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3. What are polyatomic ions! Un
4. Write the chemical formulae of the following
(a) Magnesium chloride
(b) Calcium oxide
(c) Copper nitrate
(d) Aluminium chloride
(e) Calcium carbonate.
of the elements present in the follo
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Answer: ions which are formed by group of joined atoms are known as polyatomic ions .
Example-NH4,OH
A,MgCl2
B,CaO
C,Cu(No3)2
D,AlCl3
E,CaCo3
Explanation:
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