NCERT Class 7 Science Chapter 5 Acids, Bases and Salts Extra Questions and Answers
Class 7 Science Chapter 5 Extra Questions and Answers – Acids, Bases and Salts. Here in this Page Class VII Students can Learn Extra Questions & Answer 5th Chapter Science fully Inside.
We Provided Here Acids, Bases and Salts Science Chapter 5 Long Answer Type Question, Very Short Type Questions (VSA) / MCQ Type Questions, Short Type Questions (SA).
Class 7 Science Chapter 5 Extra Question with Answer – Acids, Bases and Salts
Science Chapter 5 Acids, Bases and Salts Class 7 Inside 5 Marks, 3 marks, 2 Marks & And 1 Marks Important Questions and Answers.
1) Fill in the blanks:
a) ___ turns blue litmus red.(Acid)
b) ___acid is found in curd.(Lactic)
c) ___hydroxide is found in window cleaner.(Ammonium)
d) Citric acid is found in ___.(Lemon)
e) Litmus is extracted from ____. (Lichens)
2) Multiple choice questions:
a) ___acid is found in Vinegar?
a) Ascorbic b) Lactic c) Acetic
Ans. c) Acetic
b) ____acid helps us to digest food?
a) Nitric b) Hydrochloric
Ans. b) Hydrochloric
c) The reaction between an ___ and a ___ is known as Neutralization?
a) Acid & Neutral b) Base & Neutral c) Acid & Base
Ans. c) Acid & Base
d) ___ turn red litmus blue?
a) Bases b) Acid
Ans. a) Bases
e) ___acid is found in amla?
a) Ascorbic b) Lactic c) Acetic
Ans. a) Ascorbic
3) Answer the following questions:
a) What are neutral substances? Give two example.
Ans. The substances which are neither acidic nor basic are called neutral substances.
Example – Water and sugar
b) What are indicators? Give two examples.
Ans. The solutions of substances that show different color in acidic, basic and neutral solutions are called indicators.
Example – litmus and turmeric.
c) Differentiate between acid and base.
Ans. 1. Acids are sour in taste while bases are bitter in taste.
In case you are missed :- Previous Chapter Extra Questions
2.) Acid turns blue litmus paper red while bases turn red litmus paper blue.
d) Why should the factory waste neutralize before disposing it into the water body?
Ans. The waste of many factories contain acids. If they are allowed to flow into the water bodies, the acids will kill fish and other organisms. The factory waste should, therefore, neutralize before disposing it into the water body.
4) Match the following:
Column I Column II
a) Calcium hydroxide 1) Found in spinach
b) Sodium hydroxide 2) Found in grapes
c) Tartaric acid 3)Found in milk of magnesia
d) Oxalic acid 4) Found in Lime water
e) Magnesium hydroxide 5) Found in soap
Ans. a) –4), b) – 5), c) – 2), d) – 1), e) – 3)
5) Mark your answer as per the codes provide below (Assertion Reason):
a) A: Great care should be taken while handling laboratory acids and bases.
R: Laboratory acids and bases are corrosive in nature, irritating and harmful to skin.
I.) Both A and R are true and R is the correct explanation of A.
II.) Both A and R are true but R is not the correct explanation of A.
III.) A is true but R is false.
IV.) A is false but R is true.
V.) Both A and R are false.
Ans. I. Both A and R are true and R is the correct explanation of A.
b) A: Vinegar is sour in taste.
R: Vinegar contains base.
I.) Both A and R are true and R is the correct explanation of A.
II.) Both A and R are true but R is not the correct explanation of A.
III.) A is true but R is false.
IV.) A is false but R is true.
V.) Both A and R are false.
Ans. III. A is true but R is false.
Case Study Questions
6) When an ant bites, it injects the acidic liquid into the skin. The effect of the acid can be neutralized by rubbing moist baking soda or calamine solution, which contains zinc carbonate.
a) When an ant bites, it injects ___acid into the skin. (Formic)
b) Why do we apply calamine solution on skin when an ant bites?
Ans. When an ant bites, we rub calamine solution on skin to neutralize the effect of the acid that the ant injects.
In case you are missed :- Next Chapter Extra Questions