When $\mathrm{H}_2 \mathrm{O}_2$ is added to a solution of acidified sodium dichromate, a deep blue colour is observed due to the formation of a peroxo complex. This change signifies that
dichromate ion is oxidised.
hydrogen peroxide is reduced.
oxidation state of Cr remains same.
hydrogen peroxide acts as an oxidising agent.
How long should water be electrolysed using 50 A current to release enough $\mathrm{H}_2$ gas to completely reduce 8.0 g of CuO ?
$\left(\mathrm{CuO}+\mathrm{H}_2 \longrightarrow \mathrm{Cu}+\mathrm{H}_2 \mathrm{O}\right.$; Atomic mass of $\mathrm{Cu}=635 \mathrm{u}$ )
1600 s
1930 s
2415 s
1280 s
$$ \text { Match List-I with List-II. } $$
| List I (Mixture) |
List II (Distinguishing test) |
||
|---|---|---|---|
| A. | Ethanal, propanone | I. | Brady's reagent |
| B. | Benzaldehyde, acetophenone | II. | Tollen's reagent |
| C. | Phenol, aniline | III. | Neutral $\mathrm{FeCl}_3$ |
| D. | Cyclohexene, cyclohexane | IV. | Baeyer's reagent |
Choose the correct match from the options given below
A-I, B-II, C-III, D-IV
A-II, B-I, C-IV, D-III
A-III, B-I, C-II, D-IV
A-II, B-IV, C-I, D-III
How many moles of $\mathrm{KMnO}_4$ are required to oxidise 1 mole of oxalic acid in acidic medium?
0.5 mol
0.25 mol
0.4 mol
0.1 mol
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