CHEMISTRY MOCK

The raw materials used for the smelting of iron ore in a furnace is

• A. CaSO₄

• B. CaCO₃

• C. CuSO₄

• D. Zn(NO₃)₂

On heating, which of the following compounds will decompose to the free metal, nitrogen (IV) oxide and oxygen?

• A. Ca(NO₃)₂

• B. Cu(NO₃)₂

• • C. AgNO₃

• D. NaNO₃

The group IA metals are not found free in nature because they

• A. are very reactive and unstable

• B. are malleable and ductile

• C. have high melting and boiling point

• D. conduct heat and electricity

Carbon exist naturally in the combined state as

• A. graphite

• B. coal

• C. diamond

• D. wood

The efficiency of a solid catalyst to increase reaction rates depends on its

• A. surface area

• B. solubility

• C. concentration

• D. quantity

The ion that will give a white precipitate with aqueous NaOH and soluble in excess of the base is

• A. Ca²⁺

• B. Mg²⁺

• C. Zn²⁺

• D. Cu²⁺

Nigerian crude oil is described as light crude because of its

• A. low sulphur content

• B. high natural gas content

• C. high octane number

• D. low aliphatic-hydrocarbon content

The products of the combustion of candle wax are

• A. hydrogen and water

• B. oxygen and water

• C. carbon (iv) oxide and water

• D. carbon (ii) oxide and water

The isomer for natural rubber is

• A. 2-cholro-buta-1, 3-diene

• B. 2-methyl-1, 3-butadiene

• C. 3-methyl-buta-1, 2-diene

• D. 2-methyl-isoprene-buta-1, 3-diene

The volume of 2.5 moles of oxygen at s.t.p is
[Molar volume of a gas at s.t.p = 22.4 dm³]

• A. 50.0 dm³

• B. 84.0 dm³

• C. 28.0 dm³

• D. 56.0 dm³