IGCSE Chemistry Paper-1: Specimen Questions with Answers 87 - 89 of 99

Question 87

Question

MCQ▾

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

Choices

Choice (4)

a.

Which is Not Unsaturated Hydrocarbon – Choice A

b.

Which is Not Unsaturated Hydrocarbon – Choice B

c.

Which is Not Unsaturated Hydrocarbon – Choice C

d.

All 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 88

Question

MCQ▾

What is molarity?

Choices

Choice (4)

a.

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

b.

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

c.

Question does not provide sufficient data or is vague

d.

All of the above

Answer

a.

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 89

Question

MCQ▾

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

Reaction of Sodium Sulphate with Barium Chloride

Choices

Choice (4)

a.

Barium sulphate

b.

Sulphur chloride

c.

Potassium sulphate

d.

All 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

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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