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 : -
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