Which of the following is not a method of preparing oxygen?
A). Electrolysis of water
B). Fractional distillation of liquid air
C). Decomposition of potassium permanganate
D). Decomposition of manganese dioxide
Decomposition of manganese dioxide
One of the two chemical methods starts from natural manganese dioxide and converts it using dinitrogen tetroxide and water to manganese nitrate solution. Evaporation of the water leaves the crystalline nitrate salt. At temperatures of 400°C, the salt decomposes, releasing N2O4 and leaving a residue of purified manganese dioxide.
1. One of the constituents of tear gas is
2. The ratio of pure gold in 18 carat gold is
4. Rate of diffusion of a gas is -
5. Question 15.5:Define the term polymerisation.
6. The Fungus which is used in the alcohol industry is .
7. A polymeric substance used to make parachute is
8. The Bhopal tragedy was caused by the gas
9. The ‘Green House effect’ is produced due to the presence of excess amount of