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16. Pick out the wrong statement.
a. Yellow phosphorous which is the most reactive allotropic form of phosphorous is transported under water.
b. Apatite is the principal material present in phosphate rock which is chemically Ca₁₀ (PO₄)₆ (F, Cl, OH).
c. Urea is more hygroscopic than ammonium nitrate.
d. Nitrogen fixation means the process of bringing atmospheric nitrogen into combination i.e. into nitrogen compound form.
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Answer: (c).Urea is more hygroscopic than ammonium nitrate.

17. Which of the following does not come under the category of 'secondary nutrient' for plant growth?
a. Calcium
b. Magnesium
c. Sulphur
d. Oxygen
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Answer: (d).Oxygen

18. Steam reforming of naphtha is a source of hydrogen production for nitrogeneous fertiliser industry. What is the usual ratio of steam to carbon maintained in the process of steam reforming of naphtha ?
a. 1.5:1
b. 3.5:1
c. 10:1
d. 15:1
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Answer: (b).3.5:1

19. (CH₃C₆H₄)₃PO₄ is the chemical formula of
a. triple superphosphate
b. tricresyl phosphate
c. flourapatite
d. superphosphate
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Answer: (b).tricresyl phosphate

20. Which is a catalyst promoter used in catalytic ammonia synthesis reaction ?
a. Al₂O₃
b. Cr₂O₃
c. K₂O
d. MnO
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Answer: (c).K₂O

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