CIE Chemistry Paper-1: Specimen Questions 87 - 89 of 99

Question number: 87

MCQ▾

Question

Which of the following below figure is not an unsaturated hydrocarbon?

Choices

Choice (4) Response
a.
Which is not unsaturated hydrocarbon – Choice A

Which is not unsaturated hydrocarbon – Choice A

Finding which choice is not an unsaturated hydrocarbon

b.
Which is not unsaturated hydrocarbon – Choice B

Which is not unsaturated hydrocarbon – Choice B

Finding which choice is not an unsaturated hydrocarbon

c.
Which is not unsaturated hydrocarbon – Choice C

Which is not unsaturated hydrocarbon – Choice C

Finding which choice is not an unsaturated hydrocarbon

d. None of the above

Answer

b.

Explanation

Unsaturated hydrocarbons are hydrocarbons that have many covalent bonds between adjacent carbon atoms. Those with at least one carbon-to-carbon double bond are called alkenes and those with at least one carbon-to-carbon triple bond are called alkynes.

Question number: 88

MCQ▾

Question

What is molarity?

Choices

Choice (4) Response
a.

Molarity is is the number of moles of solute per kilogram of solvent.

b.

Molarity is the number of moles of a substance per litre of solution.

c. None of the above
d. Question does not provide sufficient data or is vague

Answer

b.

Explanation

Molarity is also known as molar concentration, is the number of moles of a substance per litre of solution. Solutions labelled with the molar concentration are denoted with a capital M. A 1.0 M solution contains 1 mole of solute per litre of solution.

Question number: 89

MCQ▾

Question

A white precipitate is formed when sodium sulphate reacts with barium chloride. The substance formed is?

Reaction of sodium sulphate with barium chloride

Reaction of sodium sulphate with barium chloride

What will be the final product that will be formed

Choices

Choice (4) Response
a.

Barium sulphate

b.

Sulphur chloride

c.

Potassium sulphate

d. None of the above

Answer

a.

Explanation

The white precipitate of BaSO4 is formed by the reaction of SO42-and Ba2+. The other product formed is sodium chloride which remains in the solution. The reaction is as follows

Na2SO4+BaCl2BaSO4+2NaCl

The white insoluble substance formed is known as a precipitate. Any reaction that produces a precipitate can be called a precipitation reaction.

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