The gas which is mainly responsible for the greenhouse effect is:
1). Ozone
2). Oxygen
3). Carbon dioxide
4). Carbon monoxide
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1. What is "milk of magnesia' chemically ?
2. The washing machine works on the principle of ____________
3. Which one of the following is known as the brown coal ?
4. What is the most common salt in sea water ?
5. Which of the following is used as filler in tyre of rubber
6. The lustre of the metals is because of
7. Which of the following is an ore of iron?