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How many atoms are present in a (a) H2S molecule and (b) PO43– ion ?
(a) H2S molecule consists of 2 hydrogen atoms and one sulphate atom.
∴ 3 atoms are present in H2S.
(b) PO43- ion consists of one atom of phosphorus and four atoms of oxygen.
∴ Five atoms are present in PO43-
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