LIVE Course for free

Rated by 1 million+ students
Get app now
+2 votes
in Chemistry by (29.8k points)

A reaction, A + B → C + D + q is found to have a positive entropy change. The reaction will be 

(i) possible at high temperature 

(ii) possible only at low temperature 

(iii) not possible at any temperature 

(iv) possible at any temperature 

1 Answer

+2 votes
by (128k points)
selected by
Best answer

For a reaction to be spontaneous, ∆G should be negative. 

∆G = ∆H – T∆S 

According to the question, for the given reaction, 

∆S = positive 

∆H = negative (since heat is evolved) 

⇒ ∆G = negative Therefore, the reaction is spontaneous at any temperature. 

Hence, alternative (iv) is correct. 

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.