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CBSE 12th Standard Chemistry Subject General Principles and Processes of Isolation of Elements Ncert Exemplar MCQ Questions 2021

Published on: 24/05/2021

QB365 Provides the updated NCERT Exemplar Questions for Class 12, and also provide the detail solution for each and every case study questions. NCERT Exemplar questions are latest updated question pattern from NCERT, QB365 will helps to get more marks in Exams

Download CBSE Class 12th Standard CBSE Chemistry question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Chemistry

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Std: 12th Standard CBSE - Chemistry

chapter: - NCERT Exemplers

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Questions:

Multiple Choice Question

5 x 1 = 5

Zone refining is based on the principle that.....

(a)

impurities of low boiling metals can be separated by distillation

(b)

impurities are more soluble in molten metal than in solid metal

(c)

different components of a mixture are differently adsorbed on an adsorbent

(d)

vapours of volatile compound can be decomposed in pure metal

A number of elements are available in earth,s crust but most abundant elements are __________________.

(a)

Al and Fe

(b)

Al and Cu

(c)

Fe and Cu

(d)

Cu and Ag

Which of the following reactions is an exam[le of autoreduction?

(a)

Fe₃O₄+4CO\(\longrightarrow\)3Fe+4CO₂

(b)

Cu₂O+C\(\longrightarrow\)2Cu+CO

(c)

Cu²⁺(aq)+Fe(s)\(\longrightarrow\)Cu(s)+Fe²⁺(aq)

(d)

Cu₂O+\(1\over2\)Cu₂S\(\longrightarrow\)3Cu+\(1\over2\)SO₂

When copper ore is mixed with silica,in a reverberatory furnace,copper matte is produced.The copper matte contains.....

(a)

sulphides of copper (II) and iron (II)

(b)

sulphides of copper (II) and iron (III)

(c)

sulphides of copper (I) and iron (II)

(d)

sulphides of copper (I) and iron (III)

In the extraction of chlorine by electrolysis of brine.......

(a)

oxidation of Cl^- ions to chlorine gas occurs

(b)

reduction of Cl^-ions to chlorine gas occurs

(c)

for overall reaction \(\Delta\)G⁰ has negative value

(d)

a displacement reaction takes place

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Answers Key:

Multiple Choice Question

5 x 1 = 5

Impurities are more soluble in molten metal than in solid metal

(a)
Al and Fe

(d)
Cu₂O+\(1\over2\)Cu₂S\(\longrightarrow\)3Cu+\(1\over2\)SO₂

Matte consists of Cu₂S+FeS,i.e.,option (c) is correct.

For extraction of metals and non-metals by electrolysis, \(\Delta\)G⁰for the overall reaction is +ve.Thus,option (a),i.e.,oxidation of Cl^- ion to Cl₂ gas is correct.