1 ) How many moles of helium gas occupy 22.4 L at 0 degree at 1atm pressure ?
A ) 1 mol , B
) 2 mol ,
C ) 3 mol , D
) None of these ,
Correct
Answer : - A ) 1 mol ,
Solution
: -
Formula
: -
Moles = volume / STP
= 22.4 / 22.4 = 1
mol .
2 )
Work is not a state function .
3 ) Each
carbon in benzene is ……… hybridized .
A ) sp1 , B
) sp2 ,
C ) sp3 , D
) None of these ,
Correct
Answer : - B ) sp2 ,
4 )
( Mass spectrometer ) …………… is used to measure the mass of a charge particle .
5 )
Percentage of calcium in calcium carbonate
is ?
A ) 20 % , B
) 40 % ,
C ) 80 % , D
) None of these ,
Correct
Answer : - B ) 40 % ,
Solution
: -
Ca = 40 , C = 12
, O = 16 ,
So ,
Ca/(CaCO3) x 100
= 40/(40+12+48) x 100 = 40/100 x
100 = 40 %
Answer
.
6 )
No. of molecules formula : -
No.
of molecules = ( mass / molar mass ) x NA ,
7 )
Ionic compounds are ………….. in solvent
that contains a common ion .
A ) less soluble , B
) more soluble ,
C ) are un soluble , D ) None of these ,
Correct
Answer : - A ) less soluble ,
8 )
An X grams of calcium carbonate was completely burnt in air . The weight of
solid residue formed is 28 g . What
value of X grams ?
A ) 25 g , B
) 50 g ,
C ) 100 g , D
) None of these ,
Correct
Answer : - B ) 50 g ,
Solution : -
Now go to online quiz section and Chemistry Quiz 3 is uploaded related to these mcqs , so check your preparation by this link : -
