Some Basic Concepts Of Chemistry Question 265
Question: The ratio of the molar amounts of $ H _2S $ needed to precipitate the metal ions from $ 20mL $ each of $ 1M\ Cd{{(NO _3)}_2} $ and $ 0.5M\ CuSO _4 $ is [CPMT 1997]
Options:
A) 1 : 1
B) 2 : 1
C) 1 : 2
D) Indefinite
Show Answer
Answer:
Correct Answer: B
Solution:
$ C{d^{+2}}\ \ +\ \ \ \ {S^{2-}}\to CdS $
20×1= 20 $ C{u^{+2}}+{S^{2-}}\to CuS $
20×0.5 =10 Ratio = $ 2:1 $
