Element not present in Nessler’s reagent is
- K
- Hg
- N
- I
The Correct Option is C
Approach Solution - 1
The correct option is (C): N
Nessler’s Reagent\(\rightarrow K_2[HgI_4]\)
Approach Solution -2
Nessler's reagent is a chemical reagent used for detecting the presence of ammonia (NH3) or ammonium ions (NH4+) in a solution. It is made by mixing potassium iodide (KI) and mercuric chloride (HgCl2) in a basic solution.
Therefore, the correct answer is (C) N.
Answer. C
Approach Solution -3
Nessler's Reagent Composition
Nessler's reagent is an alkaline solution of potassium tetraiodomercurate(II), \( \text{K}_2[\text{HgI}_4] \). It is prepared by dissolving mercuric iodide (\( \text{HgI}_2 \)) in an aqueous solution of potassium iodide (\( \text{KI} \)) and then adding potassium hydroxide (\( \text{KOH} \)).
The elements present in Nessler's reagent are potassium (K), mercury (Hg), and iodine (I).
Conclusion:
Nitrogen (N) is not part of the chemical formula of Nessler's reagent.
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Concepts Used:
D and F Block Elements
The d-block elements are placed in groups 3-12 and F-block elements with 4f and 5f orbital filled progressively. The general electronic configuration of d block elements and f- block elements are (n-1) d 1-10 ns 1-2 and (n-2) f 1-14 (n-1) d1 ns2 respectively. They are commonly known as transition elements because they exhibit multiple oxidation states because of the d-d transition which is possible by the availability of vacant d orbitals in these elements.
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Read More: The d and f block elements