Which of the following can be added to dissolve the precipitate formed in the reaction represented by the following equation? CaCl_2(aq) + H₂C₂O _4(s) ⇌ CaC ₂O₂

A. Calcium chloride solution

B. Concentrated hydrochloric acid

C. Ethanol

D. Ethanedioc acid

E. Aqueous ammonia

The spontaneity of a chemical reaction is determined by the change in the

A. concentration of the reactants

B. temperature of the system

C. free energy of the system

D. pressure applied to the system

E. volume of the reactants

Two metallic ions commonly present in hard water are

A. Ca²⁺ and Zn²⁺

B. Cu²⁺ and Na⁺

C. Mg²⁺ and Ca²⁺

D. Fe²⁺ and Na⁺

E. Zn²⁺ and Cu²⁺

Rusting of iron is an example of

A. deliquescence

B. decomposition

C. displacement reaction

D. redox reaction

E. reversible reaction

Aluminium is extracted from

A. magnetite

B. cryolite

C. bauxite

D. cassiterite

Metals are said to be malleable because they

A. are good conductors heat

B. are good conductors of electricity

C. can be beaten into sheets

D. can be alloyed

E. can be polished

A device used in the laboratory for intermittent production of gases without heating is

A. Leibing condenser

B. aspirator

C. delivery tube

D. inverted funnel

E. Kipp's apparatus

Which of the following can undergo both addition reactions and substitution reactions?

A. Benzene

B. Pentane

C. Propene

D. Hexane

E. Ethene

The liquid product of the destructive distillation of coal is

A. kerosene

B. ethanol

C. ammoniacal liquor

D. paraffin oil

E. aqueous ammonia

Which of the following alkanes has the highest boiling point?

A. pentane

B. ethane

C. propane

D. butana

E. hexane