IGCSE Chemistry Paper-1: Specimen Questions with Answers 87 - 89 of 99
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Question 87
Question
MCQ▾Which of the following below figure is not an unsaturated hydrocarbon?
Choices
| Choice (4) | |
|---|---|
a. |  |
b. |  |
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?
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.