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.
| 901. |
The amine that does not react with acetyl chloride is |
| A. | \[C{{H}_{3}}N{{H}_{2}}\] |
| B. | \[{{(C{{H}_{3}})}_{2}}NH\] |
| C. | \[{{(C{{H}_{3}})}_{3}}N\] |
| D. | None of these |
| Answer» D. None of these | |
| 902. |
In the reaction, \[C{{H}_{3}}CN+2H\xrightarrow{{}}X\xrightarrow{Boiling\,{{H}_{2}}O}\text{Y},\] the Term Y is |
| A. | acetone |
| B. | ethanamine |
| C. | acetaldehyde |
| D. | dimethylamine |
| Answer» D. dimethylamine | |
| 903. |
Which of the following reagents will be useful to distinguish between |
| A. | Dilute \[HCl\] |
| B. | \[{{C}_{6}}{{H}_{5}}S{{O}_{2}}\] and \[O{{H}^{+}}/{{H}_{2}}O\] |
| C. | \[HONO\] then \[\beta \]-naphthol |
| D. | \[AgN{{O}_{3}}\] in \[{{H}_{2}}O\] |
| Answer» D. \[AgN{{O}_{3}}\] in \[{{H}_{2}}O\] | |
| 904. |
Tautomerism will be exhibited by |
| A. | \[{{(C{{H}_{3}})}_{3}}CNO\] |
| B. | \[{{(C{{H}_{3}})}_{2}}NH\] |
| C. | \[{{R}_{3}}CN{{O}_{2}}\] |
| D. | \[RC{{H}_{2}}N{{O}_{2}}\] |
| Answer» E. | |
| 905. |
Hydrolysis of \[C{{H}_{2}}C{{H}_{2}}N{{O}_{2}}\] with 85% \[{{H}_{2}}S{{O}_{\text{4}}}\]gives |
| A. | \[C{{H}_{3}}C{{H}_{2}}OH\] |
| B. | \[{{C}_{2}}{{H}_{6}}\] |
| C. | \[C{{H}_{3}}CH=NOH\] |
| D. | \[C{{H}_{3}}COOH\] |
| Answer» E. | |
| 906. |
\[C{{H}_{3}}-C{{H}_{2}}C\equiv N\xrightarrow{X}C{{H}_{3}}C{{H}_{2}}CHO\]. The compound X is |
| A. | \[SnC{{l}_{2}}/HCl/{{H}_{2}}O,boil\] |
| B. | \[{{H}_{2}}/Pd-BaS{{O}_{4}}\] |
| C. | \[LiAI{{H}_{4}}/ether\] |
| D. | \[NaB{{H}_{4}}/ether/{{H}_{3}}{{O}^{+}}\] |
| Answer» B. \[{{H}_{2}}/Pd-BaS{{O}_{4}}\] | |
| 907. |
What will be the final product in the following reaction sequence? \[C{{H}_{3}}C{{H}_{2}}CN\xrightarrow{{{H}^{+}}/{{H}_{2}}O}A\xrightarrow[\Delta ]{N{{H}_{3}}}B\] \[\xrightarrow{NaOBr}C\] |
| A. | \[C{{H}_{3}}C{{H}_{2}}CON{{H}_{2}}\] |
| B. | \[C{{H}_{3}}C{{H}_{2}}COBr\] |
| C. | \[C{{H}_{3}}C{{H}_{2}}N{{H}_{2}}\] |
| D. | \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}N{{H}_{2}}\] |
| Answer» D. \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}N{{H}_{2}}\] | |
| 908. |
Consider the following sequence of reactions: \[Compound\left[ A \right]\xrightarrow{Reduction}\left[ B \right]\]\[\xrightarrow{HN{{O}_{2}}}C{{H}_{3}}C{{H}_{2}}OH\] The compound [A] is |
| A. | \[C{{H}_{3}}C{{H}_{2}}CN\] |
| B. | \[C{{H}_{3}}N{{O}_{2}}\] |
| C. | \[C{{H}_{3}}NC\] |
| D. | \[C{{H}_{3}}CN\] |
| Answer» E. | |
| 909. |
p-Chloroaniline and anilinium hydrogen chloride can be distinguished by: |
| A. | Sandmeyer reaction |
| B. | Carbyiamine reaction |
| C. | Hinsberg's reaction |
| D. | \[AgN{{O}_{3}}\] |
| Answer» E. | |
| 910. |
The conversion of benzene diazonium chloride to bromobenzene can be accomplished by |
| A. | Reimer-Tiemann reaction |
| B. | Friedel-Crafts reaction |
| C. | Gattermann reaction |
| D. | Azo-Coupling reaction |
| Answer» D. Azo-Coupling reaction | |
| 911. |
A composite solid propellant consists of |
| A. | Polyurethane or polybutadiene and ammonium perchlorate |
| B. | Nitroglycerine and nitrocellulose |
| C. | Hydrazine and \[{{N}_{2}}{{O}_{4}}\] |
| D. | Kerosene and liquid oxygen |
| Answer» B. Nitroglycerine and nitrocellulose | |
| 912. |
Thrust imparted to the rocket is governed by the |
| A. | Third law of thermodynamics |
| B. | Gravitational law |
| C. | Newton's third law |
| D. | None of these |
| Answer» D. None of these | |
| 913. |
The propellant in the proposed PSLV rocket of the Indian space programme shall consist of |
| A. | A composite solid propellant |
| B. | Biliquid propellants such as \[{{N}_{2}}{{O}_{4}}+\]unsymmetrical dimethyl hydrazine (UDMH) and \[{{N}_{2}}{{O}_{4}}\] monomethyl hydrazine (MMH) |
| C. | Both A and B in different stages of rocket propulsion |
| D. | Kerosene and liquid oxygen |
| Answer» D. Kerosene and liquid oxygen | |
| 914. |
A space rocket is propelled by |
| A. | An automobile engine |
| B. | Rocket propellant |
| C. | Nuclear submarine |
| D. | Steam engine |
| Answer» C. Nuclear submarine | |
| 915. |
Sodium alkyl benzene sulphonate is used as [MP PMT 2004] |
| A. | Soap |
| B. | Fertilizers |
| C. | Pesticides |
| D. | Detergents |
| Answer» E. | |
| 916. |
Pheromones are chemicals |
| A. | Formed by fermentation process of fungi |
| B. | Secreted by endocrine glands of man |
| C. | Secreted outside the body of insects |
| D. | Plant growth hormones |
| Answer» D. Plant growth hormones | |
| 917. |
Detergents are prepared by the action of \[{{H}_{2}}S{{O}_{4}}\] followed by neutralization by starting with [MP PMT 1990] |
| A. | Cholesterol |
| B. | Lauryl alcohol |
| C. | Cyclohexanol |
| D. | p-Nitrophenol |
| Answer» C. Cyclohexanol | |
| 918. |
A hybrid rocket propellant uses |
| A. | A liquid oxidizer and a solid fuel |
| B. | A composite solid propellant |
| C. | A biliquid propellant |
| D. | A solid, liquid and gas as a propellant |
| Answer» B. A composite solid propellant | |
| 919. |
One of the oxidants used with liquid propellants is [Kerala PMT 2001] |
| A. | Ammonium perchlorate |
| B. | Nitrocellulose |
| C. | Sulphuric acid |
| D. | Dinitrogen tetraoxide \[({{N}_{2}}{{O}_{4}})\] |
| E. | Phosphorus pentoxide |
| Answer» E. Phosphorus pentoxide | |
| 920. |
Which of the following is not used in rocket propellants |
| A. | \[{{H}_{2}}(l)\] |
| B. | \[{{O}_{2}}(l)\] |
| C. | Methane |
| D. | \[{{N}_{2}}{{H}_{4}}(l)\] |
| Answer» D. \[{{N}_{2}}{{H}_{4}}(l)\] | |
| 921. |
Which of the following is not used in nail polish |
| A. | Acetone |
| B. | Cellulose nitrate |
| C. | Red dye |
| D. | Benzene |
| Answer» E. | |
| 922. |
Structurally biodegradable detergent should contain [AIIMS 1994] |
| A. | Normal alkyl chain |
| B. | Branched alkyl chain |
| C. | Phenyl side chain |
| D. | Cyclohexyl side chain |
| Answer» C. Phenyl side chain | |
| 923. |
The chemical compounds released by one species of animals in order to influence the behaviour of the other members of the same species are called |
| A. | Pheromones |
| B. | Hormones |
| C. | Nucleic acid |
| D. | Steroids |
| Answer» B. Hormones | |
| 924. |
Which of the following is used as an oxidiser in rocket propellants |
| A. | Kerosene |
| B. | Nitric acid |
| C. | Liquid oxygen |
| D. | Liquid hydrogen |
| Answer» C. Liquid oxygen | |
| 925. |
A combination of nitrocellulose and nitroglycerine is a propellant of the type |
| A. | Hybrid propellant |
| B. | Mono propellant |
| C. | Double base propellant |
| D. | Biliquid propellant |
| Answer» D. Biliquid propellant | |
| 926. |
What type of a propellant is used in rocket SLV-3 which was fired by India |
| A. | Solid propellant |
| B. | Monomethy hydrazine + liquid \[{{N}_{2}}{{O}_{4}}\] |
| C. | Unsymmetrical dimethyl hydrazine liquid \[{{N}_{2}}{{O}_{4}}\] |
| D. | Liquid oxygen |
| Answer» B. Monomethy hydrazine + liquid \[{{N}_{2}}{{O}_{4}}\] | |
| 927. |
Which of the following represents a biliquid propellant |
| A. | Nitroglycerine + nitrocellulose |
| B. | \[{{N}_{2}}{{O}_{4}}+\]acrylic rubber |
| C. | \[{{N}_{2}}{{O}_{4}}\]+unsymmetrical dimethyl hydrazine |
| D. | None of these |
| Answer» D. None of these | |
| 928. |
A biliquid propellant contains |
| A. | Liquid hydrazine |
| B. | A mixture of liquid fuel and a liquid oxidizer |
| C. | A solid rocket fuel |
| D. | A liquid fuel which can also act as an oxidizer |
| Answer» B. A mixture of liquid fuel and a liquid oxidizer | |
| 929. |
Purpose of smelting of an ore is [MP PMT 1990, 2001; Kurukshetra CEE 1998; RPMT 2000] |
| A. | To oxidise it |
| B. | To reduce it |
| C. | To remove vaporisable impurities |
| D. | To obtain an alloy |
| Answer» C. To remove vaporisable impurities | |
| 930. |
Electric furnaces are lined with magnesia because |
| A. | It is not affected by acids |
| B. | It gives oxygen on heating |
| C. | It melts at very high temperature |
| D. | It has no effect of electricity |
| Answer» D. It has no effect of electricity | |
| 931. |
When lime stone is heated strongly, it gives off \[C{{O}_{2}}\]. In metallurgy this process is known as [MP PET/PMT 1988] |
| A. | Calcination |
| B. | Roasting |
| C. | Smelting |
| D. | Ore dressing |
| Answer» B. Roasting | |
| 932. |
The important step in the extraction of metal from carbonate ore is |
| A. | Calcination |
| B. | Roasting |
| C. | Electro-reduction |
| D. | Cupellation |
| Answer» B. Roasting | |
| 933. |
A substance which reacts with gangue to form fusible material is called [MP PMT 1990; Kurukshetra CEE 1998] |
| A. | Flux |
| B. | Catalyst |
| C. | Ore |
| D. | Slag |
| Answer» B. Catalyst | |
| 934. |
How is limestone used in Fe extraction [Orissa JEE 2004] |
| A. | Oxidation of Fe ore |
| B. | Reduction of Fe ore |
| C. | Formation of slag |
| D. | Purification of Fe formed |
| Answer» D. Purification of Fe formed | |
| 935. |
Heating mixture of \[C{{u}_{2}}O\] and \[C{{u}_{2}}S\] will give [AIEEE 2005] |
| A. | \[Cu+S{{O}_{2}}\] |
| B. | \[Cu+S{{O}_{3}}\] |
| C. | \[CuO+CuS\] |
| D. | \[C{{u}_{2}}S{{O}_{3}}\] |
| Answer» B. \[Cu+S{{O}_{3}}\] | |
| 936. |
Heating of ore in presence of air to remove sulphur impurities is called [AFMC 2005] |
| A. | Calcination |
| B. | Roasting |
| C. | Smelting |
| D. | None of these |
| Answer» C. Smelting | |
| 937. |
Inner layer of blast furnace is made of [MP PMT 1990] |
| A. | Graphite bricks |
| B. | Silica bricks |
| C. | Fire- clay bricks |
| D. | Basic bricks |
| Answer» D. Basic bricks | |
| 938. |
\[C{{N}^{-}}\]solution used in extraction of which metal [RPMT 2002] |
| A. | \[Ag\] |
| B. | \[Ti\] |
| C. | \[Zn\] |
| D. | \[Sn\] |
| Answer» B. \[Ti\] | |
| 939. |
Refractory metals are used in construction of furnaces because [CPMT 2002] |
| A. | They can withstand high temperature |
| B. | They are chemically inert |
| C. | Their melting point is high |
| D. | None of these |
| Answer» B. They are chemically inert | |
| 940. |
Which metal is used as a reducing agent in smelting [MP PET 2003] |
| A. | C |
| B. | Al |
| C. | Zn |
| D. | None of these |
| Answer» E. | |
| 941. |
Which of the following fluxes is used to remove acidic impurities in metallurgical process [KCET (Med.) 2001] |
| A. | Silica |
| B. | Lime stone |
| C. | Sodium chloride |
| D. | Sodium carbonate |
| Answer» C. Sodium chloride | |
| 942. |
Which is not basic flux [CPMT 1986] |
| A. | \[CaC{{O}_{3}}\] |
| B. | Lime |
| C. | \[Si{{O}_{2}}\] |
| D. | \[CaO\] |
| Answer» D. \[CaO\] | |
| 943. |
During extraction of \[Fe\]; slag obtained is [CPMT 2000] |
| A. | \[FeO\] |
| B. | \[FeSi{{O}_{3}}\] |
| C. | \[MgSi{{O}_{3}}\] |
| D. | \[CaSi{{O}_{3}}\] |
| Answer» E. | |
| 944. |
Roasting is done in [AFMC 2001] |
| A. | Blast furnace |
| B. | Open hearth furnace |
| C. | Electric furnace |
| D. | None of these |
| Answer» B. Open hearth furnace | |
| 945. |
The final step for the extraction of copper from copper pyrite in Bessemere converter involves the reaction [CPMT 2000] |
| A. | \[4C{{u}_{2}}O+FeS\to 8Cu+FeS{{O}_{4}}\] |
| B. | \[C{{u}_{2}}S+2C{{u}_{2}}O\to 6Cu+S{{O}_{2}}\] |
| C. | \[2C{{u}_{2}}O+FeS\to 4Cu+Fe+S{{O}_{2}}\] |
| D. | \[C{{u}_{2}}S+2FeO\to 2Cu+2FeCO+S{{O}_{2}}\] |
| Answer» C. \[2C{{u}_{2}}O+FeS\to 4Cu+Fe+S{{O}_{2}}\] | |
| 946. |
Flux is used to remove [AIIMS 1999] |
| A. | Acidic impurities |
| B. | Basic impurities |
| C. | All impurities from ores |
| D. | Both a and b |
| Answer» E. | |
| 947. |
A metal obtained directly by roasting of its sulphide ore is [Pune CET 1998] |
| A. | \[Cu\] |
| B. | \[Pb\] |
| C. | \[Hg\] |
| D. | \[Zn\] |
| Answer» D. \[Zn\] | |
| 948. |
The process of roasting of an ore is carried out in the [BHU 1999] |
| A. | Absence of air |
| B. | Presence of air |
| C. | Limited supply of air |
| D. | None of these |
| Answer» C. Limited supply of air | |
| 949. |
In blast furnace, the highest temperature is in [KCET 1998] |
| A. | Reduction zone |
| B. | Slag zone |
| C. | Fusion zone |
| D. | Combustion zone |
| Answer» E. | |
| 950. |
Which of the following ores is subjected to roasting during metallurgical operations for getting the metal oxide |
| A. | Horn silver |
| B. | Zinc blende |
| C. | Malachite |
| D. | Limonite |
| Answer» C. Malachite | |