What is the oxidation number of sulphur in Na2S2O5?
2
3
4
7
H2O2 is
a catalyst
an oxidising agent
a reducing agent
both '2' and '3'
Which of the following oxide, cannot act as a reducing agent?
NO2
SO2
CO2
ClO2
If for a reaction ΔGo = 0, then the rate constant of this reaction is
zero
one
less than one
more than one
If emf of the cell Zn| Zn2 (0.01 M)| | Fe2+ (0.001 M) | Fe at 298 K is 0.2957, then the value of equilibrium constant for the cell reaction is?
The oxidation number of sulphur in H2S is
-2
+3
+2
-3
In the reaction : 14 H+ + Cr2O72- + 3Ni → 2Cr3+ + 7H2O + 3Ni2+, which of the following substance is a reducing agent?
H2O
Ni
H+
Cr2O72-
Which of the following reaction occurs at the cathode?
Fe2+ → Fe3+ + e-
Ag→ Ag2+ + e-
Cu2+ + 2e- → Cu
2OH- → H2O + O + 2e-
The chemical reaction,2AgCl(s) + H2(g) → 2HCl(aq) + 2Ag(s) takes place in a galvanic cell, is represented by the notation
Pt(s) |H2(g), 1 bar| 1 M KCl(aq)| |AgCl(s)| Ag(s)
Pt(s) |H2(g), 1 bar| 1 MHCl(aq)| |Ag(s) |AgCl(s)
Pt(s) |H2(g), 1 bar| 1 M HCl(aq)| |AgCl(s)| Ag(s)
Pt(s) |H2(g), 1 bar| 1 MHCl(aq)| |1 M Ag+(aq)| Ag(s)
The charge on one electron is (Avogadro's number = 6.023 × 1023)
1 × 10-19 C
1.6 × 10-19 C
2.6 × 10-19 C
3.6 × 10-19 C
