2023 - JAMB Chemistry Past Questions and Answers - page 4

31

 

What is the principal ore of iron, from which iron is extracted?

A

Calcite

B

Bauxite

C

Magnetite

D

Hematite

32

 

What is the symbol used to represent an alpha particle?

A

α

B

γ

C

δ

D

β

33

 

What type of reaction is involved in the formation of alkanols from alkenes?

A

Elimination reaction

B

Redox reaction

C

Substitution reaction

D

Addition reaction

34

 

At 2.0 atm pressure, the volume of a gas is 4.0 L. If the pressure is reduced to 1.0 atm while keeping the temperature constant, what will be the new volume of the gas?

A

2.0 L

B

6.0 L

C

8.0 L

D

4.0 L

35

Which of the following factors does NOT affect the rate of a chemical reaction?

A
Concentration of reactants
B
Presence of a catalyst
C
Molecular weight of products
D
Temperature
36

 

Stainless steel is an alloy made up of

A

Iron and zinc

B

Copper and tin

C

Iron and chromium

D

Iron and carbon

37

 

If gas A has a molar mass of 32 g/mol and gas B has a molar mass of 64 g/mol, what is the ratio of their diffusion rates?

A

2:1

B

1:2

C

1:1

D

1:4

38

 

What is the mass (in grams) of 500 mL of ethanol? (density of ethanol = 0.789 g/mL)

A

394.5 mL

B

500 mL

C

394.5 g

D

500 g

39

 

Who proposed the planetary model of the atom with electrons orbiting the nucleus?

A

Erwin Schrödinger

B

Ernest Rutherford

C

Niels Bohr

D

J.J. Thomson

40

 

Which of the following substances is NOT hygroscopic?

A

Salt

B

Sugar

C

Silica gel

D

Aluminum

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