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General Principles and Processes of Isolation of Elements
Why is the extraction of copper from pyrites more difficult than that ...

Why is the extraction of copper from pyr | Class 12 Chemistry Chapter General Principles and Processes of Isolation of Elements, General Principles and Processes of Isolation of Elements NCERT Solutions

Welcome to the NCERT Solutions for Class 12 Chemistry - Chapter General Principles and Processes of Isolation of Elements. This page offers a step-by-step solution to the specific question from Exercise 2, Question 3: . With detailed answers and explanations for each chapter, students can strengthen their understanding and prepare confidently for exams. Ideal for CBSE and other board students, this resource will simplify your study experience.

Question 3:

Why is the extraction of copper from pyrites more difficult than that from its oxide ore through reduction?

Answer:

The Gibbs free energy of formation (Δ_fG) of Cu₂S is less than that of H₂S and CS₂. Therefore, H₂and C cannot reduce Cu₂S to Cu.

On the other hand, the Gibbs free energy of formation of Cu₂O is greater than that of CO. Hence, C can reduce Cu₂O to Cu.

C_(s) +Cu₂O_(s) → 2Cu_(s) + CO_(g)

Hence, the extraction of copper from its pyrite ore is difficult than from its oxide ore through reduction.

Other Questions of Chapter General Principles and Processes of Isolation of Elements

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

The value of Δ_fG^øfor formation of Cr₂O₃ is - 540 kJmol^-1 and that of Al₂ O₃ is - 827 kJmol^-1. Is the reduction of Cr₂O₃ possible with Al?

What is the role of cryolite in the metallurgy of aluminium?

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

Write down the reactions taking place in different zones in the blast furnace during the extraction of iron.

How can you separate alumina from silica in bauxite ore associated with silica? Give equations, if any.

Out of C and CO, which is a better reducing agent for ZnO ?

Why is zinc not extracted from zinc oxide through reduction using CO?

Differentiate between "minerals" and "ores".

Copper can be extracted by hydrometallurgy but not zinc. Explain.

Popular questions of class 12 Chemistry

How the following conversions can be carried out?

(i) Propene to propan-1-ol

(ii) Ethanol to but-1-yne

(iii) 1-Bromopropane to 2-bromopropane

(iv) Toluene to benzyl alcohol

(v) Benzene to 4-bromonitrobenzene

(vi) Benzyl alcohol to 2-phenylethanoic acid

(vii) Ethanol to propanenitrile

(viii) Aniline to chlorobenzene

(ix) 2-Chlorobutane to 3, 4-dimethylhexane

(x) 2-Methyl-1-propene to 2-chloro-2-methylpropane

(xi) Ethyl chloride to propanoic acid

(xii) But-1-ene to n-butyliodide

(xiii) 2-Chloropropane to 1-propanol

(xiv) Isopropyl alcohol to iodoform

(xv) Chlorobenzene to p-nitrophenol

(xvi) 2-Bromopropane to 1-bromopropane

(xvii) Chloroethane to butane

(xviii) Benzene to diphenyl

(xix) tert-Butyl bromide to isobutyl bromide

(xx) Aniline to phenylisocyanide

Give simple chemical tests to distinguish between the following pairs of compounds.

(i) Propanal and Propanone

(ii) Acetophenone and Benzophenone

(iii) Phenol and Benzoic acid

(iv) Benzoic acid and Ethyl benzoate

(v) Pentan-2-one and Pentan-3-one

(vi) Benzaldehyde and Acetophenone

(vii) Ethanal and Propanal

A 5% solution (by mass) of cane sugar in water has freezing point of 271 K. Calculate the freezing point of 5% glucose in water if freezing point of pure water is 273.15 K.

A solution of glucose in water is labelled as 10% w/w, what would be the molality and mole fraction of each component in the solution? If the density of solution is 1.2 g mL^-1, then what shall be the molarity of the solution?

Henry's law constant for CO₂ in water is 1.67 x 10⁸Pa at 298 K. Calculate the quantity of CO₂in 500 mL of soda water when packed under 2.5 atm CO₂pressure at 298 K.

Calculate the mass of a non-volatile solute (molar mass 40 g mol^-1) which should be dissolved in 114 g octane to reduce its vapour pressure to 80%.

The vapour pressure of pure liquids A and B are 450 and 700 mm Hg respectively, at 350 K. Find out the composition of the liquid mixture if total vapour pressure is 600 mm Hg. Also find the composition of the vapour phase.

Calculate the mole fraction of benzene in solution containing 30% by mass in carbon tetrachloride.

How many mL of 0.1 M HCl are required to react completely with 1 g mixture of Na₂CO₃ and NaHCO₃ containing equimolar amounts of both?

If NaCl is doped with 10^-3mol % of SrCl₂, what is the concentration of cation vacancies?

Recently Viewed Questions of Class 12 Chemistry

Henry's law constant for CO₂ in water is 1.67 x 10⁸Pa at 298 K. Calculate the quantity of CO₂in 500 mL of soda water when packed under 2.5 atm CO₂pressure at 298 K.

What are nucleic acids? Mention their two important functions.

What are the different oxidation states exhibited by the lanthanoids?

The reaction between A and B is first order with respect to A and zero order with respect to B. Fill in the blanks in the following table:

Experiment	A/ mol L^{- 1}	B/ mol L^{- 1}	Initial rate/mol L^{- 1} min^{- 1}
I	0.1	0.1	2.0 × 10^{- 2}
II	--	0.2	4.0 × 10^{- 2}
III	0.4	0.4	--
IV	--	0.2	2.0 × 10^{- 2}

Mention the conditions required to maximise the yield of ammonia.

Ionic solids conduct electricity in molten state but not in solid state. Explain.

Describe the oxidising action of potassium dichromate and write the ionicequations for its reaction with:

(i) iodide

(ii) iron

(II) solution and

(iii) H₂S

What type of solids are electrical conductors, malleable and ductile?

Write the structure of the major organic product in each of the following reactions:

Ferric oxide crystallises in a hexagonal close-packed array of oxide ions with two out of every three octahedral holes occupied by ferric ions. Derive the formula of the ferric oxide.

Study Tips for Answering NCERT Questions:

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Read the question carefully and focus on the core concept being asked.
Reference examples and data from the chapter when answering questions about General Principles and Processes of Isolation of Elements.
Review previous year question papers to get an idea of how such questions may be framed in exams.
Practice answering questions within the time limit to improve your speed and accuracy.
Discuss your answers with your teachers or peers to get feedback and improve your understanding.

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Comments

aadil
Jul 01, 2021

The value of âfG â for formation of Cr2O3 is -540 KJ mol-1 and that of Al2O3 -827 KJ mol-1 . Is the reduction of Cr2O3 possible with Al ?

Qwert
Oct 12, 2019

Ok partha,you try your best

Kumar sid
Aug 23, 2019

Bahot hi aacha

Santya kumar
Jun 09, 2019

Nice answer

partha
Apr 25, 2018

Nice answer .could hav tried litle mich better