Match the Columns: Column A Column B 1. Curd A. Weak base 2. Ammonium hydroxide B. Hydroxides of Al and Mg 3. Antacid C. Formic acid 4. Ant sting D. Weak base 5. Aluminium hydroxide E. Lactic acid

1. The acid present in curd is lactic acid. Curd forms due to the chemical reaction between lactic acid bacteria and milk protein casein. 2. Ammonium hydroxide is a weak base because it does not dissociate completely into ions. 3. Hydroxides of Al and Mg are known as antacids used together to relieve heartburn, acid indigestion and upset stomach. 4. The acid which ants produce is called formic acid. The chemical formula of formic acid is HCOOH . It is an anti injects acid it causes a burning sensation. 5. Aluminium hydroxide is a weak base because it does not dissociate completely into ions. Column A Column B 1. Curd E. Lactic acid 2. Ammonium hydroxide A. Weak base 3. Antacid B. Hydroxides of Al and Mg 4. Ant sting C. Formic acid 5. Aluminium hydroxide D. Weak base

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Science 7>Chapter 5 - Acids, Bases and Salts>FORMATIVE & SUMMATIVE ASSESSMENTS>Q 3

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Write one word for the following:
A base used in whitewashing. (Calcium hydroxide/ Magnesium hydroxide)

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Important Questions on Acids, Bases and Salts

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Science 7>Chapter 5 - Acids, Bases and Salts>FORMATIVE & SUMMATIVE ASSESSMENTS>Q 4

A substance that changes its colour when added to an acid or a base.

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Science 7>Chapter 5 - Acids, Bases and Salts>FORMATIVE & SUMMATIVE ASSESSMENTS>Q 5

A natural indicator which is pink in neutral solution and changes to green in basic solution.

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Science 7>Chapter 5 - Acids, Bases and Salts>FORMATIVE & SUMMATIVE ASSESSMENTS>MATCH THE COLUMNS

Match the Columns:

Column A	Column B
1. Curd	A. Weak base
2. Ammonium hydroxide	B. Hydroxides of $Al$ and $Mg$
3. Antacid	C. Formic acid
4. Ant sting	D. Weak base
5. Aluminium hydroxide	E. Lactic acid