1 ) At constant pressure , if temperature of
monatomic ideal gas is doubled , then average speed of an atom : -
A ) increase 2 times , B ) increase √2 times ,
C ) increase √(2/3) times , D ) None of these ,
Correct
Answer : - B ) increase √2 times ,
Solution
: -
Formula
: -
For average speed of gas particles : -
v = √(3RT/M) .
T = temperature , M = molecular mass , R = gas constant =
8.314 J/(mole.k)
If Tʹ = 2T ,
So velocity will be : -
vʹ = √(3RTʹ/M) .
vʹ = √{3R(2T)/M} .
vʹ = √2*(3RT/M) .
vʹ =
√2 * v .
Answer .
So
velocity will be increased by under root two times .
2 )
Density of water is ………….. than ice .
A ) greater , B
) smaller ,
C ) same , D
) None of these ,
Correct
Answer : - A ) greater ,
3 )
What is molecular formula for a compound , whose molecular mass is 26 and
empirical formula is CH ?
A ) CH2 , B
) C2H2 ,
C ) C2H , D
) None of these ,
Correct
Answer : - B ) C2H2 ,
Solution
: -
Formula
: -
Oxidation no. = molecular mass / empirical mass ,
molecular mass =
26 , empirical mass = 12 + 1 = 13 .
So ,
Oxidation no. = 26 / 13
= 2 ,
So ,
molecular formula : - C2H2 .
4 )
Chloroform molecules links together by ……… ,
A ) dipole – dipole forces , B ) hydrogen
bonding ,
C ) London dispersion , D ) None of these ,
Correct
Answer : - A ) dipole – dipole forces ,
5 )
AgCl does not readily dissociate in water to form ions .
6 )
Formula for nitrous oxide : -
A ) N2O , B
) N2O3 ,
C ) NO2 , D
) NO3,,
Correct
Answer : - A ) N2O ,
7 )
Paramagnetic nature of O2 is explained by ……… ,
A ) VSEPR , B
) molecular orbital theory ,
C ) VBT , D
) None of these ,
Correct Answer : - B ) molecular orbital theory ,
Now go to online quiz section and Chemistry Quiz 3 is uploaded related to these mcqs , so check your preparation by this link : -
