Question

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

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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⁺ →

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More 3 Marks Questions:

(i) Give reasons for the following : (a) Compounds of transition elements are generally coloured. (b) MnO is basic while Mn₂O₇ is acidic. (ii) Calculate the magnetic moment of a divalent ion in aqueous medium if its atomic number is 26.

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]

(a) Calculate G° for the reaction Zn(s) + \(Cu^{2+}\)(aq) → \(Zn^{2+}\)(aq) + Cu(s) Given: E° for \(Zn^{2+}\)/Zn = -0.76V and E° for \(Cu^{2+}\)/Cu = +0.34 V R = 8.314 \(JK^{–1}\) \(mol^{–1}\), F = 96500 \(mol^{–1}\)

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

The magnetic moment of few transition metal ions are given below:

Consider the reaction: Cr₂O₇²⁻ + 14H⁺ + 6e⁻ -> 2Cr³⁺ + 7H₂O. What is the quantity of electricity in coulombs needed to reduce 1 mol of Cr₂O₇²⁻?

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

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