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JEE CHEMISTRY MCQ: THERMODYNAMICS

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Understanding +4 | -1
A process which is unfavourable with respect to enthalpy,
but favourable with respect to entropy
View answer and explanation
Correct option: B
could occur at high temperatures, but not at low
temperatures
Option B is correct because a process unfavorable in enthalpy but favorable in entropy can occur at high temperatures where the entropy term dominates the Gibbs free energy equation.

More Questions from THERMODYNAMICS

Practice All Chapter MCQs β†’
Consider following reactions
I: Β C(s)+12O2(Β g)βˆ’CO(g),Ξ”H1=a\ \mathrm{C}(\mathrm{s})+\frac{1}{2} \mathrm{O}_2(\mathrm{~g})-\mathrm{CO}(\mathrm{g}), \Delta \mathrm{H}_1=\mathrm{a}

II: CO(g)+12O2(Β g)βˆ’CO2(Β g),Ξ”H2=b\mathrm{CO}(\mathrm{g})+\frac{1}{2} \mathrm{O}_2(\mathrm{~g})-\mathrm{CO}_2(\mathrm{~g}), \Delta \mathrm{H}_2=\mathrm{b}

III: C(s)+CO2(Β g)βˆ’2CO(g);Ξ”H3=c\mathrm{C}(\mathrm{s})+\mathrm{CO}_2(\mathrm{~g})-2 \mathrm{CO}(\mathrm{g}) ; \Delta \mathrm{H}_3=\mathrm{c}
Select the correct statement
When 0.18Β g0.18 \mathrm{~g} of glucose was burnt in a bomb calorimeter, the temperature rose by 4Β K.4 \mathrm{~K}. The heat capacity of the calorimeter system is (Ξ”CH∘=βˆ’2.8Γ—106Β J/molΒ glucose)\left(\Delta_{\mathrm{C}} \text{H}^{\circ}=-2.8\times 10^6 \mathrm{~J} / \mathrm{mol} \text{ glucose}\right) Statement-1: CsI{CsI} is less soluble in water compared to CsCl{CsCl}
Satement-2: More amount of heat is liberated during the formation of CsCl{CsCl} than the formation CsI{Cs} I from their elements
Consider the following processes :

Ξ”H(KJ/mol)1/2Aβ†’B+1503Bβ†’2C+Dβˆ’125E+Aβ†’2D+350\begin{array}{cccccccccccccccccccc} {}&{\Delta H(KJ/mol)} \\ {1/2A \to B}&{ + 150} \\ {3B \to 2C + D}&{ - 125} \\ {E + A \to 2D}&{ + 350} \end{array}

For B+D→E+2C,ΔH{B}+{D} \rightarrow {E}+2 {C}, \Delta {H} will be :
The difference b/w Ξ”H\Delta H and Ξ”u\Delta u at constant volume is equal to The heat evolved in the combustion of methane is given by the following equations CH4(g)+2O2(g)β†’CO2(g)+H2O(l);Ξ”H=βˆ’890.3kJ\mathrm{C}{\mathrm{H}_4}\left( \mathrm{g} \right) + 2{\mathrm{O}_2}\left( \mathrm{g} \right) \to \mathrm{C}{\mathrm{O}_2}\left( \mathrm{g} \right) + {\mathrm{H}_2}\mathrm{O}\left( l \right);\Delta H = - 890.3\mathrm{kJ} How many grams of methane would be required to produce 44.15 kJ of heat of combustion?
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