1. A
   (a) - (ii), (b) - (iii), (c) - (iv), (d) - (i)
2. B
   (a) - (i), (b) - (iii), (c) - (ii), (d) - (iv)
3. C
   (a) - (iii), (b) - (i), (c) - (ii), (d) - (iv)
4. D
   (a) - (iv), (b) - (ii), (c) - (iii), (d) - (i)

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1. A
   Carbon
2. B
   Phosphorus
3. C
   Sulphur
4. D
   Bromine

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1. A
   Potassium
2. B
   Lithium
3. C
   Sodium
4. D
   Gallium

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1. A
   PVC
2. B
   Sulphur
3. C
   All can be used
4. D
   Graphite

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1. A
   Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
2. B
   Statement 1 is true and statement 2 is false
3. C
   Both statements 1 and 2 are false
4. D
   Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.

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1. A
   an element
2. B
   a compound
3. C
   a heterogeneous mixture
4. D
   a homogeneous mixture

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1. A
   Mg
2. B
   Ag
3. C
   Cu
4. D
   Zn

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1. A
   1, 2 or 3
2. B
   5, 6 or 8
3. C
   3, 4 or 5
4. D
   5, 6 or 7

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1. A
   A metal used in joining electric wires - Magnesium
2. B
   A metal extracted by using electrolytic reduction - Aluminium
3. C
   A metal whose oxide is soluble in both acids and bases - Zinc
4. D
   A metal unreactive towards oxygen and dilute acids - Gold

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1. A
   Mercury and Bromine
2. B
   Bromine and Mercury
3. C
   Mercury and Iodine
4. D
   Iodine and Mercury

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1. A
   Iodine
2. B
   Nitrogen
3. C
   Sulphur
4. D
   Oxygen

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1. A
   Mg
2. B
   Fe
3. C
   Ca
4. D
   Na

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1. A
   It reacts only with acid and does not form water.
2. B
   It reacts with both acid as well as base to form salt and water.
3. C
   It reacts only with acid as well as base to form salt and hydrogen gas.
4. D
   It reacts only with base and does not form water.

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1. A
   Lead
2. B
   Magnesium
3. C
   Aluminium
4. D
   Lithium

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

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

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1. A
   All of these
2. B
   Water ($H_2O$)
3. C
   $C_2H_5OH$
4. D
   $H_2SO_4$

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1. A
   $CuCO_3$
2. B
   CuO
3. C
   $CuSO_4$
4. D
   $Cu(NO_3)_2$

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1. A
   calcium
2. B
   iron
3. C
   carbon
4. D
   silicon

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1. A
   Copper, Tin and Zinc
2. B
   Copper and Zinc
3. C
   Aluminium and Tin
4. D
   Copper and Tin

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1. A
   it is ductile
2. B
   it is sonorous
3. C
   it is malleable
4. D
   it is a good conductor of heat

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1. A
   Carbon, oxygen, nitrogen and sulphur
2. B
   Aluminium, carbon, oxygen and phosphorus
3. C
   Copper, oxygen, hydrogen and iodine
4. D
   Sulphur, oxygen, nitrogen and hydrogen.

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1. A
   Alcohol
2. B
   Water
3. C
   Ether
4. D
   Kerosene

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1. A
   Zinc
2. B
   Silver
3. C
   Lead
4. D
   Copper

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1. A
   Dil.HCl : Dil.$HNO_3$ -- 3 : 1
2. B
   Conc.HCl : Conc.$HNO_3$ -- 3 : 1
3. C
   Conc.HCl : Dil.$HNO_3$ -- 3 : 1
4. D
   Dil.HCl : Conc.$HNO_3$ -- 3 : 1

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