1.
Which of the following gases is present under pressure in soft drinks?

2.
If we burn graphite,

3.
Lead pencil contains

4.
Highest percentage of carbon is found in which form of coal?

5.
The main source of carbon monoxide is

6.
Highly toxic gas which causes headache, visual difficulty, paralysis and even death is

7.
Water gas is the combination of

8.
The gas that causes suffocation and death when coal or coke is burnt in a closed room is

9.
Which one is not a pure form of carbon?

10.
Which one is the purest form of carbon?