Advertisements
Advertisements
Question
Match the symbols of – radicals – with their correct combining power or capacity, (valency).
(a) OH
(b) So4
(c) No3
(d) Co3
Combining power or capacity – A : 3; B : 2; C : 1. (negative valencies)
Solution
(a) OH — Valency- 1 (C)
(b) So4 — Valency- 2 (B)
(c) No3 — Valency- 1 (C)
(d) Co3 — Valency- 2 (B)
RELATED QUESTIONS
Write the names and symbols of the first twenty elements that you have studied in class VI & VII.
Select elements and compounds from the following list: Iron, plaster of paris, chalk, common salt, copper, aluminium, calcium oxide, cane sugar, carbon, silica, sodium sulphate, uranium, potassium carbonate, silver, carbon dioxide.
Give two examples of the following :
Solid + Solid mixture
Match the symbols of non-metallic elements with their correct combining power or capacity.
(a) O
(b) S
(c) Cl
Combining power or capacity A : 3; B : 2; C : 1. (negative valencies)
State the type of element for the following:
Arsenic
Give the symbol of the following element:
Nitrate
Define the term ‘valency’.
State whether the following ion or radical given below of a non-metallic element exhibits valency: 1–, 2– or 3–. (write the ion or radical with the correct valency).
Zincate
State whether the following ion or radical given below of a non-metallic element exhibits valency: 1–, 2– or 3–. (write the ion or radical with the correct valency).
Phosphate
Write the symbols for the following elements.
- Oxygen
- Gold
- Calcium
- Cadmium
- Iron
