1.

`6.02xx10^(20)` molecules of urea are present in `100 mL` solution. The concentration of urea solution is:A. (a)`0.01 M`B. (b)`0.001 M`C. (c )`0.1 M`D. (d)`0.02 M`

Answer» Correct Answer - a
`6.02xx10^(23)` molecules is 1 mole
`6.02xx10^(20)` molecules is `10^(-3)` mole
`100 mL` has `10^(-3)` mole
`1000 mL` has `(10^(-3))/100xx1000=10^(-2)`


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