Kramizo
Log inSign up free
HomeCIE IGCSE ChemistryPercentage yield and percentage purity
CIE · IGCSE · Chemistry

Percentage yield and percentage purity
Practice Questions

13 CIE IGCSE Chemistry questions on Percentage yield and percentage purity, each with instant feedback and a full examiner-style mark scheme.

⚡ Start Quiz on Percentage yield and percentage purityTry one question

Try 2 sample questions on Percentage yield and percentage purity

Question 1 · 1 mark · Difficulty 1/3

Which of the following would cause the percentage yield of a reaction to be less than 100%?

  1. Using excess reactant
  2. Loss of product during transfer
  3. Using a catalyst
  4. Increasing the temperature
Show answer & explanation
✓ Answer: BLoss of product during transfer
Award 1 mark for identifying practical losses. A is incorrect — excess reactant does not reduce yield percentage. C is incorrect — catalysts increase rate but do not affect yield. D is incorrect — temperature changes may affect rate and equilibrium but loss during transfer is the direct cause of reduced yield.
Question 2 · 1 mark · Difficulty 3/3

In a laboratory preparation, a student obtained 18.5 g of magnesium oxide from burning magnesium ribbon. The theoretical yield was 20.0 g. The student then discovered that the product contained 1.5 g of unreacted magnesium. What is the percentage purity of the magnesium oxide produced?

  1. 91.9%
  2. 92.5%
  3. 8.1%
  4. 75.0%
Show answer & explanation
✓ Answer: A91.9%
9%. Award 1 mark for correct calculation: mass of pure MgO = 18.5 - 1.5 = 17.0 g; percentage purity = (17.0/18.5) × 100 = 91.9%. B is incorrect — this uses theoretical yield as denominator. C is incorrect — this represents percentage impurity. D is incorrect — this results from an incorrect calculation method.
⚡ Start a Quiz on Percentage yield and percentage purity
20 questions · 25 min · free

CIE IGCSE Chemistry: Percentage yield and percentage purity FAQ

How many CIE IGCSE Chemistry questions on Percentage yield and percentage purity are there on Kramizo?
Kramizo currently has 13 exam-board-aligned practice questions on Percentage yield and percentage purity for CIE IGCSE Chemistry, with new questions added every week. Each question gives you instant feedback and a full examiner-style mark scheme that tells you exactly what would earn marks on a real CIE paper. The questions span the full difficulty range — from straightforward recall (level 1) right up to multi-step reasoning and evaluation (level 3) — so the bank works for first-pass revision and final exam-week stress testing alike.
Is Kramizo free for CIE IGCSE students preparing for Chemistry?
Yes — completely free. Every student gets 45 questions a day on the free plan, with no card required and no trial countdown. That free quota works across every subject and every topic in our bank, so you can mix Percentage yield and percentage purity practice with other Chemistry topics or even switch to a totally different CIE subject without paying anything. Kramizo's optional Pro plan removes the daily cap and adds detailed progress analytics, but the free tier is the real product — used by thousands of GCSE, IGCSE and CSEC students.
Are the Percentage yield and percentage purity questions aligned to the official CIE IGCSE Chemistry syllabus?
Every question is written against the published CIE IGCSE Chemistry specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real CIE paper. Explanations are written in the style of official examiner mark schemes — they tell you what is being awarded marks and why distractors are wrong, not just whether you got it right. The bank is continually refined to match the latest syllabus updates from CIE.
How is Percentage yield and percentage purity typically tested on CIE IGCSE Chemistry papers?
Percentage yield and percentage purity appears across multiple question types on real CIE IGCSE Chemistry papers — most commonly as multiple-choice questions in the objective section, structured short-answer questions in the main paper, and occasionally as part of an extended response. Kramizo's practice bank reflects that mix: 4-option MCQs, true/false statements, fill-in-the-blank key terms, multi-select questions, and ordering questions. Working through the bank gives you exposure to every question style examiners actually use.

Lock in Percentage yield and percentage purity before exam day.

Start practising in 30 seconds — no card required.

⚡ Start Quiz Free →