Question

1. Write two examples of each : (5)
a. Monovalent cation
b. Divalent polyatomic anion
c. Tetra atomic molecule of compound
d. Diatomic molecule of element
e. Monovalent polyatomic anion
2. Write chemical formula of the following compounds and also find atomicity of each compound (5)
a. Zinc hydroxide
b. Magnesium bicarbonate
c. Sodium carbonate
d. Aluminium nitrate
e. Lithium nitride.
3. Find the molecular mass of the following:(5)
a. Ammonium phosphide
b. Calcium chloride
c. Potassium nitrate
d. Ferric oxide
e. Cuprous oxide.
N = 14u, H = 1u, P= 31u, Ca= 40u, Cl = 35.5u,
K= 39u, O= 16u, Fe= 56u, Cu= 63u

Answer 1

Answer:

For example, Na+ is a monovalent cation, Cl- is a monovalent anion, Ca2+ is a divalent cation, SO42- is a divalent anion, Fe3+ is a trivalent cation, and PO43- is a trivalent anion. Ions of larger valency also exist