Following questions consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below: (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is not the correct explanation of A. (c) A is true but R is false. (d) A is false but R is true.
Q. 7 Assertion-Litmus solution is a natural acid base indicator. Reason-It is a purple dye which is extracted from a plant called Lichen.
Q. 8 Assertion- Galvanisation is the process of applying a protective zinc coating to iron or steel, to prevent rusting. Reason- For rusting presence of Hydrogen and Carbon di oxide is essential.
Answers
Answer:
(a) Both A and R are true and R is the correct explanation of A.(b) Both A and R are true but R is not the correct explanation of A.(c) A is true but R […]
7)Litmus solution is a purple dye which is extracted from lichen and is commonly used as an indicator.
2) Red cabbage leaves , turmeric coloured petals of some flowers indicate the presence of acid or base in a solution.
3) Some substances whose odour changes in acidic or basic medium are called olfactory indicators.
8)Zinc
Galvanization is the method of coating iron with zinc to prevent rusting. Hot dip electroplating method is used to apply zinc coating. Zinc prevents the formation of layer of oxide on the iron which in the presence of air and water leads to rust formation.
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