CBSE
Multiple Choice QuestionsThe standard molar heat of formation of ethane ,CO2 and water are respectively - 21.1 , - 94.1 and - 68. 3 kcal .The standard molar heat of combustion of ethane will be :
- 372 kcal
162 kcal
- 240 kcal
183.5 kcal
NH4COONH2 (s) 2NH3 (g) + CO2 (g) ,if equlibrium pressure is 3 atm for the above reaction .Kp for the reaction is :
4
27
4/27
1/27
During titration of acetic acid with aqueous NaOH solution, the neutralisation graph has a vertical line. This line indicates
alkaline nature of equivalence
acidic nature of equivalence
neutral nature of equivalence
depends on experimental proceeding
The pH of the solution obtained on neutralisation of 40 mL 0.1 M NaOH with 40 mL 0.1 M CH3COOH is
7
8
6
3
The Ksp of Mg(OH)2 is 1 x 10-12 , 0.01 M Mg(OH)2 will precipitate at the limited pH :
3
9
5
8
Assertion : The equilibrium constant is fixed and a characteristic for any given chemical reaction at a specified temperature.
Reason : The composition of the final equilibrium mixture at a particular temperature depends upon the starting amount of reactants.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
The correct order of increasing [H3O+] in the following aqueous solutions is
0.01 M H2S < 0.01 M H2SO4 < 0.01M NaCl< 0.01 M NaNO2
0.01 M NaCl<0.01 M NaNO2 <0.01 M H2S <0.01 M H2SO4
0.01 M NaNO2 < 0.01 M NaCl < 0.01 M H2S <0.01 M H2SO4
0.01 M H2S < 0.01 M NaNO2 < 0.01 M NaCl <0.01M H2SO4
Assertion : According to Le-Chatelier's principle addition of heat to an equilibrium solid liquid results in decrease in the amount of solid.
Reason : Reaction is endothermic, so on heating forward reaction is favoured.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Assertion : Copper metal gets readily corroded in acidic aqueous solution.
Reason : Free energy change for this process is negative.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
In P versus V graph, the horizontal line is found in which exists
Gas
Liquid
Equilibrium between gas and liquid
Super critical temperature
