Question

TICK ( ) THE MOST APPROPRIATE ANSWER :
1. Henry Cavendish obtained hydrogen gas by adding sulphuric acid to
(a) Zinc
(b) Potassium
(c) Aluminium
(d) Iron.
2. Which gas is used for filling in the packets of chips?
(a) Fluorine
(b) Chlorine
(c) Hydrogen
(d) Nitrogen
3. Nutrients that help us to grow and build our body are :
(a) Carbohydrates
(b) Fats
(c) Proteins
(d) Roughage.
4. Food like potatoes contain:
(a) Cellulose
(b) Lactose
(c) Starch
(d) Sucrose
5. Cloth is made from thin thread like material called :
(a) Fibres
(b) Polymers
(c) Monomers
(d) Fabrics​

Answer 1

Answer:

1)  Henry Cavendish obtained hydrogen gas by adding sulfuric acid to zinc.

Therefore, the correct option is (a) Zinc.

2) The gas used for filling in the packets of chips is nitrogen.

Therefore, the correct option is (d) Nitrogen.

3) The nutrients that help us to grow and build our bodies are proteins.

Therefore, the correct option is (c) Proteins.

4) Food like potatoes contains sucrose.

Therefore, the correct option is (d) sucrose.

5) The cloth is made from a thin thread-like material called fibre.

Therefore, the correct option is (a) Fibres.

Explanation:

1) Henry Cavendish obtained hydrogen gas by adding sulfuric acid to:

• Henry Cavendish accidentally obtained hydrogen, when he poured dilute sulfuric acid on Zinc granules.
• As a result, zinc is more reactive than hydrogen and replaces hydrogen and forms zinc sulfate.
• $Zn + H_{2}SO_{4} \rightarrow ZnSO_{4} + H_{2}$

Therefore, the correct option is (a) Zinc.

2)  Which gas is used for filling in the packets of chips?

• The gas used for filling in the packets of chips is nitrogen.
• Because nitrogen is an inert gas, it prevents the oil's oxidation present in the chips.
• Nitrogen itself does not react with the food items, unlike other gases fluorine, chlorine, hydrogen and oxygen which are very reactive and combine with other molecules.

Therefore, the correct option is (d) Nitrogen.

3) Nutrients that help us to grow and build our body are :

• Carbohydrates and fats are the most important sources of energy for the body of many organisms.
• Proteins help in the building and repairing of body tissues. Proteins are organic molecules and are made up of amino acids ( the building blocks of life).
• Roughage helps in the movement of food through the alimentary canal.

Hence, the nutrients that help us to grow and build our bodies are proteins.

Therefore, the correct option is (c) Proteins.

4)  Food like potatoes contain:

• Cellulose is a water-insoluble polysaccharide. It is the raw material of many things (like paper, rayon, and cellophane)
• Lactose is found in dairy products like milk, yoghurt, and cheese.
• Starch is the storage house of carbohydrates in plants.
• Sucrose is naturally occurring in fruits and vegetables. It is found in sweet potatoes and honey.

Hence, food like potatoes contains sucrose.

Therefore, the correct option is (d) sucrose.

5) Cloth is made from thin thread-like material called :

• Fibres are thread-like structures used to make fabric.

• Polymers and monomers are synthetic substances composed of many simpler units.
• Fabrics are made up of fibres.

Hence, the cloth is made from a thin thread-like material called fibre.

Therefore, the correct option is (a) Fibres.