 1023 B) 6.02 × 1024 C) 3.01 × 1023 D) 3.01 × 1024
23. In the equation CH4 + 2 O2CO2 + 2 H2O the amount of Oxygen needed to burn 4 gram of Methane completely is
A) 4 gram B) 8 gram C) 16 gram D) 32 gram
24. While writing chemical equation, if the reaction is exothermic the energy released is expressed by the sign
A) + B) − C) × D) ÷
25. While writing chemical equation if the reaction is endothermic the energy absorbed is expressed by the sign
A) + B) − C) × D) ÷
26. N2 + 3 H2 2 NH3 + 22.4 k.cal; is an example for ....... reaction.
A) Exothermic B) Endothermic C) Neutral D) None
27. N2 + O2 2 NO - 43.2 k.cals is an example for ........ reactions.
A) Exothermic B) Endothermic C) Neutral D) None
28. Downward arrow ( ) in a chemical equation indicates
A) Precipitate B) Direction C) Gas D) None
29. Barium chloride solution and Sodium sulphate solution respectively appear as ....
A) Both colourless B) White and colourless
C) Colourless and white D) Green and yellow
30. On mixing aqueous solutions of Barium chloride and Sodium sulphate we observe that.......
A) A White precipitate is formed immediately
B) A transparent solution is formed
C) A colourless gas is evolved
D) A pungent smelling gas evolves with brisk effervescence.
31. Choose the balanced equation
A) 2 Zn + H2SO4 2 ZnSO4 + H2 B) AgNO3 + 2 NaCl AgCl2 + 2 NaNO3
C) 2 Na + 2 H2O 2 NaOH + H2 D) C3H8 + 6 O2 3 CO2 + 4 H2O
32. 2 NaCl + 2 H2O ....... + Cl2 + H2
A) Na2H2 B) Na2OH C) 2 NaOH D) Na(OH)2
33. Zn + 2 AgNO3 ....... + 2 Ag ( )
A) Zn (NO3)4 B) ZnNO3 C) 2 ZnNO3 D) Zn(NO3)2
Ans: 30-A; 31-C; 32-C; 33-D;
34. If the chemical equation K2Cr2O7 K2CrO4 + Cr2O3 + O2 is balanced then
A) 2 K2Cr2O7 2 K2CrO4 + 2 Cr2O3 + 2 O2
B) 4 K2Cr2O7 4 K2CrO4 + Cr2O3 + 3 O2
C) 2 K2Cr2O7 2 K2CrO4 + 3 Cr2O3 + 3 O2
D) 4 K2Cr2O7 4 K2CrO4 + 2 Cr2O3 + 3 O2
35. Select the correct balanced chemical equation of the following
A) 2 NaOH + 2 Zn Na2ZnO2 + H2
B) 2 Na2CO3 + 2 HCl 2 NaCl + H2O + CO2
C) 2 HCl + Zn ZnCl2 + H2
D) C3H8 + 2 O2 3 CO2 + 4 H2O
Ans: 1-D; 2-C; 3-A; 4-D; 5-C; 6-C; 7-A; 8-B; 9-C; 10-B; 11-C; 12-C; 13-C; 14-D; 15-B; 16-D; 17-B; 18-B; 19-C; 20-C; 21-C; 22-D; 23-C; 24-A; 25-B; 26-A; 27-B; 28-A; 29-A; 34-D; 35-C.
