Mass and Stoichiometry, Class 11 Chemistry NCERT Solutions

1. There will be total 20  MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying.

1. For the reaction 2NaN₃(s) → 2Na(s) + 3N₂ (g), how many moles of sodium azide (NaN₃) must react in order to produce 8.75 moles of nitrogen gas?

  13.1 moles NaN₃

 2.50 moles NaN₃

 2.00 moles NaN₃

 5.83 moles NaN₃

Question 1 of 20

2. Formula mass is used for which of the following substances?

  Ionic compounds

 Molecules

 Atoms

 Molecular compounds

Question 2 of 20

3. Amount of water produced by the combustion of 16g of methane is:

  34 g

 30 g

 32 g

 36 g

Question 3 of 20

4. Branch of chemistry in which quantities of reactants and products of a chemical reaction are determined is known as:

  Thermodynamics

 Stoichiometry

 Chemical kinetics

 Stereochemistry

Question 4 of 20

5. The mass of 1 Χ 10²² molecules of CuSO₄.5H₂O is:

  41.59 g

 415.9 g

 4.159 g

  None of these

Question 5 of 20

6. Which of the following is an element?

  Sugar solution

 Brass

  HCl

 Copper metal

Question 6 of 20

7. The mass of one mole of NaOH will be( At. mass of Na =23, O = 16, H =1)

  16

 40

 80

 23

Question 7 of 20

8. Substances whose two or more components completely mix with each other to make a uniform composition are called:

  Ionic compounds

 Elements

 Heterogeneous mixtures

  Homogenous mixtures

Question 8 of 20

9. If 2 moles of H₂ and O₂ are available for the reaction, identify the limiting reagent for the reaction,
2H₂ + O₂ → 2H₂O

  H₂

 O₂

 H₂O

 Both H₂ and O₂

Question 9 of 20

10. Which of the following has more number of atoms?

 1 mole of Neon gas

 1 mole of Ozone gas

 1 mole of Oxygen gas

 1 mole of Carbon monoxide gas

Question 10 of 20

11. Molecular mass of glucose molecule (C₆H₁₂O₆) is:

 172 g

 182 g

 180 g

 192 g

Question 11 of 20

12. If 0.5 mole of BaCl₂ is mixed with 0.2 mole of Na₃PO₄ ,then maximum number of moles of Ba₃(PO₄)₂ that can be formed

 0.5

 0.1

 0.3

 0.7

Question 12 of 20

13. The atomic mass of an element is usually fractional because:

  Elements contain impurities

 Elements are mixture of isotopes

 Elements are mixture of allotropes

 Elements are mixture of isobars

Question 13 of 20

14. Which of the following is a compound?

  Air

 Gold

 Water

 Sulphur

Question 14 of 20

15. If you have 2 moles of A and 3 moles of B, Identify the limiting reagent in the following reaction.

A + B → AB

  A

 B

 A as well as B

 None

Question 15 of 20

16. According to the chemical equation,

Mg(s) + 2HCl → MgCl₂(aq) + H₂(g)

How many moles of magnesium are needed to produce 12.34 moles of hydrogen gas?

 24.68 mol

 3.09 mol

 6.17 mol

 12.34 mol

Question 16 of 20

17. Two different atoms A and B combine together to form AB. What will be AB?

  Atom

 Ion

 Element

 Molecule

Question 17 of 20

18. Arsenic is a/an:

  Element

 Heterogeneous mixture

 Homogeneous mixture

 Compound

Question 18 of 20

19. If 0.5 mole of BaCl₂ is mixed with 0.2 mole of Na₃PO₄, then the maximum number of moles of Ba₃(PO₄)₂ that can be formed will be:

  0.1

 0.3

 0.7

 0.5

Question 19 of 20

20. 20 L of H₂ gas at S.T.P weigh about:

 20 g

 1.8 g

 12.2 g

 448 g

Question 20 of 20

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