Redox Reactions...

The standard redox potentials (E^o) of the following reactions are as follows.

I. MnO₄^- + 8H⁺ + 5e^- Mn²⁺ + 4H₂O E^o = 1.51 V
II. Sn²⁺ Sn⁴⁺ + 2e^- E^o = -0.15 V
III. Cr₂O₇^2- + 14H⁺ + 6e^- 2Cr³⁺ + 7H₂O E^o = 1.33 V
IV. Ce³⁺ Ce⁴⁺ + e^- E^o = -1.61 V

In which of the following options is the oxidising power of the various ions wrongly related?

Directions: The following question has four choices out of which ONLY ONE is correct.

In acidic medium, dichromate ion oxidizes ferrous ion to ferric ion. If the gram molecular weight of potassium dichromate is 294 g, its gram equivalent weight is

Directions: The following question has four choices out of which ONLY ONE is correct.

If equal volumes of 1 M KMnO₄ and 1 M K₂Cr₂O₇ solutions are allowed to oxidize Fe (II) to Fe (III) in acidic medium, then Fe (II) oxidization will be

Directions: The following question has four choices out of which ONLY ONE is correct.

Consider the following half reactions:

Zn²⁺ Zn(s); E⁰ = - 0.76V
Cu²⁺ Cu(s); E⁰ = - 0.34V

Which of the following reactions is spontaneous?

In the balanced equation H₂SO₄ + x HI H₂S + y I₂ + z H₂O, what are the values of x, y and z?

Redox reaction between copper and aqueous solution of silver nitrate happens when copper rod is dipped in silver nitrate solution. What happens in the final stage?

The mass of H₂O₂ that is completely oxidised with 31.2 g of KMnO₄ (molar mass = 158 g mol^–1) in acidic medium is

The formation of sodium chloride involves two half reaction, which clearly show involvement of electrons.
2 Na (s) → 2 Na + (g) + 2e Cl2 (g) + 2e → 2 Cl (g)
Sum of the half reactions gives
2 Na(s) +Cl2 (g) → 2 Na+ Cl (s) or 2 NaCl (s)

In terms of electron-transfer change, name the oxidising agent(s) and reducing agent(s)

HBr and HI can reduce sulphuric acid. HCl can reduce KMnO₄ and HF can reduce

What is the reduction product in the reaction 2KMnO₄ + 16HCl 5Cl₂ + 2MnCl₂ + 2KCl + 8H₂O?

The reaction  is

Directions: The following question has four choices out of which ONLY ONE is correct.

The oxidation number of carbon in CH₂O is

For the reaction between KMnO₄ and H₂O₂, the number of electrons transferred per mole of H₂O₂ is:

Oxidation and reduction always occur simultaneously, hence, the word “redox” was coined for this class of chemical reactions. In the following redox reaction, identify the species undergoing oxidation and reduction:

3Fe₃O₄(s) + 8 Al (s) → 9 Fe (s) + 4Al₂O₃(s)

The oxidation state of an element in a particular compound can be defined as:

The reduction potentials of A, B, C and D are 0.8 V, 0.79 V, 0.34 V and -2.37 V, respectively. Which element displaces all the other three elements?

Oxygen has a positive oxidation state in

In which of the following compounds does the carbon atom have zero oxidation state?

Directions: The following question has four choices out of which ONLY ONE is correct.

One mole of acidified K₂Cr₂O₇ on reaction with excess KI will liberate ___ mole(s) of I₂.

The electron releasing tendency of the metals, zinc, copper and silver is in the order: