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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.
| 9951. |
Correct order of increasing activity is |
| A. | \[Cu,\] \[Mg,\] \[Na\] |
| B. | \[Na,\] \[Mg,\] \[Cu\] |
| C. | \[Mg,\] \[Na,\] \[Cu\] |
| D. | \[Cu,\] \[Na,\] \[Mg\] |
| Answer» B. \[Na,\] \[Mg,\] \[Cu\] | |
| 9952. |
The order of appearance of the following with rising temperature during the refining of crude oil is [MNR 1993; UPSEAT 2002] |
| A. | Kerosene oil, gasoline, diesel |
| B. | Diesel, gasoline, kerosene oil |
| C. | Gasoline, diesel, kerosene oil |
| D. | Gasoline, kerosene oil, diesel |
| Answer» E. | |
| 9953. |
General formula of alkene and alkane are [MP PMT 2002] |
| A. | \[{{C}_{n}}{{H}_{2n}}\text{and}\,{{\text{C}}_{\text{n}}}{{H}_{2n+1}}\] |
| B. | \[{{C}_{n}}{{H}_{2n\,}}\text{and}\,\,{{\text{C}}_{\text{n}}}{{H}_{2n+2}}\] |
| C. | \[{{C}_{n}}{{H}_{2n-1}}\text{and}\,\,{{\text{C}}_{\text{n}}}{{H}_{2n}}\] |
| D. | \[{{C}_{n}}{{H}_{2n-1}}\text{and}\,\,{{\text{C}}_{\text{n}}}{{H}_{2n+2}}\] |
| Answer» C. \[{{C}_{n}}{{H}_{2n-1}}\text{and}\,\,{{\text{C}}_{\text{n}}}{{H}_{2n}}\] | |
| 9954. |
General formula of alkanes is [MP PET/PMT 2002] |
| A. | \[{{C}_{n}}{{H}_{2n+1}}\] |
| B. | \[{{C}_{n}}{{H}_{2n+2}}\] |
| C. | \[{{C}_{n}}{{H}_{2n-1}}\] |
| D. | \[{{C}_{n}}{{H}_{2n}}\] |
| Answer» C. \[{{C}_{n}}{{H}_{2n-1}}\] | |
| 9955. |
Haemoglobin contains 0.33% of iron by weight. The molecular weight of haemoglobin is approximately 67200. The number of iron atoms (At. wt. of Fe = 56) present in one molecule of haemoglobin is [CBSE PMT 1998] |
| A. | 6 |
| B. | 1 |
| C. | 4 |
| D. | 2 |
| Answer» D. 2 | |
| 9956. |
Which gas is used in excess water [BVP 2003] |
| A. | \[C{{O}_{2}}\] |
| B. | \[S{{O}_{2}}\] |
| C. | CO |
| D. | Water vapours |
| Answer» B. \[S{{O}_{2}}\] | |
| 9957. |
Identify the correct statement regarding entropy [CBSE PMT 1998; BHU 2001] |
| A. | At \[{{0}^{o}}C\], the entropy of a perfectly crystalline substance is taken to be zero |
| B. | At absolute zero of temperature, the entropy of a perfectly crystalline substance is \[+ve\] |
| C. | At absolute zero of temperature, the entropy of all crystalline substances is taken to be zero |
| D. | At absolute zero of temperature, the entropy of a perfectly crystalline substance is taken to be zero |
| Answer» E. | |
| 9958. |
Carbon-14 dating method is based on the fact that [CBSE 1997] |
| A. | Carbon-14 fraction is the same in all objects |
| B. | Carbon-14 is highly insoluble |
| C. | Ratio of carbon-14 and carbon-12 is constant |
| D. | All of these |
| Answer» D. All of these | |
| 9959. |
Aluminium hydroxide is soluble in excess of sodium hydroxide forming the ion [AMU 2001] |
| A. | \[Be{{(OH)}_{2}}\] |
| B. | \[AlO_{2}^{-3}\] |
| C. | \[AlO_{2}^{-}\] |
| D. | \[AlO_{3}^{-}\] |
| Answer» D. \[AlO_{3}^{-}\] | |
| 9960. |
Which of the following react with \[KMn{{O}_{4}}\] but does not react with \[AgN{{O}_{3}}\]? [BCECE 2005] |
| A. | \[{{C}_{2}}{{H}_{6}}\] |
| B. | \[C{{H}_{4}}\] |
| C. | \[{{C}_{2}}{{H}_{4}}\] |
| D. | \[{{C}_{2}}{{H}_{2}}\] |
| Answer» D. \[{{C}_{2}}{{H}_{2}}\] | |
| 9961. |
Which of the following cuts ultraviolet rays [AFMC 2004] |
| A. | Soda glass |
| B. | Crooke's glass |
| C. | Pyrax |
| D. | None of these |
| Answer» C. Pyrax | |
| 9962. |
The solubility of \[AgI\] in \[NaI\] solution is less than that in pure water because [UPSEAT 2001] |
| A. | AgI forms complex with NaI |
| B. | Of common ion effect |
| C. | Solubility product of AgI is less than that of NaI |
| D. | The temperature of the solution decreases |
| Answer» C. Solubility product of AgI is less than that of NaI | |
| 9963. |
The total internal energy change for a reversible isothermal cycles is |
| A. | Always 100 calories per degree |
| B. | Always negative |
| C. | 0 |
| D. | Always positive |
| Answer» D. Always positive | |
| 9964. |
A cell from the following which converts electrical energy into chemical energy |
| A. | Dry cell |
| B. | Electrochemical cell |
| C. | Electrolytic cell |
| D. | None of these |
| Answer» D. None of these | |
| 9965. |
In a saturated solution of electrolyte, the ionic product of their concentration are constant at constant temperature and this constant for electrolyte is known as [CPMT 1983] |
| A. | Ionic product |
| B. | Solubility product |
| C. | Ionization constant |
| D. | Dissociation constant |
| Answer» C. Ionization constant | |
| 9966. |
The vapour density of a gas is 11.2. The volume occupied by 11.2 g of the gas at ATP will be [Bihar CET 1995] |
| A. | 11.2 L |
| B. | 22.4 L |
| C. | 1 L |
| D. | 44.8 L |
| Answer» B. 22.4 L | |
| 9967. |
Which of the following statements is not applicable to chemisorption [KCET (Med.) 1999; BHU 2000] |
| A. | It is slow |
| B. | It is irreversible |
| C. | It is highly specific |
| D. | It is independent of temperature |
| Answer» E. | |
| 9968. |
Which one is an example of multimolecular colloid system |
| A. | Soap dispersed in water |
| B. | Protein dispersed in water |
| C. | Gold dispersed in water |
| D. | Gum dispersed in water |
| Answer» D. Gum dispersed in water | |
| 9969. |
The IUPAC name of the compound \[C{{H}_{3}}-\underset{C{{H}_{3}}\,}{\mathop{\underset{|\,\,\,\,\,\,\,}{\mathop{CH-}}\,}}\,C{{H}_{2}}-C{{H}_{2}}-Cl\] is [MP PET 1999; MH CET 2001] |
| A. | 1-chloro-3-methylbutane |
| B. | 2-methyl-4-chlorobutane |
| C. | 2-methyl-1-chlorobutane |
| D. | 1-chloropentane |
| Answer» D. 1-chloropentane | |
| 9970. |
Which alkali metal carbonate decomposes on heating to liberate \[C{{O}_{2}}\] gas [Pb. PMT 2000] |
| A. | \[L{{i}_{2}}C{{O}_{3}}\] |
| B. | \[CaC{{O}_{3}}\] |
| C. | \[N{{a}_{2}}C{{O}_{3}}\] |
| D. | \[A{{l}_{2}}C{{O}_{3}}\] |
| Answer» B. \[CaC{{O}_{3}}\] | |
| 9971. |
Which halide of nitrogen is least basic [DPMT 2001] |
| A. | \[NB{{r}_{3}}\] |
| B. | \[N{{I}_{3}}\] |
| C. | \[NC{{l}_{3}}\] |
| D. | \[N{{F}_{3}}\] |
| Answer» C. \[NC{{l}_{3}}\] | |
| 9972. |
Spiegeleisen is an alloy of |
| A. | Fe, C and Mn |
| B. | Fe, Mg and C |
| C. | Fe, Co and Cr |
| D. | Fe, Cu and Ni |
| Answer» B. Fe, Mg and C | |
| 9973. |
Ethylene reacts with ozone to give [DPMT 1981] |
| A. | Formaldehyde |
| B. | Ethyl alcohol |
| C. | Ozonide |
| D. | Acetaldehyde |
| Answer» B. Ethyl alcohol | |
| 9974. |
In which of the following salt hydrolysis takes place [CPMT 1974, 78] |
| A. | \[KCl\] |
| B. | \[NaN{{O}_{3}}\] |
| C. | \[C{{H}_{3}}COOK\] |
| D. | \[{{K}_{2}}S{{O}_{4}}\] |
| Answer» D. \[{{K}_{2}}S{{O}_{4}}\] | |
| 9975. |
Oils and fats are obtained by saponification of potassium stearate. Its formula is \[C{{H}_{3}}-{{(C{{H}_{2}})}_{16}}-CO{{O}^{-}}{{K}^{+}}\]. Lyophobic end of atom is \[(C{{H}_{3}})\] and lyophilic end is \[CO{{O}^{-}}{{K}^{+}}\]. potassium stearate is example of [Kerala CET 2005] |
| A. | Lyophobic colloids |
| B. | Lyophilic colloids |
| C. | Poly molecular colloids |
| D. | Macromolecular colloids |
| E. | Combined colloids or Miscells |
| Answer» F. | |
| 9976. |
An aqueous solution of potash alum gives [UPSEAT 2004] |
| A. | Two types of ions |
| B. | Only one type of ion |
| C. | Four types of ions |
| D. | Three types of ions |
| Answer» E. | |
| 9977. |
The entropy values (in JK-1 mol-1) of H2(g) = 130.6, Cl2(g) = 223.0 and HCl(g) = 186.7 at 298 K and 1 atm pressure. Then entropy change for the reaction \[{{H}_{2(g)}}+C{{l}_{2(g)}}\to 2HC{{l}_{(g)}}\] is [BHU 2005] |
| A. | + 540.3 |
| B. | + 727.3 |
| C. | ? 166.9 |
| D. | + 19.8 |
| Answer» E. | |
| 9978. |
The occurrence of a reaction is impossible if [AIIMS 1982, 91; MP PET 1997; MP PMT 1999; DPMT 2002] |
| A. | \[\Delta H\] is +ve ; \[\Delta S\] is also + ve but \[\Delta H<T\Delta S\] |
| B. | \[\Delta H\] is ? ve ; \[\Delta S\] is also ? ve but \[\Delta H\,>\,T\Delta S\] |
| C. | \[\Delta H\] is ? ve ; \[\Delta S\] is + ve |
| D. | \[\Delta H\] is + ve ; \[\Delta S\] is ? ve |
| Answer» E. | |
| 9979. |
Energy of orbit [DPMT 1984, 91] |
| A. | Increases as we move away from nucleus |
| B. | Decreases as we move away from nucleus |
| C. | Remains same as we move away from nucleus |
| D. | None of these |
| Answer» B. Decreases as we move away from nucleus | |
| 9980. |
Which of the following compounds represents acrylonitrile [JIPMER 1997] |
| A. | Vinyl cyanide |
| B. | Cyanoethene |
| C. | Prop-2-ene nitrile |
| D. | All of them |
| Answer» E. | |
| 9981. |
For the fission reaction \[_{92}{{U}^{235}}+{{\,}_{0}}{{n}^{1}}\to {{\,}_{56}}B{{a}^{140}}+{{\,}_{y}}{{E}^{x}}+2{{\,}_{0}}{{n}^{1}}\] The value of \[x\] and \[y\] will be |
| A. | \[x=93\] and \[y=34\] |
| B. | \[x=92\] and \[y=35\] |
| C. | \[x=89\] and \[y=44\] |
| D. | \[x=94\] and \[y=36\] |
| Answer» E. | |
| 9982. |
The stability of lyophilic colloidal sol is due to |
| A. | Both charge and solvation |
| B. | Only solvation |
| C. | Only charge |
| D. | None of these |
| Answer» B. Only solvation | |
| 9983. |
When a \[\beta \]-particle emits from the atom of an element, then [MP PET 1990] |
| A. | Atomic number increases by two units |
| B. | Atomic number increases by three units |
| C. | Atomic number decreases by one unit |
| D. | Atomic number increases by one unit |
| Answer» E. | |
| 9984. |
Heating of alkanes with fuming sulphuric acid or oleum at high temperature, which forms sulphonic acid, is called [MH CET 1999] |
| A. | Nitration |
| B. | Halogenation |
| C. | Sulphonation |
| D. | Oxidation |
| Answer» D. Oxidation | |
| 9985. |
Sulphur forms the chlorides\[{{S}_{2}}C{{l}_{2}}\text{ and }SC{{l}_{2}}\]. The equivalent mass of sulphur in \[SC{{l}_{2}}\]is [EAMCET 1985; Pb. CET 2001] |
| A. | 8 g/mole |
| B. | 16 g/mole |
| C. | 64.8 g/mole |
| D. | 32 g/mole |
| Answer» C. 64.8 g/mole | |
| 9986. |
In the adsorption of acetic acid on activated charcoal, the acetic acid is an [MP PET 1994; MP PMT 2002] |
| A. | Adsorber |
| B. | Absorber |
| C. | Adsorbent |
| D. | Adsorbate |
| Answer» E. | |
| 9987. |
The coordination number of a metal in coordination compounds is [MP PET 1996; KCET (Engg./Med.) 1999] |
| A. | Same as primary valency |
| B. | Sum of primary and secondary valencies |
| C. | Same as secondary valency |
| D. | None of these |
| Answer» D. None of these | |
| 9988. |
In fructose, the possible optical isomers are [Orissa JEE 2005] |
| A. | 12 |
| B. | 8 |
| C. | 16 |
| D. | 4 |
| Answer» C. 16 | |
| 9989. |
When ethene reacts with bromine, it forms [AFMC 2000; KCET 2001] |
| A. | Chloroethane |
| B. | Ethylene dibromide |
| C. | 1 bromopropane |
| D. | 1,2-dichloroethene |
| Answer» C. 1 bromopropane | |
| 9990. |
In Balmer series of hydrogen atom spectrum which electronic transition causes third line [MP PMT 2000] |
| A. | Fifth Bohr orbit to second one |
| B. | Fifth Bohr orbit to first one |
| C. | Fourth Bohr orbit to second one |
| D. | Fourth Bohr orbit to first one |
| Answer» B. Fifth Bohr orbit to first one | |
| 9991. |
If a compound on analysis was found to contain C = 18.5%, H = 1.55%, Cl = 55.04% and O = 24.81%, then its empirical formula is [AIIMS 1998] |
| A. | \[CHClO\] |
| B. | \[C{{H}_{2}}ClO\] |
| C. | \[{{C}_{2}}{{H}_{2}}OCl\] |
| D. | \[ClC{{H}_{2}}O\] |
| Answer» B. \[C{{H}_{2}}ClO\] | |
| 9992. |
An organic compound containing C, H and N gave following analysis : C = 40%, H = 13.33% and N = 46.67%. Its empirical formula would be [CBSE PMT 1998, 99; AFMC 2000; KCET 2002; Pb. PMT 2004] |
| A. | \[{{C}_{2}}{{H}_{7}}{{N}_{2}}\] |
| B. | \[C{{H}_{5}}N\] |
| C. | \[C{{H}_{4}}N\] |
| D. | \[{{C}_{2}}{{H}_{7}}N\] |
| Answer» D. \[{{C}_{2}}{{H}_{7}}N\] | |
| 9993. |
The atomic number of an element is 11. Its oxide will be [MP PMT 1996] |
| A. | Acidic |
| B. | Basic |
| C. | Acid and basic both |
| D. | Neutral |
| Answer» C. Acid and basic both | |
| 9994. |
Alkali metals are [MP PMT 1996] |
| A. | Li, Na, Be, Mg, Cs |
| B. | Li, Na, K, Rb, Cs |
| C. | Na, K, Mg, Ca, Rb |
| D. | K, Rb, Cs, Ba, Sr |
| Answer» C. Na, K, Mg, Ca, Rb | |
| 9995. |
The valence shell electronic configuration of alkali metals is [MP PET 1996; UPSEAT 2001] |
| A. | \[n{{s}^{2}}n{{p}^{1}}\] |
| B. | \[n{{s}^{1}}\] |
| C. | \[(n-1){{p}^{6}}n{{s}^{2}}\] |
| D. | \[(n-1){{d}^{2}}n{{s}^{2}}\] |
| Answer» C. \[(n-1){{p}^{6}}n{{s}^{2}}\] | |
| 9996. |
Which of the following is a colligative property [AFMC 1992; CBSE PMT 1992; MP PMT 1996, 2003] |
| A. | Osmotic pressure |
| B. | Boiling point |
| C. | Vapour pressure |
| D. | Freezing point |
| Answer» B. Boiling point | |
| 9997. |
IUPAC name of the compound is \[C{{H}_{3}}-\underset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,}{\mathop{\underset{C{{H}_{2}}}{\mathop{\underset{|\,\,\,\,\,}{\mathop{CH}}\,}}\,}}\,}}\,-C{{H}_{2}}-CH(OH)-C{{H}_{3}}\] is [DPMT 1985; MP PMT 1987; AFMC 1997] |
| A. | 4-ethyl-2-pentanol |
| B. | 4-methyl-2-hexanol |
| C. | 2-ethyl-2-pentanol |
| D. | 3-methyl-2-hexanol |
| Answer» C. 2-ethyl-2-pentanol | |
| 9998. |
Rutherford's scattering experiment is related to the size of the [IIT 1983; MADT Bihar 1995; BHU 1995] |
| A. | Nucleus |
| B. | Atom |
| C. | Electron |
| D. | Neutron |
| Answer» B. Atom | |
| 9999. |
Co-ordination number of aluminum is [MHCET 2004] |
| A. | 8 |
| B. | 6 |
| C. | 12 |
| D. | 4 |
| Answer» C. 12 | |
| 10000. |
Which one is false in the following statement [MP PET 1997] |
| A. | A catalyst is specific in its action |
| B. | A very small amount of the catalyst alters the rate of a reaction |
| C. | The number of free valencies on the surface of the catalyst increases on subdivision |
| D. | \[Ni\] is used as catalyst in the manufacture of ammonia |
| Answer» E. | |