Complete the following table: S.No. Test Solution Indicator that can be used Initial colour of the test solution Final colour of the test solution 1 Lemon juice Blue litmus Colourless Red 2 Vinegar Colourless 3 Milk of magnesia Phenolphthalein White 4 Soda water Red 5 Baking soda solution Colourless Blue 6 Orange juice Blue litmus Orange 7 Soap solution Colourless Magenta 8 Shampoo (dilute) Turmeric solution Colourless

S.No. Test Solution Indicator that can be used Initial colour of the test solution Final colour of the test solution 1 Lemon juice Blue litmus Colourless Red 2 Vinegar Blue litmus Colourless Red 3 Milk of magnesia Phenolphthalein White Magenta 4 Soda water Blue litmus Colourless Red 5 Baking soda solution Red litmus Colourless Blue 6 Orange juice Blue litmus Orange Red 7 Soap solution Phenolphthalein Colourless Magenta 8 Shampoo (dilute) Turmeric solution Colourless Red Turmeric solution, litmus solution, red cabbage extract and china rose extract are some natural indicators. Phenolphthalein and methyl orange are some synthetic indicators. Litmus solution turns red in acidic medium and turns blue in basic medium. Phenolphthalein is colourless in acidic and neutral medium and turns magenta in basic medium. Yellow turmeric solution turns to brick red in basic medium.

E M B I B E

Expanded Universal Science 7>Chapter 6 - Acids, Bases and Salts>ASSESSMENT ZONE>Q B

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7th CBSE

IMPORTANT

Earn 100

Wasp sting is in nature.

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Important Questions on Acids, Bases and Salts

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7th CBSE

IMPORTANT

Expanded Universal Science 7>Chapter 6 - Acids, Bases and Salts>ASSESSMENT ZONE>Q C

I am an organic acid found in lemon.

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7th CBSE

IMPORTANT

Expanded Universal Science 7>Chapter 6 - Acids, Bases and Salts>ASSESSMENT ZONE>Q C

I am a salt used by your mother when she makes cookies and cakes for you.

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7th CBSE

IMPORTANT

Expanded Universal Science 7>Chapter 6 - Acids, Bases and Salts>ASSESSMENT ZONE>Q C

I am a neutral substance you drink every day.

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7th CBSE

IMPORTANT

Expanded Universal Science 7>Chapter 6 - Acids, Bases and Salts>ASSESSMENT ZONE>Q C

Doctor recommends me to take this when you overeat and suffer from indigestion. (Antacid / Antibiotic)

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7th CBSE

IMPORTANT

Expanded Universal Science 7>Chapter 6 - Acids, Bases and Salts>ASSESSMENT ZONE>Q C

I am present in the sting of an ant. (Acetic acid / Formic acid)

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7th CBSE

IMPORTANT

Expanded Universal Science 7>Chapter 6 - Acids, Bases and Salts>ASSESSMENT ZONE>Q D

Complete the following table:

S.No.	Test Solution	Indicator that can be used	Initial colour of the test solution	Final colour of the test solution
1	Lemon juice	Blue litmus	Colourless	Red
2	Vinegar		Colourless
3	Milk of magnesia	Phenolphthalein	White
4	Soda water			Red
5	Baking soda solution		Colourless	Blue
6	Orange juice	Blue litmus	Orange
7	Soap solution		Colourless	Magenta
8	Shampoo (dilute)	Turmeric solution	Colourless