Which statement is wrong? (a) Ordinary hydrogen is an equilibrium mixture of ortho and para hydrogen (b) In ortho hydrogen spin of two nuclei is in same direction
An orange coloured solution acidified with H2SO4 and treated with a substance 'X' gives a blue coloured solution of CrO5. The substance 'X' is
(a) H2O2
(b) H2O
(c) dil HCl
(d) conc. HCl
Correct answer: (a) H2O2
Explanation:
K2Cr2O7 an orange coloured solution, on acidification with dil H2SO4 is oxidised by H2O2 to blue peroxide of chromium, CrO5, which is unstable.
K2Cr2O7 + H2SO4 → K2SO4 + H2Cr2O7
[H2O2 → H2O + [O]] x 4
H2Cr2O7 + 4[O] → 2CrO5 + H2O
K2Cr2O7 + H2SO4 + 4H2O2 → 2CrO5 + K2SO4 + 5H2O
-
Hydrogen peroxide in its reaction with KIO4 and NH2OH respectively is acting as a
7 months ago
-
30 volume hydrogen peroxide means (a) 30% of H2O2 solution (b) 30 cm3 solution contains 1g of H2O2
7 months ago
-
Saline hydrides react explosively with water, such fires can be extinguished by
7 months ago
-
When zeolite (hydrated sodium aluminium silicate) is treated with hard water, the sodium ions are exchanged with
7 months ago
-
Which substance does not speed up decomposition of H2O2?
7 months ago
Latest Post: Assertion: Excess of nitrates in drinking water are harmful for infants. Our newest member: The Consequences Of Failing To... Recent Posts Unread Posts Tags
Forum Icons: Forum contains no unread posts Forum contains unread posts
Topic Icons: Not Replied Replied Active Hot Sticky Unapproved Solved Private Closed
Super Globals
Requests: Array ( )
Server: Array ( )