A first-order reaction is 50% completed in 40 minutes at 300 K and in 20 minutes at 320 K. Calculate the activation energy of the reaction.
(Given: log 2 = 0.3010, log 4 = 0.6021, R = 8.314 JK–1 mol–1)
What happens when
A freshly prepared precipitate of Fe(OH)3 is shaken with a small amount of FeCl3 solution?
Give reasons:
H3PO3 undergoes disproportionation reaction but H3PO4 does not.
H3PO3 undergoes disproportionation reaction but H3PO4 does not. This is because in H3PO3, P is in +3 oxidation state which can get oxidised as well as reduced. Thus, H3PO3 gives disproportionation, reaction as:
On the other hand, in H3PO4, P is in its maximum oxidation state of +5, which can duly be reduced but not oxidised further. So, H3PO4 does not show disproportionation.