1. A
   Remain blue
2. B
   Change to colourless
3. C
   Change to bluish
4. D
   Change to green

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

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1. A
   $Ag_2O$
2. B
   $Ag_3N$
3. C
   $Ag_2S$ and $Ag_3N$
4. D
   $Ag_2S$

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1. A
   Zinc is costlier than tin.
2. B
   Zinc has a higher meltingpointthan that of tin.
3. C
   Zinc is more reactive than tin.
4. D
   Zinc is less reactive than tin.

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1. A
   $Al_2O_3$
2. B
   Al
3. C
   $MnO_2$
4. D
   Mn

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1. A
   No reaction takes place.
2. B
   Copper chloride formed.
3. C
   Zinc sulphate formed.
4. D
   Copper sulphate formed.

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

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1. A
   $H_2SO_4$
2. B
   $H_2SO_3$
3. C
   $SO_3$
4. D
   $SO_2$

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1. A
   Silver
2. B
   Gallium
3. C
   Zinc
4. D
   Aluminium

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1. A
   conductivity
2. B
   malleability
3. C
   ductility
4. D
   sonorousity

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1. A
   $Mg, MgO$
2. B
   $Al, Al_2O_3$
3. C
   $Fe, Fe_2O_3$
4. D
   $Mn, MnO_2$

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1. A
   In the absence of water
2. B
   In the presence of water
3. C
   In the absence of air
4. D
   In the presence of air

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1. A
   $Fe_2O_3$ and $Fe_3O_4$
2. B
   FeO
3. C
   $Fe_2O_3$
4. D
   $Fe_3O_4$

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1. A
   Both $H_2$ and $NH_4Cl$
2. B
   $H_2$ gas is evolved
3. C
   $NH_4Cl$ is formed
4. D
   $Cl_2$ gas is evolved.

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1. A
   Neither A nor B is a metal
2. B
   Both A and B are metals
3. C
   A is metal
4. D
   B is metal

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1. A
   Silica
2. B
   Haematite
3. C
   Calcined dolomite
4. D
   Copper sulphate

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1. A
   Brass
2. B
   Steel
3. C
   Bronze
4. D
   Amalgam

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1. A
   All of these
2. B
   Absorb moisture
3. C
   Kill germs
4. D
   To clean the bottle

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1. A
   Calcium and phosphorus respectively
2. B
   Sodium and phosphorus respectively
3. C
   Phosphorus and sodium respectively
4. D
   Magnesium and sodium respectively

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1. A
   Hydrogen gas
2. B
   All of these
3. C
   Helium gas
4. D
   Nitrogen gas

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1. A
   Gold and silver
2. B
   Gold and platinum
3. C
   Copper and silver
4. D
   Platinum and silver

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1. A
   Cuprous oxide
2. B
   Cupric oxide
3. C
   Copper carbonate
4. D
   Copper sulphate

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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
   Al
2. B
   Pb
3. C
   Sn
4. D
   Ag

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1. A
   Sodium
2. B
   Potassium
3. C
   copper
4. D
   Zinc

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