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Chemistry
Which one of the following statements is correct ?
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Q. Which one of the following statements is correct ?
BITSAT
BITSAT 2010
A
From a mixed precipitate of $AgCl$ and $Agl$, ammonia solution dissolves only $AgCl$.
0%
B
Ferric ions give a deep green precipitate on adding potassium ferrocyanide solution.
100%
C
On boiling a solution having $K^+, Ca^{2+}$ and $HCO_3^-$ ions we get a precipitate of $K_2Ca(CO_3)_2$.
0%
D
Manganese salts give a violet borax bead test in the reducing flame.
0%
Solution:
Ammonia can dissolve ppt. of $AgCl$ only due to formation of complex as given below:
$AgCl +2 NH _{3} \rightarrow\left[ Ag \left( NH _{3}\right)_{2}\right] Cl$