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Question

Find the odd one out from the following and explain why?  [5 MARKS]

  1. H, N, P, Na
  2. C, He, O, N
  3. C, N, O, Cl
  4. Cs, Cl, Ca, Cd
  5. Cl, Br, I, Ca


Solution

Each point: 1 Mark

The odd one is
1. Na as it is the only metal among them.
2. He as it is the only nobel gas among them.
3. Cl belongs to different period among them.
​4. Cl as it is the only non metal among them.
5. Ca is the only metal in the halogen group.

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