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4. d and f- block elements — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistry4. d and f- block elements1 Mark
MCQ
Solder is an alloy of
  • A
    $70\%$  lead, $ 30\%$  tin
  • ✓
    $30\%$  lead, $70\%$  tin
  • C
    $80\%$  lead, $20\%$  tin
  • D
    $90\%$  $Cu, 10\%$  tin
✓

Answer

Correct option: B.
$30\%$  lead, $70\%$  tin
b
(b)Solder -$Sn$  $67\%$  and $ Pb$  $33\%.$

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