Class 7 Science Chapter 5 Acids, Bases and Salts

Last updated on August 30th, 2023 at 01:00 am

1. All four
2. (a) and (d)
3. (b) and (c)
4.  Only (d)

Answer:

2 (a) and (d)

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Fill in the blanks:-

1. Chemical fertilisers make the soil …………
2. A ………… occurs when an acid and a base are mixed 
3. Neutralisation of acids and bases results in the formation of …….and ………….
4. Acid + Base ⎯ →⎯ ………………. + Water
5. Hydrochloric acid + Sodium hydroxide ⎯ →⎯ …………… + Water
6. An …………. is used to determine whether a substance is acidic or basic.
7. Acidic, basic, and neutral solutions produce different colours of substances called ………….

Answers:

1. Acidic 
2. Neutralisation 
3. Salt ; Water 
4. Salt 
5. Sodium Chloride 
6. Indicator 
7. Indicators

 

Fill in the blanks:-

1. …………. is a common name for sodium bicarbonate. [ Baking soda]
2. …………. in lemon juice causes a blue litmus paper to turn red.[Citric acid]
3. When a liquid turns blue litmus red, it is an ………[acid.]
4. ……..is made from Caustic soda (sodium hydroxide). [Soap]
5. Salt is a mixture of ……..and ………….. [acids , bases]
6. …………acid is present in milk.[Lactic]