Question

Write the answers in one sentence each.
(i) What is the pll value of pure water ?

(ii) Write the name of pigment found in leaf of green plants.

(iii) Which disease is found in human due to the deficiency of iodine ?

(iv) Write the names of two fossil fuels.

(v) Write mirror formula.
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Answer 1

Heres your answer:

(i). The pH value of pure water is 7 as it is considered neutral.

(ii).The pigment found in the leaf of green plants is chlorophyll.

(iii). Goitre is a disease caused due to iodine deficiency on our diet.

(iv). Coal amd petroleum are examples of fossil fuels.

(v). The mirror formula is as follows:
1/f = 1/v + 1/u

hope you find it helpful:)

Answer 2

1. 6.5 to 7.5

2. chlorophyll

3. goitre

4. coal and petroleum

5. 1/f = 1/v +1/u