{"id":19116,"date":"2021-02-22T10:09:04","date_gmt":"2021-02-22T04:39:04","guid":{"rendered":"https:\/\/ncertsolutions.guru\/?p=19116"},"modified":"2021-02-22T10:10:06","modified_gmt":"2021-02-22T04:40:06","slug":"mcq-questions-for-class-12-chemistry-chapter-6","status":"publish","type":"post","link":"https:\/\/ncertsolutions.guru\/mcq-questions-for-class-12-chemistry-chapter-6\/","title":{"rendered":"MCQ Questions for Class 12 Chemistry Chapter 6 General Principles and Processes of Isolation of Elements with Answers"},"content":{"rendered":"

Students are advised to practice the NCERT MCQ Questions for Class 12 Chemistry Chapter 6 General Principles and Processes of Isolation of Elements with Answers Pdf free download is available here. MCQ Questions for Class 12 Chemistry with Answers<\/a> are prepared as per the Latest Exam Pattern. Students can solve these General Principles and Processes of Isolation of Elements Class 12 MCQs Questions with Answers and assess their preparation level.<\/p>\n

General Principles and Processes of Isolation of Elements Class 12 MCQs Questions with Answers<\/h2>\n

Solving the General Principles and Processes of Isolation of Elements Multiple Choice Questions of Class 12 Chemistry Chapter 6 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on General Principles and Processes of Isolation of Elements Class 12 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 6 Chemistry Class 12 and cross-check your answers during preparation.<\/p>\n

Question 1.
\nCinnabar is an ore of
\n(a) Hg
\n(b) Ag
\n(c) Sn
\n(d) Al<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) Hg<\/p>\n<\/details>\n

\n

Question 2.
\nPyrolusite is an ore of
\n(a) Ag
\n(b) Hg
\n(c) Sn
\n(d) Mn<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (d) Mn<\/p>\n<\/details>\n

\n

Question 3.
\nMalachite is an ore of
\n(a) Hg
\n(b) Cu
\n(c) Sn
\n(d) Mn<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (b) Cu<\/p>\n<\/details>\n

\n

Question 4.
\nThe process employed for the concentration of sulphide ore is
\n(a) Froth floatation
\n(b) Roasting
\n(c) Electrolysis
\n(d) Calcination<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) Froth floatation<\/p>\n<\/details>\n

\n

Question 5.
\nZone-refining is used for the
\n(a) concentration of an ore
\n(b) reduction of metal oxide
\n(c) purification of metal
\n(d) purification of an ore.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) purification of metal<\/p>\n<\/details>\n

\n

Question 6.
\nThe metal always found in free state is
\n(a) Gold
\n(b) Silver
\n(c) Copper
\n(d) Sodium<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) Gold<\/p>\n<\/details>\n

\n

Question 7.
\nBauxite is an ore of
\n(a) Aluminium
\n(b) Calcium
\n(c) Copper
\n(d) Zinc<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) Aluminium<\/p>\n<\/details>\n

\n

Question 8.
\nMost abundant element in earth\u2019s crust is
\n(a) O
\n(b) Si
\n(c) Al
\n(d) Fe<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) 0<\/p>\n<\/details>\n

\n

Question 9.
\nWhich of the following ores is concentrated by the froth floatation process?
\n(a) Haematite
\n(b) Magnetite
\n(c) Copper pyrite
\n(d) Bauxite<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) Copper pyrite<\/p>\n<\/details>\n

\n

Question 10.
\nCommon impurities present in bauxite ore:
\n(a) CuO
\n(b) ZnO
\n(c) Fe2<\/sub>O3<\/sub>
\n(d) None of these<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) Fe2<\/sub>O3<\/sub><\/p>\n<\/details>\n

\n

Question 11.
\nIn which of the following minerals Al is not present?
\n(a) Cryolite
\n(b) Mica
\n(c) Feldspar
\n(d) Fluorspar<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (d) Fluorspar<\/p>\n<\/details>\n

\n

Question 12.
\nIn the metallurgy of iron from haematite, limestone is added to act as
\n(a) flux
\n(b) slag
\n(c) a reducing agent
\n(d) an oxidising agent<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) flux<\/p>\n<\/details>\n

\n

Question 13.
\nPurest form of iron is
\n(a) cast iron
\n(b) wrought iron
\n(c) steel
\n(d) pig iron<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (b) wrought iron<\/p>\n<\/details>\n

\n

Question 14.
\nIn the extraction of chlorine by electrolysis of brine
\n(a) oxidation of Cl–<\/sup> ion to chlorine gas occurs.
\n(b) reduction of Cl–<\/sup> ion to chlorine gas occurs.
\n(c) for overall reaction \u0394G\u0398<\/sup> has negative value.
\n(d) a displacement reaction takes place.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) for overall reaction \u0394G\u0398<\/sup> has negative value.<\/p>\n<\/details>\n

\n

Question 15.
\nWhen copper ore is mixed with silica in a reverberatory furnace, copper matte is produced. The copper matte contains
\n(a) sulphides of copper (II) and iron (II)
\n(b) sulphides of copper (II) and iron (III)
\n(c) sulphides of copper (I) and iron (II)
\n(d) sulphides of copper (I) and iron (III)<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) sulphides of copper (I) and iron (II)<\/p>\n<\/details>\n

\n

Question 16.
\nWhich of the following reactions is an example of auto reduction?
\n(a) Fe3<\/sub>O4<\/sub> + 4C0 \u2192 3Fe + 4CO2<\/sub>
\n(b) Cu2<\/sub>O + C \u2192 2Cu + CO
\n(c) Cu2+<\/sup>(aq) + Fe(s) \u2192 Cu(s) + Fe2+<\/sup>(aq)
\n(d) Cu2<\/sub>O + \\(\\frac { 1 }{2}\\) Cu2<\/sub>S \u2192 3Cu + \\(\\frac { 1 }{2}\\) SO2<\/sub><\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (d) Cu2<\/sub>O + \\(\\frac { 1 }{2}\\) Cu2<\/sub>S \u2192 3Cu + \\(\\frac { 1 }{2}\\) SO2<\/sub><\/p>\n<\/details>\n

\n

Question 17.
\nA number of elements are available in earth\u2019s crust but most abundant elements are
\n(a) Al and Fe
\n(b) Al and Cu
\n(c) Fe and Cu
\n(d) Cu and Ag<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) Al and Fe<\/p>\n<\/details>\n

\n

Question 18.
\nZone refining is based on the principle that
\n(a) impurities of low boiling metals can be separated by distillation.
\n(b) impurities are more soluble in molten metal than in solid metal.
\n(c) different components of a mixture are differently adsorbed on an adsorbent.
\n(d) vapours of volatile compound can be decomposed in pure metal.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (b) impurities are more soluble in molten metal than in solid metal.<\/p>\n<\/details>\n

\n

Question 19.
\nIn the extraction of copper from its sulphide ore, the metal is formed by the reduction of Cu2<\/sub>O with
\n(a) FeS
\n(b) CO
\n(c) Cu2<\/sub>S
\n(d) SO2<\/sub><\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) Cu2<\/sub>S<\/p>\n<\/details>\n

\n

Question 20.
\nBrine is electrolysed by using inert electrodes. The reaction at anode is
\n(a) Cl–<\/sup> (aq.) \u2192 \\(\\frac { 1 }{2}\\) Cl2<\/sub> (g) + e–<\/sup>; E\\(_{ cell }^{\u0398}\\) = 1.36 V
\n(b) 2H2<\/sub>O (l) \u2192 O2<\/sub> (g) + 4H+<\/sup> + 4e–<\/sup>; E\\(_{ cell }^{\u0398}\\) = 1.23 V
\n(c) Na+<\/sup> (aq.) + e–<\/sup> \u2192 Na(s); E\\(_{ cell }^{\u0398}\\) = 2.71 V
\n(d) H+<\/sup> (aq.) + e–<\/sup> \u2192 \\(\\frac { 1 }{2}\\) H2<\/sub> (g); E\\(_{ cell }^{\u0398}\\) = 0.00 V<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) Cl–<\/sup> (aq.) \u2192 \\(\\frac { 1 }{2}\\) Cl2<\/sub> (g) + e–<\/sup>; \\(_{ cell }^{\u00ae}\\) = 1.36 V<\/p>\n<\/details>\n

\n

Question 21.
\nIn …………… the metallurgy of aluminium
\n(a) Al3+<\/sup> is oxidised to Al (s).
\n(b) graphite anode is oxidised to carbon monoxide and carbon dioxide.
\n(c) oxidation state of oxygen changes in the reaction at anode.
\n(d) oxidation state of oxygen changes in the overall reaction involved in the process.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (b) graphite anode is oxidised to carbon monoxide and carbon dioxide.<\/p>\n<\/details>\n

\n

Question 22.
\nElectrolytic refining is used to purify which of the following metals?
\n(a) Cu and Zn
\n(b) Ge and Si
\n(c) Zr and Ti
\n(d) Zn and Hg<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) Cu and Zn<\/p>\n<\/details>\n

\n

Question 23.
\nExtraction of gold and silver involves leaching the metal with CN–<\/sup> ion. The metal is recovered by
\n(a) displacement of metal by some other metal from the complex ion.
\n(b) roasting of metal complex.
\n(c) calcination followed by roasting.
\n(d) thermal decomposition of metal complex.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) displacement of metal by some other metal from the complex ion.<\/p>\n<\/details>\n

\n

Answer the questions 24-26 on the basis of the figure given below:<\/span>
\n\"MCQ<\/p>\n

Question 24.
\nChoose the correct option of temperature at which carbon reduces FeO to iron and produces CO.
\n(a) Below temperature at point A.
\n(b) Approximately at the temperature corresponding to point A.
\n(c) Above temperature at point A but below temperature at point D.
\n(d) Above temperature at point A.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (d) Above temperature at point A.<\/p>\n<\/details>\n

\n

Question 25.
\nBelow point \u2018A\u2019 FeO can
\n(a) be reduced by carbon monoxide only.
\n(b) be reduced by both carbon monoxide and carbon.
\n(c) be reduced by carbon only.
\n(d) not be reduced by both carbon and carbon monoxide.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) be reduced by carbon monoxide only.<\/p>\n<\/details>\n

\n

Question 26.
\nFor the reduction of FeO at the temperature corresponding to point D, which of the following statements is correct?
\n(a) \u0394G value for the overall reduction reaction with carbon monoxide is zero.
\n(b) \u0394G value for the overall reduction reaction with a mixture of 1 mol carbon and 1 mol oxygen is positive.
\n(c) \u0394G value for the overall reduction reaction with a mixture of 2 mol carbon and 1 mol oxygen will be positive.
\n(d) \u0394G value for the overall reduction reaction with carbon monoxide is negative.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) \u0394G value for the overall reduction reaction with carbon monoxide is zero.<\/p>\n<\/details>\n

\n

Assertion and Reason Type Questions<\/span><\/p>\n

The questions given below consist of an assertion and a reason. Use the following key to choose the appropriate answer.
\n(a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).
\n(b) Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).
\n(c) Assertion (A) is correct, Reason (R) is wrong statement.
\n(d) Assertion (A) is wrong, but Reason (R) is correct statement.<\/p>\n

Question 27.
\nAssertion: Oxide and carbonate ores are concentrated by froth floatation process.
\nReason: In froth floatation, pine oil is used because it preferentially wets the ore particles.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (d) Assertion (A) is wrong, but Reason (R) is correct statement.<\/p>\n<\/details>\n

\n

Question 28.
\nAssertion: Gold and platinum occur in native state.
\nReason: Gold and platinum are expensive metals.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (b) Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).<\/p>\n<\/details>\n

\n

Question 29.
\nAssertion: Aluminothermy is used for the extraction of Cr from Cr2<\/sub>O3<\/sub>.
\nReason: Aluminium has a high melting point.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (b) Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).<\/p>\n<\/details>\n

\n

Question 30.
\nAssertion: Titanium can be purified by Van Arkel process.
\nReason: Titanium form volatile Til4<\/sub> unstable compound.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).<\/p>\n<\/details>\n

\n

Question 31.
\nAssertion: In Mond process, nickel is heated in a stream of CO forming a volatile complex.
\nReason: This is an electrolytic refining method.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) Assertion (A) is correct, Reason (R) is wrong statement.<\/p>\n<\/details>\n

\n

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Students are advised to practice the NCERT MCQ Questions for Class 12 Chemistry Chapter 6 General Principles and Processes of Isolation of Elements with Answers Pdf free download is available here. MCQ Questions for Class 12 Chemistry with Answers are prepared as per the Latest Exam Pattern. Students can solve these General Principles and Processes …<\/p>\n

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