The answer would be the option number 2. As it would increase the concentration of the solution. So this way the vapour pressure would decrease.
So if you add 0.2 M solution of AgNO3 to 0.1 M AgNO3 then the vapour pressure would decrease.
Hope this helps! All the Best!!
Question : The molecular mass of a gas is:
Option 1: twice its vapour pressure
Option 2: equal to its vapour pressure
Option 3: half its vapour pressure
Option 4: not related to its vapour pressure
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