What is the electronic configuration of chromium atom (Z = 24)? Give a reason for your answer.
The electronic configuration of Cr (24) is 1s2, 2s2p6, 3s2p6d5,4s1.
This is because an electronic configuration with half-filled and completely filled orbitals is more stable. Cr has 3d orbitals half filled configuration which is more stable than normally expected i.e 3d4 4s2.
i) State the second law of thermodynamics in terms of the entropy of the universe.
(ii) Calculate the maximum work that can be obtained from the given electrochemical cell constructed with two metals M and N.
The cell reaction is M + N+2 → M+2 + N
To precipitate group III cations NH4Cl should be added to the solution before the addition of ammonium hydroxide. Explain why.
A study of chemical kinetics of the reaction A+B → products, gave the following data at 25°C:
Find:
(1) The order of reaction with respect to A.
(2) The order of reaction with respect to B.
(3) The rate law.