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Due to common ion effect (NH 4 + ions), NH 4 Cl reduces the ionisation of NH 4 OH. Then hydroxides of III group only (but not of those of IV group) are precipitated.

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Equilibrium

Short Answer Type

181.

What is the difference between solubility product and ionic product?

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182. What is the relationship between pK_aand pK_b values where K_a and K_b represent ionisation constants of the acid and its conjugate base respectively?

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183.

What is the relationship between pH and pOH?

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184.

What is the maximum value of the ionic product of a salt at a particular temperature ?

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185.

How does the degree of ionisation of a weak acid change with the increase in concentration ?

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186.

Under what condition a precipitate is formed if two solutions are mixed ?

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187.

What is common ion effect?

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188.

How does the ionisation of H₂S change in the presence of HCl?

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189.
During qualitative analysis, why NH₄Cl and NH₄OH are added in the III group?

Due to common ion effect (NH₄⁺ ions), NH₄Cl reduces the ionisation of NH₄OH. Then hydroxides of III group only (but not of those of IV group) are precipitated.

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