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- 1. Multiple Choice
When Lead Nitrate reacts with potassium iodide, Yellow precipitate of ............. is formed
PbI2
KNO3
Pb(NO3)2
PbIO3
- 2. Multiple Choice
Which of the following is not a chemical reaction?
Souring of milk
Dissolution of sugar in water
Rusting of iron
Digestion of food in our body
- 3. Multiple Choice
Which of the following is not a thermal decomposition reaction
2FeSO4 →Fe2O3 +SO2 + SO3
2H2O→2H2 + O2
ZnCO3→ZnO + CO2
2KClO3→2KCl + 3 O2
- 4. Multiple Choice
Combustion is an .................Process
Endothermic
Exothermic
Both (a) and (b)
None of the above
- 5. Multiple Choice
Which of the formula of rust is
Fe2O3
Fe3O4
Fe2O3.nH2O
Fe3O4.nH2O
- 6. Multiple Choice
Copper on exposure to air reacts with moisture and carbon dioxide to develop a green layer which is chemically
Basic Copper carbonate
Copper sulphate
Copper Nitrate
Copper Oxide
- 7. Multiple Choice
When dilute hydrochloric acid is added to granulated zinc placed in a test tube , the observation made is
The surface of the metal turns shinning
The reaction mixture turns milky
Greenish yellow gas is evolved
the colorless and odorless gas evolve
- 8. Multiple Choice
Which of the following is an example of displacement reaction?
2 KClO3→KCl + O2
2H2 + O2 →2 H2O
Zn + 2 HCl → ZnCl2 + H2
N2 + 3 H2 → 2 NH3
- 9. Multiple Choice
What will happen when we add iron nail into copper sulphate solution
Blue color of the solution fades
Reddish color appears on iron nail
Color of the solution turns green after some time
All of these
- 10. Multiple Choice
Burning of magnesium ribbon is a
Chemical reaction
Exothermic reaction
A white color powder forms
All of these
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