MCQOPTIONS
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MCQOPTIONS
This section includes 140 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
\[CaC{{O}_{3}}CaO+C{{O}_{2}}\] reaction in a line goes to completion because [AFMC 2005] |
| A. | \[CaO\]does not react to \[C{{O}_{2}}\] to give \[CaC{{O}_{3}}\] |
| B. | Backward reaction is very slow |
| C. | \[C{{O}_{2}}\] formed escapes out |
| D. | None of these |
| Answer» D. None of these | |
| 52. |
In India at the occasion of marriages, the fire works used give green flame. Which one of the following radicals may be present [CPMT 1980; AFMC 1989; MP PMT 2001; MP PET 2002] |
| A. | \[Na\] |
| B. | \[K\] |
| C. | \[Ba\] |
| D. | \[Ca\] |
| Answer» D. \[Ca\] | |
| 53. |
Alloys of ...... metal are light and strong and so are used in the manufacture of aeroplane parts [EAMCET 1978] |
| A. | \[Cr\] |
| B. | \[Sn\] |
| C. | \[Fe\] |
| D. | \[Mg\] |
| Answer» E. | |
| 54. |
Which of the following has highest electrode potential [CPMT 1990] |
| A. | \[Be\] |
| B. | \[Mg\] |
| C. | \[Ca\] |
| D. | \[Ba\] |
| Answer» B. \[Mg\] | |
| 55. |
The right order of the solubility of sulphates of alkaline earth metals in water is [MP PET 1993; Pb. CET 2000; DPMT 2004] |
| A. | \[Be>Ca>Mg>Ba>Sr\] |
| B. | \[Mg>Be>Ba>Ca>Sr\] |
| C. | \[Be>Mg>Ca>Sr>Ba\] |
| D. | \[Mg>Ca>Ba>Be>Sr\] |
| Answer» D. \[Mg>Ca>Ba>Be>Sr\] | |
| 56. |
Electronegativity of beryllium is approximately equal to that of [MP PMT 1993] |
| A. | Aluminium |
| B. | Boron |
| C. | Magnesium |
| D. | Sodium |
| Answer» B. Boron | |
| 57. |
Calcium cynamide is [CPMT 1986, 93] |
| A. | \[CaCHN{{H}_{2}}\] |
| B. | \[CaC{{N}_{2}}\] |
| C. | \[Ca{{C}_{2}}{{N}_{2}}\] |
| D. | \[Ca{{(CN)}_{2}}\] |
| Answer» C. \[Ca{{C}_{2}}{{N}_{2}}\] | |
| 58. |
Bleaching powder is a compound having the molecular formula [CPMT 1986, 89, 90, 93; MP PMT 1996; BHU 2005] |
| A. | \[CaOC{{l}_{3}}\] |
| B. | \[CaOC{{l}_{2}}\] |
| C. | \[CaClO\] |
| D. | \[CaCl{{O}_{3}}\] |
| Answer» C. \[CaClO\] | |
| 59. |
For bleaching powder, which is incorrect [EAMCET 1984; CPMT 1985] |
| A. | Reacts with dilute acid to release chlorine |
| B. | Oxidising agent |
| C. | Light yellow coloured powder |
| D. | Highly soluble in water |
| Answer» E. | |
| 60. |
Phosphine is obtained from the following ore [Roorkee 1995] |
| A. | Calcium superphosphite |
| B. | Calcium phosphide |
| C. | Potassium phosphide |
| D. | Calcium hypophosphide |
| Answer» C. Potassium phosphide | |
| 61. |
Calcium salts give which colour when put in a flame |
| A. | Brick red |
| B. | Green |
| C. | White |
| D. | Pink |
| Answer» B. Green | |
| 62. |
Deep pink colour is given to flame by the salts of |
| A. | Strontium |
| B. | Potassium |
| C. | Zinc |
| D. | Barium |
| Answer» B. Potassium | |
| 63. |
Mark the incorrect statement |
| A. | Lithopone is cheap and possess good covering power |
| B. | Lithopone is yellow pigment |
| C. | Lithopone is prepared by mixing barium sulphide and zinc sulphate |
| D. | Lithopone is a mixture of barium sulphate and zinc sulphide |
| Answer» C. Lithopone is prepared by mixing barium sulphide and zinc sulphate | |
| 64. |
The highly efficient method of obtaining beryllium is [NCERT 1982] |
| A. | Dissociation of beryllium carbide |
| B. | Electrolysis of fused beryllium chloride |
| C. | Reduction of beryllium oxide with carbon |
| D. | Reduction of beryllium halide with magnesium |
| Answer» C. Reduction of beryllium oxide with carbon | |
| 65. |
Gypsum \[CaS{{O}_{4}}.2{{H}_{2}}O\] on heating to about \[{{120}^{o}}C\] forms a compound which has the chemical composition represented by [CPMT 1978, 82, 88, 90; EAMCET 1978; DPMT 1982, 83; NCERT 1979] |
| A. | \[CaS{{O}_{4}}\] |
| B. | \[2CaS{{O}_{4}}.{{H}_{2}}O\] |
| C. | \[CaS{{O}_{4}}.{{H}_{2}}O\] |
| D. | \[2CaS{{O}_{4}}.3{{H}_{2}}O\] |
| Answer» C. \[CaS{{O}_{4}}.{{H}_{2}}O\] | |
| 66. |
Mortar is a mixture of [EAMCET 1998; AIIMS 2000] |
| A. | \[CaC{{O}_{3}},\] sand and water |
| B. | Slaked lime and water |
| C. | Slaked lime, sand and water |
| D. | \[CaC{{O}_{3}}\]and \[CaO\] |
| Answer» D. \[CaC{{O}_{3}}\]and \[CaO\] | |
| 67. |
The composition formulae of gypsum is [CPMT 1975, 78, 82; DPMT 1982; IIT 1978; MNR 1981; MP PMT 1996; RPMT 1997] |
| A. | \[{{\left( CaS{{O}_{4}} \right)}_{2}}.{{H}_{2}}O\] |
| B. | \[2CaS{{O}_{4}}\] |
| C. | \[CaS{{O}_{4}}.2{{H}_{2}}O\] |
| D. | \[2CaS{{O}_{4}}.{{H}_{2}}O\] |
| Answer» D. \[2CaS{{O}_{4}}.{{H}_{2}}O\] | |
| 68. |
Which of the following sulphates have the highest solubility in water [EAMCET 1980,84,85; MP PMT 1994; Kurukshetra CEE 1998; AFMC 1990; MP PET 1994] |
| A. | \[MgS{{O}_{4}}\] |
| B. | \[BaS{{O}_{4}}\] |
| C. | \[CaS{{O}_{4}}\] |
| D. | \[BeS{{O}_{4}}\] |
| Answer» E. | |
| 69. |
Li shows the diagonal relationship with [Pb.CET 2001] |
| A. | Mg |
| B. | B |
| C. | Al |
| D. | C |
| Answer» B. B | |
| 70. |
Among \[K,\ Ca,\ Fe,\]and \[Zn\], the element which can form more than one binary compound with chlorine is[CBSE PMT 2004] |
| A. | K |
| B. | Ca |
| C. | Fe |
| D. | Zn |
| Answer» D. Zn | |
| 71. |
Iron pipes lying under acidic soil are often attached to blocks of magnesium for protection from rusting. Magnesium offers protection to iron against corrosion because it [DPMT 2004; BHU 2004] |
| A. | Prevents air from reaching the surface of iron |
| B. | is more readily converted into positive ions |
| C. | Is higher than iron |
| D. | Forms a corrosion-resistance alloy with iron |
| Answer» C. Is higher than iron | |
| 72. |
Which of the following is a false statement[CPMT 2004] |
| A. | Fluorine is more electronegative than chlorine |
| B. | Nitrogen has greater \[\text{I}{{\text{E}}_{1}}\]than oxygen |
| C. | Lithium is amphoteric |
| D. | Chlorine is an oxidising agent |
| Answer» D. Chlorine is an oxidising agent | |
| 73. |
Alkaline earth metals are denser than alkali metals, because metallic bonding in alkaline earth's metal, is[BHU 2004] |
| A. | Stronger |
| B. | Weaker |
| C. | Volatile |
| D. | Not present |
| Answer» B. Weaker | |
| 74. |
Aluminium reacts with caustic soda to form [DCE 2004] |
| A. | Aluminium hydroxide |
| B. | Aluminium oxide |
| C. | Sodium meta-aluminate |
| D. | Sodium tetra aluminate |
| Answer» D. Sodium tetra aluminate | |
| 75. |
Electrolysis of molten sodium chloride leads to the formation of [KCET 1990] |
| A. | \[Na\] and \[{{H}_{2}}\] |
| B. | \[Na\] and \[{{O}_{2}}\] |
| C. | \[{{H}_{2}}\] and \[{{O}_{2}}\] |
| D. | \[Na\] and \[C{{l}_{2}}\] |
| Answer» E. | |
| 76. |
Which one of the following is the most electropositive element [Pb. PMT 2000] |
| A. | Calcium |
| B. | Chlorine |
| C. | Potassium |
| D. | Carbon |
| Answer» D. Carbon | |
| 77. |
Lithium shows similarities to magnesium in its chemical behaviour because [Pb. PMT 2000] |
| A. | Similar size, greater electronegativity and similar polarizing power. |
| B. | Similar size same electronegativity and lower polarizing power |
| C. | Similar size, same electronegativity and similar high polarizing power |
| D. | None of these |
| Answer» D. None of these | |
| 78. |
Characteristic feature of alkali metals is [RPMT 2000; MP PMT 2004] |
| A. | Good conductor of heat and electricity |
| B. | High melting points |
| C. | Low oxidation potentials |
| D. | High ionization potentials |
| Answer» B. High melting points | |
| 79. |
When potassium ferrocyanide crystals are heated with concentrated sulphuric acid, the gas evolved is [CBSE PMT PMT 1999; KCET 2000] |
| A. | Ammonia |
| B. | Sulphur dioxide |
| C. | Carbon dioxide |
| D. | Carbon monoxide |
| Answer» E. | |
| 80. |
The reaction of water with sodium and potassium is [BHU 1999] |
| A. | Exothermic |
| B. | Endothermic |
| C. | Reversible |
| D. | Irreversible and endothermic |
| Answer» B. Endothermic | |
| 81. |
\[N{{a}_{2}}C{{O}_{3}}\] can be manufactured by Solvey's process but \[{{K}_{2}}C{{O}_{3}}\] cannot be prepared because [MP PMT 1993] |
| A. | \[{{K}_{2}}C{{O}_{3}}\] is more soluble |
| B. | \[{{K}_{2}}C{{O}_{3}}\] is less soluble |
| C. | \[KHC{{O}_{3}}\] is more soluble than \[NaHC{{O}_{3}}\] |
| D. | \[KHC{{O}_{3}}\] is less soluble than \[NaHC{{O}_{3}}\] |
| Answer» D. \[KHC{{O}_{3}}\] is less soluble than \[NaHC{{O}_{3}}\] | |
| 82. |
Which is an ore of potassium [DPMT 1984; CPMT 1986; Kurukshetra CEE 1998] |
| A. | Carnellite |
| B. | Cryolite |
| C. | Bauxite |
| D. | Dolomite |
| Answer» B. Cryolite | |
| 83. |
As compared to lithium, sodium reacts quickly with water because [NCERT 1978, 80] |
| A. | Its molecular weight is less |
| B. | It is stronger electronegative |
| C. | It is stronger electropositive |
| D. | It is a metal |
| Answer» D. It is a metal | |
| 84. |
With the increase in atomic weights, melting points of the alkali metals [MP PMT 1995] |
| A. | Increase |
| B. | Decrease |
| C. | Remain constant |
| D. | Do not show definite trend |
| Answer» C. Remain constant | |
| 85. |
The strongest reducing agent of the alkali metal is [CPMT 1999; Pb.CET 2001] |
| A. | Li |
| B. | Na |
| C. | K |
| D. | Cs |
| Answer» B. Na | |
| 86. |
Sodium gives blue colour with \[N{{H}_{3}}\] solution, this blue colour is due to [UPSEAT 2000,02; AMU 2002; RPMT 2002] |
| A. | Ammoniated \[N{{a}^{\oplus }}\] |
| B. | Ammoniated \[N{{a}^{\Theta }}\] |
| C. | Ammoniated \[{{e}^{-}}\] |
| D. | \[N{{a}^{+}}/N{{a}^{-}}\]pair |
| Answer» D. \[N{{a}^{+}}/N{{a}^{-}}\]pair | |
| 87. |
The solubility of the alkali metal carbonates [Pune CET 1998] |
| A. | Increases at first and then decreases |
| B. | Does not show regular variation |
| C. | Increases as we go down the group |
| D. | Decreases as we go down the group |
| Answer» D. Decreases as we go down the group | |
| 88. |
On dissolving moderate amount of sodium metal in liquid \[N{{H}_{3}}\] at low temperature, which one of the following does not occur [AIIMS 2003] |
| A. | Blue coloured solution is obtained |
| B. | \[N{{a}^{+}}\] ions are formed in the solution |
| C. | Liquid \[N{{H}_{3}}\] becomes good conductor of electricity |
| D. | Liquid ammonia remains diamagnetic |
| Answer» E. | |
| 89. |
An inorganic compound first melts then resolidifies and then liberates a gas. It may be [DPMT 2002] |
| A. | \[Mn{{O}_{2}}\] |
| B. | \[A{{l}_{2}}{{O}_{3}}\] |
| C. | \[KMn{{O}_{4}}\] |
| D. | \[KCl{{O}_{3}}\] |
| Answer» E. | |
| 90. |
The strongest reducing agent is [MP PET 2001] |
| A. | K |
| B. | Al |
| C. | Mg |
| D. | Br |
| Answer» B. Al | |
| 91. |
When sodium dicarbonate is heated strongly for calcined in a kiln, it forms [CPMT 2000; KCET (Med.) 2000] |
| A. | \[Na\] |
| B. | \[N{{a}_{2}}C{{O}_{3}}\] |
| C. | \[NaC{{O}_{3}}\] |
| D. | \[NaHC{{O}_{3}}\] |
| Answer» C. \[NaC{{O}_{3}}\] | |
| 92. |
Composition of borax is [UPSEAT 2001;04] |
| A. | \[N{{a}_{2}}{{B}_{4}}{{O}_{7}}.\,4{{H}_{2}}O\] |
| B. | \[N{{a}_{2}}{{B}_{4}}{{O}_{7}}.\,10{{H}_{2}}O\] |
| C. | \[NaB{{O}_{2}}\] |
| D. | \[{{H}_{2}}\] |
| Answer» C. \[NaB{{O}_{2}}\] | |
| 93. |
Sodium thiosulphate is used in photography [UPSEAT 1999] |
| A. | To convert metallic silver into silver salt |
| B. | AgBr grain is reduced to non-metallic silver |
| C. | To remove reduced silver |
| D. | To remove undecomposed AgBr in the form of \[N{{a}_{3}}[Ag{{[{{S}_{2}}{{O}_{3}})}_{2}}]\] (a complex salt) |
| Answer» B. AgBr grain is reduced to non-metallic silver | |
| 94. |
Which one of the following is used as a disinfectant in water treatment [NDA 1999] |
| A. | Alum |
| B. | Charcoal |
| C. | Kieselguhr |
| D. | Potassium permanganate |
| Answer» E. | |
| 95. |
Acidified potassium permanganate solution is decolourised by [UPSEAT 2001] |
| A. | Bleaching powder |
| B. | Microcosmic salt |
| C. | Mohr salt |
| D. | White vitriol |
| Answer» D. White vitriol | |
| 96. |
Tincal is [Pb. PMT 2001] |
| A. | \[N{{a}_{2}}C{{O}_{3}}.\,10{{H}_{2}}O\] |
| B. | \[NaN{{O}_{3}}\] |
| C. | \[NaCl\] |
| D. | \[N{{a}_{2}}{{B}_{4}}{{O}_{7}}.10{{H}_{2}}O\] |
| Answer» E. | |
| 97. |
Which has minimum solubility [BHU 2003] |
| A. | \[B{{r}_{2}}{{S}_{3}}\] |
| B. | \[A{{g}_{2}}S\] |
| C. | CoS |
| D. | PbS |
| Answer» B. \[A{{g}_{2}}S\] | |
| 98. |
Which of the followings-block elements forms nitride [RPET 2003] |
| A. | Ba |
| B. | \[Be\] |
| C. | \[Ca\] |
| D. | \[Li\] |
| Answer» E. | |
| 99. |
The property of hydrogen which distinguishes it from other alkali metals is [MP PET 1996] |
| A. | Its electropositive character |
| B. | Its affinity for non-metals |
| C. | Its reducing character |
| D. | Its non-metallic character |
| Answer» E. | |
| 100. |
Which alkali metal is most metallic in character [MH CET 2001] |
| A. | K |
| B. | Cs |
| C. | Na |
| D. | Li |
| Answer» C. Na | |