MCQOPTIONS
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MCQOPTIONS
This section includes 11242 Mcqs, each offering curated multiple-choice questions to sharpen your Joint Entrance Exam - Main (JEE Main) knowledge and support exam preparation. Choose a topic below to get started.
| 1001. |
A metal which is refined by poling is [RPET 2000] |
| A. | Sodium |
| B. | Blister copper |
| C. | Zinc |
| D. | Silver |
| Answer» C. Zinc | |
| 1002. |
Silver obtained from argentiferrous lead containing lead impurity is purified by [CPMT 1981; MP PMT 1990; EAMCET 1998] |
| A. | Distillation |
| B. | Froth floatation |
| C. | Cupellation |
| D. | Treatment of \[KCN\] |
| Answer» D. Treatment of \[KCN\] | |
| 1003. |
Which one of the following is manufactured by the electrolysis of fused sodium chloride [CPMT 1979, 83, 91] |
| A. | \[NaOH\] |
| B. | \[NaClO\] |
| C. | \[Na\] |
| D. | \[NaCl{{O}_{3}}\] |
| Answer» D. \[NaCl{{O}_{3}}\] | |
| 1004. |
In electrolytic refining of metals, electrolysis of an aqueous solution of its complex salt is done with impure metal as anode and an strip of pure metal as cathode. This method cannot be used for the refining of the metal [MP PMT 1989] |
| A. | Silver |
| B. | Copper |
| C. | Aluminium |
| D. | Zinc |
| Answer» E. | |
| 1005. |
Which of the following metals cannot be extracted by carbon reduction process [AMU 1982] |
| A. | \[Pb\] |
| B. | \[Al\] |
| C. | \[Hg\] |
| D. | \[Zn\] |
| Answer» C. \[Hg\] | |
| 1006. |
The electrolytic method of reduction is employed for the preparation of metals that [MP PMT 1991; NCERT 1984; CPMT 1988; KCET 2002] |
| A. | Are weakly electropositive |
| B. | Are moderately electropositive |
| C. | Are strongly electropositive |
| D. | Form oxides |
| Answer» D. Form oxides | |
| 1007. |
The substance used in the thermite process of reducing metal ores is [MP PET 1993; CPMT 2000, 01] |
| A. | Aluminium |
| B. | Thorium |
| C. | Heated Pt gauge |
| D. | Carbon |
| Answer» B. Thorium | |
| 1008. |
Furnaces are lined with calcium oxide because |
| A. | It gives off oxygen on heating |
| B. | It gives strong light on heating |
| C. | It is refractory and basic |
| D. | It is not affected by acids |
| Answer» D. It is not affected by acids | |
| 1009. |
In blast furnace iron oxide is reduced by [MP PMT 1989; KCET 2005] |
| A. | Silica |
| B. | \[CO\] |
| C. | Carbon |
| D. | Lime stone |
| Answer» C. Carbon | |
| 1010. |
Alumino-thermic process is used for the extraction of metals, whose oxides are |
| A. | Fusible |
| B. | Not easily reduced by carbon |
| C. | Not easily reduced by hydrogen |
| D. | Strongly basic |
| Answer» C. Not easily reduced by hydrogen | |
| 1011. |
To obtain chromium from chromic oxide \[(C{{r}_{2}}{{O}_{3}}),\] the method used is [JIPMER 2001] |
| A. | Alumino-thermic process |
| B. | Electrolytic reduction |
| C. | Carbon reduction |
| D. | Carbon monoxide reduction |
| Answer» B. Electrolytic reduction | |
| 1012. |
The substance used in the thermite process of reducing metal ores is [CPMT 2000; KCET 2001; UPSEAT 2001] |
| A. | Aluminium |
| B. | Thorium |
| C. | Heated platinum gauze |
| D. | Carbon |
| Answer» B. Thorium | |
| 1013. |
Which metal can't be obtained from electrolysis [CPMT 1997; RPET 1999] |
| A. | \[Cu\] |
| B. | \[Mg\] |
| C. | \[Cr\] |
| D. | \[Ni\] |
| Answer» C. \[Cr\] | |
| 1014. |
Alumino-thermic process is used for metallurgy of [CPMT 1996] |
| A. | \[Pb\] |
| B. | \[Ag\] |
| C. | \[Al\] |
| D. | None of these |
| Answer» E. | |
| 1015. |
Electrometallurgy is used for |
| A. | Transition metals |
| B. | Most reactive metals |
| C. | Noble metals |
| D. | Soft metals |
| Answer» C. Noble metals | |
| 1016. |
Function of the flux added during smelting is |
| A. | To make ore porous |
| B. | To remove gangue |
| C. | To make reduction easier |
| D. | To precipitate slag |
| Answer» C. To make reduction easier | |
| 1017. |
Aluminium is produced on a large scale by electrolysis of alumina, dissolved in fused cryolite and a little fluorspar. These two electrolytes, cryolite and fluorspar are respectively |
| A. | \[N{{a}_{3}}Al{{F}_{6}}\] and \[Ca{{F}_{2}}\] |
| B. | \[Al{{F}_{3}}\] and \[KF\] |
| C. | \[A{{l}_{2}}{{C}_{6}}\] and \[KCl\] |
| D. | \[KCl.MgC{{l}_{2}}.6{{H}_{2}}O\] and \[Mg{{F}_{2}}\] |
| Answer» B. \[Al{{F}_{3}}\] and \[KF\] | |
| 1018. |
In the metallurgical extraction of zinc from \[ZnO\] the reducing agent used is [MP PET 1994] |
| A. | Carbon monoxide |
| B. | Sulphur dioxide |
| C. | Carbon dioxide |
| D. | Nitric oxide |
| Answer» B. Sulphur dioxide | |
| 1019. |
After partial roasting, the sulphide of copper is reduced by [MP PMT 1993] |
| A. | Reduction by carbon |
| B. | Electrolysis |
| C. | Self-reduction |
| D. | Cyanide process |
| Answer» D. Cyanide process | |
| 1020. |
High purity copper metal is obtained by [MP PMT 1991] |
| A. | Carbon reduction |
| B. | Hydrogen reduction |
| C. | Electrolytic reduction |
| D. | Thermite reduction |
| Answer» D. Thermite reduction | |
| 1021. |
Iron is obtained on a large scale from \[F{{e}_{2}}{{O}_{3}}\] by [CPMT 1973, 78, 79; Orissa JEE 2005] |
| A. | Reduction with \[Al\] |
| B. | Reduction with \[CO\] |
| C. | Reduction with \[{{H}_{2}}\] |
| D. | Reduction with sodium |
| Answer» C. Reduction with \[{{H}_{2}}\] | |
| 1022. |
Which technique is used in the manufacture of aluminium from bauxite [NCERT 1983] |
| A. | Reduction with magnesium |
| B. | Reduction with coke |
| C. | Electrolytic reduction |
| D. | Reduction with iron |
| Answer» D. Reduction with iron | |
| 1023. |
Which of the following processes does not involve a catalyst [KCET 1991] |
| A. | Haber's process |
| B. | Thermite process |
| C. | Ostwald process |
| D. | Contact process |
| Answer» C. Ostwald process | |
| 1024. |
Which metal is extracted by electrolytic reduction method [CPMT 1984; MP PET 1997] |
| A. | \[Cu\] |
| B. | \[Al\] |
| C. | \[Fe\] |
| D. | \[Ag\] |
| Answer» C. \[Fe\] | |
| 1025. |
In alumino-thermite process, aluminium is used as [IIT 1983; DPMT 1980; MP PMT 1987; MP PET/PMT 1988; NCERT 1983; UPSEAT 2003] |
| A. | Oxidising agent |
| B. | Flux |
| C. | Reducing agent |
| D. | Solder |
| Answer» D. Solder | |
| 1026. |
Alumina is |
| A. | \[Al{{(OH)}_{3}}\] |
| B. | \[AlC{{l}_{3}}\] |
| C. | \[AIN\] |
| D. | \[A{{l}_{2}}{{O}_{3}}\] |
| Answer» E. | |
| 1027. |
Aluminium is prepared in large quantities by [KCET 1991, 92] |
| A. | Heating cryolite in a limited quantity of air |
| B. | Reducing aluminium oxide with coke |
| C. | Reducing aluminium oxide with sodium |
| D. | Electrolysing aluminium oxide dissolved in fused electrolyte |
| Answer» E. | |
| 1028. |
Chemical reduction is not suitable for converting [MP PET 1994] |
| A. | Bauxite into aluminium |
| B. | Cuprite into copper |
| C. | Haematite into iron |
| D. | Zinc oxide into zinc |
| Answer» B. Cuprite into copper | |
| 1029. |
Which one of the following metals is extracted by thermal reduction process? [EAMCET 1986] |
| A. | Copper |
| B. | Iron |
| C. | Aluminium |
| D. | Magnesium |
| Answer» C. Aluminium | |
| 1030. |
Electrometallurgical process is used to extract [MNR 1985, 89; UPSEAT 2000; MP PMT 2001] |
| A. | \[Fe\] |
| B. | \[Pb\] |
| C. | \[Na\] |
| D. | \[Ag\] |
| Answer» D. \[Ag\] | |
| 1031. |
Carbon reduction process is used for the extraction of |
| A. | \[Hg\] |
| B. | \[Zn\] |
| C. | \[Cr\] |
| D. | \[Fe\] |
| Answer» E. | |
| 1032. |
For the redox reaction \[MnO_{4}^{-}+{{C}_{2}}O_{4}^{-2}+{{H}^{+}}\to \,M{{n}^{2+}}+C{{O}_{2}}+{{H}_{2}}O\] the correct coefficients of the reactants for the balanced reaction are [IIT 1988, 92; BHU 1995; CPMT 1997; RPMT 1999; DCE 2000; MP PET 2003] |
| A. | \[MnO_{4}^{-}\] \[{{C}_{2}}O_{4}^{2-}\] \[{{H}^{+}}\] 2 5 16 |
| B. | 16 5 2 |
| C. | 5 16 2 |
| D. | 2 16 5 |
| Answer» B. 16 5 2 | |
| 1033. |
What is ?A? in the following reaction \[2F{{e}^{3+}}_{(aq)}+S{{n}^{2+}}_{(aq)}\to 2F{{e}^{2+}}_{(aq)}+A\] [MP PET 2003] |
| A. | \[S{{n}^{3+}}_{(aq)}\] |
| B. | \[S{{n}^{4+}}_{(aq)}\] |
| C. | \[S{{n}^{2+}}_{(aq)}\] |
| D. | Sn |
| Answer» C. \[S{{n}^{2+}}_{(aq)}\] | |
| 1034. |
When \[KMn{{O}_{4}}\] acts as an oxidising agent and ultimately forms \[{{[\,Mn{{O}_{4}}]}^{-2}},\,\,Mn{{O}_{2}},\,\,\,M{{n}_{2}}{{O}_{3}},\,\,M{{n}^{+2}}\] then the number of electrons transferred in each case respectively is [AIEEE 2002] |
| A. | 4, 3, 1, 5 |
| B. | 1, 5, 3, 7 |
| C. | 1, 3, 4, 5 |
| D. | 3, 5, 7, 1 |
| Answer» D. 3, 5, 7, 1 | |
| 1035. |
\[2MnO_{4}^{-}+5{{H}_{2}}{{O}_{2}}+6{{H}^{+}}\to 2\,\,Z+5{{O}_{2}}+8{{H}_{2}}O\]. In this reaction Z is [RPMT 2002] |
| A. | \[M{{n}^{+2}}\] |
| B. | \[M{{n}^{+4}}\] |
| C. | \[Mn{{O}_{2}}^{{}}\] |
| D. | \[Mn\] |
| Answer» B. \[M{{n}^{+4}}\] | |
| 1036. |
How many moles of \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] can be reduced by 1 mole of \[S{{n}^{2+}}\] [MP PMT 2003] |
| A. | 1/3 |
| B. | 1/6 |
| C. | 2/3 |
| D. | 1 |
| Answer» B. 1/6 | |
| 1037. |
The number of electrons involved in the reduction of \[C{{r}_{2}}O_{7}^{2-}\]in acidic solution to \[C{{r}^{3+}}\]is [EAMCET 1983] |
| A. | 0 |
| B. | 2 |
| C. | 3 |
| D. | 5 |
| Answer» D. 5 | |
| 1038. |
\[{{C}_{2}}{{H}_{6}}(g)+n{{O}_{2}}\,\to \,C{{O}_{2}}\,(g)+{{H}_{2}}O\,(l)\] In this equation, the ratio of the coefficients of \[C{{O}_{2}}\]and \[{{H}_{2}}O\] is [KCET 1992] |
| A. | 1 : 1 |
| B. | 2 : 3 |
| C. | 3 : 2 |
| D. | 1 : 3 |
| Answer» C. 3 : 2 | |
| 1039. |
The number of moles of \[KMn{{O}_{4}}\]reduced by one mole of KI in alkaline medium is: [CBSE PMT 2005] |
| A. | One fifth |
| B. | five |
| C. | One |
| D. | Two |
| Answer» E. | |
| 1040. |
In the balanced chemical reaction, \[IO_{3}^{-}+a\ {{I}^{-}}+b\ {{H}^{+}}\to c\ {{H}_{2}}O+d\ {{I}_{2}}\] a, b, c and d respectively correspond to [AIIMS 2005] |
| A. | 5, 6, 3, 3 |
| B. | 5, 3, 6, 3 |
| C. | 3, 5, 3, 6 |
| D. | 5, 6, 5, 5 |
| Answer» B. 5, 3, 6, 3 | |
| 1041. |
Which of the following is the strongest oxidising agent [Pb. CET 2000] |
| A. | \[BrO_{3}^{-}/B{{r}^{2+}},\,{{E}^{o}}=+1.50\] |
| B. | \[F{{e}^{3+}}/F{{e}^{2+}},\,{{E}^{o}}=+0.76\] |
| C. | \[MnO_{4}^{-}/M{{n}^{2+}},\,{{E}^{o}}=+1.52\] |
| D. | \[C{{r}_{2}}O_{7}^{2-}/C{{r}^{3+}},\,{{E}^{o}}=+1.33\] |
| Answer» D. \[C{{r}_{2}}O_{7}^{2-}/C{{r}^{3+}},\,{{E}^{o}}=+1.33\] | |
| 1042. |
Which of the following reactions involves oxidation-reduction [NCERT 1972; AFMC 2000; Pb. CET 2004; CPMT 2004] |
| A. | \[NaBr+HCl\,\to \,NaCl+HBr\] |
| B. | \[HBr+AgN{{O}_{3}}\,\to \,AgBr+HN{{O}_{3}}\] |
| C. | \[{{H}_{2}}+B{{r}_{2}}\,\to \,2HBr\] |
| D. | \[2NaOH+{{H}_{2}}S{{O}_{4}}\,\to \,N{{a}_{2}}S{{O}_{4}}+2{{H}_{2}}O\] |
| Answer» D. \[2NaOH+{{H}_{2}}S{{O}_{4}}\,\to \,N{{a}_{2}}S{{O}_{4}}+2{{H}_{2}}O\] | |
| 1043. |
Which of the following reaction is a redox reaction [MP PMT 2003] |
| A. | \[{{P}_{2}}{{O}_{5}}+2{{H}_{2}}O\to {{H}_{4}}{{P}_{2}}{{O}_{7}}\] |
| B. | \[2AgN{{O}_{3}}+BaC{{l}_{2}}\to 2AgCl+Ba{{(N{{O}_{3}})}_{2}}\] |
| C. | \[BaC{{l}_{2}}+{{H}_{2}}S{{O}_{4}}\to BaS{{O}_{4}}+2HCl\] |
| D. | \[Cu+2AgN{{O}_{3}}\to 2Ag+Cu{{(N{{O}_{3}})}_{2}}\] |
| Answer» E. | |
| 1044. |
Which of the following is a redox reaction [AIEEE 2002] |
| A. | \[NaCl+KN{{O}_{3}}\to NaN{{O}_{3}}+KCl\] |
| B. | \[Ca{{C}_{2}}{{O}_{4}}+2HCl\to CaC{{l}_{2}}+{{H}_{2}}{{C}_{2}}{{O}_{4}}\] |
| C. | \[Mg{{(OH)}_{2}}+2N{{H}_{4}}Cl\to MgC{{l}_{2}}+2N{{H}_{4}}OH\] |
| D. | \[Zn+2AgCN\to 2Ag+Zn{{(CN)}_{2}}\] |
| Answer» E. | |
| 1045. |
Vander Waal's constants 'a' and 'b' are related with..... respectively [RPMT 1994] |
| A. | Attractive force and bond energy of molecules |
| B. | Volume and repulsive force of molecules |
| C. | Shape and repulsive forces of molecules |
| D. | Attractive force and volume of the molecules |
| Answer» E. | |
| 1046. |
When is deviation more in the behaviour of a gas from the ideal gas equation \[PV=nRT\] [DPMT 1981; NCERT 1982; CBSE PMT 1993] |
| A. | At high temperature and low pressure |
| B. | At low temperature and high pressure |
| C. | At high temperature and high pressure |
| D. | At low temperature and low high pressure |
| Answer» C. At high temperature and high pressure | |
| 1047. |
The temperature at which the second virial coefficient of real gas is zero is called [AFMC 1993] |
| A. | Critical temperature |
| B. | Eutetic point |
| C. | Boiling point |
| D. | Boyle's temperature |
| Answer» E. | |
| 1048. |
Vander Waal's equation of state is obeyed by real gases. For n moles of a real gas, the expression will be [IIT 1992; Pb. CET 1986; DPMT 1986] |
| A. | \[\left( \frac{P}{n}+\frac{na}{{{V}^{2}}} \right)\,\,\left( \frac{V}{n-b} \right)=RT\] |
| B. | \[\left( P+\frac{a}{{{V}^{2}}} \right)\,(V-b)=nRT\] |
| C. | \[\left( P+\frac{na}{{{V}^{2}}} \right)\,(nV-b)=nRT\] |
| D. | \[\left( P+\frac{{{n}^{2}}a}{{{V}^{2}}} \right)\,(V-nb)=nRT\] |
| Answer» E. | |
| 1049. |
In Vander Waal's equation of state for a non-ideal gas, the term that accounts for intermolecular forces is [CBSE PMT 1990; IIT 1988] |
| A. | \[(V-b)\] |
| B. | \[{{(RT)}^{-1}}\] |
| C. | \[\left( P+\frac{a}{{{V}^{2}}} \right)\] |
| D. | RT |
| Answer» D. RT | |
| 1050. |
The compressibility factor of a gas is defined as \[Z=PV/RT\]. The compressibility factor of ideal gas is [Pb. CET 1986] |
| A. | 0 |
| B. | Infinity |
| C. | 1 |
| D. | ?1 |
| Answer» D. ?1 | |