MCQ
Which of the following statements is true
- A$\Delta E$ is always greater than $\Delta H$
- B$\Delta E$ is always less than $\Delta H$
- ✓$\Delta E$ may be lesser or greater or equal to $\Delta H$
- D$\Delta E$ is always proportional to$\Delta H$
✓
Answer
Correct option: C.
$\Delta E$ may be lesser or greater or equal to $\Delta H$
(c) $\Delta E$ may be greater or lesser or equal to $\Delta H$.
$\because \Delta H = \Delta E + P\Delta V = \Delta E + \Delta nRT.$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Bond order is a concept in the molecular orbital theory. It depends on the number of electrons in the bonding and antibonding orbitals. Which of the following statements is true about it ? The bond order
The long form of periodic table is based on
Assertion : Addition of silver ions to a mixture of aqueous sodium chloride and sodium bromide solution will first precipitate $AgBr$ rather than $AgCl$
Reason : $K_{sp}$ of $AgCl < K_{sp}$ of $AgBr$
→Reason : $K_{sp}$ of $AgCl < K_{sp}$ of $AgBr$
Which of the following is $D-$ isomer
→Assertion : Absorption spectrum consists of some bright lines separated by dark spaces.
Reason : Emission spectrum consists of dark lines.
Reason : Emission spectrum consists of dark lines.
Match List$-I$ with List$-II$
→| List$-I$ | List$-II$ |
| $(A)$ Spontaneous process | $(I)\,\Delta H < 0$ |
| $(B)$ Process with $\Delta P =0 \;\Delta T =0$ | $(II)\,\Delta G _{ T , P } < 0$ |
| $(C)\,\Delta H _{reaction}$ | $(III)$ Isothermal and isobaric process |
| $(D)$ Exothermic process | $(IV)$ [Bond energies of molecules in reactants] - [Bond energies of product molecules] |
Choose the correct answer from the options given below:
Aromatic hydrocarbons are the derivatives :
In ${N_2}$ molecule, the atoms are bonded by
→Carbon atoms in the compound ${(CN)_4}{C_2}$ are
→The electron in the $n ^{\text {th }}$ orbit of $Li ^{2+}$ is excited to $(n+1)$ orbit using the radiation of energy $1.47 \times 10^{-17}\,J$ (as shown in the diagram). The value of $n$ is $....$.Given $R_H=2.18 \times 10^{-18}\,J$
→