English Medium Class 10 - CBSE Question Bank Solutions

What is the force on a current-carrying wire that is parallel to a magnetic field? Give reason for your answer. 

 force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it. 

Two coils A and B of insulated wire are kept close to each other. Coil A is connected to a galvanometer while coil B is connected to a battery through a key. What would happen if: 

a current is passed through coil B by plugging the key?  

Explain your answer mentioning the name of the phenomenon involved.

Two coils A and B of insulated wire are kept close to each other. Coil A is connected to a galvanometer while coil B is connected to a battery through a key. What would happen if: 

the current is stopped by removing the plug from the key? 

Explain your answer mentioning the name of the phenomenon involved. 

Why is photosynthesis considered an endothermic reaction?

What are anti-oxidants? Why are they added to fat and oil containing foods?

What is an oxidation reaction? Identify in the following reaction (i) the substance oxidised, and (ii) the substance reduced:

ZnO + C → Zn + CO

In the following reaction between lead sulphide and hydrogen peroxide:

PbS (s) + 4H₂O₂(aq) → PbSO₄(s) + 4H₂O(1)

(a) which substance is reduced?
(b) Which substance is oxidised?

Identify the component oxidised in the following reaction:

H₂S + Cl₂ → S + 2HCl

When SO₂ gas is passed through saturated solution of H₂S, the following reaction occurs:

SO₂ + 2H₂S → 2H₂O + 3S

In this reaction, which substance is oxidised and which one is reduced?

Fill in the following blanks with suitable words:

The addition of oxygen to a substance is called ......... whereas removal of oxygen is called ........

Fill in the following blanks with suitable words:

The addition of hydrogen to a substance is called ........ whereas removal of hydrogen is called .......

When a magnesium ribbon burns in air with a dazzling flame and forms a white ash, is magnesium oxidised or reduced? Why?

In the reaction represented by the equation:

MnO₂ + 4HCl → MnCl₂ + 2H₂O + Cl₂

(i) name the substance oxidised.
(ii) name the oxidising agent.
(iii) name the substance reduced.
(iv) name the reducing agent.

Give an example of an oxidation reaction.

Is oxidation an exothermic or an endothermic reaction?

Give one example of an oxidation-reduction reaction which is also a combination reaction.

Give one example of an oxidation-reduction reaction which is also a displacement reaction.

Explain oxidation in terms of gain or loss of oxygen with one example.

Explain reduction in terms of gain or loss of oxygen with one example.