Question

3. What are polyatomic ions
4. Write the chemical formulae of the following.
(a) Magnesium chloride
(b) Calcium oxide
(c) Copper nitrate
(d) Aluminium chloride
(e) Calcium carbonate.
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Answer 1

3.A molecular ion is a covalently bonded set of two or more atoms, or of a metal complex, that can be considered to behave as a single unit and that has a net charge that is not zero. Unlike a molecule, which has a net charge of zero, this chemical species is an ion.

4.a  Cu(NO3)2.

b CaO

c Cu(NO3)2

d AlCl₃

e CaCO3

Answer 2

Answer:

1. A polyatomic ion is a charged ion composed of two or more bounded atoms.

• MnCl2
• CaO
• CuNO3
• AlCl3
• CaCO3

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