THE WAY (CHEMISTRY)

1. Nuclear reactions can be used in the following except

Gauging the thickness of objects.

Making atomic bombs.

Curing cancer.

2. Real gases do not obey the ideal gas laws at

High temperatures.

Low temperatures and high pressures.

Low pressures.

High temperatures and pressures.

3. A mixture of solutions of barium chloride and sodium trioxocarbonate IV yields a white precipitate

Soluble in ammonia.

Soluble in dilute hydrochloric acid.

Soluble in alkali.

Soluble in dilute tetraoxosulphate (VI) acid.

4. Four solutions P, Q, R, and S contain chloride, suiphide, tetraoxosulphate (VI) and trioxocarbonate (IV) ions respectively. One reagent that will identify only one of them completely by a precipitation reaction is:

Potassium hydroxide solution.

Dilute tetraoxoxosulphate (VI) acid.

Dilute trioxonitrate (V) acid.

Lead trioxonitrateV solution.

5. Which of the following is TRUE of alkalis?

They have a sour taste.

They liberate ammonia when added 19 ammonium chloride.

Their pH is 7.

They turn phenolphthalein colourless.

6. The pH value of an aqueous solution of two compounds remains at 5 even when contaminated with small quantities of acid or alkali. Which one of the following pairs of compounds would produce such a solution?

Ammonia and ammonium chloride

Ethanoic acid and sodium ethanoate

Hydrochloric acid and sodium chloride

Potassium hydroxide and potassium bromide.

7. A 3.0 g mixture of sodium trioxocarbonate IV and calcium trioxocarbonate IV liberated 0.44 g of carbon IV oxide on strong heating until no more gas was evolved. What is the percentage of sodium trioxocarbonate IV in the mixture? [Ca=40,C=12,O=16, Na=23]

67

23

76

32

8. Which of the following planets contains a large amount of solid methane?

Jupiter

Neptune

Pluto

Saturn.

9. What change will occur during the electrolysis of brine using carbon electrodes?

Chlorine will be given off at the cathode.

Oxygen gas will be given off at the anode.

Sodium will be deposited at the cathode.

The volumes of hydrogen and chlorine given off during the same time are equal.

10. Which of the following is a good conductor of electric current?

Mixture of petrol and kerosene.

Aqueous solution of sugar

Mixture of ethanol and water

Aqueous solution of table salt.

The Way (Chemistry)