1 ) What is concentration of nitrate ions , if equal volume 0.1 M AgNO3 and 0.1 M of NaCl are mixed together ? A ) 0.05 M , B ) 1.0 M , C ) 1.5 M , D ) None of these ,

1 ) What is concentration of nitrate ions , if equal volume 0.1 M AgNO3 and 0.1 M of NaCl are mixed together ?

A ) 0.05 M ,                                              B ) 1.0 M ,

C ) 1.5 M ,                                               D ) None of these ,

Correct Answer : -  A ) 0.05 M ,

Solution : -

So AgNO3 has two ions = 0.1 / 2  =  0.05 M  ,   Answer .

So ,  0.05 mole of nitrate ions are produced .

 

2 ) The volume in liters of CO2 liberated at STP when 10 gram of 90 % pure limestone is heated completely is : -

A ) 1 ,                                               B ) 2 ,

C ) 4 ,                                              D ) None of these ,

Correct Answer : - B ) 2 ,

Solution : -

CaCO3 ------> CaO + CO2 ,

limestone : -  CaCO3 ,

So molecular mass of CaCO3 = 100   g / mole .

90 % of 10 g of limestone  =  10 x 90 / 100  =  9 gram .

So , moles of limestone = mass / molecular mass = 9 / 100 = 0.09 mol .

so ,

1 M  of CaCO3 =  1 M of CO2 .

0.09 M of CaCO3  =  0.09 M of CO2 .

So now calculate volume of CO2 at STP : -

volume =  moles x STP = 0.09 x 22.4 = 2  ,  Answer .

 

3 ) The favorable conditions for ammonia production from Haber process are : -

A ) High pressure and low temperature ,

B ) Low pressure and high temperature ,

C ) Not effected by pressure and temperature ,                     

D ) None of these ,

Correct Answer : -  A ) High pressure and low temperature ,

Because by high pressure , no. of moles will get decrease  and by low temperature , the reaction will get exothermic .

 

4 ) Order of joule , calorie and erg : -

1 calorie > 1 Joule > 1 erg .

Because ;

1 joule = 10^7 erg .

1 calorie = 4.18 joule .

 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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