JEE Main 2017 Chemistry question
Excess of NaOH (aq) was added to mL of (aq) resulting into g of . The molarity of (aq) is: (Given the molar mass of Fe g mol and molar mass of Cl g mol)
Answer: (2)
Solution
The precipitation reaction is
\mathrm{ + 3NaOH \longrightarrow \downarrow + 3NaCl},
so one mole of gives exactly one mole of . The molar mass of is
56 + 3(16 + 1) = 56 + 51 = 107\ g mol^{-1},
so the moles precipitated are
n = = 0.
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