Jamb Chemistry 1991 Past Questions and Answers

Question 6:

• 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 7:

• 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

Question 8:

• JAMB 1991

A given quantity of a gas occupies a volume of 228 cm³ at a pressure of 750mm Hg. What will be its volume at atmospheric pressure?

A. 220 cm³
B. 225 cm³
C. 230 cm³
D. 235 cm³

Question 9:

• JAMB 1991

A sample of a gas exerts a pressure of 8.2 atm when confined in a 2.93 dm³ container at 20°C. The number of moles of gas in the sample is?
(R = 0.082 litre atm / deg mole)

A. 1.00
B. 2.00
C. 3.00
D. 4.00

Question 10:

• JAMB 1991

Atoms of element X (with 2 electrons in the outer shell). combine with atoms of Y (with 7 electrons in the outer shell). Which of the following statements is FALSE? The compound formed?

A. Has formula XY
B. Is likely to be ionic
C. Contains X²⁺ ions
D. Contains Y^- ions