Question

please answer this question​

Answer 1

Answer:

(1) sulphate- SO₄²-

(2) Aluminium- Al

(3) HCO3 ☑️

Formula by cross method-

1. Cupric oxide-

Cuprous is copper +1 cation (Cu+1)

whereas cupric is copper +2 cation (Cu+2)

So, here valency of copper=2

Valency of oxide (O 2-)= 2

By applying crisscross method:

The formula will be CuO. ☑️

2. Magnesium oxide- Mgo ☑️

3. Hydrogen sulphide- H2S☑️

Thanks! ✌☺️

Answer 2

Answer:

v...

1.sulphite

symbol;

SO3

valency;2

2.aluminium

symbol; A1

VALENCY;3

3.BICARBONATE

SYMBOL;HCO3

VALENCY;1