When 1 Faraday current is passed, which of the following would deposit 1g atomic weight of the metal?
NaCl
BaCl2
AlCl3
CuSO4
Consider the values : EoFe3+/Fe2+ = +0.77 V and EoSn2+/Sn = - 0.14 V. Under standard conditions, the potential for the reaction Sn(s) + 2Fe3+(aq) → 2Fe2+(aq) + Sn2+(aq) is
0.63 V
0.91 V
1.40 V
1.68 V
HNO2 acts both as reductant and oxidant, while HNO3 acts only as oxidant. Why?
solubility ability
maximum oxidation number
minimum oxidation number
minimum number of valence electron
A smuggler could not carry gold by depositing iron on the gold surface, because
iron rusts
gold is denser
gold has lower standard reduction potential than iron
gold has higher standard reduction potential than iron
The standard e.m.f of a cell, involving one electron change is 0.591 V 25oC. The equilibrium constant of the reaction is (F = 96500 C-mol-1; R = 8.314 J - K-1 - mol-1)
1.0 × 101
1.0 ×105
1.0 ×1010
1.0 ×1030
Which of the following shows maximum number of oxidation states ?
N
Fe
Mn
Cr
A certain current liberates 0.504g of hydrogen in 2 hours. The copper liberated by the same current flowing for the same time in copper sulphate solution will be
12.7 g
16.0 g
31.8 g
63.5 g
Same amount of electric current is passed through solutions of AgNO3 and HCl. If 1.08 g of silver is obtained in the first case, the volume of hydrogen liberated at S.T.P in the second case is?
22400 ml
2240 ml
224 ml
112 ml
Which of the following element shows maximum number of oxidation states in its compounds?
Eu
La
Gd
Np
The pair of compounds, in which both the metals are in their highest possible oxidation state, is
[Fe(CN)6]3-
TiO3, MnO2
CrO2Cl2, MnO4-
[Co(CN)6]3-, MnO3
