CBSE
Multiple Choice QuestionsWhich of the following changes with change in temperature ?
Mole fraction
Formality
% (w/W)
Molality
Which ofthe following sequence contains atomic number of only representative elements?
55,12,48,53
13,33,54,80
3,33,53,87
22,33,55,66.
Ksp of CaSO4.5H2O is 9 10-6, find the volume for 1 g of CaSO4 (M.wt. = 136).
2.45 litres
5.1 litres
4.52 litres
3.2 litres
Molarity of a given orthophosphoric acid solution is 3 M .It's normality is :
9 N
0.3 N
3 N
1 N
100 cm3 of a given sample of H2O2 gives 1000 cm3 of O2 at S.T.P. The given sample is
10% H2O2
90% H2O2
10 volume H2O2
100 volume H2O2
How many grams of CO2 will be produced by the complete combustion of 2 moles of ethanol ?
132 g
44 g
176 g
88 g
Equal weight of CO and CH4 are mixed together in an empty container at 300 K. The fraction of total pressure exerted by CH4 is.
An organic substance containing carbon , hydrogen and oxygen gave the following percentage composition .
C = 40.687 % , H = 5.085% and O = 54.228 %
What is the empirical formula of the compound ?
CH3O
C2H2O
CH4O
C2H3O2
A solution contains 25% H2O , 25% C2H5OH and 50% CH3COOH by mass .The mole fraction of H2O would be :
0.25
2.5
0.502
5.03
The molarity of a 0.2 N Na2CO5 solution will be :
0.05 M
0.2 M
0.4 M
0.1 M
