Rancidity can be defined as the chemical decomposition of oils and fats when exposed to air, light, moisture, and bacterial activity in food and other products making them undesirable for consumption. It can be prevented by the following methods: The packing of food materials should replace the air with Nitrogen. The food materials should be placed at very low temperatures. The addition of antioxidants also prevents rancidity process.

The process of oxidation of fats and oils which can be noticed by a change in colour, smell, and taste is known as rancidity. Rancidity, condition produced by aerial oxidation of unsaturated fat present in foods and other products, marked by unpleasant odour or flavour. The process of oxidation of fats and oils which can be noticed by a change in colour, smell, and taste.

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The following factors play vital role in corrosion process.

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Important Questions on Chemical Reactions and Equations

EASY

Science>Chemistry>Chemical Reactions and Equations>Redox Reactions

Which of the following gases can be used for storage of fresh sample of an oil for a long time?

MEDIUM

Science>Chemistry>Chemical Reactions and Equations>Redox Reactions

Write the short note on:

Corrosion

MEDIUM

Science>Chemistry>Chemical Reactions and Equations>Redox Reactions

Fatty foods become rancid due to process of

HARD

Science>Chemistry>Chemical Reactions and Equations>Redox Reactions

In a double displacement reaction such as the reaction between sodium sulphate solution and barium chloride solution:

(A) exchange of atoms takes place.

(B) exchange of ions takes place.

(D) an insoluble salt is produced.

The correct option is:

EASY

Science>Chemistry>Chemical Reactions and Equations>Redox Reactions

Which gas is used as preservatives in the juice of fruits, in jam, and drying of fruits?

MEDIUM

Science>Chemistry>Chemical Reactions and Equations>Redox Reactions

Decomposition reactions require energy either in the form of heat or light or electricity for breaking down the reactants. Write one equation each for decomposition reactions where energy is supplied in the form of heat, light, and electricity.

MEDIUM

Science>Chemistry>Chemical Reactions and Equations>Redox Reactions

Define rancidity

HARD

Science>Chemistry>Chemical Reactions and Equations>Redox Reactions

What would a student report nearly after

30

minutes of placing duly cleaned strips of aluminium, copper, iron and zinc in freshly prepared iron sulphate solution taken in four beakers?

MEDIUM

Science>Chemistry>Chemical Reactions and Equations>Redox Reactions

Silver articles when exposed to the air gradually turn blackish. Give reason.

MEDIUM

Science>Chemistry>Chemical Reactions and Equations>Redox Reactions

Manufacture of chips, flush the packets of chips with nitrogen gas. Why?

EASY

Science>Chemistry>Chemical Reactions and Equations>Redox Reactions

What is observed when a solution of sodium sulphate is added to a solution of barium chloride taken in a test tube ? Write equation for the chemical reaction involved and name the type of reaction in this case.

EASY

Science>Chemistry>Chemical Reactions and Equations>Redox Reactions

Oil and fat containing food items are flushed with nitrogen. Why?

HARD

Science>Chemistry>Chemical Reactions and Equations>Redox Reactions

1 g

of copper powder was taken in a China dish and heated. What change takes place on heating? When hydrogen gas is passed over this heated substance, a visible change is seen in it. Give the chemical equations of reactions, the name and the colour of the products formed in each case.

MEDIUM

Science>Chemistry>Chemical Reactions and Equations>Redox Reactions

The colour of

{NO}_{2}

and

PbO

formed when lead nitrate is heated are:

EASY

Science>Chemistry>Chemical Reactions and Equations>Redox Reactions

On heating blue coloured powder of copper (II) nitrate in a boiling tube, black copper oxide,

O_{2}

and a brown gas X is formed.
(a) Identify the type of reaction and the gas X.
(b) Write balanced chemical equation of the reaction.
(c) Write the

pH

range of aqueous solution of the gas X.

MEDIUM

Science>Chemistry>Chemical Reactions and Equations>Redox Reactions

When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remains in the solution. The reaction is an example of a :

MEDIUM

Science>Chemistry>Chemical Reactions and Equations>Redox Reactions

What is observed when a pinch of sodium hydrogen carbonate is added to