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The valency of phosphorus in H3 PO4 is:
(1) 2
(2) 5
(3) 4
(4) 1
Ans: 5
molecular weight of orthophosphoric acid is M.Its equivalent weight
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Silver has a density of 10.5gcm -3 . The no. of silver atoms on a surface area of 10-12m 2 can be expressed in scientific notation aas y x 10x.The value of x is ..? Ans) d = m
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