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All the elements in a group (family) have a common valency. For example, all the elements of the carbon family (carbon, silicon, germanium, tin and lead) have common valency four. However, some of these elements can also have valency two. Which of the following can have valency two?

Options

  1. ASilicon, germanium and tin
  2. BOnly germanium and tin
  3. CGermanium, tin and lead
  4. DOnly tin and lead

Correct answer

D. Only tin and lead

Step-by-step solution

The correct answer is option D

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