Question

16. Define compound ion with two examples.
17. Define chemical formula.
Write the chemical formula of the following using criss-cross method.
a) Magnesium chloride
b) Calcium
carbonate
19 Write the formula of the following.
a) Hydrogen sulphide
b) Dichromate ion
20. Define the following
a) Simplest ion
b) Compound ion​

Answer 1

Answer:

Answer

Chemical formula of the following is as follows:

(a) Magnesium chloride = MgCl

2

(b) Calcium oxide = CaO

(c) Copper nitrate = Cu(NO

3

)

2

(d) Aluminium chloride = AlCl

3

(e) Calcium carbonate = CaCO

3

Answer 2

Answer:

nacl with na± and cl- ions ,mgo with mg2+ and O²