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WBCS 2024 · Question 126 of 196

If 14 gm of N2 has 'n' number of molecules, how many molecules are present in 46 gm NO2?

Science - Chemistry

  1. An
  2. B2nCorrect
  3. Cn/2
  4. D3n/2

Answer: B. 2n

Explanation

Official WBPSC key (Series A): (B) 2n. 14 g of N2 = 0.5 mol = n molecules, so 1 mol = 2n. 46 g of NO2 = 1 mol = 2n molecules.

Source: WBCS (Exe) etc. (Prelim) 2024, Series A

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