JEE Mains · Chemistry · STD 11 - 1. Some basic concept of chemistry
\(15\, mL\) of aqueous solution of \(Fe ^{2+}\) in acidic medium completely reacted with \(20\, mL\) of \(0.03\, M\) aqueous \(Cr _{2} O _{7}^{2-}\) The molarity of the \(Fe ^{2+}\) solution is ........... \(\times 10^{-2} M\) (Round off to the Nearest Integer).
- A \(32\)
- B \(20\)
- C \(24\)
- D \(42\)
Answer & Solution
Correct Answer
(C) \(24\)
Step-by-step Solution
Detailed explanation
\(n _{ eq } Fe ^{2+}= n _{ eq } Cr _{2} O _{7}^{2-}\) or, \(\left(\frac{15 \times M _{ Fe ^{2+}}}{1000}\right) \times 1=\left(\frac{20 \times 0.03}{1000}\right) \times 6\) \(\therefore M _{ Fe ^{2+}}=0.24 M =24 \times 10^{-2} M\)
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