The reaction is spontaneous , if the cell potential is ( - ve ) , by this reaction will proceed in ............. , A ) Forward direction , B ) Reverse direction , C ) Stop , D ) None of these ,

1 ) The reaction is spontaneous , if the cell potential is ( + ve ) , by this reaction will proceed in . . . . . . . . . . . . . . . ,

A ) Forward direction  ,                    B ) Reverse direction ,

C ) Stop ,                                           D ) None of these ,

Correct Answer : -  A ) Forward direction  ,

 

2 )  A + B = product  ,    r = k[A][B]    .    If B is taken in excess , then this reaction will be . . . . . . . . . . . . . . . ,

A ) 1^st  order reaction ,                                                   B ) 2^nd order reaction ,

C ) 3^rd  order reaction ,                                                   D ) None of these ,

Correct Answer : -   A ) 1^st  order reaction ,

Because    ,    r = k[A][B]°   ( when B is taken in excess and as B is taken constant ) .  

 

3 ) In normal excited state , the electron can reside for . . . . . . . . . . . . . . . ( 10^-3sec ) .

 

4 )  The minimum energy in ( ev ) required to strip off ten times ionized sodium atom , ( I.e  z = 11 ) of its last electron is ?

A ) 0 ev ,                                                     B )   -13.6 × 11² ( ev ),  

C ) (-13.6 × 11²)/2²  ( ev ),                                    D ) None of these ,

Correct Answer : -

Solution : -

Formula : -

E = (-13.6 z² ) / n² ,

E = (-13.6 × 11²) / 1² ,

E = -13.6 × 11² ( ev ),   Answer .

 

5 ) Mechanical work for gasous system is also known as . . . . . . . . . . . . . . . . . ( Pressure - volume work ) .

Because they undergoes expansion , contractions with change of pressure .

 

6 ) which one have same no. of protons , electrons , neutrons ?

A ) N2 and CO2 .                                                 B ) N2 and CO .

C ) N3 and CO .                                                   D ) None of these ,

Correct Answer : -  B ) N2 and CO .

 

7 ) High pH means solution is . . . . . . . . . . . . . . . ,

A ) Acidic ,                                        B ) Basic ,

C ) Neutral ,                                                D ) None of these ,

Correct Answer : -  B ) Basic ,

 

8 ) High pOH means solution is . . . . . . . . . . . . . . . . ,

A ) Acidic ,                                        B ) Basic ,

C ) Neutral ,                                                D ) None of these ,

Correct Answer : -   A ) Acidic ,     

 

9 )  Idea of pH and pOH is given by . . . . . . . . . . . . . . . . . . ,

A ) Mosley ,                                               B ) Sorenson ,

C )  J Thomson ,                               D ) None of these ,

Correct Answer : - B ) Sorenson ,

 

10 )  According to le-chartelier principle , as the concentration of products increase , the reaction proceeds in . . . . . . . . . . . . . . . . . ,

A ) Forward direction ,                      B ) Backwards direction ,

C ) Stops ,                                        D ) None of these ,

Correct Answer : -    B ) Backwards direction ,

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