- 1(current)
Q. No.\(XZn+ NO^- _3+ YH^+ \rightarrow XZn^{2+}+ NH^+ _4+ ZH_2O \)
1. 4, 10, 3
2. 3, 8, 3
3. 3, 10, 3
4. 4, 3, 10
\(\text{NO}^-_3\rightarrow \text{NH}^+_4\)
When balanced with the smallest whole-number coefficients, what is the sum of all the coefficients and electrons used?
1. 13
2. 26
3. 15
4. 23
Consider the given reaction:
\(\mathrm{Al}+\mathrm{Fe}_3 \mathrm{O}_4 \rightarrow \mathrm{Al}_2 \mathrm{O}_3+\mathrm{Fe}\)
What is the total number of electrons transferred in the given reaction?
1. 6
2. 8
3. 8/3
4. 24
In an electrochemical cell, the half-cell reactions with their respective oxidation potentials are:
\(\begin{aligned} &C u(s) \rightarrow C u^{2+}+2 e^{-} ; E^{\circ}=-0.34 V \\ &N i s(s) \rightarrow N i^{2+}+2 e^{-} ; E^{\circ}=+0.25 V \end{aligned} \)
The reaction, among the following, that will be spontaneous is:
1. 2Ni(s) + Cu2+(aq) → Ni2+(aq) + 2Cu(s)
2. Ni2+(aq) + Cu(s) → Ni(s) + Cu2+(aq)
3. 2Cu(s) + Ni2+(aq) → 3Cu+(aq) + Ni(s)
4. Ni(s) + Cu2+(aq) → Ni2+(aq) + Cu(s)
\(\mathrm{S}_2 \mathrm{O}_3{ }^{2-}(\mathrm{aq})+\mathrm{OH}^{-}(\mathrm{aq}) \rightarrow \mathrm{SO}_4{ }^{2-}(\mathrm{aq})+\mathrm{H}_2 \mathrm{O}(\mathrm{l})+\mathrm{e}^{-}\)
After balancing the above reaction, what are the coefficients of \(\text{OH}^-\) and \(\text{SO}_4^{2-}\) respectively?
| 1. | 8 and 3 | 2. | 6 and 2 |
| 3. | 10 and 2 | 4. | 5 and 2 |
\(\mathrm{xCl}_2+\mathrm{yOH}^{-} \longrightarrow \mathrm{zCl}^{-}+\mathrm{pClO}^{-}\)
1. \(\text{x}=1,\text{y}=2,\text{z}=2,\text{p}=1\)
2. \(\text{x}=\text{y}=\text{z}=\text{p}=1\)
3. \(\text{x}=1,\text{y}=1,\text{z}=2,\text{p}=1\)
4. \(\text{x}=1,\text{y}=2,\text{z}=1,\text{p}=1\)
Number of moles of K2Cr2O7 required to oxidise 1 mole of ferrous oxalate in acidic medium are:
1. \(1 \over 2\)
2. \(1 \over 3\)
3. \(1\over 6\)
4. 2
If 10 gm of V2O5 is dissolved in acid and is reduced to V2+ by zinc metal, how many moles of I2 could be reduced by the resulting solution if it is further oxidized to VO2+ ions?
[Assume no change in state of Zn2+ions] (V = 51, O =16, I = 127) :
| 1. | 0.11 mole of I2 | 2. | 0.22 mole of I2 |
| 3. | 0.055 mole of I2 | 4. | 0.44 mole of I2 |
- 1(current)
Q. No.
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