Multiple Choice Question Answer VII — task. Science CBSE, Class 9.

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1. The average atomic mass of an element Q is 35.5 u. What are the percentages of isotopes \(_{17}^{35}\textrm{Q}\) and 17/37 Q in the sample?

75%, 25%
70%, 30%
85%, 25%
80%, 20%

2. Which of the following statements is true?

Mass of 0.5 mole of \(N_2\) gas < Mass of 0.5 mole of N atoms
Mass of 0.5 mole of \(N_2\) gas = Mass f 0.5 mole of \(O_2\) gas
Mass of 0.5 mole of \(N_2\) gas > Mass of 0.5 mole of N atoms
Mass of 0.5 mole of \(N_2\) gas = Mass of 0.5 mole of N atoms

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