1. A
   $\text{Fe}_2\text{O}_3 + 3\text{CO} \to 2\text{Fe} + 3\text{CO}_2$
2. B
   $\text{C}_2\text{H}_4 + \text{H}_2 \to \text{C}_2\text{H}_6$
3. C
   $\text{Cu} + \text{AgNO}_3 \to \text{Cu(NO}_3)_2 + 2\text{Ag}$
4. D
   $\text{NH}_4\text{Cl} \to \text{NH}_3 + \text{HCl}$

Tap an option to check your answer.

1. A
   Decomposition of vegetable matter into compost
2. B
   Dissolution of ammonium chloride in water
3. C
   Digestion of food in our body
4. D
   Formation of slaked lime

Tap an option to check your answer.

1. A
   B and C
2. B
   A and D
3. C
   All of these
4. D
   A and C

Tap an option to check your answer.

1. A
   Burning of a candle.
2. B
   Process of respiration.
3. C
   Decomposition of vegetable matter into compost.
4. D
   Decomposition of calcium carbonate to form quick lime and carbon dioxide.

Tap an option to check your answer.

1. A
   the reactants interchange their ions to form two new compounds
2. B
   All of these
3. C
   a precipitate is formed
4. D
   two new compounds are formed

Tap an option to check your answer.

1. A
   displacement reaction
2. B
   double displacement reaction
3. C
   combination reaction
4. D
   decomposition reaction

Tap an option to check your answer.

1. A
   Highly exothermic with a hissing sound
2. B
   Endothermic with a hissing sound
3. C
   Neither endothermic nor exothermic and no sound is produced
4. D
   Exothermic with no sound

Tap an option to check your answer.

1. A
   Smooth and shiny
2. B
   Rough and granule
3. C
   Soft and dull
4. D
   Hard and flaky

Tap an option to check your answer.

1. A
   Gypsum
2. B
   Quick lime
3. C
   Plaster of Paris
4. D
   Lime Stone

Tap an option to check your answer.

1. A
   (iii) only
2. B
   (ii) and (iv)
3. C
   (i) and (iii)
4. D
   (ii) only

Tap an option to check your answer.

1. A
   Green
2. B
   Colourless
3. C
   Blue
4. D
   Pale green

Tap an option to check your answer.

1. A
   Displacement reaction
2. B
   Decomposition reaction
3. C
   Combination reaction
4. D
   Double - decomposition reaction

Tap an option to check your answer.

1. A
   Zinc oxide
2. B
   Sodium hydroxide
3. C
   Calcium hydroxide
4. D
   Sodium sulphate

Tap an option to check your answer.

1. A
   (i) and (ii) only
2. B
   (i), (ii) and (iv)
3. C
   (i), (ii) and (iii) only
4. D
   (ii) and (iii) only

Tap an option to check your answer.

1. A
   1:1
2. B
   1:2
3. C
   4:1
4. D
   2:1

Tap an option to check your answer.

1. A
   $\text{H}_2\text{O}$
2. B
   $\text{H}_2$
3. C
   CuO
4. D
   Cu

Tap an option to check your answer.

1. A
   $\text{Fe}_2\text{O}_3$, Fe
2. B
   CO, $\text{CO}_2$
3. C
   Fe, CO
4. D
   CO, $\text{Fe}_2\text{O}_3$

Tap an option to check your answer.

1. A
   Ammonia
2. B
   Quick lime
3. C
   Lime stone
4. D
   Slaked lime

Tap an option to check your answer.

1. A
   Double displacement reaction
2. B
   Combination reaction
3. C
   Displacement reaction
4. D
   Decomposition reaction

Tap an option to check your answer.

1. A
   Silver chloride turns black
2. B
   Silver chloride turns grey
3. C
   Silver chloride turns blue
4. D
   Silver chloride show no change

Tap an option to check your answer.

1. A
   $\text{H}_2\text{S}$ is reduced to sulphur.
2. B
   $\text{SO}_2$ is oxidised to sulphur.
3. C
   $\text{SO}_2$ is oxidising agent and $\text{H}_2\text{S}$ is reducing agent.
4. D
   $\text{H}_2\text{S}$ is oxidising agent and $\text{SO}_2$ is reducing agent.

Tap an option to check your answer.

1. A
   Burning of coal
2. B
   Decomposition of calcium carbonate to form quick lime and carbon dioxide.
3. C
   Decomposition of vegetable matter into compost
4. D
   Process of respiration

Tap an option to check your answer.

1. A
   (ii) and (iii)
2. B
   (i) and (iii)
3. C
   (iii) and (iv)
4. D
   (ii) and (iv)

Tap an option to check your answer.

1. A
   2, 3
2. B
   2, 4
3. C
   1, 2
4. D
   1, 4

Tap an option to check your answer.

1. A
   brown deposit
2. B
   green deposit
3. C
   grey deposit
4. D
   blue deposit

Tap an option to check your answer.