Acids, Bases and Salts (CBSE Class-7 Science): Questions 1 - 7 of 17

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Question number: 1

» Acids, Bases and Salts » Natural Indicators Around Us » Turmeric Natural Indicator

MCQ▾

Question

If a cooked vegetable falls on the clothes or fabric it leaves a yellow stain on cloth. This yellow stain is due to the presence of:

Choices

Choice (4) Response

a.

Indicators

b.

Bases

c.

Acids

d.

Turmeric

Question number: 2

» Acids, Bases and Salts » Neutralization » The Process of Neutralization

MCQ▾

Question

The process in which an acid reacts with a base to form salt and water is known as:

Choices

Choice (4) Response

a.

Ionisation

b.

Neutralisation reaction

c.

Hydronium ion

d.

All of the above

Question number: 3

» Acids, Bases and Salts » Acids and Bases » Bases

MCQ▾

Question

Bases are:

Choices

Choice (4) Response

a.

Soapy to touch

b.

Bitter in taste

c.

Dissociated in aqueous solution to give hydroxide ion

d.

All a. , b. and c. are correct

Question number: 4

» Acids, Bases and Salts » Acids and Bases » Indicators

MCQ▾

Question

Substances, which are used to test whether a substance is acidic or basic, are called as:

Choices

Choice (4) Response

a.

Cation

b.

Indicators

c.

Anions

d.

Litmus

Question number: 5

» Acids, Bases and Salts » Natural Indicators Around Us » Acid Rain

MCQ▾

Question

Which gases from the atmosphere combines with tiny droplets of water in clouds and leads to acid rain:

Choices

Choice (4) Response

a.

Nitrogen oxide & Sulphur dioxide

b.

Carbon dioxide

c.

Sulphur dioxide

d.

Nitrogen oxide

Question number: 6

» Acids, Bases and Salts » Acids and Bases » Indicators

MCQ▾

Question

Turmeric, litmus, China rose petals are:

Choices

Choice (4) Response

a.

Chemical indicators

b.

Natural indicators

c.

Indicators

d.

Question does not provide sufficient data or is vague

Question number: 7

» Acids, Bases and Salts » Neutralization » Phenolphthalein

MCQ▾

Question

Phenolphthalein is colourless in water but changes to pink colour when added to a:

Choices

Choice (4) Response

a.

Base

b.

Salt

c.

Acid

d.

All of the above

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