`Co^(2+) + KCN` (not in excess) `to` precipitate. Select the correct statement(s) with respect to the precipitate.

Question

`Co^(2+) + KCN` (not in excess) `to` precipitate. Select the correct statement(s) with respect to the precipitate.

`Co^(2+) + KCN` (not in excess) `to` precipitate.
Select the correct statement(s) with respect to the precipitate.
A. It is yellow in colour
B. It is reddish-brown in colour
C. It dissolves in excess of the reagent forming a brown solution
D. It is obtained when brown solution (option C) is acidified with dilute `HCl` in the cold.

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - B,C,D
`Co^(2+)+2CN^(-)toCo(CN)_(2)darr`(reddish-brown)
`Co(CN)_(2)darr +4CN^(-)("excess")to [Co(CN)_(6)]^(4-)` (brown solution)
`[Co(CN)_(6)]^(4-)+4H^(+)to Co(CN)_(2)darr +4HCN`

4 views Answered 2023-02-05 15:29