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11.

Which one of the following substances is used as a nitrogenous fertilizer as a weed killer in the onion fields and for correcting acidic soils?

A.	Urea	B.	Basic slag
C.	Superphosphate of lime	D.	Calcium cyanamide

12.

The best fertilizer for rice paddies is

A.	urea	B.	ammonium sulphate
C.	superphosphate	D.	calcium ammonium nitrate

13.

Which one of the following compounds is not used as fertilizer?

A.	Urea	B.	Dismmonium phosphate
C.	Ammonium nitrate	D.	Calcium phosphate

14.

In the Habers process for the manufacture of ammonia

A.	finely divided iron is used as a catalyst	B.	finely divided molybdenum is used as a catalyst
C.	finely divided nickel is used as a catalyst	D.	no catalyst is required

15.

If a mixture containing 3 moles of hydrogen and 1 mole of nitrogen is converted completely in ammonia the ration of initial and final volumes at the same temperature and pressure would be

A.	three : one	B.	two : one
C.	one : three	D.	one : two

16.

The favourable conditions for the maximum yield of ammonia by Habers process are

A.	high pressure hight temperature high concentrations of reactants	B.	low pressure low temperature low concentrations of reactants
C.	high pressure low temperature high concentrations of reactants	D.	high pressure low temperature low concentrations of reactants

17.

All NH3 synthesis catalysts are based on iron oxide promoted by

A.	SiO2	B.	K2O (1-2%)
C.	ZnO	D.	V2O5

18.

Synthetic ammonia is produced by reacting nitrogen and hydrogen gases. The reaction is

A.	endothermic	B.	exothermic
C.	irreversible	D.	catalyzed by enzymes

19.

The nutrient which makes the plant stems stronger and increases branching is

A.	N	B.	P
C.	K	D.	Zn

20.

Nitric acid is generally light yellow in colour due to the presence of

A.	NH3	B.	NO
C.	NO2	D.	N2O5