The conversion of free atmospheric _________ into useful nitrogenous compounds in the soil is known as fixation of atmospheric nitrogen.
Oxygen
Nitrogen
Water
Hydrogen
Con. HNO3 prepared in laboratory is
Black
Red
Orange
Yellow
--------- is a powerful oxidising agent.
H2SO4
HNO3
CH3COOH
HCl
Nitric acid is manufactured by
Contact process
Ostwald's process
Haber's process
None of these
HNO3 neutralises _________ to form salt and water.
Base
Alkali
NH3
In the free state, is found in rain water, where it occurs in traces after lightning.
Copper on reaction with dilute nitric acid produces the following oxide of nitrogen
Nitrogen dioxide
Nitrous oxide
Nitric oxide
_________ is very strong mono basic acid.
H2CO3
Which one becomes passive in concentrated nitric acid?
Iron
Copper
Silver
Lead