The following compounds are given with their corresponding boiling points.
Compound Boiling Point
i.................................14°C
ii................................24°C
iii................................0°C
iv................................120°C
V.................................-2°C
From the above information, indicate which of the following is correct?

A. All the compounds are gaseous at 20 °C

B. One of the compounds is gaseous at 20 °C

C. Two of the compounds are gaseous at 20 °C

D. Three of the compounds are gaseous at 20 °C

E. None of the compounds is gaseous at 20 °C

The products of the reaction between dilute sulphuric acid and sodium thiosulphate crystals are?

A. Na₂SO₄ + SO₂ + O₂ + H₂O

B. Na₂SO₃ + SO₃ + O₂ + H₂O

C. Na₂SO₄ + SO₂ + S + H₂O

D. Na₂SO₄ + SO₃ + S + H₂O

E. Na₂SO₄ + SO₂ + H₂O only

Which of the following is NOT a true statement of the kinetic Theory of Gases?

A. The molecules move at random

B. The size of molecules is negligble as compared with the volume of gas

C. The molecular collisions are perfectly elastic

D. Every molecule has the same kinetic energy at a particular temperature

E. The average kinetic energy is proportional to the absolute temperature of the gas

The electronic configuration of elements X and Y are X = 2, 8, 6; Y = 2, 8, 7. The bond in the compound formed by X and Y is expected to be?

A. ionic

B. covalent

C. dative covalent

D. metallic

E. none of the above

5cm³ of a saturated solution of sodium chloride at 30°C gave, on careful evaporation, 1.95g of solid salt. The solubility of sodium chloride at 30°C?

(Na = 23, Cl = 35.5)

A. 5.00 mole dm³

B. 5.67 mole dm³

C. 6.00 mole dm³

D. 6.67 mole dm³

E. 7.00 mole dm³

In the extraction of iron, which of the following reactions does NOT take place in the blast furnace?

A. CO₂ + C → 2CO

B. 2Fe₂O₃ + 3C → 4Fe + 3CO₂

C. Fe₂O₃ + 3C → 2Fe + 3CO₂

D. CaCO₃ → CaO + CO₂

E. CaO + SiO₂ → CaSiO₃

Pure sulfuric acid is a liquid of 1.84 density. What volume of it would be required to prepare 250 cm3 of 2.0 M solution?



(H = 1, S = 32, O = 16)

A. 2.00

B. 2.66

C. 3.00

D. 3.66

E. 4.00

What mass of sodium carbonate solution is in 500 cm³ of 0.1 molar sodium carbonate solution?

(Na = 23, C = 12, O = 16)

A. 10.6 g

B. 5.3 g

C. 500 g

D. 10 g

E. 20 g

Which of the following compounds and elements would sublime on exposure to the atmosphere?

A. Ice

B. Sulphur

C. Phosphurous

D. Iodine

E. Potassium iodie

When hydrogen sulphide and sulphur dioxide are each passed in turn into a solution of potassium dichromate?

A. both gases change the colour of the solution from yellow to colourless

B. both gases causes sulphur to be deposited

C. only hydrogen sulphide decolourizes the solution

D. only sulphur dioxide deposits sulphur

E. only hydrogen sulphide deposits sulphur