Question

Write the preparation of following :
(i) KMnO₄ from K₂MnO₄
(ii) Na₂CrO₄ from FeCr₂O₄
(iii) Cr₂O₇²⁻ from CrO₄²⁻

Answer-Image

Similar Questions From D And F Block Elements:

Complete and balance the following chemical equations: (a) Fe²⁺ + MnO₄⁻ + H⁺ → (b) MnO₄⁻ + H₂O + I⁻ →

Assign the reason for the following : Copper (I) ion is not known in aqueous solution.

Complete the following chemical equations : (i) MnO₄⁻(aq) + S₂O₃²⁻(aq) + H₂O(l) → (ii) Cr₂O₇²⁻(aq) + Fe²⁺(aq) + H⁺(aq) →

Write the formula of an oxo-anion of Manganese (Mn) in which it shows the oxidation state equal to its group number.

Write the formula of an oxo-anion of Chromium (Cr) in which it shows the oxidation state equal to its group number.

Complete the following reactions— (i) Cr₂O₇²⁻ + 6Fe²⁺ + 14H⁺ → (ii) 2CrO₄²⁻ + 2H⁺ → (iii) 2MnO₄⁻ + 5C₂O₄²⁻ + 16H⁺ →

Describe the oxidising action of potassium dichromate and write the ionic equations for its reaction with (i) an iodide (ii) H₂S.

More 3 Marks Questions:

Write the preparation of following : (i) KMnO₄ from K₂MnO₄ (ii) Na₂CrO₄ from FeCr₂O₄ (iii) Cr₂O₇²⁻ from CrO₄²⁻

Calculate emf of the following cell Cd/\(Cd^{2+}\) (.10 M)//\(H_+\) (.20 M)/\(H_2\) (0.5 atm)/Pt [Given E° for \(Cd^{2+}\) /Cd = -0.403V]

Consider the standard electrode potential values (M²⁺/M) of the elements of the first transition series.

When a certain conductance cell was filled with 0.1 M KCl, it has a resistance of 85 ohm at 25°C. When the same cell was filled with an aqueous solution of 0.052 M unknown electrolyte, the resistance was 96 ohms. Calculate the molar conductance of the electrolyte at this concentration. [Specific conductance of 0.1 M KCl = 1.29 × 10⁻² ohm⁻¹ cm⁻¹]

Give reasons : (i) Mn shows the highest oxidation state of +7 with oxygen but with fluorine it shows the highest oxidation state of +4. (ii) Transition metals show variable oxidation states. (iii) Actinoids show irregularities in their electronic configurations.

Complete the following reactions— (i) Cr₂O₇²⁻ + 6Fe²⁺ + 14H⁺ → (ii) 2CrO₄²⁻ + 2H⁺ → (iii) 2MnO₄⁻ + 5C₂O₄²⁻ + 16H⁺ →

The electrical resistance of a column of 0.05 M KOH solution of diameter 1 cm and length 45.5 cm is 4.55 × 10³ ohm. Calculate its molar conductivity.

Scroll to Top