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21. Phosphorus vapour comprises of
a. P
b. P₂
c. P₃
d. P₄
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Answer: (d).P₄

22. Conversion of yellow phosphorous to red phosphorous is done by heating it in covered retorts at __________ °C in absence of air.
a. 50-80
b. 250-400
c. 1000-1200
d. 800-900
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Answer: (b).250-400

23. Commercial fertilisers are available mostly in the form of
a. powder
b. grannules
c. lumps
d. flakes
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Answer: (b).grannules

24. Pick out the wrong statement.
a. All the nitrogenous fertilisers are not soluble in water.
b. A straight fertiliser contains only one nutrient.
c. Calcium cynamide is used as weed killer in onion fields.
d. The phosphorous nutrient makes the plant stem stronger and increases its branches.
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Answer: (a).All the nitrogenous fertilisers are not soluble in water.

25. Ammonia synthesis gas is produced from natural gas by
a. thermal cracking
b. steam reforming
c. partial oxidation
d. hydrogenation
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Answer: (b).steam reforming

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