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

Dynamic equilibrium describes a situation where

A. a reaction gives back the reactant

B. te concentration of the reactant and products is equal

C. both forward and and reverse reactions proceed at the same rate

D. reactants are converted to products

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⁺

Which of the following pairs of substance will react further with oxygen to form a higher oxide?

A. CO₂ and H₂O

B. NO and H₂O

C. CO and CO₂

D. SO₂ and NO

The characteristic colour of the flame shown when a copper sail moistened with concentrated hydrochloric acid on a platinum wire is put on bunsen burner is

A. lilac

B. green

C. yellow

D. brick-red

In the industrial production of H₂ from natural gas the CO₂ produced along with the H₂ is removed by

A. washing under pressure

B. drying over phosphorus (V) oxide

C. passing the mixture into lime water

D. using ammonical copper (I) chloride