Among the following, choose the ones with equal number of atoms. A. 212 g of Na_2 CO_3(~s) [molar mass =106 ~g ] B. 248 g of Na_2 O(s) [molar mass =62 ~g ] C. 240 g of NaOH(s) [molar mass =40 ~g ] D. 12 g of H_2(~g) [molar mass =2 ~g ] E. 220 g of CO_2(~g) [molar mass =44 ~g ] Choose the correct answer from the options given below:

Some Basic Concepts of Chemistry PYQ — NEET 2025 · Q116 with Solution

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Correct answer: D

Number of atoms $=\frac{\text { given mass }}{\text { molar mass }} \times$ atomicity $\times \mathrm{N}_{\mathrm{A}}$

A. $\frac{212}{106} \times 6 \times \mathrm{N}_{\mathrm{A}}=12 \mathrm{~N}_{\mathrm{A}}$

B. $\frac{248}{62} \times 3 \times \mathrm{N}_{\mathrm{A}}=12 \mathrm{~N}_{\mathrm{A}}$

C. $\frac{240}{40} \times 3 \times \mathrm{N}_{\mathrm{A}}=18 \mathrm{~N}_{\mathrm{A}}$

D. $\frac{12}{2} \times \mathrm{N}_{\mathrm{A}} \times 2=12 \mathrm{~N}_{\mathrm{A}}$

E. $\frac{220}{44} \times \mathrm{N}_{\mathrm{A}} \times 3=15 \mathrm{~N}_{\mathrm{A}}$

A, B and D have same number of atoms