IGCSE Chemistry Paper-1: Specimen Questions with Answers 13 - 14 of 99

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Question 13

Question

MCQ▾

A solution contains barium ions and silver ions and one type of anion. What could the anion be?

Choices

Choice (4)

a.

chloride only

b.

sulphate only

c.

nitrate only

d.

chloride or nitrate or sulphate

Answer

c.

Explanation

Any solution that contains both barium and sulphate ions would precipitate barium sulphate, or BaSO4. that՚s because barium sulphate isn՚t water-soluble.

Any solution that contains both silver ions and chloride ions would precipitate silver chloride, or AgCl. Like barium sulphate, silver chloride isn՚t water-soluble. ‎But ALL nitrates are soluble, including Ba (NO3)2 and AgNO3. Nothing would precipitate from a solution that contained barium, silver, and nitrate ions. ‎

Question 14

Question

MCQ▾

What is always true for a pure substance?

Choices

Choice (4)

a.

It always boils at 100 °Celsius.

b.

It contains only one type of atom

c.

It is solid at room temperature

d.

It has a sharp melting point.

Answer

d.

Explanation

A pure substance is homogeneous, i.e., has uniform composition throughout the whole sample. Pure substances display a sharp melting and boiling point which means that that the material goes from solid to liquid in a very short temperature range. An impure substance would have a melting point with a broader range.

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