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⁺ →

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:

(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.

(i) Complete the following equations : (a) 2MnO₄⁻ + 5SO₃²⁻ + 6H⁺ → (b) Cr₂O₇²⁻ + 6Fe²⁺ + 14H⁺ → (ii) Based on the data, arrange Fe²⁺, Mn²⁺ and Cr²⁺ in the increasing order of stability of +2 oxidation state. E°(Cr³⁺/Cr²⁺) = -0.4 V E°(Mn³⁺/Mn²⁺) = +1.5 V E°(Fe³⁺/Fe²⁺) = + 0.8 V

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

The molar conductivity of 0.025 mol L⁻¹ methanoic acid is 46.1 S cm² mol⁻¹. Calculate its degree of dissociation and dissociation constant. Given λ°(H⁺) = 349.6 S cm² mol⁻¹ and λ°(HCOO⁻) = 54.6 S cm² mol⁻¹.

Out of the following pairs, predict with reason which pair will allow greater conduction of electricity: (i) Silver wire at 30°C or silver wire at 60°C. (ii) 0.1 M \(CH_3\)COOH solution or 1 M \(CH_3\)COOH solution. (iii) KCl solution at 20°C or KCl solution at 50°C.

(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 \(mol^{–1}\)

The vapour pressure of pure liquids A and B at 400 K are 450 and 700 mm Hg respectively. Find out the composition of liquid mixture if total pressure at this temperature is 600 mm Hg.

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