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

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1. A
   $\text{NH}_4\text{OH}$, $\text{Na}_2\text{CO}_3$, $\text{NaCl}$
2. B
   $\text{NaCl}$, $\text{CaCO}_3$, $\text{NH}_3$
3. C
   $\text{NaCl}$, $\text{NH}_4\text{OH}$, $\text{CaO}$
4. D
   $\text{NH}_3$, $\text{CaCl}_2$, $\text{CaCO}_3$.

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1. A
   Curd, Sodium hydroxide, milk of magnesia and coffee
2. B
   Vinegar, hydrochloric acid, milk of magnesia and coffee
3. C
   Lemon juice, milk, human blood and milk of magnesia
4. D
   Vinegar, hydrochloric acid, window cleaner and milk.

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1. A
   Unionised HCl
2. B
   $\text{Cl}^- + \text{OH}^-$
3. C
   $\text{H}_3\text{O}^+ + \text{Cl}^-$
4. D
   $\text{H}_3\text{O}^+ + \text{OH}^-$.

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1. A
   Potassium hydroxide
2. B
   Magnesium hydroxide
3. C
   Ammonium hydroxide
4. D
   Calcium hydroxide.

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1. A
   I and IV
2. B
   II and III
3. C
   III and IV
4. D
   I and II.

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1. A
   tartaric acid
2. B
   oxalic acid
3. C
   methanoic acid
4. D
   acetic acid.

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1. A
   violet
2. B
   green
3. C
   red
4. D
   blue.

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1. A
   Hydrochloric acid
2. B
   Nitric acid
3. C
   Phosphoric acid
4. D
   Sulphuric acid.

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

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1. A
   $\text{CO}_2$
2. B
   $\text{CO}$
3. C
   $\text{O}_2$
4. D
   $\text{NO}$.

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1. A
   basic indicator
2. B
   acid - base indicator
3. C
   olfactory indicator
4. D
   artificial indicator.

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1. A
   calcium carbonate
2. B
   calcium
3. C
   calcium bicarbonate
4. D
   calcium chloride.

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1. A
   $2\text{NaOH} + \text{Zn} \to \text{NaZnO}_2 + \text{H}_2$
2. B
   $2\text{NaOH} + \text{Zn} \to \text{Na}_2\text{ZnO}_2 + \text{H}_2$
3. C
   $2\text{NaOH} + \text{Zn} \to \text{Na}_2 + \text{ZnO}_2 + \text{H}_2\text{O}$
4. D
   $\text{NaOH} + \text{Zn} \to \text{NaZnO}_2 + \text{H}_2\text{O}$.

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1. A
   Option (c)
2. B
   Option (b)
3. C
   Option (a)
4. D
   Option (d).

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1. A
   hydrogen gas at the anode and chlorine gas at the cathode
2. B
   chlorine and hydrogen gas at the cathode
3. C
   hydrogen and chlorine gas at the anode
4. D
   chlorine gas is formed at the anode and hydrogen gas at the cathode.

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1. A
   0
2. B
   4
3. C
   10
4. D
   7.

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1. A
   olfactory indicator
2. B
   artificial indicator
3. C
   natural indicator
4. D
   self indicator.

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1. A
   $\text{H}_2\text{SO}_4$ and KOH
2. B
   $\text{HNO}_3$ and NaOH
3. C
   HCl and $\text{NH}_4\text{OH}$
4. D
   $\text{CH}_3\text{COOH}$ and NaOH.

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1. A
   A is strongly acidic and B is a weak acid.
2. B
   A has pH less than 7 and B has pH greater than 7.
3. C
   A is strongly basic and B is a weak base.
4. D
   A has pH greater than 7 and B has pH less than 7.

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1. A
   Oxidation
2. B
   Reduction
3. C
   Dehydration
4. D
   Hydration.

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

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1. A
   HCl
2. B
   Lemon Juice
3. C
   Ethanoic acid
4. D
   Sodium bicarbonate.

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1. A
   Spinach
2. B
   Curd
3. C
   Ascorbic acid
4. D
   Ant's sting.

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1. A
   5
2. B
   3
3. C
   7
4. D
   8.

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