Bases

Author:S K Jain & Shailesh K Jain
7th CBSE
IMPORTANT

Important Questions on Bases

HARD
IMPORTANT
Science 7>Acids, Bases and Salts>Bases> Q 1

Soaps are salts. Discuss the structure of soap molecules.

MEDIUM
IMPORTANT
Science 7>Acids, Bases and Salts>Bases> Q 2

Choose the odd-one-out giving reason:
Magnesium hydroxide, Ammonium hydroxide, Antacid, Aluminium hydroxide
 

MEDIUM
IMPORTANT
Science 7>Acids, Bases and Salts>Bases> Q 3

Aluminium hydroxide is an alkali.

HARD
IMPORTANT
Science 7>Acids, Bases and Salts>Bases> Q 4

Ammonium hydroxide is a strong base.

MEDIUM
IMPORTANT
Science 7>Acids, Bases and Salts>Bases> Q 5

Baking soda turns
 

MEDIUM
IMPORTANT
Science 7>Acids, Bases and Salts>Bases> Q 6

A base
 

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IMPORTANT
Science 7>Acids, Bases and Salts>Bases> Q 7

Write one word for the following:
A base used in whitewashing. (Calcium hydroxide/ Magnesium hydroxide)

MEDIUM
IMPORTANT
Science 7>Acids, Bases and Salts>Bases> Q 8

Write one word for the following:

The bases which dissolve in water.

MEDIUM
IMPORTANT
Science 7>Acids, Bases and Salts>Bases> Q 9

Define: Acid-base indicators 
 

MEDIUM
IMPORTANT
Science 7>Acids, Bases and Salts>Bases> Q 10

Mention two uses of magnesium hydroxide.

MEDIUM
IMPORTANT
Science 7>Acids, Bases and Salts>Bases> Q 11

Mention two uses of ammonium hydroxide.
 

HARD
IMPORTANT
Science 7>Acids, Bases and Salts>Bases> Q 12

What is the nature of a solution of washing soda? How will you confirm it?
 

MEDIUM
IMPORTANT
Science 7>Acids, Bases and Salts>Bases> Q 13

Write two characteristics of bases.

HARD
IMPORTANT
Science 7>Acids, Bases and Salts>Bases> Q 14

Which of the following is not an alkali?

Sodium hydroxide, Calcium hydroxide, Aluminium hydroxide.

HARD
IMPORTANT
Science 7>Acids, Bases and Salts>Bases> Q 15

Name a base used for the softening of water. (Calcium hydroxide/ magnesium hydroxide)

MEDIUM
IMPORTANT
Science 7>Acids, Bases and Salts>Bases> Q 16

Describe the following properties of a base: Taste and Touch.

MEDIUM
IMPORTANT
Science 7>Acids, Bases and Salts>Bases> Q 17

Which bases are called alkalis?