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Q.

The density of a pure liquid (mol wt. 70) is 1.2 gm/ml. If 2 ml of liquid contain 35 drops, then the number of molecules in 2 ml of liquid is :

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a

135×NA

b

1.235×NA

c

1.2 NA

d

1.2(35)2×NA

answer is C.

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Detailed Solution

Given, 35 drops = 2 mL

=1.2×270×NA

=1.235×NA

Thus, the number of molecules in 2 ml of liquid is :1.235×NA

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