Identify the following:
a)A white compound that liberates a reddish brown gas when heated and forms a white precipitate with NH4 OH solution that dissolves in excess of the reagent.
b) A green compound that shows brisk effervescence of a gas when treated with dilute HCI.
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Explanation:
When dilute HCl is added to a salt Q, a brisk effervescence is produced and the gas turns lime water milky.
This indicates presence of carbonate ion.
CO
3
2+
+2HCl→H
2
O+CO
2
↑+2Cl
−
Ca(OH)
2
+CO
2
→CaCO
3
↓+H
2
O
When NH
4
OH solution is added to the above mixture (after adding dilute HCl), it produces a white precipitate which is soluble in excess NH
4
OH solution.
This indicates presence of Zn(II) ions.
Zn
2+
+2NH
4
OH→Zn(OH)
2
↓+2NH
4
+
Zn(OH)
2
+4NH
4
OH(excess)→
(water soluble)
[Zn(NH
3
)
4
](OH)
2
+4H
2
O
Hence, the salt Q is zinc carbonate ZnCO
3
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