Question

Give the formula of : Formula Valency
(1) Oxalate __________ __________
(2) Chromate __________ __________
(3) Phosphide __________ __________

Answer 1

Answer:

1st = u gains of oxygen

2nd = u loss of oxygen

3rd= u gain of h²o

Answer 2

Formula & Valency

Explanation:

(i) Oxalate is a naturally occurring molecule found in abundance in plants and humans. Oxalate is the dianion.

Formula: C2O4 (2−)

Valency: 2

Example: Sodium oxalate (Na2C2O4)

(ii) Chromate salts contain the chromate anion, CrO 2− 4. It bonds by gaining 2 electron.

Formula: CrO4 (2−)

Valency: 2

Example: Sodium Chromate (Na2CrO4)

(iii) Phosphide is an ion. It is a reducing agent. Phosphides of almost every metal in the periodic table are known.

Formula: P (3-)

Valency: 3

Example: Aluminium Phosphide (AlP)