1.

`5.85 g NaCI` is dissolved in 1 litre water. The total number of ions of `Na^(+)` and `CI^(-)` in 1 mL of this solution will be :A. `6.02xx10^(19)`B. `1.2xx10^(22)`C. `1.2xx10^(20)`D. `6.02xx10^(20)`

Answer» Correct Answer - C
`5.85 g NaCI` is dissolved in …………
Number of moles of NaCI = Mass/Molar Mass
`= 5.85//58.5`
`= 0.1 mol`
Number of ions `(Na^(+)+Cr)` in 1 L
`= 2xx0.1xx6.02xx10^(23)`
`= 12.04xx10^(22)`
Number of ions in 1 mL `= 12.04xx10^(22)//1000`
`1.2xx10^(20)`


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