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General Principles & Processes of Isolating Elemen

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5 months ago

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

...more

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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)

...more

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Vishal Baghel

Contributor-Level 10

Ore Formula

Siderite FeCO₃

Malachite &n

...more

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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

Contributor-Level 10

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

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

Choose the correct answer from the options given below:

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Vishal Baghel

Contributor-Level 10

$2 S O_{2} (g) + O_{2} (g) \to_{}^{V_{2} O_{5}} 2 S O_{3} (g) c o n t a c t p r o c e s s$

$4 N H_{3} (g) + 5 O_{2} (g) \to_{}^{A (s) - R h (s)} 4 N O (g) + 6 H_{2} O (g)$ ostwald's process

$N_{2} (g) + 3 H_{2} (g) \to_{}^{F e (s)} 2 N H_{3} (g) H a b e r' s p r o c e s s$

Vegetable oil (l) + H₂ $\to_{}^{N i (s)}$ vegetable ghee; Hydrogenation

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

Match List – I with List – II.

List – I List – II

(A) Siderite (i) Cu

(B) Calamine (ii) Ca

...more

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Payal Gupta

Contributor-Level 10

Siderite – FeCO₃ (ore of iron)

Calamine – ZnCO₃ (ore of zinc)

Malachite – CuCO₃.Cu (OH)₂ (ore of copper)

Cryolite – Na₃AlF₆ (ore of aluminium)

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6 months ago

General Principles & Processes of Isolating Elemen Class 12th

6.18 Giving examples differentiate between 'roasting' and 'calcination'.

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Vishal Baghel

Contributor-Level 10

Kindly go through the solution

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7 months ago

General Principles & Processes of Isolating Elemen Class 12th

6.31 Predict conditions under which Al might be expected to reduce MgO.

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Vishal Baghel

Contributor-Level 10

Above 1350^oC, the standard Gibbs free energy formation of Al₂O₃ from Al is less than that of MgO from Mg. Therefore, above 1350^oC, Al can reduce MgO.

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