UTME Chemistry 1991 JAMB Past Questions and Answers, Jamb, Pre-degree, Nursing, Waec, Neco

UTME Chemistry 1991 JAMB Past Questions and Answers

1. Which of the following compounds can exist as geometric isomers?

Options

A) 2-methylbut-2ene

B) But-2-ene

C) But-1-ene

D) CI-C-Br

The correct answer is B.

2. How many grams of bromine will be required to completely react with 10 g of propyne?(C = 12, H = 1, Br = 80)

Options

A) 20 g

B) 40 g

C) 60 g

D) 80 g

The correct answer is D.

Explanation:

C₃H₄ + 2Br₂ – C₃Br₄ + 2H₂
(36 + 4) (4 X 80)
40 g of C₃H₄ reacts with 320 g of Br
10 ” ” will react with
(10)/(40) x (320) /(1) = 80g

3. Ethene when passed into concentrated H₂SO₄ is rapidly absorbed. The product is diluted with water and then warmed to produce?

Options

A) ethanol

B) diethyl ether

C) ethanal

D) diethyl sulphate

The correct answer is A.

4. One advantages of detergents over soap is that detergents?

Options

A) are easier to maufacture

B) foam more than soap

C) form soluble salts with hard water

D) are able to deter germs more than soap

The correct answer is C.

5. Which of the following salts can be melted without decomposition?

Options

A) Na₂CO₃

B) CaCO₃

C) MgCO₃

D) ZnCO₃

The correct answer is A.