Q.4. Write the answer in one sentence each:
(a) What is the pH value of pure water.
(b) Write the name of pigment found in leaf of green plants.
(c) Which disease is found in human due to the deficiency of iodine ?
(d) Write the names of two fossil fuels.
(e) Write mirror formula.
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Answer i: The pH value of pure water is 7.
Answer ii: The name of pigment found in leaf of green plants is Chlorophyll.
Answer iii: The disease found in human due to the deficiency of iodine is Goitre.
Answer iv: Coal and Petroleum
Answer v: Mirror Formula – 1/f = 1/u + 1/u
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