Which of the following is correctly arranged in order of increasing...

Which of the following is correctly arranged in order of increasing weight?

Options

A0.0105 equivalent of $\mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4 \cdot 2 \mathrm{H}_2 \mathrm{O} \lt 0.625 \mathrm{~g}$ of $\mathrm{Fe} \lt 0.006 \mathrm{~g}$ atom of $\mathrm{Ag} \lt 6.0 \times 10^{21}$ atoms of Zn
B0.625 g of $\mathrm{Fe} \lt 0.0105$ equivalent of $\mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4 \cdot 2 \mathrm{H}_2 \mathrm{O} \lt 6.0 \times 10^{21}$ atoms of $\mathrm{Zn} \lt$ 0.006 g atom of Ag
C0.625 g of $\mathrm{Fe} \lt 6.0 \times 10^{21}$ atoms of $\mathrm{Zn} \lt 0.006 \mathrm{~g}$ atom of $\mathrm{Ag} \lt 0.0105$ equivalent of $\mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4 \cdot 2 \mathrm{H}_2 \mathrm{O}$
D0.0105 equivalent of $\mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4 \cdot 2 \mathrm{H}_2 \mathrm{O} \lt 0.006 \mathrm{~g}$ atom of $\mathrm{Ag} \lt 6.0 \times 10^{21}$ atoms of $\mathrm{Zn} \lt 0.625 \mathrm{~g}$ of Fe

Correct answer

C. 0.625 g of $\mathrm{Fe} \lt 6.0 \times 10^{21}$ atoms of $\mathrm{Zn} \lt 0.006 \mathrm{~g}$ atom of $\mathrm{Ag} \lt 0.0105$ equivalent of $\mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4 \cdot 2 \mathrm{H}_2 \mathrm{O}$

Step-by-step solution

\begin{aligned} & 0.625 \mathrm{ g} \mathrm{Fe} \\ & 0.0105 \text{ eq. of } \mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4 \cdot 2 \mathrm{H}_2 \mathrm{O}=0.0105 \times 63 \\ & \quad=0.66 \mathrm{ g} \quad(\text{ Eq. wt }=63) \\ & 6 \times 10^{21} \text{ atoms of } \mathrm{Zn}=\frac{6 \times 10^{21}}{6.023 \times 10^{23}} \times 65=0.647 \mathrm{ g}\end{aligned}

0.006 g atom of \mathrm{Ag}=0.006 \times 108=0.648 \mathrm{ g} \therefore

Increasing order of weight

\mathrm{Fe}

<

\mathrm{Zn}

<

\mathrm{Ag}

<

\mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4 \cdot 2 \mathrm{H}_2 \mathrm{O}$

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