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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.
| 10651. |
Blast furnace is employed in the smelting of oxide ore with coke and flux in the metallurgy of |
| A. | Iron |
| B. | Copper |
| C. | Lead |
| D. | All the above |
| Answer» E. | |
| 10652. |
Flux is used to remove [KCET (Med.) 2000; PCET 2004] |
| A. | Silica |
| B. | Metal oxide |
| C. | All impurities from ores |
| D. | Silica and undesirable metal oxide |
| Answer» E. | |
| 10653. |
Roasting involves |
| A. | Only volatilisation of volatile impurities |
| B. | Only volatilisation of volatile impurities and decomposition of the ore |
| C. | Volatilisation of volatile impurities and decomposition and oxidation of the ore |
| D. | Oxidation and reduction of the ore and slag formation |
| Answer» D. Oxidation and reduction of the ore and slag formation | |
| 10654. |
The impurties associated with minerals used in metallurgy are collectively called [MP PMT 1995; RPMT 1999] |
| A. | Slag |
| B. | Flux |
| C. | Gangue |
| D. | Ore |
| Answer» D. Ore | |
| 10655. |
The reaction \[2ZnS+3{{O}_{2}}\to 2ZnO+2S{{O}_{2}}\] in the metallurgical process of zinc is called [MP PET 1994] |
| A. | Calcination |
| B. | Cupellation |
| C. | Smelting |
| D. | Roasting |
| Answer» E. | |
| 10656. |
Roasting is generally done in case of the following [MP PMT 1985] |
| A. | Oxide ores |
| B. | Silicate ores |
| C. | Sulphide ores |
| D. | Carbonate ores |
| Answer» D. Carbonate ores | |
| 10657. |
In metallurgy, flux is a substance used to convert [EAMCET 1988] |
| A. | Infusible impurities to fusible material |
| B. | Soluble impurities to insoluble impurities |
| C. | Fusible impurities to infusible impurities |
| D. | Mineral into silicate |
| Answer» B. Soluble impurities to insoluble impurities | |
| 10658. |
Refractory materials are generally used in furnaces because [MNR 1980; MP PMT 1986] |
| A. | They possess great structural strength |
| B. | They can withstand high temperature |
| C. | They are chemically inert |
| D. | They do not require replacement |
| Answer» C. They are chemically inert | |
| 10659. |
Which one of the furnaces among the following can produce the highest temperature |
| A. | Muffle furnace |
| B. | Blast furnace |
| C. | Reverberatory furnace |
| D. | Electric furnace |
| Answer» E. | |
| 10660. |
In electrolytic refining, the impure metal is made is used to make [MP PET 2003] |
| A. | Cathode |
| B. | Anode |
| C. | Electrolytic bath |
| D. | None of these |
| Answer» C. Electrolytic bath | |
| 10661. |
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 | |
| 10662. |
Mond's process is used for preparing [MNR 1983] |
| A. | \[Ni\] |
| B. | \[{{H}_{2}}S{{O}_{4}}\] |
| C. | \[N{{H}_{3}}\] |
| D. | \[HN{{O}_{3}}\] |
| Answer» B. \[{{H}_{2}}S{{O}_{4}}\] | |
| 10663. |
The metal extracted by electrolysis of its fused salt is [MP PET/PMT 1998] |
| A. | Iron |
| B. | Lead |
| C. | Sodium |
| D. | Copper |
| Answer» D. Copper | |
| 10664. |
In order to refine 'blister copper' it is melted in a furnace and is stirred with green logs of wood. The purpose is [MP PET 1996] |
| A. | To expel the dissolved gases in blister copper |
| B. | To bring the impurities to surface and oxidize them |
| C. | To increase the carbon content of copper |
| D. | To reduce the metallic oxide impurities with hydrocarbon gases liberated from the wood |
| Answer» E. | |
| 10665. |
Thermite process is used to extract metals [KCET 1989] |
| A. | When their oxides can't be reduced by carbon |
| B. | When their carbonates do not yield oxides by thermal decomposition |
| C. | When their sulphides can't be converted into oxides by roasting |
| D. | When their melting points are very high |
| Answer» B. When their carbonates do not yield oxides by thermal decomposition | |
| 10666. |
General method for the extraction of metal from oxide ore is [CPMT 1983; MP PET 2002] |
| A. | Carbon reduction |
| B. | Reduction by aluminium |
| C. | Reduction by hydrogen |
| D. | Electrolytic reduction |
| Answer» B. Reduction by aluminium | |
| 10667. |
Which one of the following is used in the extraction of aluminium by electrolytic process [CPMT 1978] |
| A. | \[A{{l}_{2}}{{O}_{3}}\] |
| B. | \[Al{{(OH)}_{3}}\] |
| C. | \[AlC{{l}_{3}}\] |
| D. | \[A{{l}_{2}}{{(S{{O}_{4}})}_{3}}\] |
| Answer» B. \[Al{{(OH)}_{3}}\] | |
| 10668. |
Among the following groups of oxides, the group containing oxides that cannot be reduced by carbon to give the respective metals is [NCERT 1984] |
| A. | \[C{{u}_{2}}O,\,{{K}_{2}}O\] |
| B. | \[F{{e}_{2}}{{O}_{3}},\,ZnO\] |
| C. | \[CaO,\,{{K}_{2}}O\] |
| D. | \[PbO,\,F{{e}_{3}}{{O}_{4}}\] |
| Answer» D. \[PbO,\,F{{e}_{3}}{{O}_{4}}\] | |
| 10669. |
Which of the following statement is correct |
| A. | Bauxite is an ore of aluminium |
| B. | Magnetite is an ore of manganese |
| C. | Haematite is an ore of mercury |
| D. | Pyrites is an ore of phosphorus |
| Answer» B. Magnetite is an ore of manganese | |
| 10670. |
The most important ore of tin is [AFMC 2005] |
| A. | Cassiterite |
| B. | Cryolite |
| C. | Cerussite |
| D. | None of these |
| Answer» B. Cryolite | |
| 10671. |
The most abundant metal in the earth crust is [BHU 1979, 81; MP PMT 1997; CPMT 1988, 2001; CBSE PMT 2000] |
| A. | \[Na\] |
| B. | \[Mg\] |
| C. | \[Al\] |
| D. | \[Fe\] |
| Answer» D. \[Fe\] | |
| 10672. |
Which one of the following is correct [MP PET/PMT 2002] |
| A. | A mineral cannot be an ore |
| B. | An ore cannot be a mineral |
| C. | All minerals are ores |
| D. | All ores are minerals |
| Answer» E. | |
| 10673. |
Chile saltpetre is [MP PET 2004] |
| A. | \[NaN{{O}_{3}}\] |
| B. | \[KN{{O}_{3}}\] |
| C. | \[N{{a}_{2}}S{{O}_{4}}\] |
| D. | \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}\] |
| Answer» B. \[KN{{O}_{3}}\] | |
| 10674. |
Which one of the following is the most abundant element in the universe [NDA 1999] |
| A. | Nitrogen |
| B. | Hydrogen |
| C. | Oxygen |
| D. | Silicon |
| Answer» C. Oxygen | |
| 10675. |
Important ore of zinc is [CPMT 1973, 78, 80] |
| A. | Calamine |
| B. | Cryolite |
| C. | Gibsite |
| D. | Malachite |
| Answer» B. Cryolite | |
| 10676. |
Silicon is main constituent of [DPMT 1985] |
| A. | Alloys |
| B. | Rocks |
| C. | Animals |
| D. | Vegetables |
| Answer» C. Animals | |
| 10677. |
The formula of haematite is [MNR 1994] |
| A. | \[F{{e}_{3}}{{O}_{4}}\] |
| B. | \[F{{e}_{2}}{{O}_{3}}\] |
| C. | \[FeC{{O}_{3}}\] |
| D. | \[Fe{{S}_{2}}\] |
| Answer» C. \[FeC{{O}_{3}}\] | |
| 10678. |
Corundum is [CPMT 1975, 76; DPMT 1983] |
| A. | \[Sr{{O}_{2}}\] |
| B. | \[A{{l}_{2}}{{O}_{3}}\] |
| C. | \[CaC{{l}_{2}}\] |
| D. | \[C{{u}_{2}}C{{l}_{2}}\] |
| Answer» C. \[CaC{{l}_{2}}\] | |
| 10679. |
Which of the following substances consists of only one element [MP PET 1999, 2000] |
| A. | Marble |
| B. | Sand |
| C. | Diamond |
| D. | Glass |
| Answer» D. Glass | |
| 10680. |
The salt which is least likely to be found in minerals is [DPMT 1984] |
| A. | Chloride |
| B. | Sulphate |
| C. | Sulphide |
| D. | Nitrate |
| Answer» E. | |
| 10681. |
\[{{D}_{2}}O\] is used more in [BHU 1997; CPMT 1997] |
| A. | Chemical industry |
| B. | Nuclear reactor |
| C. | Pharmaceutical preparations |
| D. | Insecticide preparation |
| Answer» C. Pharmaceutical preparations | |
| 10682. |
Synthetic detergents are more effective in hard water than soaps because [AMU 2002] |
| A. | They are highly soluble in water |
| B. | Their \[C{{a}^{++}}\] and \[M{{g}^{++}}\] salts are water soluble |
| C. | Their \[C{{a}^{++}}\] and \[M{{g}^{++}}\] salts are insoluble in water |
| D. | None of these |
| Answer» C. Their \[C{{a}^{++}}\] and \[M{{g}^{++}}\] salts are insoluble in water | |
| 10683. |
Which of the following will cause softening of hard water |
| A. | Passing it through cation exchange resin |
| B. | Passing it through anion exchange resin |
| C. | Passing it through sand |
| D. | Passing it through alumina |
| Answer» B. Passing it through anion exchange resin | |
| 10684. |
which of the following process permanent hardness of water can be removed, by adding [AFMC 2005] |
| A. | Sodalime |
| B. | Sodiumbicarbonate |
| C. | Washing soda |
| D. | Sodium chloride |
| Answer» D. Sodium chloride | |
| 10685. |
Permutit is technical name given to |
| A. | Aluminates of calcium and sodium |
| B. | Silicates of calcium and sodium |
| C. | Hydrated silicates of aluminium and sodium |
| D. | Silicates of calcium and magnesium |
| Answer» D. Silicates of calcium and magnesium | |
| 10686. |
Which of the following metal will not reduce \[{{H}_{2}}O\] [CPMT 1999] |
| A. | Ca |
| B. | Fe |
| C. | Cu |
| D. | Li |
| Answer» D. Li | |
| 10687. |
Which of the following is correct about heavy water [DCE 2002] |
| A. | Water at 4°C having maximum density is known as heavy water |
| B. | It is heavier than water \[({{H}_{2}}O)\] |
| C. | It is formed by the combination of heavier isotope of hydrogen and oxygen |
| D. | None of these |
| Answer» D. None of these | |
| 10688. |
The boiling point of water is exceptionally high because [KCET 2001] |
| A. | There is covalent bond between H and O |
| B. | Water molecule is linear |
| C. | Water molecules associate due to hydrogen bonding |
| D. | Water molecule is not linear |
| Answer» D. Water molecule is not linear | |
| 10689. |
Action of water or dilute mineral acids on metals can give [Kerala PMT 2002] |
| A. | Monohydrogen |
| B. | Tritium |
| C. | Dihydrogen |
| D. | Trihydrogen |
| Answer» D. Trihydrogen | |
| 10690. |
Metal which does not react with cold water but evolves \[{{H}_{2}}\] with steam is [DCE 2002] |
| A. | Na |
| B. | K |
| C. | Pt |
| D. | Fe |
| Answer» E. | |
| 10691. |
pH of neutral water at room temperature nearly |
| A. | 0 |
| B. | 14 |
| C. | 7 |
| D. | \[{{10}^{-7}}\] |
| Answer» D. \[{{10}^{-7}}\] | |
| 10692. |
Temporary hardness of water can be removed by [Pb. PMT 2001] |
| A. | Addition of potassium permagenate |
| B. | Boiling |
| C. | Filtration |
| D. | Addition of chlorine |
| Answer» C. Filtration | |
| 10693. |
When zeolite (Hydrated sodium aluminium silicate) is treated with hard water the sodium ions are exchanged with [DPMT 2000] |
| A. | \[O{{H}^{-}}\] ions |
| B. | \[SO_{4}^{2-}\] ions |
| C. | \[C{{a}^{2+}}\] ions |
| D. | \[{{H}^{+}}\] ions |
| Answer» D. \[{{H}^{+}}\] ions | |
| 10694. |
Which of the following statements do not define the characteristic property of water? Water is a universal solvent? |
| A. | It can dissolve maximum number of compounds |
| B. | It has very low dielectric constant |
| C. | It has high liquid range |
| D. | None of these |
| Answer» C. It has high liquid range | |
| 10695. |
The amount of \[{{H}_{2}}{{O}_{2}}\] present in 1 L of 1.5 \[N{{H}_{2}}{{O}_{2}}\] solution is |
| A. | 2.5 g |
| B. | 25.5 g |
| C. | 3.0 g |
| D. | 8.0 g |
| Answer» C. 3.0 g | |
| 10696. |
Deuteroammonia (\[N{{D}_{3}}\]) can be prepared |
| A. | by heating a solution of \[N{{H}_{4}}Cl\]in NaOD. |
| B. | by action of heavy water on magnesium nitride. |
| C. | by fractionation of ordinary ammonia. |
| D. | none of the above |
| Answer» C. by fractionation of ordinary ammonia. | |
| 10697. |
Hydrogen molecule differs from chlorine molecule in the following respect |
| A. | Hydrogen molecule is non-polar but chlorine molecule is polar |
| B. | Hydrogen molecule is polar while chlorine molecule is non-polar |
| C. | Hydrogen molecule can form intermolecular hydrogen bonds but chlorine molecule does not |
| D. | Hydrogen molecule cannot participate in coordination bond formation but chlorine molecule can |
| Answer» E. | |
| 10698. |
In all its properties, hydrogen resembles |
| A. | Alkali metals only |
| B. | Halogen only |
| C. | Both alkali metals and halogens |
| D. | Neither alkali metals nor halogens |
| Answer» D. Neither alkali metals nor halogens | |
| 10699. |
Protonic acid is |
| A. | A compound that form solvated hydrogen ion in polar solvent |
| B. | An acid which accepts the proton |
| C. | A compound that forms hydride ion in polar solvent |
| D. | An acid which donates the proton |
| Answer» B. An acid which accepts the proton | |
| 10700. |
Which of the following statements concerning protium, deuterium and tritium is not true |
| A. | They are isotopes of each other |
| B. | They have similar electronic configurations |
| C. | They exist in the nature in the ratio of 1 : 2 : 3 |
| D. | Their mass numbers are in the ratio of 1 : 2 : 3 |
| Answer» D. Their mass numbers are in the ratio of 1 : 2 : 3 | |