Some Basic Concepts Of Chemistry Question 155

Question: About $ 6\times {10^{-3}} $ mol $ K _2Cr _2O _7 $ reacts completely with $ 9\times {10^{-3}} $ mol $ {X^{n+}} $ to give $ X{O^{-}}_3 $ and $ C{r^{3+}} $ . The value of $ n $ is:

Options:

A) 1

B) 2

C) 3

D) none of these

Show Answer

Answer:

Correct Answer: A

Solution:

[a] $ K _2Cr _2O _7+{X^{n+}}\to {X^{5+}}O_3^{-}+C{r^{3+}} $ $ 6\times {10^{-3}}\times 6=(5-n)\times 9\times {10^{-3}}\Rightarrow ,n=1 $



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