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Chemistry Past Questions

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50 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10

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50 questions

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Question 21

jamb 2004

\(^{226}\)\(_{88}\)Ra → \(^x\)\(_{86}\)Rn + α - particle
What is the value of x in the nuclear reaction above?

A220

B222

C226

D227

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Question 22

jamb 2004

The shape of s-orbitals is

Aspherical

Belliptical

Cspiral

Dcircular

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Question 23

jamb 2004

An electron can be added to a halogen atom to form a halide ion with

A2 valence electrons

B3 valence electrons

C7 valence electrons

D8 valence electrons

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Question 24

jamb 2004

A given volume of methane diffuses in 20s. How long will it take the same volume of sulphur (IV) oxide to diffuse under the same conditions?
[C = 12, H = 1, S = 32, O = 16

A5s

B20s

C40s

D60s

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Question 25

jamb 2004

It is difficult to achieve an orderly arrangement of the molecules of a gas because they?

Ahave no definite shape

Bhave little force of attraction between them

Ccan collide with one another in the container

Dare too small in size

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Question 26

jamb 2004

According to charles' law, the volume of a gas becomes zero at

A0 ^oC

B-100 ^oC

C-273 ^oC

D-373 ^oC

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Question 27

jamb 2004

What volume of gas is evolved at S.t.p if 2g of calcium trioxocarbonate (IV) is added to a solution of hydrochloric acid?
[Ca = 40, C = 12, O = 16, Cl = 35.5, H = 1 Molar volume of a gas at s.t.p = 22.4 dm\(^3\)

A112 cm³

B224 cm³

C448 cm³

D2240 cm³

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Question 28

jamb 2004

If a solution contains 4.9g of tetraoxosulphate (VI) acid, calculate the amount of copper (II) oxide that will react with it
[Cu = 64, O = 16, S = 32, H = 1]

A0.8g

B4.0g

C40.0g

D80.0g

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Question 29

jamb 2004

A chemical reaction is always associated with

Aan increase in the composition of one of the substance

Ba change in the volume of the reactants

Ca change in the nature of the reactants

Dthe formation of new substance

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Question 30

jamb 2004

When a solid substance disappears completely as a gas on heating, the substance is said to have undergone

Aevaporation

Bdistillation

Ccrystallization

Dsublimation

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