# Stoichiometry Quiz Questions and Answers

Questions : 12 | Total Attempts: 386 | Recent Updated: 16-Jan-2022
Stoichiometry is the quantitative relation between the number of moles (and therefore mass) of various products and reactants in a chemical reaction. Chemical reactions must be balanced, or in other words, must have the same number of various atoms in the products as in the reactants. Stoichiometry is the measure of the quantitative relationship between the products and reactants of a given chemical reaction in terms of their relative ratios of mass or volume. Stoichiometry is the fundamental mathematical principle used to describe the law of conservation of mass, which states that matter cannot be created nor destroyed, but only converted from one form to another. Let's know more about Stoichiometry.

### Questions Excerpt

1. The formula of a metal oxide is Z₂O₃. If 6 mg of hydrogen is required for complete reduction of 0.1596gm metal oxide, then the at. weight of metal is-

A. 227.9

B. 159.6

C. 79.8

D. 55.8

2. The no. of moles of OHˉin 0.3l of 0.005M Ba(OH)₂ is-

A. 0.075

B. 0.005

C. 0.045

D. 0.003

3. The volume of CO₂ at STP obtained by heating 1gm of CaCO₃ will be...

A. 1litre

B. 22.4 litre

C. 0.224 litre

D. 11.2 litre

4. The vapor density of a gas is 11.2 the volume occupied by 11.2gm of this gas at NTP is-

A. 1 litre

B. 11.2 litre

C. 22.4 litre

D. 20 litre

5. The significant figure in 5.23×10⁵ are-

A. 8

B. 3

C. 4

D. Infinite

6. From the following the no. of atoms is greater in...

A. 4g hydrogen

B. 71g chlorine

C. 48g magnesium

D. 127g iodine

7. One mole of CO₂ contains-

A. 6.02×10²³ atoms of C

B. 6.02×10²³ atoms of O

C. 18.1×10²³ atoms of CO₂

D. 3g molecules of CO₂

8. At STP conditions the no. of moles of oxygen in a liter of air which has 21% oxygen by volume is-

A. 2.10 mole

B. 0.0093

C. 0.186mole

D. 0.21 mole

9. How much amount of zinc is required to react with dilute H₂SO₄ for obtaining 43ml vapor. Then the vapor density of the substance will be...

A. 0.65gm

B. 6.5gm

C. 65gm

D. 0.065gm

10. Which has maximum molecules...

A. 7gm N₂

B. 2gm H₂

C. 16gm NO₂

D. 16gm O₂

11. The mole ratio of H₂ and O₂ gas is 8:1. What will be the ratio of wt?

A. 1:1

B. 2:1

C. 4:1

D. 1:2

12. The volume of CO₂ at NTP obtained by the complete decomposition of 9.85gm. BaCO₃ is-(At. wt of Ba=137)...

A. 22.4 litre

B. 1.12 litre

C. 0.84 litre

D. 0.56 litre

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