Choose the most appropriate answer from the options given below :

(a) a mixture of sand and ammonium chloride can be separated by

(i) filtration

(ii) distillation

(iii) sublimation

(iv) crystallisation

(b) A pair of metalloids are

(i) Na and Mg

(ii) B and Si

(iii) C and P

(iv) He and Ar

(c) Which of the following property is not shown by compounds ?

(i) They are heterogeneous.

(ii) They are homogeneous.

(iii) They have definite molecular formulae.

(iv) They have fixed melting and boiling points.

(d) A solvent of Iodine is

(i) Water

(ii) Kerosene oil

(iii) Alcohol

(iv) Petrol

(e) Which of the gas is highly soluble in water ?

(i) Ammonia

(ii) Nitrogen

(iii) Carbon monoxide

(iv) Oxygen

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Solution

(a) a mixture of sand and ammonium chloride can be separated by
1. ltration
2. distillation
3. sublimation
4. crystallisation(b) A pair of metalloids are
1. Na and Mg
2. B and Si
3. C and P
4. HeandAr
(c) Which of the following property is not shown by compounds?
1. They are heterogeneous.
2. They are homogeneous.
3. They have de nite molecular formulae.
4. They have xed melting and boiling points.
(d) A solvent of Iodine is
1. Water
2. Kerosene oil
3. Alcohol
4. Petrol
(e) Which of the gas is highly soluble in water ?
1. Ammonia
2. Nitrogen
3. Carbon monoxide
4. Oxygen

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