The process of sudden cooling is known as -
1). ?annealing
2). diffusion
3). quenching
4). sedimentation
1. The aqueous solution of potassium chloride is
2. Question 7.37:Which one of the following does not exist?(i) XeOF4 (ii) NeF2(iii) XeF2 (iv) XeF6
3. Alcoholic ( OH) group can be identified by
5. The first metal used by a man was
6. Ethylene is a ________ molecule.
7. Acid rain is caused due to pollution of atmosphere by
9. When there are two electrons in the same orbital, they have:
10. What is the element that is in the highest percentage in the composition of the earth