The most abundant constituent of atmospheric air is
1). carbon
2). hydrogen
3). oxygen
4). nitrogen
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1. The noble gas used in radiotherapy is
2. When a spoon is to be electroplated with nickel the spoon is
3. What is used in storage batteries?
4. Pentlandite is an ore/mineral of _______.
5. Vulcanization of rubber is carried out by adding
6. Major portion of the earth’s crust is mainly constituted by
7. Question 14.20:Why are vitamin A and vitamin C essential to us? Give their important sources.