Difficult Questions
4 min read

Hydrogen

- Hard questions with simple solutions.
1
How well can you calculate temporary and permanent hardness when the variables given are the quantities of , and ?
kg of a sample of water contains mg of  and mg of . Its permanent hardness and temporary hardness in ppm are respectively:
A
B
C
D
2
There are different methods of preparation of hydrogen. You can expect questions on any aspect of the preparation process. See if you can answer this question correctly.
Very pure hydrogen can be made by which of the following processes?
A
Reaction of methane with steam
B
Mixing natural hydrocarbons of high molecular weight
C
Electrolysis of water
D
Reaction of salt like hydrides with water
3
Hydride ion is a stronger base than hydroxide ion . Can you solve this question based on the given fact?
Hydride ion is a stronger base than hydroxide ion . In the light of the above fact, which of the following reactions will take place if is dissolved in water?
A
B
C
D
No reaction
4
This question is on the removal of hardness of water. Can you calculate the amount of needed to remove hardness when the amount of water and calcium bicarbonate is given?
Number of moles of required to remove hardness from litre water having ppm of calcium bicarbonate.
A
B
C
D