Chemistry Past Questions | JAMB, WAEC, NECO and Post UTME Past Questions


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Question 4251

An element used in the production of matches is

Options

A) nitrogen

B) aluminium

C) copper

D) sulphur

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Question 4252

A given amount of gas occupies 10.0dm5 at 4atm and 273°C. The number of moles of the gas present is [Molar volume of gas at s.t.p = 22.4dm\(^3\)]

Options

A) 0.89 mol

B) 1.90 mol

C) 3.80 mol

D) 5.70 mol

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Question 4253

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

Options

A) 0°C

B) -100°C

C) -273°C

D) -373°C

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Question 4254

A substance that is used as a ripening agent for fruits is

Options

A) ethene

B) propane

C) methane

D) butane

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Question 4255

The Sulphide which is insoluble in dilute hydrochloric acid is

Options

A) FeS

B) CuS

C) ZnS

D) Na2S

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Question 4256

What is the PH of 0.00 1 moldm\(^3\) solution of the sodium hydroxide

Options

A) 14

B) 13

C) 12

D) 11

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Question 4257

The type of bonding in [Cu(NH\(_3\))\(^4\)]\(^{2+}\) is 

Options

A) coordinate

B) electrovalent

C) metallic

D) covalent

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Question 4258

Which of the following is an example of a chemical change?

Options

A) dissolution of salt in water

B) rusting of iron

C) melting of ice

D) separating a mixture by distillation

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Question 4259

To what temperature must a gas at 273k be heated in order to double both its volume and pressure?

Options

A) 298K

B) 546K

C) 819K

D) 1092K

Comments (1)

Question 4260

According to the Kinetic Theory an increase in temperature causes the kinetic energy of particles to

Options

A) decrease

B) increase

C) be zero

D) remain constant

Comments (2)