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The atomic numbers of elements A, B, C and D are Z-1, Z, Z+1 and Z+2 , respectively. If ' B ' is a noble gas, choose the correct answers from the following statements (1) ' A ' has higher electron affinity (2) ' C ' exists in +2 oxidation state (3) ' D ' is an alkaline earth metal

Options

  1. A(1) and (2)
  2. B(2) and (3)
  3. C(1) and (3)
  4. D(1),(2) and (3)

Correct answer

C. (1) and (3)

Step-by-step solution

Given, Atomic number of element B=Z ( noble gas belong to zero group) Atomic number of element A=Z-1 (ie, halogens) Atomic number of element C=Z+1 (ie, group IA) Atomic number of element D=Z+2 (ie, group IIA) Element B is a noble gas Element A must be a halogen ie, have highest electron affinity. and element C must be an alkali metal and exist in +1 oxidation state. and element D must be an alkaline earth metal with +2 oxidation state.

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