Home / iGCSE Chemistry Multiple Choice (Extended) : 12.1 Experimental design: Exam Style Questions Paper 2

iGCSE Chemistry Multiple Choice (Extended) : 12.1 Experimental design: Exam Style Questions Paper 2

iGCSE Chemistry MCQ (Extended) Paper 2 - All Chapters
Question

Which piece of apparatus can only measure a single fixed volume?

A) a 250 cm3 beaker

B) a 50 cm3 burette

C) a 100 cm3 measuring cylinder

D) a 25 cm3 volumetric pipette

▶️ Answer/Explanation
Solution

Ans: D

Let’s analyze each option:

  • A) Beaker – Can hold various volumes up to its capacity, not precise for measuring
  • B) Burette – Can measure variable volumes with high precision
  • C) Measuring cylinder – Can measure different volumes within its range
  • D) Volumetric pipette – Designed to measure and transfer a single, precise fixed volume (25 cm3 in this case)

Volumetric pipettes are calibrated to deliver only one specific volume with high accuracy, making them unique among the options for measuring a single fixed volume. This is why they’re commonly used in titrations and other precise analytical work where exact volumes are required.

Question

A known volume and concentration of aqueous sodium hydroxide is titrated against dilute hydrochloric acid.

The volume of dilute hydrochloric acid needed to exactly neutralise the sodium hydroxide is measured.

Five calculation steps are shown.

  1. Calculate the amount of hydrochloric acid in moles.
  2. Calculate the relative formula mass of hydrochloric acid.
  3. Calculate the concentration of hydrochloric acid in g/dm3.
  4. Calculate the amount of sodium hydroxide in moles.
  5. Calculate the concentration of hydrochloric acid in mol/dm3.

What is the order of these steps to calculate the concentration of the hydrochloric acid in g/dm3?

A) 1 → 4 → 3 → 5 → 2
B) 1 → 2 → 4 → 5 → 3
C) 4 → 1 → 5 → 2 → 3
D) 4 → 2 → 1 → 3 → 5

▶️ Answer/Explanation
Solution

Ans: C

The correct order is:

  1. Calculate moles of NaOH (step 4)
  2. Use stoichiometry to find moles of HCl (step 1)
  3. Calculate HCl concentration in mol/dm³ (step 5)
  4. Find Mr of HCl (step 2)
  5. Convert to g/dm³ (step 3)

Therefore, the sequence is 4 → 1 → 5 → 2 → 3 (option C). You must start with the known quantity (NaOH), use the 1:1 reaction ratio, then convert between units. The other sequences either start incorrectly or perform conversions in the wrong order.

Question

 Which substance should be pure for the intended use?

  1. a drug for curing disease
  2. limestone for iron extraction
  3. petroleum for fractional distillation
  4. water for washing a car
Answer/Explanation

Ans:

A

Question

 A student measures the time taken for 2.0 g of magnesium to dissolve in 50 cm3 of dilute sulfuric acid.

Which apparatus is essential to complete the experiment?

  1. stop-clock
  2. measuring cylinder
  3. thermometer
  4. balance

A 1, 2 and 4               B 1 and 2 only                C 1 and 4 only                D 2, 3 and 4

Answer/Explanation

Ans:

A

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