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  2. Question
  3. Chemistry
  4. When 10 m L of an aqueous solution of F e2+ ions was titrated in the presence of dil H 2 SO 4 using diphenylamine indicator, 15 mL of 0.02 M solution of K 2 Cr 2 O 7 was required to get the end point. The molarity of the solution containing F e2+ ions is x × 10-2 M. The value of x is .(Nearest integer)

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Q. When $10\, m L$ of an aqueous solution of $F e^{2+}$ ions was titrated in the presence of dil $H _{2} SO _{4}$ using diphenylamine indicator, $15\, mL$ of $0.02\, M$ solution of $K _{2} Cr _{2} O _{7}$ was required to get the end point. The molarity of the solution containing $F e^{2+}$ ions is $x \times 10^{-2} M$. The value of $x$ is __________.(Nearest integer)

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Solution:

milli-equivalents of $F e^{2+}=$ milli-equivalents of $K _{2} Cr _{2} O _{7}$
$M \times 10 \times 1=0.02 \times 15 \times 6$
$M=0.18=18 \times 10^{-2} M$