ABC Modern Chemistry for Class 12. We covered all the ABC Modern Chemistry for Class 12 in this post for free so that you can practice well for the exam.
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ABC Modern Chemistry for Class 12 Objective for Students
Which is not an endothermic reaction among the following?
(A) Combustion of methane
(B) Decomposition of water
(C) Dehydration of ethane to ethene
(D) Conversion of graphite to diamond
Option a – Combustion of methane
The standard molar enthalpy of the formation of CO2 is equal to
(A) Zero
(B) Standard molar enthalpy of combustion
(C) the Sum of standard molar enthalpies of the formation of CO(g) and CO2
(D) Standard molar enthalpy of combustion of carbon
Option d – Standard molar enthalpy of combustion of carbon
Enthalpy change is equal to internal energy change when
(A) All reactants and products are solutions.
(B) Reaction in a closed container
(C) No. of moles of gases reactants and products are equal.
(D) Reaction occurs at constant pressure.
Option c – No. of moles of gases reactants and products are equal
Which of the following species have zero enthalpies at their standard state?
(A) Br2
(B) Cl2
(C) H₂O
(D) CH4
Option b – Cl2
The free energy change of a reaction is zero when
(A) The reactants are initially mixed
(B) A catalyst is added
(C) the System is at an equilibrium
(D) the Reactants are completely consumed.
Option c – the System is at an equilibrium
The change in entropy of an ideal gas during reversible isothermal expansion is
(A) Negative
(B) Zero
(C) Positive
(D) Infinite
Option c – Positive
We covered all the abc modern chemistry for class 12 above in this post for free so that you can practice well for the exam.
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