The major harmful gas emitted by automobile vehicles which causes air pollution is
1). Carbon Monoxide
2). Methane
3). Carbon dioxide
4). Ozone gas
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1. The first metal used by a man was
2. Formation of ozone hole is maximum over
5. The cathode of a lead storage battery is made up of
6. Byproduct obtained by soap industry is
7. Which of the following is not a precious/semi-precious stone?
8. The inexpensive and commonly used variety of glass is called soda glass. It is called so because