Acids, Bases and Salts Online Test

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Acids, Bases and Salts

Description: Acid, Base and Salts
Number of Questions: 17
Created by: Sundari Chatterjee
Tags: Science Class 7 Acids, Bases and Salts Common Acids and Bases Around Us Natural Indicators Around Us Characteristics of Acids, Bases and Indicators

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The nucleus of any living cell contains ______________________.

deoxyribonucleic acid
amino acid
tartartic acid
fatty acid
citric acid

Match the following:


a. Lemons	1. Oxalic acid
b. Goose berries	2. Citric acid
c. Tomato	3. Tartartic acid

a - 2, b - 1, c - 3
a - 2, b - 3, c - 1
a - 1, b - 3, c - 2
a - 1, b - 2, c - 3
a - 3, b - 2, c - 1

If the yellow stain of turmeric is rubbed with soap solution, the colour of stain changes to brownish red. It happens due to the presence of a chemical called _______________ in the soap solution.

potassium hydroxide
sodium hydroxide
calcium hydroxide
ammonium hydroxide
magnesium hydroxide

_______________ help in the development, growth and repair of the body cells.

Fatty acids
Formic acid
Amino acids
Citric acid
Oxalic acid

The sting of ants and bees contain ___________, which when injected causes painful irritation and swelling.

formic acid
sulphuric acid
hydrochloric acid
oxalic acid
lactic acid

Match the following acids with their sources:


a. Malic acid	1. Sour milk
b. Acetic acid	2. Apples
c. Lactic acid	3. Proteins
d. Amino acid	4. Vinegar

a - 2, b - 4, c - 1, d - 3
a - 2, b - 4, c - 3, d - 1
a - 4, b - 2, c - 1, d - 3
a - 3, b - 4, c - 1, d - 2
a - 2, b - 1, c - 4, d - 3

Which of the following is not an indicator?

Turmeric
Litmus
Phenolphthalein solution
Alcohol
China rose paper

Which of the following is a mineral acid?

Formic acid
Amino acid
Malic acid
Nitric acid
Acetic acid

Which of the following statements is / are false:

(a) The neutral litmus solution turns red when added to some acidic solution. (b) Turmeric, as an indicator identifies acidic solutions only. Its colour does not change in basic solutions. (c) The litmus dye is extracted from lichen plants found in Tundra region.

only (a)
(a) and (b)
only (b)
(a) and (c)
only (c)

Which of the following is an organic acid?

Hydrochloric acid
Sulphuric acid
Phosphoric acid
Oxalic acid
Boric acid

Match the following acids with their formulae:


1. Phosphoric acid	a. HCL
2. Nitric acid	b. H₃PO₄
3. Hydrochloric acid	c. H₂SO₄
4. Sulphuric acid	d. HNO₃

1 - b, 2 - a, 3 - d, 4 - c
1 - c, 2 - d, 3 - a, 4 - b
1 - d, 2 - b, 3 - a, 4 - c
1 - b, 2 - d, 3 - c, 4 - a
1 - b, 2 - d, 3 - a, 4 - c

The pink colour of china rose solution does not change in colour, when treated with the solution of ___________________.

aerated water
nitric acid
common salt
baking soda
lime water

Match the following:


a. When used as an indicator, the colour of solution of china rose changes to green in	1. neutral solutions
b. When used as an indicator, the colour of solution of china rose does not changes its colour in	2. acidic solutions
c. When used as an indicator, the colour of solution of china rose changes to magenta in	3. basic solutions

a - 3, b - 1, c - 2
a - 2, b - 1, c - 3
a - 1, b - 3, c - 2
a - 3, b - 2, c - 1
a - 2, b - 3, c - 1

Phenolphthalein, when added to _______________ , will remain colourless.

soap
shampoo
baking soda
lime water
lemon juice

Which of the following is not a physical property of bases?

All bases are slippery to touch.
Bases turn red litmus solution black.
They have a bitter taste.
Bases turn phenolphthalein solution pink.
Bases like sodium hydroxide, potassium hydroxide are corrosive in nature.

Match the following:


Name of base	Found in	Chemical formula
1. Ammonium hydroxide	a. Limewater	p. Mg(OH)₂
2. Magnesium hydroxide	b. Window cleaner solution	q. KOH
3. Calcium Hydroxide	c. Liquid soap	r. Ca(OH)₂
4. Potassium hydroxide	d. Milk of magnesia	s. NH₄OH

1 - b - s, 2 - d - p, 3 - a - q, 4 - c - r
1 - b - s, 2 - d - p, 3 - a - r, 4 - c - q
1 - b - p, 2 - d - s, 3 - a - r, 4 - c - q
1 - d - s, 2 - b - p, 3 - a - r, 4 - c - q
1 - b - s, 2 - d - p, 3 - c - r, 4 - a - q

Which of the following is not a physical property of acids?

They turn blue litmus solution red.
They have a sweet taste.
They do not affect turmeric solution.
They do not affect phenolphthalein solution.
They are highly corrosive.

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