(A) Hydrated cobalt$(II)$ salts,such as $CoCl_2 \cdot 6H_2O$,are pink in colour due to the presence of the $[Co(H_2O)_6]^{2+}$ complex. Upon heating,t

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(A) Hydrated cobalt$(II)$ salts,such as $CoCl_2 \cdot 6H_2O$,are pink in colour due to the presence of the $[Co(H_2O)_6]^{2+}$ complex. Upon heating,the water of crystallization is lost,and the salt converts to anhydrous cobalt$(II)$ chloride $(CoCl_2)$,which is blue in colour. Therefore,the presence of the $Co^{2+}$ cation is most likely.

Class 12 Chemistry Principles Related to Practical Chemistry Wet Test for Basic Radical

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$A$ pink coloured salt turns blue on heating. The presence of which cation is most likely?

JEE MAIN 2015 All JEE MAIN

A
$Co^{2+}$
B
$Cu^{2+}$
C
$Zn^{2+}$
D
$Fe^{2+}$

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Wet Test for Basic Radical

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$A$ pink coloured salt turns blue on heating. The presence of which cation is most likely?

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Assign $A$,$B$,$C$,$D$ from the given type of reaction.$AlCl_3 + Na_3PO_4 \longrightarrow AlPO_4 \downarrow$

On passing $H_2S$ gas,a black precipitate of $II$ group is obtained. The mixture may not contain:

The cation that will not be precipitated by $H_2S$ in the presence of $dil. \ HCl$ is

When calomel reacts with $NH_4OH$,we get

Of the following sulphides,which one is insoluble in dilute acids but soluble in alkalies?

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Assign $A$,$B$,$C$,$D$ from the given type of reaction.
$AlCl_3 + Na_3PO_4 \longrightarrow AlPO_4 \downarrow$