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11th Standard English Medium Chemistry Subject Hydrogen Creative 3 Mark Questions with Solution Part - I updated Creative Questions

Published on: 13/05/2022

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Std: 11th Standard - Chemistry

chapter: - Creative Questions

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Questions:

Generic 3

5 x 3 = 15

Explain the laboratory preparation of dihydrogen.

Why is water molecule polar?

Distinguish between (i) hard water and soft water

Distinguish between (ii) temporary hardness and permanent hardness.

(i) Can marine species live in distilled water?
(ii) Can distilled water be called as deionised water?

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Answers Key:

Generic 3

5 x 3 = 15

Small amounts of hydrogen are conveniently prepared in laboratory by the reaction of metals, such as zinc, iron and tin, with dilute acid.
Zn_(s)+ 2HCl_(aq)➝ ZnCl_2(s)+ H_2(g)

Water (H₂O) is polar because of the bent shape of the molecule.

The shape means most of the negative charge from the oxygen is on one side of the molecule and the positive charge of the hydrogen atoms is on the other side of the molecule. This is an example of polar covalent chemical bonding.

HARD WATER	SOFT WATER
It contains Ca and Mg salts in it	It is free from Ca and Mg salts
It does not give lather with soap but forms a precipitate of Ca/Mg stearate	It forms lather with soap
It is harmful for boilers and is unsuitable for laundry.	It does not harm the boilers and is suitable for laundry.

TEMPORARY HARDNESS	PERMANENT HARDNESS
This is due to soluble bicarbonates of a Ca and Mg	This is due to soluble salts in the form of Ca and Mg sulphates and chlorides.
It is easily removed by boiling	Removal of permanent hardness is a tedious process and involves certain chemical methods

(i) Marine species cannot live in distilled water because it does not contain dissolved oxygen.
(ii) Distilled water is also called as deionised water, because it does not contain any cations and anions.