English Medium कक्षा १० - CBSE Question Bank Solutions

In the context of redox reactions, the removal of hydrogen from a substance is known as ______.

In order to prevent the spoilage of potato chips, they are packed in plastic bags in an atmosphere of ______.

The process of respiration is ______.

You are given the following chemical equation:

\[\ce{Mg_{(s)} + CuO_{(s)} -> MgO_{(s)} + Cu_{(s)}}\]

This equation represents:

Identify the substances that are oxidised and the substances that are reduced in the following reaction.

\[\ce{CuO_{(s)} + H2_{(g)} -> Cu_{(s)} + H2O_{(l)}}\]

 Explain the following in term Reduction of gain or loss of oxygen with two example.

The colours of aqueous solutions of CuSO₄ and FeSO₄ as observed in the laboratory are:

(A) pale green and light blue respectively

(B) light blue and dark green respectively

(C) dark blue and dark green respectively

(D) dark blue and pale green respectively

Explain the following in term of gain or loss of oxygen with two examples.

Oxidation

Explain the following in term of gain or loss of oxygen with two examples.

Reduction

Describe in brief how urine is produced in the human body.

Rusting of iron involves a chemical reaction which is a combination of:

Which of the following statements about the given reaction are correct?

\[\ce{3Fe_{(s)} + 4H2O_{(g)} -> Fe3O4_{(s)} + 4H2_{(g)}}\]

(i) Iron metal is getting oxidised.

(ii) Water is getting reduced.

(iii) Water is acting as the reducing agent.

(iv) Water is acting as oxidising agent.

Oxidation is a process which involves ____________.

The process of reduction involves ____________.

\[\ce{MnO2 + 4HCl -> + 2H2O + Cl2}\]

Identify the substance oxidized in the above equation.

When Ag is exposed to air it gets a black coating of ____________.

Select the oxidising agent for the following reaction:

\[\ce{H2S + I2 -> 2HI + S}\]

The process of diffusion of solvent particles from the region of less solute concentration to a region of high solute concentration through a semi-permeable membrane is known as ____________.

In the reaction of iron with copper sulphate solution:

CuSO₄ + Fe → Cu + FeSO₄

Which option in the given table correctly represents the substance oxidized and the reducing agent?

Plants use completely different process for excretion as compared to animals. Which one of the following processes is NOT followed by plants for excretion?