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Natural Indicators Around Us

Acids, Bases and Salts

Chemistry

Class 7

Overview

Classify the substances into Acids or Bases and know their chemical nature.

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Natural Indicators

5 mins

Study Materials

Acids, Bases and Salts: Neutralization, Natural Indicator, Acidity, Basicity

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Indicators

3 mins mins read

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Basics of Indicators

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Practice Questions

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Easy Medium Hard

A knife, which is used to cut a fruit, was immediately dipped into water containing drops of blue litmus solution. The colour of the solution changes to red, what is the nature of the fruit?

Medium

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Take quick lime (Calcium oxide) in a beaker containing water. Take a little of this in a test tube and show a red litmus paper.

Medium

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Sulphurous acid turns _ litmus paper __.

Medium

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A colourless salt gives violet colour to Bunsen flame and also turns moist litmus paper blue. It is

Hard

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The substances which have no effect on litmus paper are called ...................... substances.

Medium

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State whether the following statements are true or false. Correct the false statements.

Lime water turns red litmus blue.

Medium

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Define the following terms:
(a) Standard solution (b) Normal solution (c) Indicator

Medium

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What happens when blue litmus paper is dipped into chlorine water?

Medium

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A few drops of phenolphthalein indicator were added to an unknown solution A. It acquired a pink colour. Now another unknown solution B was added to it drop by drop and the solution became colourless. Predict the nature of A & B.

Hard

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What term is used in reference to an aqueous solution's osmotic pressure?

Medium

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Natural Indicators Around Us

Overview

Learn

Videos

Study Materials

Quick summary with Stories

Indicators

Revise with Concepts

Basics of Indicators

Related questions

A knife, which is used to cut a fruit, was immediately dipped into water containing drops of blue litmus solution. The colour of the solution changes to red, what is the nature of the fruit?

Take quick lime (Calcium oxide) in a beaker containing water. Take a little of this in a test tube and show a red litmus paper.

Sulphurous acid turns _ litmus paper __.

A colourless salt gives violet colour to Bunsen flame and also turns moist litmus paper blue. It is

The substances which have no effect on litmus paper are called ...................... substances.

State whether the following statements are true or false. Correct the false statements.

Lime water turns red litmus blue.

Define the following terms:
(a) Standard solution (b) Normal solution (c) Indicator

What happens when blue litmus paper is dipped into chlorine water?

A few drops of phenolphthalein indicator were added to an unknown solution A. It acquired a pink colour. Now another unknown solution B was added to it drop by drop and the solution became colourless. Predict the nature of A & B.

What term is used in reference to an aqueous solution's osmotic pressure?

More topics

Natural Indicators Around Us

Overview

Learn

Videos

Study Materials

Quick summary with Stories

Indicators

Revise with Concepts

Basics of Indicators

Related questions

A knife, which is used to cut a fruit, was immediately dipped into water containing drops of blue litmus solution. The colour of the solution changes to red, what is the nature of the fruit?

Take quick lime (Calcium oxide) in a beaker containing water. Take a little of this in a test tube and show a red litmus paper.

Sulphurous acid turns _________ litmus paper __________.

A colourless salt gives violet colour to Bunsen flame and also turns moist litmus paper blue. It is

The substances which have no effect on litmus paper are called ...................... substances.

State whether the following statements are true or false. Correct the false statements. Lime water turns red litmus blue.

Define the following terms: (a) Standard solution (b) Normal solution (c) Indicator

What happens when blue litmus paper is dipped into chlorine water?

A few drops of phenolphthalein indicator were added to an unknown solution A. It acquired a pink colour. Now another unknown solution B was added to it drop by drop and the solution became colourless. Predict the nature of A & B.

What term is used in reference to an aqueous solution's osmotic pressure?

More topics

Sulphurous acid turns _ litmus paper __.

State whether the following statements are true or false. Correct the false statements.

Lime water turns red litmus blue.

Define the following terms:
(a) Standard solution (b) Normal solution (c) Indicator