Short Answer Type Questions
1. Give examples of some acids and bases.
ans
2. What is the use of litmus test?
ans
3. Reena is trying to wash a turmeric stain on her cloth with soap. She notices the stain
colour changing to red. Explain why.
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4. What do you understand by the term neutralization? Describe an activity in which
neutralization of hydrochloric acid takes place with sodium hydroxide, using
phenolphthalein as an indicator.
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5. Explain why :
(a) Farmers add quick lime to acidic soils.
(b) Soap solution or baking soda paste is applied on the part of the body stung by a bee.
(c) Factory wastes and city sewerage are neutralized before discharging in rivers.
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6. How will you treat the high acidity in the stomach?
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please give me right right right answer answer please friends please fast
class 7
Answers
1) ACIDS :- Lemons, oranges, vinegar, urine, sulfuric acid, hydrochloric acid.
BASE :- Soap, toothpaste, bleach, cleaning agents.
2) The main use of litmus test is to check whether a solution is acidic or basic in nature.
3) Turmeric is an indicator which gives red colour with a base since soap is a base so we get red colour
4) Neutralisation is a chemical reaction in which acid and a base react quantitatively with each other. In a reaction in water, neutralization results in there being no excess of hydrogen or hydroxide ions present in the solution.
ACTIVITY :-
when acid and base react with each other they neutralizes each other and gives water and salt. HCl+NaOh=H2O+NaCl. after neutralization the solution doesn't change its colour when reacted with phenolphthalein because neutral have PH value 7 and on PH value 7 phenolphthalein is colorless.
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