2021 JAMB Chemistry Past Questions

For this question, choose the option nearest in meaning to the word or phrase in italics. The scientist made an astonishing discovery in the laboratory.

1. A.common
2. B.amazing
3. C.expected
4. D.ordinary✓ Correct

Choose the option that best explains the information conveyed in the sentence The manager told his workers to call it a day.

1. A.They were told to continue working
2. B.They were told to intensify their efforts
3. C.They were told to stop working
4. D.They were told to pause for a few minutes✓ Correct

The amalgamation of the Northern and Southern protectorate of Nigeria took place on

1. A.A. 10 July, 1914
2. B.B. 1 January, 1921
3. C.C. 10 December, 1941✓ Correct
4. D.D. 1 January, 1914

The business risks of a public corporation are borne ultimately________

1. A.by the government
2. B.by the treasury✓ Correct
3. C.by the rate payers
4. D.by the tax payers

Import duty and tariffs is an instrument used for international trade restriction and so is __________?

1. A.Preferential duties
2. B.Preferential treatment
3. C.Entreport
4. D.Trade license✓ Correct

If x is positive real number, find the range of values for which $\frac{1}{3x}$ + $\frac{1}{2}$ > $\frac{1}{4x}$

1. A.x > -$\frac{1}{6}$
2. B.x > 0
3. C.0 < x < 6✓ Correct
4. D.0 < x <$\frac{1}{6}$

Simplify 125$^{−\frac{1}{3}}$ × 49$^{−\frac{1}{2}}$ × 10$^0$

1. A.$\frac{1}{35}$✓ Correct
2. B.$\frac{1}{350}$
3. C.350
4. D.35

What is the product of 2x2 − x + 1 and 3 − 2x

1. A.4x3 − 8x2 + 5x + 3
2. B.−4x3 + 8x2 − 5x + 3✓ Correct
3. C.−4x3 − 8x2 + 5x + 3
4. D.4x3 + 8x2 − 5x + 3

When the solute concentration of the cell and its surrounding medium are the same, the solution is said to be

1. A.hypertonic✓ Correct
2. B.hypotonic
3. C.isotonic
4. D.acidic

Which of the following was a major export commodity of the Oyo Empire during the pre-colonial period?

1. A.A. Ivory
2. B.B. Kola nuts
3. C.C. Salt✓ Correct
4. D.D. Gold