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santhosh kumar kumar
's Polls
science
The main constituents of pearls are
calcium oxide and ammonium chloride
1 vote (50%)
calcium oxide and ammonium chloride
calcium carbonate and magnesium carbonate
1 vote (50%)
calcium carbonate and magnesium carbonate
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2 votes
| 106 views
(200 symbols max)
Wolmal
(256 symbols max)
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