JAMB Chemistry Past Questions & Answers - Page 120

596.

Equilibrium is said to be attained in reversible reaction when

A.

all the reactants have been used up

B.

all the products have been formed

C.

there is no further change in temperature

D.

the rates of the forward and backward reactions are equal

E.

the rate of formation of the products decreases with time

Correct answer is D

No explanation has been provided for this answer.

597.

Z in diagram above represents

A.

heat of reaction

B.

activation energy

C.

free energy

D.

entropy of reaction

Correct answer is A

No explanation has been provided for this answer.

598.

In the diagram, the function of the concentrated H2SO4 is to?

A.

purify the gas

B.

dry the gas

C.

liquefty the gas

D.

remove odour

Correct answer is B

Concentrated sulphuric acid is a very effective drying agent. The chlorine obtained as the product from the above reaction contains traces of water vapour, and hydrogen chloride (HCl) vapours. HCl vapours are removed by passing the gas through water, and the traces of water vapour are removed by passing through conc.sulphuric acid.

599.

The IUPAC nomenclature of the compound above is

A.

2-bromo-3-chlorobutanol

B.

3-bromo-2-chlorobutanol

C.

3-chloro-2-bromobutanol

D.

2-chloro-3-bromobutanol

Correct answer is B

No explanation has been provided for this answer.

600.

The compound above is an

A.

alkanone

B.

alkanoate

C.

alkanal

D.

akanol

Correct answer is A

No explanation has been provided for this answer.