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General Principles & Processes of Isolating Elemen

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General Principles & Processes of Isolating Elemen Class 12th

Leaching of gold with dilute aqueous solution of NaCN in presence of oxygen gives complex [A], which on reaction with zinc forms the elemental gold an another complex [B], [A] and [B], respectively are

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General Principles & Processes of Isolating Elemen Class 12th

(a) Baryte (b) Galena (c) Zinc blende and (d) Copper pyrites. How many of these minerals are sulphide based?

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Payal Gupta

Contributor-Level 10

Baryte – BaSO₄ [Sulphate based ore]

Galena – PbS

Zinc blende – ZnS

Copper pyrite – CuFeS₂

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General Principles & Processes of Isolating Elemen Class 12th

Which of the following chemical reaction represents Hall-Heroult process

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alok kumar singh

Contributor-Level 10

In Hall Heroult process electrolysis is carried out using carbon anode. The liberated

O2 at anode reacts with anode.

Cathode : $A l^{3 +} (m e l t) + 3 e k \to A l (l)$

Anode : $\begin{array}{l} C (s) + O^{2 -} (M e l t) \to C O (g) + 2 e \\ C (s) + 2 O^{2 -} (M e l t) \to C O_{2} (g) + 4 e \end{array}$

Net Reaction 2Al2O3 + 3C $4 A l + 3 C O_{2}$

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General Principles & Processes of Isolating Elemen Class 12th

Match List – I with List – II:

List – I &nbs

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Vishal Baghel

Contributor-Level 10

Sphalarite ZnS

Calamine ZnCO₃

Galena PbS

Siderite FeCO₃

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General Principles & Processes of Isolating Elemen Class 12th

Among the following, basic oxide is:

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alok kumar singh

Contributor-Level 10

CaO – Basic Oxide

SO₃ & SiO₂ – Acidic oxides

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General Principles & Processes of Isolating Elemen Class 12th

Match List – I with List – II:

List – I (Ore) List – II (Composition)

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Vishal Baghel

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Ore Formula

Siderite FeCO₃

Malachite &n

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General Principles & Processes of Isolating Elemen Chemistry NCERT Exemplar Solutions Class 12th Chapter Two

The most common oxidation state of Lanthanoid elements is +3. Which of the following is likely to deviate easily from +3 oxidation state?

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Vishal Baghel

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$C e^{3 +} \to [X e] 4 f^{1} 5 d^{0}$

$C e^{4 +} \to [X e] 4 f^{0} 5 d^{0}$ (Noble gas configuration)

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General Principles & Processes of Isolating Elemen Chemistry NCERT Exemplar Solutions Class 12th Chapter One

Match List I with List II:

List-I (Processes/Reactions)	List-II (Catalyst)
(A) 2SO₂(g) + O₂(g) -->2SO₃(g)	(I) Fe(s)
(B) 4NH₃(g) + 5O₂(g)--> 4NO(g) + 6H₂O(g)	(II) Pt(s) – Rh(s)
(C) N₂(g) + 3H₂(g) --> 2NH₃(g)	(III) V₂O₅
(D) Vegetable oil (I) + H₂ --> Vegetable ghee(s)	(IV) Ni(S)