1 ) An ideal gas obeying kinetic gas equation . . . . . . . . . . . . . . . liquefied at any value of P and T . A ) can be , B ) cannot be , C ) None of these ,

1 ) An ideal gas obeying kinetic gas equation  . . . . . . . . . . . . . . .  liquefied at any value of P and T . 

A ) can be ,                                             

B ) cannot be ,

C ) None of these ,

Correct Answer : -  B ) cannot be ,

Because ideal gas obeys PV = nRT , so that real gas can be liquefied .

 

2 ) kinetic energy of one mole of an ideal gas at 300K in kj is : -

A ) 2.74 kJ .                                             B ) 3.00 kJ .

C ) 3.74 kJ .                                             D ) None of these ,

Correct Answer : - C ) 3.74 kJ .

Solution : -

formula : -

K.E = ( 3 / 2 ) n R T   =   ( 3 / 2 ) ( 1 ) ( 8.314 ) ( 300 ) .

K.E = 3741.3 J = 3.74 kJ  ,  Answer .

 

3 ) Le - chateliers principle is an observation about changes in  . . . . . . . . . . . . . .  of system .

A ) temperature and pressure ,                       B ) volume ,

C ) concentration ,                           D ) All of these ,

Correct Answer : - D ) All of these ,

 

4 ) In Rutherford scattering experiment , most of the electrons pass through the gold . . . . . . . . . . . . . . .  ( un – deflected )  and proved that atom is mostly empty .

 

5 )  Find the average speed of oxygen molecules in the air at STP ?

A ) 5 m / s   ,                                            B ) 15 m / s , 

C ) 25 m / s  ,                                           D ) None of these ,

Correct Answer : -  B ) 15 m / s , 

Solution : -

Formula : -

v = √(3RT/M)  .

M = 32   ,  R = 8.314  J / mol.  , T = 273 K

v = √( 3 x 8.314 x 273 / 32 )  =  15 m / s  ,  Answer .

 

6 ) A gaseous mixture contains oxygen and hydrogen in ratio 1 : 4  by  weight .  Therefore the ratio of no. of molecules : -

A ) 1 / 32 ,                                           B ) 7 / 16 ,

C )  7 / 32 ,                                          D ) None of these ,

Correct Answer : -   C )  7 / 32 ,  

Now go to online quiz section and Chemistry Quiz 4 is uploaded related to these mcqs  , so check your preparation by this link : -

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