The Mole and Calculations IGCSE Chemistry MCQ Online Test, Set 1 (with Solutions)

The Mole and Calculations: Practice Set 1

Instructions

10 questions: multiple-choice questions, Core and Extended (Extended-only questions are tagged)
Time: 15 minutes. The countdown runs at the top right; the test submits by itself when time is up.
+1 for each correct answer, no negative marking
The test opens in an exam console, like a real computer-based test. Choosing an option does not save it: click Save & Next to save, or Mark for Review & Next to save it and come back later. Clear Response removes a saved answer.
Click any number in the question palette to go to that question. Your answers are kept in this browser, so you can resume if the page closes.
After submitting: score, accuracy, time analysis and a full solution for every question

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5Answered and marked for review (counted)

Your name (shown on the console) I have read the instructions and I am ready to begin.

4.0 g of sodium hydroxide is dissolved to make 0.50 dm³ of solution. What is the concentration?

(a) 8.0 g/dm³(b) 2.0 g/dm³(c) 4.5 g/dm³(d) 0.125 g/dm³

2Extended

What volume does 0.25 mol of a gas occupy at r.t.p.?

(a) 96 dm³(b) 6.0 dm³(c) 24 dm³(d) 0.0104 dm³

What is a volume of 75 cm³ in dm³?

(a) 75 000 dm³(b) 7.5 dm³(c) 0.075 dm³(d) 0.75 dm³

12 g of potassium chloride is dissolved in water to make 400 cm³ of solution. What is the concentration of the solution?

(a) 30 g/dm³(b) 4.8 g/dm³(c) 0.030 g/dm³(d) 3.0 g/dm³

5Extended

What is the mass of 0.20 mol of carbon dioxide?

(a) 8.8 g(b) 220 g(c) 0.0045 g(d) 44 g

What mass of solute is dissolved in 200 cm³ of a solution of concentration 25 g/dm³?

(a) 125 g(b) 5.0 g(c) 8.0 g(d) 50 g

Which pair of units can both be used for concentration?

(a) g and mol(b) g/dm³ and mol/dm³(c) dm³/mol and g/dm³(d) mol and dm³

Thymolphthalein is added to aqueous sodium hydroxide in a conical flask, and dilute acid is added from a burette. What is the colour change at the end-point?

(a) blue to colourless(b) colourless to blue(c) yellow to red(d) red to yellow

What colour is methyl orange indicator in an alkaline solution?

(a) red(b) yellow(c) blue(d) colourless

10Extended

How many particles are in one mole of a substance?

(a) 6.02 × 10⁻²³(b) 24 000(c) 6.02 × 10²³(d) 12