A. CaPO4
B. CaCO3
C. CaSO4
D. SiO2
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- Plaster of Paris is
- In wet process (strong sulphuric acid leaching for the manufacture of orthophosphoric acid a by-product obtained is
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- Humming bird is an example of________________??
- Which one of the following forms the blk of exoskeleton of an arthropod??
- Which of the following statement about an arthropod exoskeleton is incorrect??
- The relationship between the alga Cladophora and the snail shell on which it grows corresponds to:?
- Most of the marine invertebrates are__________??
- Refractometer works on the principle of________________?
- The most important group of producers in marine ecosystem is of__________??
