Complete the following table: Indicator The original colour of the indicator Colour in dilute hydrochloric acid Colour in dilute sodium hydroxide Phenolphthalein _____ _____ _____ Methyl orange _____ _____ _____ Juice of red rose/ hibiscus flower _____ _____ _____

Indicator The original colour of the indicator Colour in dilute hydrochloric acid Colour in dilute sodium hydroxide Phenolphthalein colourless colourless pink Methyl orange orange red yellow Juice of red rose/ hibiscus flower light pink dark pink/magenta green Indicators change their colour in acidic or basic medium and help us to identify acids and bases. Phenolphthalein, methyl orange are synthetic indicators and juice of red rose/ hibiscus flower is a natural indicator.

E M B I B E

Science (Theory & Practical) Class-10>Chapter 2 - Acids, Bases and Salts>Exercise>Q 14

HARD

10th Chhattisgarh Board

IMPORTANT

Earn 100

What is a salt? How is the nature of a salt determined? Take ${NH}_{4} {NO}_{3}$ and ${Na}_{2} {CO}_{3}$ as examples and explain.

Important Questions on Acids, Bases and Salts

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10th Chhattisgarh Board

IMPORTANT

Science (Theory & Practical) Class-10>Chapter 2 - Acids, Bases and Salts>Exercise>Q 1

Name some indicators which help us to distinguish between acids and bases?

MEDIUM

10th Chhattisgarh Board

IMPORTANT

Science (Theory & Practical) Class-10>Chapter 2 - Acids, Bases and Salts>Exercise>Q 1

Complete the following table:

Indicator	The original colour of the indicator	Colour in dilute hydrochloric acid	Colour in dilute sodium hydroxide
Phenolphthalein	_____	_____	_____
Methyl orange	_____	_____	_____
Juice of red rose/ hibiscus flower	_____	_____	_____

EASY

10th Chhattisgarh Board

IMPORTANT

Science (Theory & Practical) Class-10>Chapter 2 - Acids, Bases and Salts>Exercise>Q 2

What will be the colour of methyl orange in dilute sulphuric acid?

MEDIUM

10th Chhattisgarh Board

IMPORTANT

Science (Theory & Practical) Class-10>Chapter 2 - Acids, Bases and Salts>Questions>Q 1

Why are copper and aluminium containers not used to store pickles?

MEDIUM

10th Chhattisgarh Board

IMPORTANT

Science (Theory & Practical) Class-10>Chapter 2 - Acids, Bases and Salts>Questions>Q 2

While eating a midday meal, some sabzi fell on Kusum's clothes. She went home and rubbed some soap on the spot which turned red. Can you give the reason for the change in colour?

HARD

10th Chhattisgarh Board

IMPORTANT

Science (Theory & Practical) Class-10>Chapter 2 - Acids, Bases and Salts>Questions>Q 3

Suresh is a visually disabled student. Which indicators can he use to identify acids and bases? Give two examples.

MEDIUM

10th Chhattisgarh Board

IMPORTANT

Science (Theory & Practical) Class-10>Chapter 2 - Acids, Bases and Salts>Questions>Q 1

Explain the reaction between metals and dilute hydrochloric acids with the help of an example.

HARD

10th Chhattisgarh Board