- 1(current)
Q. No.The change in oxidation number of chlorine when Cl2 gas reacts with hot and concentrated sodium hydroxide solution is:
1. Zero to +1 and Zero to –5
2. Zero to –1 and Zero to +5
3. Zero to –1 and Zero to +3
4. Zero to +1 and Zero to –3
In the given balanced chemical reaction
\(\mathrm{IO}_3^{-}+\mathrm{aI}^{-}+\mathrm{bH}^{+} \rightarrow \mathrm{cH}_2 \mathrm{O}+\mathrm{dI}_2\)
The values of a, b, c, and d respectively are:
1. 5, 6, 3, 3
2. 5, 3, 6, 3
3. 3, 5, 3, 6
4. 5, 6, 5, 5
The balanced equation for the reaction between chlorine and sulphur dioxide in water is:
| 1. | Cl2(s) + SO2(aq) + 2H2O(I) →2Cl-(aq) + SO42-(aq) + 4H+(aq) |
| 2. | 3Cl2(s) + SO2(aq) + 2H2O(I) →Cl-(aq) + SO42-(aq) + 3H+(aq) |
| 3. | Cl2(s) + 3SO2(aq) + H2O(I) →Cl-(aq) + 2SO42-(aq) + 4H+(aq) |
| 4. | 2Cl2(s) + SO2(aq) + H2O(I) →2Cl-(aq) + SO42-(aq) + 4H+(aq) |
\(\mathrm{{a} {Cr}_2 {O}_7^{2-}+{bSO}_3^{2-}({aq})+{c} {H}^{+}({aq})} →\)\(\mathrm{2 {a} {Cr}^{3+}({aq})+{bSO}_4^{2-}({aq})+\frac{{c}}{2} {H}_2 {O}(\ell)} \)
| 1. | 8, 1 and 3 | 2. | 1, 3 and 8 |
| 3. | 3, 8 and 1 | 4. | 1, 8 and 3 |
For the redox reaction,
a
the correct stoichiometric coefficients of the reactants a, b, and c respectively for the balanced equation are:
| 1. | 16, 5, 2 | 2. | 2, 5, 16 |
| 3. | 2, 16, 5 | 4. | 5, 16, 2 |
Balance the following equation and choose the quantity that is the sum of the coefficients of reactants and products :
1. 16
2. 13
3. 18
4. 12
In an electrochemical cell, the half-cell reactions with their respective oxidation potentials are
| \(\begin{aligned} &C u(s) \rightarrow C u^{2+}+2 e^{-} ; E^{\circ}=-0.34 V \\ &N i s(s) \rightarrow N i^{2+}+2 e^{-} ; E^{\circ}=+0.25 V \end{aligned} \) |
Which one of the following reactions will be spontaneous?
1. 2Ni(s) + Cu2+(aq) → Ni2+(aq) + 2Cu(s)
2. Ni2+(aq) + Cu(s) → Ni(s) + Cu2+(aq)
3. 2Cu(s) + Ni2+(aq) → 3Cu+ + Ni(s)
4. Ni(s) + Cu2+(aq) → Ni2+(aq) + Cu(s)
- 1(current)
Q. No.
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