The main constituents of pearls are
A). Calcium Oxide and Ammonium Chloride
B). Calcium Carbonate and Magnesium Carbonate
C). Aragonite and Conchiolin
D). Ammonium Sulphate and Sodium Carbonate
Calcium Carbonate and Magnesium Carbonate
Calcium Carbonate and Magnesium Carbonate.
1. Pipelines in cold countries often burst in winter because
3. The gas used for artificial fruit ripening of green fruit is
4. Which of the following alloy is used In making magnet ?
5. Lungs have a large number of alveoli for
6. The charcoal used to decolourise brown sugar solution is
7. A microscope used in pathological laboratories forms
8. The substance which conducts current in the solid state is