Element not present in Nessler’s reagent is

Question

Statement-I : Consider the following pairs of ions $(\text{Sc}^{3+}, \text{Ti}^{3+}), (\text{Ti}^{4+}, \text{Ni}^{2+}), (\text{Cu}^{2+}, \text{Zn}^{2+})$ and $(\text{Cr}^{3+}, \text{Mn}^{3+})$. Out of these pairs three pairs consist of ions that are both coloured :
Statement-II : Among the lanthanide ions $\text{Eu}^{2+}$, $\text{Gd}^{3+}$, $\text{Ce}^{4+}$ and $\text{Tb}^{4+}$, the ion $\text{Tb}^{4+}$ is the strongest reducing agent.
Choose the correct option.

Answer 1

Nessler's reagent is an important chemical solution used in the qualitative analysis for the presence of ammonia or ammonium ions. This reagent is primarily composed of the following components:

Potassium iodide (KI): The source of potassium ions (K⁺) and iodide ions (I^-).
Mercuric iodide (HgI₂): Provides the mercury (Hg) component essential for the chemical reaction with ammonia.
Sodium hydroxide (NaOH): Provides the alkaline medium required for the reaction to occur.

Let's examine each of the given options:

K (Potassium): Present in Nessler's reagent as potassium iodide (KI).
Hg (Mercury): Present as part of the mercuric iodide (HgI₂).
N (Nitrogen): Not present in Nessler's reagent. The reaction involves ammonia (NH₃), which contains nitrogen, but nitrogen itself is not part of the reagent’s composition.
I (Iodine): Present in both potassium iodide (KI) and mercuric iodide (HgI₂).

Thus, the element that is not part of Nessler's reagent is Nitrogen (N).

Answer 2

Nessler's reagent is an important chemical solution used in the qualitative analysis for the presence of ammonia or ammonium ions. This reagent is primarily composed of the following components:

Potassium iodide (KI): The source of potassium ions (K⁺) and iodide ions (I^-).
Mercuric iodide (HgI₂): Provides the mercury (Hg) component essential for the chemical reaction with ammonia.
Sodium hydroxide (NaOH): Provides the alkaline medium required for the reaction to occur.

Let's examine each of the given options:

K (Potassium): Present in Nessler's reagent as potassium iodide (KI).
Hg (Mercury): Present as part of the mercuric iodide (HgI₂).
N (Nitrogen): Not present in Nessler's reagent. The reaction involves ammonia (NH₃), which contains nitrogen, but nitrogen itself is not part of the reagent’s composition.
I (Iodine): Present in both potassium iodide (KI) and mercuric iodide (HgI₂).

Thus, the element that is not part of Nessler's reagent is Nitrogen (N).

Element not present in Nessler’s reagent is

The Correct Option is C

Solution and Explanation

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