Multiple choice

Among the following -------------------------- has a variable molecular formula.

  1. ammonium formate

  2. ammonium chromate

  3. ammonium chlorate

  4. ammonium ferric citrate
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Ammonium ferric citrate is a food additive used as an acidity regulator. It is a green or reddish-brown powder which is very soluble in water. The molecular formula of ammonium iron(III) citrate is variable. It can be prepared by adding Fe(OH)2 to an aqueous solution of citric acid and ammonia.

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