Jamb Chemistry Past Questions and Answers

Question 676:

• JAMB 1991

Which of the following are mixtures?
i, Petroleum
ii, Rubber latex
iii. Vulcanizer's solution
iv, Carbon (II)sulphide

A. I, ii and iii
B. I, ii and iv
C. I and ii only
D. I and iv

Question 677:

• JAMB 1991

An iron ore is known to contain 70.0% Fe₂O₃. The obtain from 80kg of the ore is?
(Fe = 56, O = 16)

A. 35.0 kg
B. 39.2 kg
C. 70.0 kg
D. 78.4 kg

Question 678:

• JAMB 1991

In two separate experiments, 0.36g and 0.71g of chlorine combined with a metal X to give Y and Z respectively. An analysis showed that Y and Z contain 0.20g and 0.40g of X respectively. The data above represents the law of ?

A. Multiple proportion
B. Conservation of mass
C. Constant composition
D. Reciprocal proportion

Question 679:

• JAMB 1991

30cm\(^3\) of oxygen at 10 atmospheres pressure is placed in a 20 cm\(^3\) container. Calculate the new pressure if temperature is kept constant?

A. 6.7 atm
B. 15.0 atm
C. 60.0 atm
D. 66. 0 atm

Question 680:

• JAMB 1991

Calculate the volume of carbon (IV)oxide measured at s.t.p, produced when 1 kg of potassium hydrogen trioxocarbonate (IV) is totally decomposed by heat?
(G.M.V. at s.t.p 22.4 dm³, K = 39, O = 16, C = 12, H = 1)

A. 28 dm³
B. 56 dm³
C. 112 dm³
D. 196 dm³