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MODEL PAPER 5 — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceMODEL PAPER 51 Mark
MCQ
On adding zinc granules to freshly prepared ferrous sulphate solution, a student observes that
Image
  • A
    a dull brown coating is formed
  • ✓
    a greyish black coating is formed
  • C
    coating a white coating is formed
  • D
    no coating is formed
✓

Answer

Correct option: B.
a greyish black coating is formed
(b) a greyish black coating is formed
Explanation: The colour of the coating is grayish black. When Zinc Reacts with ferrous sulphate zinc displaces iron forming zinc sulphate and iron metal is precipitated and settles on the surface of zinc granules. This is because zinc is more electropositive than iron so it can displace iron from its solution. Also, the solution turns colourless from light green.
$FeSO _4(a q)+ Zn (s) \rightarrow \underset{\text { Black }}{ ZnSO _4(a q)}+ Fe (s)$

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