Chemical Reactions: A Comprehensive Guide for Engineering Students

Question 1

Which factor does NOT influence the rate of a chemical reaction?

Accepted Answer

Volume of the reaction vessel

Answer

Temperature

Answer

Concentration of reactants

Answer

Surface area of reactants

Question 2

Which substance is a strong electrolyte?

Accepted Answer

Sodium chloride

Answer

Glucose

Answer

Water

Answer

Carbon dioxide

Question 3

Select the type of chemical reaction that does NOT occur when two or more substances combine to form a single product.

Accepted Answer

Decomposition

Answer

Combination

Answer

Neutralization

Answer

Single displacement

Question 4

Which unit is used in the International System of Units (SI) to measure the amount of a substance?

Accepted Answer

Mole

Answer

Gram

Answer

Liter

Answer

Kelvin

Question 5

Which type of reaction involves the transfer of electrons between atoms or ions?

Accepted Answer

Redox reaction

Answer

Acid-base reaction

Answer

Precipitation reaction

Answer

Gas-forming reaction

Question 6

In the reaction 2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O, which reactant will be completely consumed first?

Accepted Answer

C₄H₁₀

Answer

O₂

Answer

CO₂

Answer

H₂O

Question 7

Which of the following reactions is exothermic?

Accepted Answer

2H₂ + O₂ -> 2H₂O

Answer

CaCO₃ -> CaO + CO₂

Answer

HCl + NaOH -> NaCl + H₂O

Answer

NH₄Cl -> NH₃ + HCl

Question 8

Predict the products of the following reaction: CH₄ + 2O₂ ->

Accepted Answer

CO₂ + 2H₂O

Answer

CO + 2H₂O

Answer

CO₂ + H₂O

Answer

C + 2H₂O

Question 9

Which of the following is a redox reaction?

Accepted Answer

Fe₂O₃ + 3CO -> 2Fe + 3CO₂

Answer

2Na + Cl₂ -> 2NaCl

Answer

H₂SO₄ + 2NaOH -> Na₂SO₄ + 2H₂O

Answer

CH₄ + 2O₂ -> CO₂ + 2H₂O

Question 10

Which of the following is a homogeneous equilibrium?

Accepted Answer

Gaseous N₂(g) + 3H₂(g) -> 2NH₃(g)

Answer

Solid CaCO₃(s) + Heat -> CaO(s) + CO₂(g)

Answer

Liquid H₂O(l) + Heat -> Gaseous H₂O(g)

Answer

Solid NaCl(s) -> Aqueous NaCl(aq)

Question 11

Which of the following is not a type of chemical reaction?

Accepted Answer

Nuclear fusion

Answer

Oxidation-reduction

Answer

Combustion

Answer

Neutralization

Question 12

Which of the following reactions releases energy as heat?

Accepted Answer

Combustion of methane

Answer

Dissolution of sodium chloride in water

Answer

Neutralization of hydrochloric acid with sodium hydroxide

Answer

Evaporation of water

Question 13

In the reaction 2CH4 + 3O2 → 2CO2 + 4H2O, if 4 moles of CH4 and 10 moles of O2 are available, which reactant is limiting?

Accepted Answer

CH4

Answer

O2

Answer

H2O

Answer

CO2

Question 14

Identify the option that is NOT a type of chemical reaction.

Accepted Answer

Radioactive Decay

Answer

Combination

Answer

Decomposition

Question 15

In the reaction 2Na + Cl2 → 2NaCl, what is the stoichiometric ratio of sodium to chlorine?

Accepted Answer

2:1

Answer

1:1

Answer

3:1

Answer

1:2

Question 16

Balance the following chemical equation: Mg + HCl → ?

Accepted Answer

Mg + 2HCl → MgCl2 + H2

Answer

2Mg + HCl → 2MgCl + H2

Answer

Mg + HCl → MgCl + H

Answer

Mg + H2Cl → MgCl + 2H

Question 17

Identify the precipitation reaction from the following options:

Accepted Answer

BaCl2(aq) + Na2SO4(aq) → BaSO4(s) + 2NaCl(aq)

Answer

HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l)

Answer

CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)

Answer

2Mg(s) + O2(g) → 2MgO(s)

Question 18

Which factor influences the rate of a chemical reaction?

Accepted Answer

Concentration of reactants

Answer

Volume of the container

Answer

Color of the reactants

Question 19

Identify the strong electrolyte from the following options:

Accepted Answer

NaCl

Answer

CH3OH

Answer

NH3

Answer

C6H12O6