Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • NCERT
  • The value of Delta f G 0 for formation of Cr 2 O 3 is – 540 k J mol minus 1 and that of Al 2 O 3 is – 827 k J mol minus 1. Is the reduction of Cr 2 O 3 possible with Al ?

6.21 The value of
\Delta _ f G ^ \thetafor formation of Cr _ 2 O _3 is - 540 KJ mol ^{-1}and that of Al_2 O_3 \: \: is \: \: -827 KJ mol^{-1}. Is the reduction of Cr _ 2 O _3 possible with Al?

Answers (1)

best_answer

 

2Al+3/2O_{2}\rightarrow Al_{2}O_{3}......................... (-827 KJ/mol)
2Cr+3/2O_{2}\rightarrow Cr_{2}O_{3}.........................  (-540 KJ/mol)
_________________________________          (On subtracting)
2Al+Cr_{2}O_{3}\rightarrow Al_{2}O_{3}+2Cr      ...............(-287 KJ/mol)                                                       

In the above reaction, we see that \Delta_f G^0 of formation of Cr is negative (-287 KJ/mol) Hence the reduction of  Cr _ 2 O _3 with aluminium is possible.

Posted by

manish

View full answer

Crack CUET with india's "Best Teachers"

  • HD Video Lectures
  • Unlimited Mock Tests
  • Faculty Support
cuet_ads

Similar Questions

Trending Articles/News

anam-khan

CBSE Class 12 Computer Science Exam Analysis 2025: Paper 'moderate', but 'tougher' than last three years
anam-khan

CBSE Class 12 Accountancy Exam Analysis 2025: Paper ‘moderate', includes application-based questions
anam-khan

CBSE mulls allowing non-programmable, basic calculators for class 12 Accountancy exam

Latest Question