MCQ practice · SSC Chemistry Board questions · Chapter 5: Chemical Bond
Which of these elements shows variable valency?
Think it through first, then pick an option.
- a O
- b Fe
- c Al
- d Mg
Answer and explanation
Correct answer: b Fe
Fe has valencies 2 and 3 (FeCl₂, FeCl₃), so it is variable.
Why the other options are wrong
- a O: O has only valency 2 (H₂O); Fe has the variable valencies 2 and 3.
- c Al: Al has only valency 3 (AlCl₃); Fe has 2 and 3.
- d Mg: Mg has only valency 2 (MgCl₂); Fe is the one with variable valency.
More board questions on this topic
- What is the latent valency of S in the compound H₂S?
- The gas 'X' formed:
- What is the latent valency of Fe in FeCl₃?
- Which shows variable valency?
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