NEET · Chemistry · STD 11 - 1. Some basic concept of chemistry
Among the following choose the ones with equal number of atoms.
A. 212 g of \(\text{Na} _2 \text{CO} _3(\text{s})\) [molar mass \(=106 \text{g}\) ]
B. 248 g of \(\text{Na} _2 \text{O} (\text{s})\) [molar mass \(=62 \text{g}\) ]
C. 240 g of \(\text{NaOH} (\text{s})\) [molar mass \(=40 \text{g}\) ]
D. 12 g of \(\text{H} _2(\text{g})\) [molar mass \(=2 \text{g}\) ]
E. 220 q of \(\text{CO} _2(\text{q})\) [molar mass \(=44 \text{g}\) ]
Choose the correct answer from the options given below:
- A A, B and C only
- B A, B and D only
- C B, C and D only
- D B, D and E only
Answer & Solution
Correct Answer
(B) A, B and D only
Step-by-step Solution
Detailed explanation
No. of atoms \(=\) Atomicity \(\times\) mole \(\times N _{ A }\)
(A) No. of atoms \(=6 \times \frac{212}{106} \times N _{ A }=12 N_{ A }\)
(B) No. of atoms \(=3 \times \frac{248}{62} \times N _{ A }=12 N_{ A }\)
(C) No. of atoms \(=3 \times \frac{240}{40} \times N _{ A }=18 N_{ A }\)
(D) No. of atoms \(=2 \times \frac{12}{2} \times N _{ A }=12 N_{ A }\)
(E) No. of atoms \(=3 \times \frac{220}{44} \times N_A=15 N_A\)
(A) No. of atoms \(=6 \times \frac{212}{106} \times N _{ A }=12 N_{ A }\)
(B) No. of atoms \(=3 \times \frac{248}{62} \times N _{ A }=12 N_{ A }\)
(C) No. of atoms \(=3 \times \frac{240}{40} \times N _{ A }=18 N_{ A }\)
(D) No. of atoms \(=2 \times \frac{12}{2} \times N _{ A }=12 N_{ A }\)
(E) No. of atoms \(=3 \times \frac{220}{44} \times N_A=15 N_A\)
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