Jamb Chemistry 1991 Past Questions and Answers

Question 21:

• JAMB 1991

How many structural isomers can be written for the alkyl bromide, C₄H₉Br?

A. 3
B. 4
C. 6
D. 8

Question 22:

• JAMB 1991

What volume of CO₂ at s.t.p would be obtained by reacting trioxocarbonate (IV) with excess acid?
(G.M.V at s.t.p = 22.4 dm³)

A. 2.240 cm ³
B. 22.40 cm ³
C. 224.0 cm ³
D. 2240 cm ³

Question 23:

• JAMB 1991

If a current of 1.5 A is passed for 4.00 hours through a molten tin salt and 13.3g of tin is deposited, what is the oxidation state of the metal in the salt?
(Sn = 118.7, F = 96500 C mol^-1)

A. 1
B. 2
C. 3
D. 4

Question 24:

• JAMB 1991

Which of the following equimolar solutions, Na₂CO₃ Na₂ SO₄CI FeCI₃ CH₃COONa,
have pH greater than 7?

A. FeCI ₃ and NH ₄CI
B. Na₂CO₃, CH₃COONa and Na,Na₂SO₄
C. Na₂CO₃ and CH₃COONa
D. FeCI₃, CH₃COONa and NH₄CI

Question 25:

• JAMB 1991

MnO^-₄ + 8H⁺ + ne → Mn⁺⁺ + 4H₂O. Which is the value of n in the reaction above?

A. 2
B. 3
C. 4
D. 5