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D and F Block Elements question

2023 · 6 Apr · Shift 2 · Q2
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D and F Block Elements question

2023 · 6 Apr · Shift 2 · Q2

JEE MainChemistryD and F Block ElementsMCQ+4 / −1
Element not present in Nessler's reagent is :
  1. A
    I
  2. B
    N\mathrm{N}N
  3. C
    K\mathrm{K}K
  4. D
    Hg\mathrm{Hg}Hg
View written solutionFree

Correct answer: B

  1. Recall the composition of Nessler's reagent

    Nessler's reagent is an alkaline solution of potassium tetraiodomercurate(II).

    Its formula is commonly written as: K2[HgI4]\mathrm{K_2[HgI_4]}K2​[HgI4​] in the presence of excess KOH\mathrm{KOH}KOH.

  2. Identify the elements present

    From K2[HgI4]\mathrm{K_2[HgI_4]}K2​[HgI4​] and KOH\mathrm{KOH}KOH, the elements present are:

    • K\mathrm{K}K (potassium)
    • Hg\mathrm{Hg}Hg (mercury)
    • I\mathrm{I}I (iodine)
    • O\mathrm{O}O (oxygen)
    • H\mathrm{H}H (hydrogen)

  3. Check the given options

    • A: I\mathrm{I}I → present
    • B: N\mathrm{N}N → not present
    • C: K\mathrm{K}K → present
    • D: Hg\mathrm{Hg}Hg → present

  4. Conclusion

    The element not present in Nessler's reagent is: N\boxed{\mathrm{N}}N​

So, the correct option is B.

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