1. A solution is prepared by addition of 10 g salt in
100 g water. To make the concentration of the
solution 15% (w/w), the amount of salt added to the
solution is approximately
(1) 5.8 g (2) 5.0 g
(3) 6.9 g (4) 7.6 g
2. Which of the following colloids does not have the
same dispersion medium as that in the remaining
three?
(1) Milk of Magnesia (2) Mud
(3) Butter (4) Milk
3. A gas jar contains 10 g of oxygen gas. In which
condition, the interparticle space between oxygen
molecules would decrease?
(1) Removal of 5 g gas from gas jar
(2) Decreasing pressure
(3) Addition of more oxygen gas to the same gas jar
(4) Transferring gas to another gas jar having double
volume
4. Which of the following is not an element?
(1) Diamond (2) Brass
(3) Mercury (4) Sulphur

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