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D and F Block Elements question

2021 · 17 Mar · Shift 2 · Q12
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D and F Block Elements question

2021 · 17 Mar · Shift 2 · Q12

JEE MainChemistryD and F Block ElementsMCQ+4 / −1
The common positive oxidation states for an element with atomic number 24, are :
  1. A
    +1 and +3
  2. B
    +2 to +6
  3. C
    +1 to +6
  4. D
    +1 and +3 to +6
View written solutionFree

Correct answer: B

  1. Identify the element with atomic number 24

    Atomic number 242424 corresponds to chromium (Cr\mathrm{Cr}Cr).

  2. Write its electronic configuration

    Chromium has the electronic configuration: Cr:[Ar] 3d54s1\mathrm{Cr}: [\mathrm{Ar}]\,3d^5 4s^1Cr:[Ar]3d54s1

    Because both the 4s4s4s electron and the 3d3d3d electrons can participate in bonding, chromium shows several oxidation states.

  3. Determine its common positive oxidation states

    Chromium commonly exhibits the oxidation states: +2, +3, +4, +5, +6+2,\ +3,\ +4,\ +5,\ +6+2, +3, +4, +5, +6

    Among these, the most common are +2+2+2, +3+3+3, and +6+6+6, but in general the common range is taken as: +2 to +6+2 \text{ to } +6+2 to +6

    Chromium does not commonly show the +1+1+1 oxidation state.

  4. Check the options

    • A: +1+1+1 and +3+3+3 ❌
      Incorrect, because +1+1+1 is not a common oxidation state of chromium.

    • B: +2+2+2 to +6+6+6 ✅
      Correct. This matches the common oxidation states of chromium.

    • C: +1+1+1 to +6+6+6 ❌
      Incorrect, because +1+1+1 is not commonly shown.

    • D: +1+1+1 and +3+3+3 to +6+6+6 ❌
      Incorrect, again due to inclusion of +1+1+1.

  5. Final answer

    The correct option is: B: +2 to +6\boxed{\text{B: } +2 \text{ to } +6}B: +2 to +6​

  6. Comparison with stored correct answer

    Stored correct answer: B
    Derived answer: B

    Hence, the derived answer agrees with the stored correct answer.

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