4. The valency of magnesium is 2. Give the
valency of the other ion in the following
compounds
i. Mgo
ii. Mg3N2
iii. MgCl
iv. MgCO3
v. Mg(NO3)
vi.Mg(OH)2
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Explanation:
Perimter=sum of all lengths of sides of triangle
⇒ Perimeter =3a {a= side of triangle }
⇒45=3a
⇒a=15cm.
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