Question

In qualitative analysis, in III group NH₄Cl is added before
NH₄OH because
(a) to increase the concentration of NH₄⁺ ions
(b) to increase concentration of Cl⁻ ions
(c) to reduce the concentration of OH⁻ ions
(d) to increase concentration of OH⁻ ions

Answer 1

In III group NH₄Cl is added before  NH₄OH because to increase the concentration of NH₄⁺ ions.

Option (A) is correct.

Explanation:

• Iron is a rusty metal and has atomic number 26 and atomic mass is 55.84 amu.
• It belongs to the first transition series.
• The element Iron belongs to 3rd group of the perioic table.
• The hydroxides of iron have low solubility product.
• Therefore, ammonium chloride (NH4Cl) is added before adding NH4OH due to common ion effect so that only 3rd  group cations are precipitated.

Thus in III group NH₄Cl is added before  NH₄OH because to increase the concentration of NH₄⁺ ions.

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