NCERT Class 10 Chapter 1 Chemical Reaction and Equation CBSE Board Sample Problems Very Short Answer

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Question

Write the type of reactions ¡n the following:

(i) The reaction between an acid and a base

(ii) Rusting of iron

Solution

(i) Neutralization reaction

(ii) Oxidation reaction

Question

Which one is the chemical change — Fermentation of fruit juice or diluting fruit juice?

Solution

Fermentation of fruit juice.

Question

What happens when quicklime is added to water?

Solution

Quicklime reacts with water vigorously to produce slaked lime and a large amount of heat.

Question

What is the general name of chemicals which are added to fat and oil containing food to prevent development of rancidity?

Solution

Anti-oxidants

Question

Name and state the law which is kept in mind when we balance a chemical reaction.

Solution

While balancing a chemical reaction we follow the law of conservation of mass that states 1Matter can neither be created nor be destroyed in a chemical reaction”

Question

Why do we store silver chloride in dark coloured bottles?

Solution

We store silver chloride in dark coloured bottles because it undergoes photochemical decomposition reaction in presence of sunlight.

Question

Write a balanced chemical equation to represent the chemical reaction between sodium carbonate and hydrochloric acid.

Solution

Question

Identify the oxidizing and reducing agent in the given reaction.

Solution

Oxidizing agent

Reducing agent =Fe

Question

What ¡s a redox reaction?

Solution

A reaction in which both oxidation and reduction occurs simultaneously is called a redox reaction

Question

Why do the potato chips manufacturers usually flush packets of chips with nitrogen gas?

Solution

This is done to prevent rancidity i.e. to prevent oxidation of fats and oils in chips .if oxidation of oil in which food is cooked, occurs, it spoils food resulting in bad taste and smell.

Question

Translate the following statements into chemical equations and balance them (if needed):

Lead nitrate undergoes thermal decomposition to form Lead Monoxide, Nitrogen dioxide and oxygen gas.

Quicklime combines with Carbon dioxide to form Calcium Carbonate.

Aluminum metal granule is added in Sulphuric acid to form Aluminium Sulphate and hydrogen gas.