Class 10 Practice Level 3 – Chemical Reactions And Equations – set – 2

Total questions: 15

Balance the following chemical equation: $ \displaystyle {{C}_{2}}{{H}_{5}}OH+{{O}_{2}}\to C{{O}_{2}}+{{H}_{2}}O.$ What are the coefficients for $ \displaystyle {{C}_{2}}{{H}_{5}}OH$ and $ \displaystyle {{O}_{2}}$?

Topic: Balancing Complex Chemical Equation

1 and 3

2 and 7

1 and 4

2 and 6

None

Which of the following reactions is both a redox and a double displacement reaction?

Topic: Identifying Types Of Reactions

$ \displaystyle 2Na+2{{H}_{2}}O\to 2NaOH+{{H}_{2}}$

$ \displaystyle F{{e}_{2}}{{O}_{3}}+3CO\to 2Fe+3C{{O}_{2}}$

$ \displaystyle AgN{{O}_{3}}+NaCl\to AgCl+NaN{{O}_{3}}$

$ \displaystyle 2KCl{{O}_{3}}\to 2KCl+3{{O}_{2}}$

None

Calculate the amount of $ \displaystyle {{H}_{2}}$ when 2 g of $ \displaystyle Mg$ reacts with excess $ \displaystyle HCl$. (Molar mass of $ \displaystyle Mg=24g/\text{mol},{{H}_{2}}=2g/mol)$

Topic: Stoichiometry

0.5 g

0.16 g

2 g

4 g

None

For the equilibrium reaction $ \displaystyle 2NO+{{O}_{2}}\leftrightarrow 2N{{O}_{2}},$ what happens if the concentration of $ \displaystyle NO$ is increased?

Topic: Equilibrium

The equilibrium shifts to the right

The equilibrium shifts to the left

There is no shift in equilibrium

The reaction rate decreases

None

In the reaction $ \displaystyle MnO_{4}^{-}+8{{H}^{+}}+5{{e}^{-}}\to M{{n}^{{2+}}}+4{{H}_{2}}O,$ what is the change in oxidation state of manganese?

Topic: Advanced Redox Reactions

$ \displaystyle +7\text{ to}+2$

$ \displaystyle +6\text{ to}+2$

$ \displaystyle +5\text{ to}+2$

$ \displaystyle +4\text{ to}+2$

None

Predict the products of the reaction: $ \displaystyle Ca{{(OH)}_{2}}+C{{O}_{2}}\to $

Topic: Predicting Products Of Reactions

$ \displaystyle CaC{{O}_{3}}+{{H}_{2}}O$

$ \displaystyle CaO+{{H}_{2}}O$

$ \displaystyle Ca+{{H}_{2}}O$

$ \displaystyle CaC{{O}_{3}}+{{O}_{2}}$

None

For the reaction $ \displaystyle 2S{{O}_{2}}+{{O}_{2}}\to 2S{{O}_{3}},$if the enthalpy change $ \displaystyle (\Delta H)$ is -197.8kJ, what can be inferred about the reaction?

Topic: Thermodynamics of Reactions

It is endothermic

It is exothermic

It is at equilibrium

It requires a catalyst

None

If 5 g of $ \displaystyle {{H}_{2}}$ reacts with 20g of $ \displaystyle {{O}_{2}}$, which is the limiting reagent? $ \displaystyle \left( {\text{Molar mass: }{{H}_{2}}=2g/\text{mol, }{{O}_{2}}=32g/\text{mol}} \right)$

Topic: Limiting Reagents

$ \displaystyle {{H}_{2}}$

$ \displaystyle {{O}_{2}}$

Both are limiting

Neither

None

Identify the type of reaction for the following equation: $ \displaystyle 2KCl{{O}_{3}}\to 2KCl+3{{O}_{2}}.$

Topic: Identifying Types Of Reactions

Combination

Decomposition

Combustion

Double displacement

None

10.

Which factor does not affect the rate of a chemical reaction?

Topic: Reaction Kinetics

Concentration of reactants

Surface area of reactants

Presence of a catalyst

Color of reactants

None

11.

In the reaction mechanism for the formation of ozone $ \displaystyle 2{{O}_{2}}+hv\to 2{{O}_{3}},$ the role of the photon (hv) is:

Topic: Reaction Mechanisms

It increases the activation energy.

It decreases the activation energy.

It provides the energy needed to break $ \displaystyle {{O}_{2}}$ bonds.

It gets consumed in the reaction.

None

12.

Which statement is true about catalysts?

Topic: Catalysts

They increases the activation energy of a reaction

They are consumed in the reaction

They change the position of equilibrium

They provide an alternative pathway for the reaction

None

13.

The formation of $ \displaystyle {{H}_{2}}O$ from $ \displaystyle {{H}_{2}}$ and $ \displaystyle {{O}_{2}}$ is an exothermic process. What does this imply about the reaction?

Topic: Energy Changes in Reactions

It releases energy to the surroundings

It absorbs energy from the surroundings

It is non-spontaneous

It does not change energy

None

14.

Which of the following best describes the activation energy of a reaction?

Topic: Reaction Mechanisms

It is the energy required to form the transition state

It is the energy released during the reaction

It is the final energy of the products

It is the energy of the reactants

None

15.

Which of the following will decrease the rate of a reaction?

Topic: Reaction rates

Increasing the concentration of reactants

Increasing the particle size of reactants

Increasing the temperature

Adding a catalyst

None

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Class 10 Practice Level 3 – Chemical Reactions And Equations – set – 2

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