WBJEE · Chemistry · Thermodynamics (C)
For a spontaneous reaction at all temperatures which of the following is correct?
- A Both \(\Delta \mathrm{H}\) and \(\Delta \mathrm{S}\) are positive
- B \(\Delta \mathrm{H}\) is positive and \(\Delta \mathrm{S}\) is negative
- C \(\Delta \mathrm{H}\) is negative and \(\Delta \mathrm{S}\) is positive
- D Both \(\Delta \mathrm{H}\) and \(\Delta \mathrm{S}\) are negative
Answer & Solution
Correct Answer
(C) \(\Delta \mathrm{H}\) is negative and \(\Delta \mathrm{S}\) is positive
Step-by-step Solution
Detailed explanation
For spontancity \(\Delta G\) must be negative \(\because \Delta \mathrm{G}=\Delta \mathrm{H}-\mathrm{T} \Delta \mathrm{S}\) To be negative at all Temperature, \(\Delta \mathrm{H} 0\)
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Chemistry
- The standard Gibbs free energy change \(\left(\Delta G^{o}\right)\) at \(25^{\circ} \mathrm{C}\) for the dissociation of \(\mathrm{N}_{2} \mathrm{O}_{4}(\mathrm{g})\) to \(\mathrm{NO}_{2}(g)\) is (given, equilibrium constant \(=0.15, R=8.314 \mathrm{JK} / \mathrm{mol})\)WBJEE 2013 Medium
- Among the following compounds, the onele that gives (give) effervescence with aqueoug \(\mathrm{NaHCO}_{3}\) solution is (are)
WBJEE 2014 Easy - Among the following carbocations :
(I) \(\mathrm{Ph}_{2}\stackrel{+}{\mathrm{C}} \mathrm{CH}_{2} \mathrm{Me}(\mathrm{II}) \mathrm{Ph} \mathrm{CH}_{2} \mathrm{CH}_{2} \stackrel{+}{\mathrm{C}} \mathrm{HPh}\)
(III) \(\mathrm{Ph}_{2} \mathrm{CH} \stackrel{+}{\mathrm{C}} \mathrm{HMe}\) (IV) \(\mathrm{Ph}_{2} \mathrm{C}(\mathrm{Me}) \stackrel{+}{\mathrm{C}} H_{2}\) the order of stability is :WBJEE 2012 Easy - Suppose a gaseous mixture of \(\mathrm{He}, \mathrm{Ne}, \mathrm{Ar}\) and \(\mathrm{Kr}\) is treated with photons of the frequency appropriate to ionize Ar. What ion(s) will be present in the mixture?WBJEE 2023 Easy
- To a solution of a colourless efflorescent sodium salt, when dilute acid is added, a colourless gas is evolved along with formation of a white precipitate. Acidified dichromate solution turns green when the colourless gas is passed through it. The sodium salt isWBJEE 2020 Easy
- The shape of \(XeF_{5}^{-}\) will beWBJEE 2017 Easy
More PYQs from WBJEE
- The coefficient of \(x^{10}\) in the expansion of \(1+(1+x)+\dots+(1+x)^{20}\)WBJEE 2012 Medium
- An artificial satellite moves in a circular orbit around the earth. Total energy of the satellite is given by \(E\). The potential energy of the satellite isWBJEE 2014 Easy
- The length of an open organ pipe is twice the length of another closed organ pipe. The fundamental frequency of the open pipe \(100 \mathrm{Hz}\). The frequency of the third harmon of the closed pipe isWBJEE 2015 Medium
- In the IUPAC system, \(PhCH_{2}CH_{2}\mathrm{CO}_{2} \mathrm{H}\) is named asWBJEE 2017 Medium
- If \(A=\left(\begin{array}{cc}3 & x-1 \\ 2 x+3 & x+2\end{array}\right)\) is a symmetric matrix, then the value of \(x\) isWBJEE 2011 Easy
- The co-ordinate of a point on the auxiliary circle of the ellipse \(x^{2}+2 y^{2}=4\) corresponding to the point on the ellipse whose eccentric angle is \(60^{\circ}\) will beWBJEE 2021 Easy