MCQOPTIONS
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MCQOPTIONS
This section includes 74 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Which of the following sulphides has the lowest solubility product [KCET 1996] |
| A. | \[FeS\] |
| B. | \[MnS\] |
| C. | \[PbS\] |
| D. | \[ZnS\] |
| Answer» D. \[ZnS\] | |
| 52. |
Which one of the following compounds is a Lewis acid [EAMCET 1997] |
| A. | \[PC{{l}_{3}}\] |
| B. | \[BC{{l}_{3}}\] |
| C. | \[NC{{l}_{3}}\] |
| D. | \[CHC{{l}_{3}}\] |
| Answer» B. \[BC{{l}_{3}}\] | |
| 53. |
In a reversible reaction, the catalyst[KCET 2003] |
| A. | Increases the activation energy of the backward reaction |
| B. | Increases the activation energy of the forward reaction |
| C. | Decreases the activation energy of both, forward and backward reaction |
| D. | Decreases the activation energy of forward reaction |
| Answer» D. Decreases the activation energy of forward reaction | |
| 54. |
In an equilibrium reaction for which \[\Delta {{G}^{0}}=0\] , the equilibrium constant \[K=\] [BHU 1987] |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 10 |
| Answer» C. 2 | |
| 55. |
Which among the following is strongest acid [BHU 2005] |
| A. | H(ClO)O2 |
| B. | H(ClO)O3 |
| C. | H(ClO)O |
| D. | H(ClO) |
| Answer» C. H(ClO)O | |
| 56. |
Which of the following is the weakest base [IIT 1980] |
| A. | \[NaOH\] |
| B. | \[Ca\,{{(OH)}_{2}}\] |
| C. | \[N{{H}_{4}}OH\] |
| D. | \[KOH\] |
| Answer» D. \[KOH\] | |
| 57. |
The strongest acid is [DPMT 2000] |
| A. | \[{{H}_{3}}As{{O}_{4}}\] |
| B. | \[{{H}_{3}}As{{O}_{3}}\] |
| C. | \[{{H}_{3}}P{{O}_{3}}\] |
| D. | \[{{H}_{3}}P{{O}_{4}}\] |
| Answer» E. | |
| 58. |
In the reaction \[BC{{l}_{3}}+P{{H}_{3}}\,\to \,C{{l}_{3}}B-P{{H}_{3}},\] Lewis base is [EAMCET 1986] |
| A. | \[BC{{l}_{3}}\] |
| B. | \[P{{H}_{3}}\] |
| C. | \[C{{l}_{3}}B-P{{H}_{3}}\] |
| D. | None of these |
| Answer» C. \[C{{l}_{3}}B-P{{H}_{3}}\] | |
| 59. |
Which one is Lewis acid [CPMT 1997] |
| A. | \[C{{l}^{-}}\] |
| B. | \[A{{g}^{+}}\] |
| C. | \[{{C}_{2}}{{H}_{5}}OH\] |
| D. | \[{{S}^{2-}}\] |
| Answer» C. \[{{C}_{2}}{{H}_{5}}OH\] | |
| 60. |
Which of the following cannot act as a Lewis or Bronsted acid [DCE 2001] |
| A. | \[B{{F}_{3}}\] |
| B. | \[AlC{{l}_{3}}\] |
| C. | \[SnC{{l}_{4}}\] |
| D. | \[CC{{l}_{4}}\] |
| Answer» E. | |
| 61. |
Conjugate base of \[HPO_{4}^{2-}\] is [MP PMT 1995] |
| A. | \[PO_{4}^{3-}\] |
| B. | \[{{H}_{2}}PO_{4}^{-}\] |
| C. | \[{{H}_{3}}P{{O}_{4}}\] |
| D. | \[{{H}_{4}}P{{O}_{3}}\] |
| Answer» B. \[{{H}_{2}}PO_{4}^{-}\] | |
| 62. |
A solution of sodium acetate in water will [MNR 1979] |
| A. | Turn red litmus blue |
| B. | Turn blue litmus red |
| C. | Not effect litmus |
| D. | Decolorizes litmus |
| Answer» B. Turn blue litmus red | |
| 63. |
\[{{H}_{3}}B{{O}_{3}}\] is [IIT Screening 2003] |
| A. | Monobasic and weak Lewis acid |
| B. | Monobasic and weak Bronsted acid |
| C. | Monobasic and strong Lewis acid |
| D. | Tribasic and weak Bronsted acid |
| Answer» B. Monobasic and weak Bronsted acid | |
| 64. |
Which of the following can act both as Bronsted acid and Bronsted base [MP PET 1995; MP PET/PMT 1998] |
| A. | \[C{{l}^{-}}\] |
| B. | \[HCO_{3}^{-}\] |
| C. | \[{{H}_{3}}{{O}^{+}}\] |
| D. | \[O{{H}^{-}}\] |
| Answer» C. \[{{H}_{3}}{{O}^{+}}\] | |
| 65. |
Accepting the definition that an acid is a proton donor, the acid in the following reaction \[N{{H}_{3}}+{{H}_{2}}O\to NH_{4}^{+}+O{{H}^{-}}\] is[Kerala (Med.) 2003] |
| A. | \[N{{H}_{3}}\] |
| B. | \[{{H}^{+}}\] |
| C. | \[NH_{4}^{+}\] |
| D. | \[{{H}_{2}}O\] |
| Answer» E. | |
| 66. |
Strongest conjugate base is[DPMT 2004] |
| A. | \[C{{l}^{-}}\] |
| B. | \[B{{r}^{-}}\] |
| C. | \[{{F}^{-}}\] |
| D. | \[{{I}^{-}}\] |
| Answer» D. \[{{I}^{-}}\] | |
| 67. |
Which one of the following is called amphoteric solvent[UPSEAT 2004] |
| A. | Ammonium hydroxide |
| B. | Chloroform |
| C. | Benzene |
| D. | Water |
| Answer» E. | |
| 68. |
For a weak acid, the incorrect statement is [Pb. PMT 2004] |
| A. | Its dissociation constant is low |
| B. | Its \[p{{K}_{a}}\] is very low |
| C. | It is partially dissociated |
| D. | Solution of its sodium salt is alkaline in water |
| Answer» C. It is partially dissociated | |
| 69. |
The solvent which neither accepts proton nor donates proton is called[RPMT 2000] |
| A. | Amphoteric |
| B. | Neutral |
| C. | Aprotic |
| D. | Amphiprotic |
| Answer» D. Amphiprotic | |
| 70. |
Which of the following is not a Lewis acid [CBSE PMT 1996] |
| A. | \[B{{F}_{3}}\] |
| B. | \[FeC{{l}_{3}}\] |
| C. | \[Si{{F}_{4}}\] |
| D. | \[{{C}_{2}}{{H}_{4}}\] |
| Answer» E. | |
| 71. |
The aqueous solution of \[CuS{{O}_{4}}\] is [CPMT 1985] |
| A. | Acidic |
| B. | Basic |
| C. | Neutral |
| D. | Amphoteric |
| Answer» B. Basic | |
| 72. |
When \[FeC{{l}_{3}}\] gets soluble in water, then its solution represents which of the characteristics [MP PET/PMT 1988] |
| A. | Amphoteric |
| B. | Acidic |
| C. | Basic |
| D. | Neutral |
| Answer» C. Basic | |
| 73. |
The conjugate acid of \[HPO_{4}^{2-}\]is [MP PMT 1987, 90, 91; EAMCET 1993] |
| A. | \[{{H}_{2}}PO_{4}^{-}\] |
| B. | \[PO_{4}^{3-}\] |
| C. | \[{{H}_{3}}P{{O}_{4}}\] |
| D. | \[{{H}_{3}}P{{O}_{3}}\] |
| Answer» B. \[PO_{4}^{3-}\] | |
| 74. |
\[B{{F}_{3}}\] 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 | |