In the following unbalanced reaction
A2+ + B3+ A4+ + B
The total number of e- transferred during reaction is
1. 2
2. 3
3. 6
4. 8
What will be the value of x and y by balancing the reaction
C2H5OH + X I2 + Y OH- CHI3 + HCO2- + 5I- + 5H2O
1. 4,6
2. 2,6
3. 2,4
4. 4,4
In the given reaction,
xBrO3- + yCr+3 + zH2O Br2 + CrO42- + H+
The coefficients x, y, and z are respectively-
1. 6, 10, 11
2. 6, 10, 20
3. 6, 8, 22
4. 6, 10, 22
In the following reaction
Al + Fe3O4 Al2O3 + Fe
The total number of electrons transferred will be-
1. 6
2. 8
3. 8/3
4. 24
In the balanced chemical reaction,
a, b, c and d respectively correspond to -
(1) 5, 6, 3, 3
(2) 5, 3, 6, 3
(3) 3, 5, 3, 6
(4) 5, 6, 5, 5
From the following, identify the reaction having the top position in the EMF series (standard reduction potential) according to their electrode potential at 298 K.
1. Mg2++ 2e–Mg(s)
2. Fe2+ + 2e– Fe(s)
3. Au3++ 3e–Au(s)
4. K++ le –K(s)
Standard electrode potentials are:
,
Choose the correct observation if , and Fe block are kept together:
1. increases
2. decreases
3. remains unchanged
4. decreases
Consider the given data:
Using the electrode potential values given above, identify the reaction which is not feasible:
1. | Fe3+(aq) and I- aq) |
2. | Ag+(aq) and Cu(s) |
3. | Fe3+(aq) and Cu(s) |
4. | Ag(s) and Fe3+(aq) |
Arrange the metals Al, Cu, Fe, Mg, and Zn in the correct decreasing order based on their ability to displace each other from the solution of their salts:
1. Al> Zn > Fe > Cu > Mg
2. Zn > Fe > Cu > Mg > Al
3. Mg > Al > Zn > Fe > Cu
4. Fe > Mg > Zn > Al > Cu
The correct statement about the electrolysis of an aqueous solution of with Ag electrode is-
1. | Ag+ ion gets oxidised at cathode; Ag(s) is reduced at anode |
2. | H2O gets reduced at cathode; H2O gets oxidised at anode |
3. | Ag+ ion gets reduced at cathode; H2O is oxidised at anode |
4. | Ag+ ion gets reduced at cathode; Ag(s) is oxidised at anode |