Explore topic-wise MCQs in Joint Entrance Exam - Main (JEE Main).

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.

10801.

Which compound is chiral [RPMT 2002]

A. butane
B. 1-chloro-2-methyl butane
C. 2-methyl butane
D. 2-methyl propane
Answer» C. 2-methyl butane
10802.

\[\underset{H}{\overset{{{H}_{3}}C}{\mathop{{}}}}\,>C=C<\underset{H}{\overset{C{{H}_{3}}}{\mathop{{}}}}\,\] and \[\begin{matrix} {{H}_{3}}C & {} & H \\ {} & >C=C< & {} \\ \,\,\,\,H & {} & C{{H}_{3}} \\ \end{matrix}\]exhibit which isomerism [MP PET 2002]

A. Position isomerism
B. Geometrical isomerism
C. Optical isomerism
D. Functional isomerism
Answer» C. Optical isomerism
10803.

Which of the following does not show geometrical isomerism [AIEEE 2002]

A. 1, 2 dichloro-1-pentene
B. 1, 3-dichloro-2-pentene
C. 1, 1-dichloro-1-pentene
D. 1, 4-dichloro-2-pentene
Answer» D. 1, 4-dichloro-2-pentene
10804.

Which of the following can?t be used in Friedal Craft?s reactions [AFMC 2004]

A. \[FeC{{l}_{3}}\]
B. \[FeB{{r}_{2}}\]
C. \[AlC{{l}_{3}}\]
D. NaCl
Answer» E.
10805.

The function of \[AlC{{l}_{3}}\] in Friedel-Craft?s reaction is [KCET 2003]

A. To absorb HCl
B. To absorb water
C. To produce nucleophile
D. To produce electrophile
Answer» E.
10806.

The most common type of reaction in aromatic compounds is [Orissa JEE 2003]

A. Elimination reaction
B. Addition reaction
C. Electrophilic substitution reaction
D. Rearrangement reaction
Answer» D. Rearrangement reaction
10807.

Among the following the strongest nucleophile is [AIIMS 2005]

A. \[{{C}_{2}}{{H}_{5}}SH\]
B. \[C{{H}_{3}}CO{{O}^{-}}\]
C. \[C{{H}_{3}}N{{H}_{2}}\]
D. \[NCCH_{2}^{-}\]
Answer» B. \[C{{H}_{3}}CO{{O}^{-}}\]
10808.

Which one of the following is least reactive in a nucleophilic substitution reaction [CBSE PMT 2004]

A. \[C{{H}_{3}}C{{H}_{2}}Cl\]
B. \[C{{H}_{2}}=CHC{{H}_{2}}Cl\]
C. \[{{(C{{H}_{3}})}_{3}}C-Cl\]
D. \[C{{H}_{2}}=CHCl\]
Answer» E.
10809.

Which is an electrophile [DCE 2002]

A. \[BC{{l}_{3}}\]
B. \[C{{H}_{3}}OH\]
C. \[N{{H}_{3}}\]
D. \[AlCl_{4}^{-}\]
Answer» B. \[C{{H}_{3}}OH\]
10810.

Following reaction, \[{{(C{{H}_{3}})}_{3}}CBr+{{H}_{2}}O\to {{(C{{H}_{3}})}_{3}}COH+HBr\] is an example of [DCE 2002]

A. Elimination reaction
B. Free radical substitution
C. Nucleophilic substitution
D. Electrophilic substitution
Answer» D. Electrophilic substitution
10811.

Conversion of \[C{{H}_{4}}\] to \[C{{H}_{3}}Cl\] is an example of which of the following reaction [Pb. CET 2001]

A. Electrophilic substitution
B. Free radical addition
C. Nucleophilic substitution
D. Free radical substituion
Answer» E.
10812.

The optically active tartaric acid is named as D-(+)- tartaric acid because it has a positive [IIT-JEE 1999]

A. Optical rotation and is derived from D-glucose
B. pH in organic solvent
C. Optical rotation and is derived from D(+) glyceraldehyde
D. Optical rotation only when substituted by deuterium
Answer» D. Optical rotation only when substituted by deuterium
10813.

Of the following acids I. Hypophosphorous acid II. Orthophosphorous acid III. Caro's acid IV. Glycine

A. I, II monobasic; III dibasic acid and IV amphoteric
B. II monobasic; I, III dibasic acid and IV amphoteric
C. I monobasic; II, III dibasic acid and IV amphoteric
D. I, II, III dibasic acids and IV amphoteric
Answer» D. I, II, III dibasic acids and IV amphoteric
10814.

Select the best indicator from the given table for titration of 20 mL of \[0.02\,M\,\,C{{H}_{3}}COOH\] with 0.02 M NaOH. Given \[p{{K}_{a}}\,(C{{H}_{3}}COOH)=4.74\] Indicator pH Range (I) Bromothy mol blue 6.0-7.6 (II) Thymolphthalein 9.3-11.05 (III) Malachite green 11.4-13 (IV) M-Cresol purple 7.4-9.0

A. I
B. II
C. III
D. IV
Answer» E.
10815.

Equal volumes of two HCl solutions of \[pH=3\] and were mixed. What is the pH of the resulting solution?

A. 3.5
B. 4
C. 4.5
D. 3.3
Answer» E.
10816.

The ionization constant of \[HCOOH\] is \[1.8\times {{10}^{-4}}\]. What is the percent ionization of a 0.001 M solution?

A. 0.66
B. 0.42
C. 0.34
D. 0.58
Answer» D. 0.58
10817.

The solubility product of \[Mg{{(OH)}_{2}}\] is \[{{10}^{-14}}\]. The solubility of \[Mg{{(OH)}_{2}}\] in a buffer solution of \[pH=8\] is

A. \[{{10}^{-8}}\]
B. \[{{10}^{-6}}\]
C. \[{{10}^{-2}}\]
D. \[{{10}^{-4}}\]
Answer» D. \[{{10}^{-4}}\]
10818.

The degree of ionization of a compound depends on

A. size of solute
B. nature of solute
C. nature of vessel
D. quantity of electricity passed
Answer» C. nature of vessel
10819.

The number of moles of \[N{{H}_{3}}\] that must be added to 1 L of 0.1 M \[AgN{{O}_{3}}\] to reduce \[A{{g}^{+}}\] concentration to \[2\times {{10}^{-7}}M\] are Given, \[{{K}_{dis}}{{[Ag{{(N{{H}_{3}})}_{2}}]}^{+}}=6.8\times {{10}^{-8}}\]

A. 0.184 M
B. 0.384 M
C. 0.293 M
D. 0.0539 M
Answer» C. 0.293 M
10820.

Taking \[Ba{{(OH)}_{2}}\] to be completely ionised. The pH of its 0.001 M solution is

A. 11.3
B. 2.7
C. 11
D. 3
Answer» B. 2.7
10821.

What is the minimum pH when \[Fe{{(OH)}_{3}},\] starts precipitating from a solution containing \[0.1M\text{ }FeC{{l}_{3}}\]? \[{{k}_{sp}}\] of \[Fe{{(OH)}_{3}}=8\times {{10}^{-13}}{{M}^{3}}(\log \text{ }2\text{ }=\text{ }0.3)\]

A. 3.7
B. 5.7
C. 10.3
D. 8.3
Answer» D. 8.3
10822.

100 mL of 1 M \[HCl\] is mixed with 50 mL of 2 M \[HCl\]. Hence, \[\left[ {{H}_{3}}{{O}^{+}} \right]\] is:

A. 1.00 M
B. 1.50 M
C. 1.33 M
D. 3.00 M
Answer» D. 3.00 M
10823.

Which will act as a buffer solution

A. \[200\text{ }ml\text{ }N/10\text{ }NaOH\]\[+100\text{ }ml\text{ }N/20\text{ }HCl\]
B. \[100\text{ }ml\text{ }0.1\text{ }N\text{ }NaOH\]\[+100\text{ }ml\text{ }0.1\text{ }N\text{ }HCl\]
C. \[100\,\,ml\,\,0.1\,\,N\,NaOH\]\[+50\,\,ml\,\,0.2N\,C{{H}_{3}}OOH\]
D. \[100\text{ }ml\text{ }0.1\text{ }N\text{ }NaOH\]\[+150\text{ }ml\text{ }0.1\text{ }N\text{ }HCN\]
Answer» E.
10824.

Which relation is wrong

A. \[{{10}^{-pH}}+{{10}^{-pOH}}={{10}^{-14}}\]
B. \[pH\alpha \frac{1}{[{{H}^{+}}]}\]
C. \[{{K}_{w}}\alpha \,T\]
D. dissociation constant of water \[K=1.8\times {{10}^{-16}}\]
Answer» B. \[pH\alpha \frac{1}{[{{H}^{+}}]}\]
10825.

pH of an aqueous solution of HCl is 5. if 1 c.c. of this solution is diluted to 1000 times. The pH will become

A. 8
B. 5
C. 6.9
D. None
Answer» D. None
10826.

In which case change in pH is maximum?

A. 1 mL of pH = 2 is diluted to 100 mL
B. 0.01 mol of \[NaOH\] is added to 100 mL of 0.01 M \[NaOH\] solution
C. 100 mL of \[{{H}_{2}}O\] is added to 900 mL of \[{{10}^{-6}}\] M \[HCl\]
D. 100 mL of pH = 2 solution is mixed with 100 mL of pH = 12
Answer» E.
10827.

A solution is saturated with respect to \[SrC{{O}_{2}}\] and \[Sr{{F}_{2}}\] The \[\left[ C{{O}_{3}}^{2-} \right]\] was found to be \[1.2\times {{10}^{-3}}M.\] The concentration of \[{{F}^{-}}\] in the solution would be Given\[{{K}_{sp}}\,of\,SrC{{O}_{3}}=7.0\times {{10}^{-10}}{{M}^{2}}\], \[{{K}_{sp}}\]of \[Sr{{F}_{2}}=7.9\times {{10}^{-10}}{{M}^{3}}\]

A. \[1.3\times {{10}^{-3}}M\]
B. \[2.6\times {{10}^{-2}}M\]
C. \[3.7\times {{10}^{-2}}M\]
D. \[5.8\times {{10}^{-7}}M\]
Answer» D. \[5.8\times {{10}^{-7}}M\]
10828.

A solution of \[N{{H}_{4}}Cl\] and \[N{{H}_{3}}\] has pH = 8.0. Which of the following hydroxides may be precipitated when this solution is mixed with equal volume of 0.2 M of metal ion.

A. \[Ba{{\left( OH \right)}_{2}}\left( {{K}_{sp}}=1.1\times {{10}^{-4}} \right)\]
B. \[Mg{{\left( OH \right)}_{2}}\left( {{K}_{sp}}=3.5\times {{10}^{-4}} \right)\]
C. \[Fe{{(OH)}_{2}}\left( {{K}_{sp}}=8.1\times {{10}^{-16}} \right)\]
D. \[Ca{{\left( OH \right)}_{2}}\left( {{K}_{sp}}=2.1\times {{10}^{-5}} \right).\]
Answer» D. \[Ca{{\left( OH \right)}_{2}}\left( {{K}_{sp}}=2.1\times {{10}^{-5}} \right).\]
10829.

The partial pressure of \[C{{H}_{3}}OH(g),CO(g)\] and \[{{H}_{2}}(g)\] in equilibrium mixture for the reaction, \[CO(g)+2{{H}_{2}}(g)\rightleftharpoons C{{H}_{3}}OH(g)\] are 2.0, 1.0 and 0.1 atm respectively at \[427{}^\circ C\]. The value of \[{{K}_{p}}\] for the decomposition of \[C{{H}_{3}}OH\] to CO and \[{{H}_{2}}\] is

A. \[{{10}^{2}}atm\]
B. \[2\times {{10}^{2}}at{{m}^{-1}}\]
C. \[50\text{ }at{{m}^{2}}\]
D. \[5\times {{10}^{-3}}at{{m}^{2}}\]
Answer» E.
10830.

Which one of the following arrangements represents the correct order of the proton affinity of the given species:

A. \[{{I}^{-}}<{{F}^{-}}<H{{S}^{-}}<NH_{2}^{-}\]
B. \[H{{S}^{-}}<NH_{2}^{-}<{{F}^{-}}<{{I}^{-}}\]
C. \[{{F}^{-}}<{{I}^{-}}<\text{ }NH_{2}^{-}<H{{S}^{-}}\]
D. \[NH_{2}^{-}<H{{S}^{-}}<{{I}^{-}}<{{F}^{-}}\]
Answer» B. \[H{{S}^{-}}<NH_{2}^{-}<{{F}^{-}}<{{I}^{-}}\]
10831.

What is the percentage hydrolysis of NaCN in N/80 solution when the dissociation constant for \[HCN\] is \[1.3\times {{10}^{-9}}\]and \[{{K}_{w}}=1.0\times {{10}^{-14}}\]

A. 2.48
B. 5.26
C. 8.2
D. 9.6
Answer» B. 5.26
10832.

\[NaOH\] is a strong base. What will be pH of \[5.0\times {{10}^{-2}}M\,NaOH\] solution? \[\left( log2=0.3 \right)\]

A. 14
B. 13.7
C. 13
D. 12.7
Answer» E.
10833.

Given(i) \[HCN(aq)+{{H}_{2}}O(l)\rightleftharpoons \] \[{{H}_{3}}{{O}^{+}}(aq)+C{{N}^{-}}(aq){{K}_{a}}=6.2\times {{10}^{-10}}\](ii) \[C{{N}^{-}}(aq)+{{H}_{2}}O(l)\rightleftharpoons \] \[HCN(aq)+O{{H}^{-}}(aq){{K}_{b}}=1.6\times {{10}^{-5}}.\]These equilibria show the following order of the relative base strength,

A. \[O{{H}^{-}}>{{H}_{2}}O>C{{N}^{-}}\]
B. \[O{{H}^{-}}>C{{N}^{-}}>{{H}_{2}}O\]
C. \[{{H}_{2}}O>C{{N}^{-}}>O{{H}^{-}}\]
D. \[C{{N}^{-}}>{{H}_{2}}O>O{{H}^{-}}\]
Answer» C. \[{{H}_{2}}O>C{{N}^{-}}>O{{H}^{-}}\]
10834.

20 mL of 0.2 M \[NaOH\] are added to 50 mL of 0.2 M \[C{{H}_{2}}COOH\]\[({{K}_{a}}=1.8\times 10{{~}^{-5}})\] the pH of the solution is

A. 4.56
B. 4.73
C. 9.45
D. 6.78
Answer» B. 4.73
10835.

Which equilibrium can be described as an acid- base reaction using the Lewis acid-base definition but not using the Bronsted-Lowry definition?

A. \[2N{{H}_{3}}+{{H}_{2}}S{{O}_{4}}\rightleftharpoons 2N{{H}_{4}}^{+}+S{{O}_{4}}^{2-}\]
B. \[N{{H}_{3}}+C{{H}_{3}}COOH\rightleftharpoons N{{H}_{4}}^{+}+C{{H}_{3}}CO{{O}^{-}}\]
C. \[{{H}_{2}}O+C{{H}_{3}}COOH\rightleftharpoons {{H}_{3}}{{O}^{+}}+C{{H}_{3}}CO{{O}^{-}}\]
D. \[{{[Cu{{({{H}_{2}}O)}_{4}}]}^{2+}}+4N{{H}_{3}}\rightleftharpoons {{[Cu{{(N{{H}_{3}})}_{4}}]}^{2+}}+4{{H}_{2}}O\]
Answer» E.
10836.

A solution contains 10 mL 0.1 N \[NaOH\] and 10 mL 0.05 N \[{{H}_{2}}S{{O}_{4}}\], pH of this solution is:

A. less than 7
B. 7
C. zero
D. greater than 7
Answer» C. zero
10837.

One mole of \[S{{O}_{3}}\] was placed in a one litre reaction flask at a given temperature when the reaction equilibrium was established in the reaction. \[2S{{O}_{3}}\rightleftharpoons 2S{{O}_{2}}+{{O}_{2}}\]. The vessel was found to contain 0.6 mole of\[S{{O}_{2}}\]. The value of the equilibrium constant is

A. 0.36
B. 0.675
C. 0.45
D. 0.54
Answer» C. 0.45
10838.

If the synthesis of ammonia from Haber's process is carried out with exactly the same starting conditions (of partial pressure and temperature) but using \[{{D}_{\text{2}}}\](deuterium) in place of\[{{H}_{2}}\]. Then

A. the equilibrium will be disturbed
B. the composition of reaction mixture will remain same at equilibrium.
C. Use of isotope in reaction will not produce ammonia.
D. At equilibrium rate of forward reaction will be greater than the rate of reverse reaction
Answer» C. Use of isotope in reaction will not produce ammonia.
10839.

For the reaction \[{{H}_{2}}(g)+{{I}_{2}}(g)\rightleftharpoons 2HI(g)\] at 721 K, the value of equilibrium constant is 50, when equilibrium concentration of both is 5M. Value of \[{{K}_{p}}\] under the same conditions will be

A. 0.02
B. 0.2
C. 50
D. 50 RT
Answer» D. 50 RT
10840.

The equilibrium constant for a reaction is K, and the reaction quotient is Q. For a particular reaction mixture, the ratio \[\frac{K}{Q}\]. is 0.33. This means that:

A. The reaction mixture will equilibrate to form more reactant species
B. the reaction mixture will equilibrate to form more product species
C. the equilibrium ratio of reactant to product concentrations will be 3
D. the equilibrium ratio of reactant to product concentrations will be 0.33
Answer» B. the reaction mixture will equilibrate to form more product species
10841.

A gaseous compound of molecular mass 82.1 dissociates on heating to 400 K as \[{{X}_{2}}{{Y}_{4}}(g)\rightleftharpoons {{X}_{2}}(g)+2{{Y}_{2}}(g)\] The density of the equilibrium mixture at a pressure of 1 atm and temperature of 400K is\[2.0g{{L}^{-1}}\]. The percentage dissociation of the compound is

A. 0.125
B. 0.485
C. 0.901
D. 0.25
Answer» B. 0.485
10842.

The reaction \[CaC{{O}_{3}}\] ⇌ \[CaO+C{{O}_{2}}(g)\] goes to completion in lime kiln because [MP PMT/PET 1988; CPMT 1990]

A. Of the high temperature
B. \[CaO\] is more stable than \[CaC{{O}_{3}}\]
C. \[CaO\] is not dissociated
D. \[C{{O}_{2}}\] escapes continuously
Answer» E.
10843.

From separate solutions of sodium salts, NaW, NaX, NaY and NaZ have pH7.0,9.010.0 and ll.O respectively. When each solution was 0.1 M, the strongest acid is:

A. HW
B. HX
C. HY
D. HZ
Answer» B. HX
10844.

If \[p{{K}_{b}}\]A for fluoride ion at \[25{}^\circ C\]is 10.83, (he ionization constant of hydrofluoric acid in water at this temperature is

A. \[1.74\times {{10}^{-5}}\]
B. \[3.52\times {{10}^{-3}}\]
C. \[6.75\times {{10}^{-4}}\]
D. \[5.38\times {{10}^{-2}}\]
Answer» D. \[5.38\times {{10}^{-2}}\]
10845.

Solubility product of silver bromide is \[5.0\times {{10}^{-13}}\]. The quantity of potassium bromid (molar mass taken as 120 g \[mo{{l}^{-1}}\]) to be added to 1 L of 0.05 M solution of silver nitrate to start the precipitatin of AgBr is

A. \[1.2\times {{10}^{-10}}g\]
B. \[1.2\times {{10}^{-9}}g\]
C. \[6.2\times {{10}^{-5}}g\]
D. \[5.0\times {{10}^{-8}}g\]
Answer» C. \[6.2\times {{10}^{-5}}g\]
10846.

The following equilibrium is established when \[HCl{{O}^{{}}}_{4}\]is dissolved in weak acid \[HF\].\[HF+HCl{{O}_{4}}\rightleftharpoons Cl{{O}_{4}}^{-}+{{H}_{2}}{{F}^{+}}\] Which of the following is correct set of conjugate acid

A. HF and \[HCl{{O}_{4}}\]
B. HF and \[Cl{{O}_{4}}^{-}\]
C. HF and \[{{H}_{2}}{{F}^{+}}\]
D. \[HCl{{O}_{4}}\] and \[{{H}_{2}}{{F}^{+}}\]
Answer» D. \[HCl{{O}_{4}}\] and \[{{H}_{2}}{{F}^{+}}\]
10847.

For the following three reactions, 1, 2 and 3, equilibrium constants are given (1) \[C{{O}_{(g)}}+{{H}_{2}}{{O}_{(g)}}\rightleftarrows C{{O}_{2(g)}}+{{H}_{2(g)}};{{K}_{1}}\] (2) \[C{{H}_{4(g)}}\]\[+{{H}_{2}}{{O}_{(g)}}\rightleftarrows \]\[C{{O}_{(g)}}\]\[3{{H}_{2(g)}};{{K}_{2}}\] (3) \[C{{H}_{4(g)}}+2{{H}_{2}}{{O}_{(g)}}\rightleftarrows C{{O}_{2(g)}}+4{{H}_{2(g)}};{{K}_{3}}\] Which of the following relationship is correct?

A. \[{{K}_{1}}\sqrt{{{K}_{2}}}={{K}_{3}}\]
B. \[{{K}_{2}}{{K}_{3}}={{K}_{1}}\]
C. \[{{K}_{3}}={{K}_{1}}{{K}_{2}}\]
D. \[{{K}_{3}}.\,{{K}^{3}}_{2}={{K}^{2}}_{1}\]
Answer» D. \[{{K}_{3}}.\,{{K}^{3}}_{2}={{K}^{2}}_{1}\]
10848.

Which is a basic salt [MP PMT 1985]

A. \[PbS\]
B. \[PbC{{O}_{3}}\]
C. \[PbS{{O}_{4}}\]
D. \[2PbC{{O}_{3}}.Pb{{(OH)}_{2}}\]
Answer» E.
10849.

Which of the following salt is acidic [CPMT 1979, 81; NCERT 1979, 81; MP PET 1990; JIPMER 2002]

A. \[N{{a}_{2}}S{{O}_{4}}\]
B. \[NaHS{{O}_{3}}\]
C. \[N{{a}_{2}}S{{O}_{3}}\]
D. \[N{{a}_{2}}S\]
Answer» C. \[N{{a}_{2}}S{{O}_{3}}\]
10850.

\[B{{F}_{3}}\] is used as a catalyst in several industrial processes due to its [Kerala (Med.) 2002]

A. Strong reducing agent
B. Weak reducing agent
C. Strong Lewis acid nature
D. Weak Lewis acid character
Answer» D. Weak Lewis acid character