Carbon monoxide is an inflammable gas. Which one of the following is also inflammable?
1). Helium
2). Nitrogen
3). Oxygen
4). Hydrogen
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1. Ultraviolet radiation striking this earth is due to the depletion of
2. Which one of the following does not form oxyacid ?
3. The element with highest first ionisation energy is
4. Petroleum consists of a mixture of
5. The ionic radii of N3-, O2-, F- and Na+ follows the order
8. Limestone is a raw material used by which industry?