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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.
| 951. |
Heating of pyrites in air for oxidation of sulphur is called [CPMT 1973, 75, 78, 79, 94; DPMT 1982, 84, 86; MP PMT 2000, 01, 02] |
| A. | Roasting |
| B. | Calcination |
| C. | Smelting |
| D. | Slagging |
| Answer» B. Calcination | |
| 952. |
In the modern blast furnaces, the charge consists of a mixture of |
| A. | Calcined iron oxides + lime + anthracite coal |
| B. | Calcined iron oxides + limestone + coke |
| C. | Hydrated iron oxides + dolomite + coke |
| D. | Iron pyrites + lime +bituminous coal |
| Answer» C. Hydrated iron oxides + dolomite + coke | |
| 953. |
Roasting of copper pyrites ores is for the following purposes |
| A. | To burn off sulphur, arsenic, antimony etc. as oxides and convert all the iron and copper to their oxides |
| B. | To burn off arsenic, antimony etc. as oxides and burn off sulphur so that enough of it remains to combine with all the copper |
| C. | To burn off sulphur partially to leave enough to combine with arsenic, antimony etc. and to convert all the iron and copper to oxides |
| D. | To melt arsenic and antimony sulphides etc. and remove them by liquation and to burn off sulphur partially to leave enough to combine with copper and iron |
| Answer» D. To melt arsenic and antimony sulphides etc. and remove them by liquation and to burn off sulphur partially to leave enough to combine with copper and iron | |
| 954. |
When a metal is to be extracted from its ore, if the gangue associated with the ore is silica, then [MP PET 1996] |
| A. | An acidic flux is needed |
| B. | A basic flux is needed |
| C. | Both acidic and basic flux are needed |
| D. | Neither of them is needed |
| Answer» C. Both acidic and basic flux are needed | |
| 955. |
Which of the following is slag [CPMT 1994] |
| A. | \[CaO\] |
| B. | \[CaS{{O}_{4}}\] |
| C. | \[CaSi{{O}_{3}}\] |
| D. | \[Si{{O}_{2}}\] |
| Answer» D. \[Si{{O}_{2}}\] | |
| 956. |
Calcination is used in metallurgy for removal of [AFMC 1995] |
| A. | Water and sulphide |
| B. | Water and \[C{{O}_{2}}\] |
| C. | \[C{{O}_{2}}\] and \[{{H}_{2}}S\] |
| D. | \[{{H}_{2}}O\] and \[{{H}_{2}}S\] |
| Answer» C. \[C{{O}_{2}}\] and \[{{H}_{2}}S\] | |
| 957. |
Which of the following metal is extracted by amalgamation process |
| A. | Tin |
| B. | Silver |
| C. | Copper |
| D. | Zinc |
| Answer» C. Copper | |
| 958. |
Complex is formed in the extraction of [MP PET 1989] |
| A. | \[Na\] |
| B. | \[Cu\] |
| C. | \[Ag\] |
| D. | \[Fe\] |
| Answer» D. \[Fe\] | |
| 959. |
In the manufacture of iron from haematite, the function of lime stone is as [CPMT 1988; MP PET 1991, 93, 95] |
| A. | A reducing agent |
| B. | Flux |
| C. | Slag |
| D. | Gangue |
| Answer» C. Slag | |
| 960. |
The smelting of iron in the blast furnace involves all the following process except |
| A. | Oxidation |
| B. | Reduction |
| C. | Decomposition |
| D. | Sublimation |
| Answer» E. | |
| 961. |
Flux added in the extraction of iron is |
| A. | Silica |
| B. | Felspar |
| C. | Limestone |
| D. | Flint |
| Answer» D. Flint | |
| 962. |
In the manufacture of iron lime stone added to the blast furnace, the calcium ion ends in the form of [MP PMT 1989; CPMT 1989; KCET 1993; IIT 1982; MADT Bihar 1995] |
| A. | Slag |
| B. | Gangue |
| C. | Calcium metal |
| D. | \[CaC{{O}_{3}}\] |
| Answer» B. Gangue | |
| 963. |
Which of the following processes involves smelting [NCERT 1983] |
| A. | \[ZnC{{O}_{3}}\to ZnO+C{{O}_{2}}\] |
| B. | \[F{{e}_{2}}{{O}_{3}}+3C\to 2Fe+3CO\] |
| C. | \[2PbS+3{{O}_{2}}\to 2PbO+2S{{O}_{2}}\] |
| D. | \[A{{l}_{2}}{{O}_{3}}.2{{H}_{2}}O\to A{{l}_{2}}{{O}_{3}}+2{{H}_{2}}O\] |
| Answer» C. \[2PbS+3{{O}_{2}}\to 2PbO+2S{{O}_{2}}\] | |
| 964. |
Reverberatory furnace is employed in the metallurgical process mainly for [MP PMT 1994] |
| A. | Reduction of oxide ores |
| B. | Smelting of sulphide ores |
| C. | Conversion of chloride to sulphate |
| D. | Getting magnetic materials |
| Answer» C. Conversion of chloride to sulphate | |
| 965. |
Smelting is termed to the process in which [MP PMT 1987] |
| A. | The ore is heated in the absence of air |
| B. | Ore is cold |
| C. | The ore is heated in the presence of air |
| D. | Ore is melted |
| Answer» E. | |
| 966. |
Main function of roasting is [MP PET/PMT 1988] |
| A. | To remove volatile substances |
| B. | Oxidation |
| C. | Reduction |
| D. | Slag formation |
| Answer» B. Oxidation | |
| 967. |
Calcination is the process of heating the ore [CPMT 1982] |
| A. | In a blast furnace |
| B. | In absence of air |
| C. | In presence of air |
| D. | None of these |
| Answer» C. In presence of air | |
| 968. |
The process of heating the ore strongly in excess of air so that the volatile impurities are removed and the ore is changed to oxide is known as [AMU 1985; NCERT 1990] |
| A. | Calcination |
| B. | Roasting |
| C. | Froth floatation |
| D. | Leaching |
| Answer» C. Froth floatation | |
| 969. |
Which of the following substance can be used for drying gases [EAMCET 1978; MP PET 1999] |
| A. | \[CaC{{O}_{3}}\] |
| B. | \[N{{a}_{2}}C{{O}_{3}}\] |
| C. | \[NaHC{{O}_{3}}\] |
| D. | \[CaO\] |
| Answer» E. | |
| 970. |
The cheap and having high melting point compound used in furnace is [CPMT 1975] |
| A. | \[PbO\] |
| B. | \[CaO\] |
| C. | \[HgO\] |
| D. | \[ZnO\] |
| Answer» C. \[HgO\] | |
| 971. |
The substance which is mixed with the ore for removal of impurities is termed as [MP PMT 1985, 87, 90; CPMT 1996; JIPMER 2002] |
| A. | Slag |
| B. | Gangue |
| C. | Flux |
| D. | Catalyst |
| Answer» D. Catalyst | |
| 972. |
In order to bring initial chemical change in the ore, the process of heating of ore below its melting point is known as |
| A. | Reduction |
| B. | Smelting |
| C. | Calcination |
| D. | Roasting |
| Answer» E. | |
| 973. |
Matte contains mainly [KCET 2000] |
| A. | \[C{{u}_{2}}S\]and \[FeS\] |
| B. | \[CuS\]and \[F{{e}_{2}}{{S}_{3}}\] |
| C. | \[Fe\] |
| D. | \[C{{u}_{2}}S\] |
| Answer» E. | |
| 974. |
Smelting is done in [DPMT 1979] |
| A. | Blast furnace |
| B. | Muffle furnace |
| C. | Open-hearth furnace |
| D. | Electric furnace |
| Answer» B. Muffle furnace | |
| 975. |
Amongst the following chemical reactions the irreversible reaction is [MP PMT 1999] |
| A. | \[{{H}_{2}}+{{I}_{2}}\] ⇌ \[HI\] |
| B. | \[AgN{{O}_{3}}+NaCl\]⇌\[AgCl+NaN{{O}_{3}}\] |
| C. | \[CaC{{O}_{3}}\] ⇌\[CaO+C{{O}_{2}}\] |
| D. | \[{{O}_{2}}+2S{{O}_{2}}\]⇌\[2S{{O}_{3}}\] |
| Answer» C. \[CaC{{O}_{3}}\] ⇌\[CaO+C{{O}_{2}}\] | |
| 976. |
All reactions which have chemical disintegration [MP PMT 1990] |
| A. | Is reversible |
| B. | Is reversible and endothermic |
| C. | Is exothermic |
| D. | Is reversible or irreversible and endothermic or exothermic |
| Answer» E. | |
| 977. |
Which of the following is a characteristic of a reversible reaction [AFMC 1993] |
| A. | Number of moles of reactants and products are equal |
| B. | It can be influenced by a catalyst |
| C. | It can never proceed to completion |
| D. | None of the above |
| Answer» D. None of the above | |
| 978. |
Which of the following reactions is reversible [MADT Bihar 1980] |
| A. | \[{{H}_{2}}+{{I}_{2}}\xrightarrow{{}}2HI\] |
| B. | \[{{H}_{2}}S{{O}_{4}}+Ba{{(OH)}_{2}}\xrightarrow{{}}BaS{{O}_{4}}+2{{H}_{2}}O\] |
| C. | \[NaCl+AgN{{O}_{3}}\xrightarrow{{}}NaN{{O}_{3}}+AgCl\] |
| D. | \[Fe+S\xrightarrow{{}}FeS\] |
| Answer» B. \[{{H}_{2}}S{{O}_{4}}+Ba{{(OH)}_{2}}\xrightarrow{{}}BaS{{O}_{4}}+2{{H}_{2}}O\] | |
| 979. |
In the given reaction \[{{N}_{2}}+{{O}_{2}}\]⇌\[2NO\], equilibrium means that [MADT Bihar 1984] |
| A. | Concentration of reactants is changing where as concentration of products is constant |
| B. | Concentration of all substances is constant |
| C. | Concentration of reactants is constant where as concentration of products is changing |
| D. | Concentration of all substances is changing |
| Answer» C. Concentration of reactants is constant where as concentration of products is changing | |
| 980. |
A reversible reaction is one which [MP PET 1986] |
| A. | Proceeds in one direction |
| B. | Proceeds in both directions |
| C. | Proceeds spontaneously |
| D. | All the statements are wrong |
| Answer» C. Proceeds spontaneously | |
| 981. |
The number of possible resonance structures for \[CO_{3}^{2-}\]is [MP PMT 2000] |
| A. | 2 |
| B. | 3 |
| C. | 6 |
| D. | 9 |
| Answer» C. 6 | |
| 982. |
The enolic form of acetone contains [IIT 1990; Bihar MEE 1997] |
| A. | 9 sigma bonds, 1 pi bond and 2 lone pairs |
| B. | 8 sigma bonds, 2 pi bonds and 2 lone pairs |
| C. | 10 sigma bonds, 1 pi bond and 1 lone pair |
| D. | 9 sigma bonds, 2 pi bonds and 1 lone pair |
| Answer» B. 8 sigma bonds, 2 pi bonds and 2 lone pairs | |
| 983. |
Which does not show resonance [CPMT 1990] |
| A. | Benzene |
| B. | Aniline |
| C. | Ethyl amine |
| D. | Toluene |
| Answer» D. Toluene | |
| 984. |
In the cyanide ion, the formal negative charge is on [AMU 1984] |
| A. | C |
| B. | N |
| C. | Both C and N |
| D. | Resonate between C and N |
| Answer» C. Both C and N | |
| 985. |
Resonating structures have different [AMU 1983] |
| A. | Atomic arrangements |
| B. | Electronic arrangements |
| C. | Functional groups |
| D. | Alkyl groups |
| Answer» C. Functional groups | |
| 986. |
Resonance is due to [NCERT 1981; Kurukshetra CEE 1998] |
| A. | Delocalization of sigma electrons |
| B. | Delocalization of pi electrons |
| C. | Migration of H atoms |
| D. | Migration of protons |
| Answer» C. Migration of H atoms | |
| 987. |
Which of the following molecule contains one pair of non-bonding electrons |
| A. | \[C{{H}_{4}}\] |
| B. | \[N{{H}_{3}}\] |
| C. | \[{{H}_{2}}O\] |
| D. | \[HF\] |
| Answer» C. \[{{H}_{2}}O\] | |
| 988. |
\[CO_{3}^{2-}\] anion has which of the following characteristics [Roorkee 1999] |
| A. | Bonds of unequal length |
| B. | \[s{{p}^{2}}\] hybridization of C atom |
| C. | Resonance stabilization |
| D. | Same bond angles |
| Answer» E. | |
| 989. |
Resonance hybrid of nitrate ion is [RPET 2000] |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» D. | |
| 990. |
Which one in the following is not the resonance structure of\[C{{O}_{2}}\] |
| A. | \[O=C=O\] |
| B. | \[^{-}O-C\equiv {{O}^{+}}\] |
| C. | \[^{+}O\equiv C-{{O}^{-}}\] |
| D. | \[O\equiv C=O\] |
| Answer» E. | |
| 991. |
Van Arkel method of purification of metals involves converting the metal to a [BHU 1990] |
| A. | Volatile stable compound |
| B. | Volatile unstable compound |
| C. | Nonvolatile stable compound |
| D. | None of the above |
| Answer» B. Volatile unstable compound | |
| 992. |
Zone refining is a method to obtain [KCET 1993] |
| A. | Very high temperature |
| B. | Ultra-pure Al |
| C. | Ultra-pure metals |
| D. | Ultra-pure oxides |
| Answer» D. Ultra-pure oxides | |
| 993. |
Of the following, which cannot be obtained by electrolysis of the aqueous solution of their salts [IIT 1990] |
| A. | \[Ag\] |
| B. | \[Mg\] and \[Al\] |
| C. | \[Cu\] |
| D. | \[Cr\] |
| Answer» C. \[Cu\] | |
| 994. |
The cyanide process is used for obtaining [DPMT 1982; CPMT 1976, 84, 90; MNR 1995; MP PET/PMT 1998; AIEEE 2002] |
| A. | \[Na\] |
| B. | \[Ag\] |
| C. | \[Cu\] |
| D. | \[Zn\] |
| Answer» C. \[Cu\] | |
| 995. |
Cupellation process is used in the metallugry of [CPMT 1983; MP PET 1994; MP PMT 2000, 02] |
| A. | Copper |
| B. | Silver |
| C. | Aluminium |
| D. | Iron |
| Answer» C. Aluminium | |
| 996. |
Metals are [MADT Bihar 1983] |
| A. | Electropositive |
| B. | Electronegative |
| C. | Acceptor of electrons |
| D. | None of these |
| Answer» B. Electronegative | |
| 997. |
Which method of purification is represented by the equation? \[\underset{\text{Impure}}{\mathop{Ti+2{{I}_{2}}}}\,\xrightarrow{500K}Ti{{I}_{4}}\xrightarrow{1675K}\underset{\text{Pure}}{\mathop{Ti+2{{I}_{2}}}}\,\] [AIIMS 1983] |
| A. | Cupellation |
| B. | Poling |
| C. | Van Arkel |
| D. | Zone refining |
| Answer» D. Zone refining | |
| 998. |
Gold is extracted by hydrometallurgical process based on its property [KCET 2005] |
| A. | Of being electropositive |
| B. | Of being less reactive |
| C. | To form complexes which are water soluble |
| D. | To form salts which are water soluble |
| Answer» D. To form salts which are water soluble | |
| 999. |
Zone refining is used for the purification of [Pune CET 1998] |
| A. | \[Cu\] |
| B. | \[Au\] |
| C. | \[Ge\] |
| D. | \[Ag\] |
| Answer» D. \[Ag\] | |
| 1000. |
Electric refining is used for refining of [DPMT 1996] |
| A. | Lead |
| B. | Copper |
| C. | Iron |
| D. | Sodium |
| Answer» C. Iron | |