Section A
Q1.
Which defect does silver chloride show and why? Which isomerism do complexes show and why? Arrange the following metals in descending order of their trans-effect with proper justification: Phenolphthalein shows red colour in presence of dilute alkali. However, if treated with excess of concentrated alcoholic alkali, the red colour first produced disappears. Explain how. Calculate the solubility product of silver chromate at a particular temperature, at which its solubility is 2.5 × 10-2 gram litre-1.
[Given : The relative molecular mass of silver chromate is 331.728] Determine the colour change interval for the indicator, diphenylamine, at 298 K.
[Given : E0 for diphenylamine is + 0.756 V] Why can Eriochrome Black T not be used to indicate the end point of a direct EDTA titration of calcium? Which metals of the following have the greatest tendency to form metal clusters? Justify your answer.
(b) Which isomerism do [(NH3)_5CoONO]Cl2 and [(NH3)_5CoNO_2]Cl2 complexes show and why?
(c)
Arrange the following metals in descending order of their trans-effect with proper justification:
Ni^{II}, Pt^{II}, Pd^{II}
(d) Phenolphthalein shows red colour in presence of dilute alkali. However, if treated with excess of concentrated alcoholic alkali, the red colour first produced disappears. Explain how.
(e)
Calculate the solubility product of silver chromate at a particular temperature, at which its solubility is 2.5 × 10-2 gram litre-1.
[Given : The relative molecular mass of silver chromate is 331.728]
(f)
Determine the colour change interval for the indicator, diphenylamine, at 298 K.
[Given : E0 for diphenylamine is + 0.756 V]
(g) Why can Eriochrome Black T not be used to indicate the end point of a direct EDTA titration of calcium?
(h) Which metals of the following have the greatest tendency to form metal clusters? Justify your answer.
