Question Paper
Class / Subject: Class 10 (ICSE) · Chemistry
Chapter: Chapter 5 — Chapter 5: Mole Concept and Stoichiometry
Time Allowed: 32 minutes
Max Marks: 16
1. What is Avogadro's number? [1]
(A) 6.022×10²³
(B) 6.022×10¹⁰
(C) 3.14×10²³
(D) 1×10²³
2. What does 1 mole of a substance contain? [1]
(A) 6.022×10²³ particles
(B) 100 particles
(C) 1 particle
(D) 1000 particles
3. What is molar mass? [1]
(A) Mass of 1 mole of a substance in grams
(B) Mass of 1 particle
(C) Mass of 1 litre
(D) Mass of 1kg always
4. What is the molar volume of a gas at STP? [1]
(A) 22.4 litres
(B) 1 litre
(C) 100 litres
(D) 10 litres
5. What does STP stand for? [1]
(A) Standard Temperature and Pressure
(B) Standard Time Period
(C) Simple Test Procedure
(D) None of these
6. What does stoichiometry use? [1]
(A) Balanced chemical equations
(B) Only unbalanced equations
(C) No equations
(D) Random guessing
7. What can stoichiometry calculate? [1]
(A) Amounts of reactants and products
(B) Only colours of substances
(C) Only smells of substances
(D) Nothing useful
8. Why learn the mole concept? [1]
(A) It's the basis for stoichiometric calculations
(B) No reason
(C) It's not useful
(D) Only for tests
9. What is Avogadro's number? [1]
(A) 6.022×10²³
(B) 6.022×10¹⁰
(C) 3.14×10²³
(D) 1×10²³
10. What does 1 mole of a substance contain? [1]
(A) 6.022×10²³ particles
(B) 100 particles
(C) 1 particle
(D) 1000 particles
11. What is molar mass? [1]
(A) Mass of 1 mole of a substance in grams
(B) Mass of 1 particle
(C) Mass of 1 litre
(D) Mass of 1kg always
12. What is the molar volume of a gas at STP? [1]
(A) 22.4 litres
(B) 1 litre
(C) 100 litres
(D) 10 litres
13. What does STP stand for? [1]
(A) Standard Temperature and Pressure
(B) Standard Time Period
(C) Simple Test Procedure
(D) None of these
14. What does stoichiometry use? [1]
(A) Balanced chemical equations
(B) Only unbalanced equations
(C) No equations
(D) Random guessing
15. What can stoichiometry calculate? [1]
(A) Amounts of reactants and products
(B) Only colours of substances
(C) Only smells of substances
(D) Nothing useful
16. Why learn the mole concept? [1]
(A) It's the basis for stoichiometric calculations
(B) No reason
(C) It's not useful
(D) Only for tests