1. A
   $FeSO_4$ solution and silver metal
2. B
   $AgNO_3$ solution and copper metal
3. C
   $NaCl$ solution and copper metal
4. D
   $MgCl_2$ solution and aluminium metal.

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1. A
   They are more reactive than hydrogen.
2. B
   They are not reactive than hydrogen.
3. C
   They are less reactive than hydrogen.
4. D
   Non - metal being acceptors of electrons.

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

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1. A
   $Fe$
2. B
   $Ni$
3. C
   $Pt$
4. D
   $CO$.

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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
   Manufacturing of $NH_3$
2. B
   The solubility of $NH_3$ in $H_2O$
3. C
   The solubility of $NH_3$
4. D
   The solubility of $SO_2$ in water.

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1. A
   Copper is below hydrogen but above lead
2. B
   Iron is below lead and zinc
3. C
   Zinc is below magnesium but above aluminium
4. D
   Magnesium is below calcium but above aluminium.

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1. A
   $S$, $NaCl$, $HCl$ and $Pb$
2. B
   $HCl$, $S$, $NaCl$ and $Pb$
3. C
   $Pb$, $HCl$, $NaCl$ and $S$
4. D
   $S$, $HCl$, $Pb$ and $NaCl$.

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

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

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1. A
   $Cu_2S$
2. B
   $SiO_2$
3. C
   $CuSiO_3$
4. D
   $FeSiO_3$.

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1. A
   Ductility
2. B
   Malleability
3. C
   Conductivity
4. D
   Sonorous.

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1. A
   Flux
2. B
   Slag
3. C
   Gangue
4. D
   Mud.

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1. A
   zinc sulphate
2. B
   aluminium sulphate
3. C
   copper sulphate
4. D
   iron sulphate.

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1. A
   $H_2$ gas
2. B
   $O_2$ gas
3. C
   $CO$ gas
4. D
   $CO_2$ gas.

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1. A
   Turns green and no coating will be formed on the nail
2. B
   Turns green and a coating will be formed on the nail
3. C
   Remain blue and a coating is found on the nail
4. D
   Remain blue and no coating will be formed on the nail.

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1. A
   Insoluble impurities settle down at the bottom of the anode.
2. B
   The impure metal from the anode dissolves into the electrolyte.
3. C
   On passing the current through the electrolyte, the pure metal from the anode dissolves into the electrolyte.
4. D
   The pure metal from the electrolyte is deposited on the cathode.

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

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

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

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

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

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

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1. A
   Both the statements are true.
2. B
   Statement A is true; statement B is false.
3. C
   Statement A is false; statement B is true.
4. D
   Both the statements are false.

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