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Electrolysis — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryElectrolysis1 Mark
MCQ
When fused lead bromide is electrolysed we observe:
  • A
    A silver-grey deposit at the anode and a reddish-brown deposit at the cathode
  • B
    A silver-grey deposit at the cathode and a reddish-brown deposit at the anode
  • C
    A silver-grey deposit at the cathode and reddish-brown fumes at the anode
  • D
    Silver grey fumes at the anode and reddish-brown fumes at the cathode
✓

Answer

C. A silver-grey deposit at the cathode and reddish-brown fumes at the anode
Explanation: The lead bromide breaks into lead and bromine. A silver-grey deposit forms at the cathode (negative electrode), and reddish-brown fumes (bromine gas) are produced at the anode (positive electrode).

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