Q. 65.0( 3 Votes )

i. Give an example for a combination reaction which is exothermic.

ii. Identify the oxidising agent, reducing agent in the following reaction:

H2S + Cl2 2HCl + S

iii. Name the phenomenon due to which the taste and smell of oily food changes when kept for a long time in open. Suggest one method to prevent it.

Answer :

(i) Combination reactions are those reaction in which two compounds combine to give one product. Combination reactions are always exothermic.


CaO + H2O Ca(OH)2 + Heat


(ii) An oxidising agent is one which oxidises to something and a reducing agent is one which reduces to something.


In this reaction, H2S is a reducing agent because it is reducing to Cl2 and Cl2 is an oxidising agent because it is oxidising to H2S.


(iii) The phenomenon due to which the taste and smell of oily food changes when kept for a long time in open is known as rancidity. It is prevent by keeping the oily food in airtight container.


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Genius Quiz | Alphabet Test and Alphanumeric Series49 mins
Alphabet Test46 mins
ScoreUp - A Year Long Foundation Course for Class 1024 mins
Champ Quiz | Alphabet Test47 mins
What is a DNA Test ??FREE Class
What is a DNA Test38 mins
Quiz | Test Your Speed and AccuracyFREE Class
GTSE Sample Paper & Imp Q. Discussion35 mins
GTSE Sample Paper & Imp Q. Discussion28 mins
Quiz | Test Your Friendship With Spherical Mirrors.38 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
view all courses
RELATED QUESTIONS :