One of the following techniques can be used to show that chlorophyll pigment is a mixture of chemical compounds and not a single coloured compound

A. cystallization

B. hydrolysis

C. sublimation

D. filtration

E. chromatography

A gas occupies 30.0 dm³ at S.T.P. What volume would it occupy at 91^oC and 380 mm Hg?

A. 0dm³

B. 40.0dm³

C. 0dm³

D. 0dm³

E. 0dm³

When excess ethanol is heated to 145 ^oC in the presence of concentrated sulphuric acid, the product is

A. diethyl ether

B. ethyne

C. diethyl sulphate

D. acetone

E. ethanoic acid

Which of the following raw materials would be required from the smelting of iron ore in a blast furnace?

A. CaCO ₃

B. Zn(NO₃)₂

C. CuSO₄

D. AICI₃

E. CaSO₄

A piece of metal (M) is dissolved in nitric acid and the resulting solution is treated with a small quantity of sodium hydroxide to produce a white precipitate (B) which redissolves on the addition of excess alkali. The precipitate (B)when ignited in a crucible produces the oxide of the metal(m). The METAL M is

A. Zn

B. Cu

C. Al

D. Au

E. Ca

Pick out the correct statement

A. Zin heated to redness reacts with steam to give oxygen and zinc oxide

B. Zinc heated to redness reacts with steam to give oxygen and hydrogen

C. Zinc does not react with hot or cold water

D. Zinc reacts with hot water to form zinc oxide and hydrogen

E. Zinc reacts very easily with cold water to give zinc oxide and hydrogen

Consider the following exothermic reaction 2SO₂(g) + O₂(g) = 2SO₃ (g) . If the temperature of the reaction is reduced from 800_oC to 500_oC, and no other change takes place, then

A. the reaction rate increases

B. concentration of SO₃ decreases

C. concentration of SO₃ increases

D. SO₂ gas becomes unreactive

E. O₂ gas becomes unreactive

The IUPAC name for

A. 2-methylbut-3-ene

B. 2-methylbut-4-ene

C. 3-methylbut-2-ene

D. 3-methylbut-1-ene

E. 3-methylpent-1-ene

Which of the structural formal above is ethanoic acid is

A. A

B. B

C. C

D. D

E. E