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Which of the following contains the maximum number of atoms ?

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10g of $C a C O_{3}$

4g of hydrogen

9g of $N H_{4} N O_{3}$

1.8g of $C_{6} H_{12} O_{6}$

answer is B.

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Detailed Solution

1) 100gms $C a C O_{3} - 5 N a t o m s$

$10 g m s C a C O_{3} - \frac{10 \times 5 N}{100}$

$\frac{N}{2} a t o m s$

$2) 2 g m s H_{2} - 2 N a t o m s$

$4 g m s H_{2} - \frac{4 \times 2 N}{2}$

= 4N atoms

3) 80 gms $N H_{4} N O_{3} - 9 N a t o m s$

9 gms $N H_{4} N O_{3} - \frac{9 \times 9 N}{80} a t o m s$

1.01N atoms

4) 180gms $C_{6} H_{12} O_{6} - 24 N a t o m s$

$1.8 g m s C_{6} H_{12} O_{6} - \frac{24 N \times 1.8}{180}$

0.24N atoms

$∴$ 4 gms of $H_{2}$ contains maximum number of atoms.

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