Question

SECTION A
What are the changes observed when a few grams of quick lime is added to water?
OR
1
What happens when Copper sulphate solution is poured into a silver bowl? Explain.
How would you get Plaster of Paris from Gypsum salt?
2

3

Which of the following pair make Homologous series? Define Homologous series.
(a) CH4, C2H5
(b) C3H6, C4H8
(c) C2H4, C3H5
(d) C5H1o' C6H10
Sunlight causes rainbow after a rain shower. Give reason

14
.
Power of Spectacle lens is said to be -2D. What does the statement mean?

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Answer 1

Answer:

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Answer 2

Answer:

1. When water is added to quick lime, a suspension of slaked lime is formed

OR

Silver is less reactive than copper hence no reaction takes place

2. Plaster of paris is prepared by heating calcium sulfate dihydrate, or gypsum

3. I am not sure about the 3rd one but i think its option B