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 $



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