Science Questions Bank.........on Solution

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Solution.....

Questions:-
Ques 1:- Pressure cooker reduces the cooking time ,because..?
Ans.Boiling point of water inside is evaluated.

Ques 2:- When a non volatile solute is dissolved in a solvent, the relative lowering of vapour pressure is equal to...?
Ans. Molar fraction of solute

Ques 3::- the number of moles of solute per kg of a solvent is called...?
Ans. Molality.

Ques 4::- The atmospheric pressure of 6% of solution of urea at 0⁰C will be..?
Ans. 22.41 atm pressure.
How can we calculate this:-PV=ST or P=ST/V
Molecular weight of urea is 60
therefore 6 gm urea is present in 100 ml
because 60 gm urea is present in 100*60/6=1000ml or 1 litre
Hence V=1 litre,S=0.0821 lit atmospheric
T=273 k
P=ST/V=0.0821*273/1=22.4 atm

Ques 5:- On dissolving 1.0 gm of a compound in benene,the boiling point of benzene increases by 0.30⁰C.The molecular weight of compound is (molar elevation constant for benzene is 2.53)..?
Ans. 168.6
m=100*k_p*W/delta T*W
=100*2.53*1.0/0.30*50
=168.6