Question

29. a) How is a chemical change different from a physical change? (2+3=5)

b) Classify the following reactions into different types and give reason for your answer.

(i) H2CO3  H2O + CO2

(ii) NaOH + H2SO4  Na2SO4 + H2O

(iii) Fe + CuSO4  FeSO4 + Cu

30. a) Justify the statement ‘All alkalies are bases but all bases are not alkalies’. (2+3=5)

b) Write chemical equations for the following reactions and balance it :

(i) Nitric acid with Calcium hydroxide

(ii) Sodium hydroxide with Hydrochloric acid

(iii) Magnesium hydroxide with Sulphuric acid

OR

a) Why do we get muscle cramps after heavy exercise ?

b) Differentiate between Aerobic respiration and Anaerobic respiration. Give one example for each.

c) In plants respiration takes place with the help of two parts. Name them.
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Answer 1

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Answer 2

Answer:

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