1.
Percentage of hydrogen in the air is

2.
Which of the following have an impact on brain development in human beings especially among children?

3.
Which of the following is true about ozone?

4.
Which of the following is a powerful irritant which can aggravate the symptoms of people who suffer from respiratory disorders?

5.
What is meant by the term 'meso'?

6.
Which of the following is further divided into two layers?

7.
Group of chemically unreactive compounds that are commonly used as solvents are called

8.
Which of the following is produced when dead plant material decays in the absence of air?

9.
Which two main gases are produced when you burn a piece of wood?

10.
The occurrence of weather is in

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