MCQ practice · SSC Chemistry Board questions · Chapter 7: Chemical Reactions
What colour does the compound 'X' in the stem show?
Think it through first, then pick an option.
- a Blue
- b Red
- c Reddish brown
- d Green
Answer and explanation
Correct answer: c Reddish brown
FeCl₃ + 3NaOH → Fe(OH)₃↓ + 3NaCl: X = Fe(OH)₃, a reddish-brown precipitate.
Why the other options are wrong
- a Blue: Light blue is the colour of Cu(OH)₂. Fe(OH)₃ is not blue.
- b Red: Fe(OH)₃ is not plain red; its colour is reddish brown.
- d Green: Green is the colour of Fe(OH)₂ (from FeSO₄ + NaOH). In FeCl₃ iron is +3, so Fe(OH)₃ forms.
More board questions on this topic
- In the stem-
- Which compound is soluble in water?
- Which is a non-redox reaction?
- Which is a non-redox reaction?
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