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2022 - JAMB Chemistry Past Questions and Answers - page 3

21

Crude petroleum is converted to useful products by the process of?

A

fractional crystallization

B

fractional distillation

C

filtration

D

chromatography

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22

An organic compound contains 69% carbon, 15.3% hydrogen and 30.7% oxygen. Calculate the the empirical formula [C=12, H = 1, O = 16]

A

C\(_4\)H\(_12\)O

B

C\(_3\)H\(_9\)O

C

C\(_4\)H\(_9\)O

D

C\(_3\)H\(_8\)O

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23

2H\(_2\) + O\(_2\) → 2H\(_2\)O

From the equation above, calculate the volume of unreacted oxygen gas if a mixture of 50cm\(^3\) of hydrogen and 75cm\(^3\) of oxygen is involved

A

85cm\(^3\)

B

50cm\(^3\)

C

125cm\(^3\)

D

55cm\(^3\)

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24

In which of the following will hydrogen form an ionic compound? 

A

HCL

B

NaH

C

NH\(_3\)

D

CH\(_4\)

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25

If the volume of a given mass of a gas at 0ºc is 29.5cm\(^3\). What will be the volume of the gas at 15ºc, given that the pressure remains constant?

A

31.6

B

62.2

C

32.7

D

31.1

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26

The reactions below represent neutralization reactions, in which of them is the value of ΔH highest?

A

CH\(_3\)CH\(_2\)COOH + KOH → CH\(_3\)CH\(_2\)COOK + H\(_2\)O

B

NH\(_4\)OH + HCL → NH\(_4\) + H\(_2\)O

C

NaOH + HCL → NaCL + H\(_2\)O

D

CH\(_3\)COOH + NaOH → CH\(_3\)COONa + H\(_2\)O

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27

The pollutant that is usually present in a city which generates its electricity from coal?

A

fog

B

carbon(ii)oxide

C

smog

D

sulphur(iv)oxide

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28

The dehydration of CH\(_3\)CH\(_2\)CH\(_2\)CH\(_2\)OH will give?

A

HC≡CCH\(_2\)CH\(_3\)

B

CH\(_2\)≡CH\(_2\)CH\(_3\)

C

CH\(_3\)C≡CCH\(_3\)

D

CH\(_3\)CH=CHCH\(_3\)

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29

When heat is absorbed during a chemical reaction, the reaction is said to be ___

A

thermodynamic

B

exothermic

C

isothermal

D

endothermic

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30

Which of the following best represents a solid gas mixture?

A

milk

B

kerosene

C

soil

D

smoke

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