chemistry-test-and-solutions-chapter-1-1

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Created by

Ghulam Nabi

Chemistry

Chemistry MTN - 55

Total Mcqs : 30 Mcqs

Time Duration : 15 Minutes

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1 / 30

For the reaction: 2KClO₃ → 2KCl + 3O₂. If 2 moles of KClO₃ decompose, how many moles of O₂ are produced?

a) 1 mole

b) 2 moles

c) 3 moles

d) 4 moles

2 / 30

Consider the reaction: N₂ + 3H₂ → 2NH₃. What is the mole ratio of H₂ to NH₃?

a) 1:2

b) 1:3

c) 3:2

d) 2:3

3 / 30

For the reaction: 2SO₂ + O₂ → 2SO₃. If 64.0 g of SO₂ reacts, what mass of SO₃ is formed? (Atomic masses: S=32, O=16)

a) 40.0 g

b) 64.0 g

c) 80.0 g

d) 160.0 g

4 / 30

A sample of gas occupies 44.8 L at STP. How many moles of gas are present?

a) 0.5 mol

b) 1.0 mol

c) 2.0 mol

d) 4.0 mol

5 / 30

The volume occupied by 1 mole of any ideal gas at Standard Temperature and Pressure (STP) is:

a) 1.0 L

b) 11.2 L

c) 22.4 L

d) 44.8 L

6 / 30

What is the molar mass of glucose (C₆H₁₂O₆)? (Atomic masses: C=12, H=1, O=16)

a) 90 g/mol

b) 150 g/mol

c) 180 g/mol

d) 210 g/mol

7 / 30

How many molecules are in 2.0 moles of water (H₂O)?

a) 1.204×10²⁴ molecules

b) 6.022×10²³ molecules

c) 3.011×10²³ molecules

d) 1.806×10²⁴ molecules

8 / 30

What is the mass of 1 molecule of water (H₂O)? (Atomic masses: H=1, O=16; Avogadro's number = 6.022×10²³ molecules/mol)

a) 18.0 g

b) 1.80×10²³ g

c) 2.99×10⁻²³ g

d) 3.34×10⁻²⁴ g

9 / 30

How many liters will 0.5 moles of oxygen gas (O₂) occupy at STP?

a) 5.6 L

b) 11.2 L

c) 22.4 L

d) 44.8 L

10 / 30

For the reaction: 2Al + 3Cl₂ → 2AlCl₃. If 0.6 moles of Al react, how many moles of Cl₂ are required?

a) 0.9 moles

b) 1.1 moles

c) 1.2 moles

d) 1.8 moles

11 / 30

Which of the following is NOT an example of a representative particle?

a) Atom

b) Molecule

c) Formula unit

d) Gram

12 / 30

Which of the following contains the greatest number of atoms?

a) 1 mole of CH₄

b) 1 mole of H₂O

c) 1 mole of O₂

d) 1 mole of NH₃

13 / 30

If 18 grams of water (H₂O) are produced, how many grams of hydrogen (H₂) must have reacted? (Reaction: 2H₂ + O₂ → 2H₂O; Atomic masses: H=1, O=16)

a) 1 g

b) 2 g

c) 4 g

d) 16 g

14 / 30

How many grams of water are produced from the complete combustion of 16.0 g of methane (CH₄) according to the equation in question 12? (Atomic masses: C=12, H=1, O=16)

a) 18.0 g

b) 27.0 g

d) 30.0 g

c) 36.0 g

15 / 30

How many atoms of oxygen are in 0.5 moles of carbon dioxide (CO₂)?

a) 3.011×10²³ atoms

b) 6.022×10²³ atoms

c) 1.204×10²⁴ atoms

d) 1.806×10²⁴ atoms

16 / 30

What is the mass of 0.75 moles of sodium chloride (NaCl)? (Atomic masses: Na=23, Cl=35.5)

a) 29.25 g

b) 35.75 g

c) 43.88 g

d) 58.50 g

17 / 30

How many moles of H₂SO₄ are needed to neutralize 0.5 moles of NaOH? (Reaction: H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O)

a) 0.125 moles

b) 0.25 moles

c) 0.5 moles

d) 1.0 moles

18 / 30

In the reaction CaCO₃ → CaO + CO₂, if 100 grams of CaCO₃ decomposes, what volume of CO₂ gas (at STP) is produced? (Atomic masses: Ca=40, C=12, O=16)

a) 11.2 L

b) 22.4 L

c) 33.6 L

d) 44.8 L

19 / 30

What is the mole ratio of oxygen to carbon dioxide in the complete combustion of propane (C₃H₈)? (Reaction: C₃H₈ + 5O₂ → 3CO₂ + 4H₂O)

a) 1:3

b) 3:1

c) 3:5

d) 5:3

20 / 30

What is the mass of 3.011×10²³ atoms of carbon? (Atomic mass: C=12)

a) 3.0 g

b) 6.0 g

c) 12.0 g

d) 24.0 g

21 / 30

How many representative particles are in 0.25 moles of any substance?

a) 1.51×10²³

b) 1.52×10²³

c) 3.01×10²³

d) 6.02×10²³

22 / 30

What is the mass of 0.1 moles of CO₂? (Atomic masses: C=12, O=16)

a) 2.24 g

b) 4.40 g

c) 22.4 g

d) 44.0 g

23 / 30

If 56.0 L of N₂ gas at STP reacts with excess H₂ according to N₂ + 3H₂ → 2NH₃, what volume of NH₃ gas (at STP) is produced?

a) 22.4 L

b) 44.8 L

c) 112.0 L

d) 168.0 L

24 / 30

If 10.0 L of hydrogen gas at STP reacts with excess oxygen to form water, how many liters of oxygen gas (at STP) are consumed? (Reaction: 2H₂ + O₂ → 2H₂O)

a) 2.5 L

b) 5.0 L

c) 10.0 L

d) 20.0 L

25 / 30

How many moles are present in 49.0 grams of sulfuric acid (H₂SO₄)? (Atomic masses: H=1, S=32, O=16)

a) 0.25 mol

b) 0.50 mol

c) 1.0 mol

d) 2.0 mol

26 / 30

Consider the reaction: CH₄ + 2O₂ → CO₂ + 2H₂O. If 4 moles of CH₄ are completely combusted, how many moles of H₂O are produced?

a) 2 moles

b) 4 moles

c) 6 moles

d) 8 moles

27 / 30

In the reaction C + O₂ → CO₂, if 12.0 g of carbon reacts completely, what mass of CO₂ is formed? (Atomic masses: C=12, O=16)

a) 16.0 g

b) 32.0 g

c) 44.0 g

d) 56.0 g

28 / 30

How many grams of NaCl are needed to produce 2.0 moles of AgCl according to the reaction: AgNO₃ + NaCl → AgCl + NaNO₃? (Atomic masses: Na=23, Cl=35.5)

a) 58.5 g

b) 87.75 g

c) 117.0 g

d) 234.0 g

29 / 30

Which of the following statements is true regarding Avogadro's number?

a) It is the number of grams in one mole of a substance.

b) It is the number of representative particles in one mole of a substance.

c) It is the volume occupied by one mole of a gas at STP.

d) It is the mass of an atom in atomic mass units.

30 / 30

What is the number of moles of CO₂ produced when 5 moles of C₃H₈ are completely combusted? (Reaction: C₃H₈ + 5O₂ → 3CO₂ + 4H₂O)

a) 5 moles

b) 10 moles

c) 15 moles

d) 20 moles

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