Explore topic-wise MCQs in Chemistry.

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.

101.

\[KF\] combines with \[HF\] to form \[KH{{F}_{2}}\]. The compound contains the species [IIT 1996]

A. \[{{K}^{+}},\] \[{{F}^{-}}\] and \[{{H}^{+}}\]
B. \[{{K}^{+}},\] \[{{F}^{-}}\] and \[HF\]
C. \[{{K}^{+}}\] and \[{{\left[ H{{F}_{2}} \right]}^{-}}\]
D. \[{{\left[ KHF \right]}^{+}}\] and \[{{F}^{-}}\]
Answer» D. \[{{\left[ KHF \right]}^{+}}\] and \[{{F}^{-}}\]
Discussion
102.

\[K,\] \[Ca\] and \[Li\] metals may be arranged in the decreasing order of their standard electrode potentials as [CPMT 1990]

A. \[K,\] \[Ca,\] \[Li\]
B. \[Li,\] \[K,\] \[Ca\]
C. \[Li,\] \[Ca,\] \[K\]
D. \[Ca,\] \[Li,\] \[K\]
Answer» C. \[Li,\] \[Ca,\] \[K\]
Discussion
103.

Which of the following is the smallest cation [MP PMT 1993]

A. \[N{{a}^{+}}\]
B. \[M{{g}^{+2}}\]
C. \[C{{a}^{+2}}\]
D. \[A{{l}^{+3}}\]
Answer» E.
Discussion
104.

The elements of group IA provide a colour to the flame of Bunson burner due to [AIIMS 1987]

A. Low ionization potential
B. Low melting point
C. Softness
D. Presence of one electron in the outermost orbit
Answer» B. Low melting point
Discussion
105.

Which of the following statementiscorrectregarding alkali metals [NCERT 1981]

A. Cation is less stable than the atom
B. Cation is smaller than the atom
C. Size of cation and atom is the same
D. Cation is greater in size than the atom
Answer» C. Size of cation and atom is the same
Discussion
106.

The product obtained on fusion of \[BaS{{O}_{4}}\] and \[N{{a}_{2}}C{{O}_{3}}\] is [AFMC 2005]

A. \[BaC{{O}_{3}}\]
B. BaO
C. \[Ba{{(OH)}_{2}}\]
D. \[BaHS{{O}_{4}}\]
Answer» B. BaO
Discussion
107.

Potassium is kept in [CPMT 1976]

A. Alcohol
B. Water
C. Kerosene
D. Liquid ammonia
Answer» D. Liquid ammonia
Discussion
108.

Nelson cell is used for the preparation of [CPMT 1985]

A. Slaked lime
B. Baryta
C. Sodium
D. Caustic soda
Answer» E.
Discussion
109.

Nitre is [CPMT 1986]

A. \[AgN{{O}_{3}}\]
B. \[KN{{O}_{3}}\]
C. \[N{{H}_{4}}N{{O}_{3}}\]
D. \[NaN{{O}_{3}}\]
Answer» C. \[N{{H}_{4}}N{{O}_{3}}\]
Discussion
110.

Which of the following is correct [CPMT 1971]

A. All carbonates are soluble in water
B. Carbonates of \[Na,\] \[K\] and\[N{{H}_{4}}\] are soluble in water
C. Carbonates of \[Ca,\] \[Sr,\] \[Ba\] are soluble in water
D. All carbonates are insoluble
Answer» C. Carbonates of \[Ca,\] \[Sr,\] \[Ba\] are soluble in water
Discussion
111.

Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point [AIEEE 2005]

A. LiCl
B. NaCl
C. KCl
D. RbCl
Answer» C. KCl
Discussion
112.

The most dangerous method of preparing hydrogen would be by the action of \[HCl\] and [JIPMER 2000]

A. \[Al\]
B. \[K\]
C. \[Fe\]
D. \[Zn\]
Answer» C. \[Fe\]
Discussion
113.

Sodium metal can be stored under [CPMT 1972, 85; BHU 1983]

A. Benzene
B. Kerosene
C. Alcohol
D. Toluene
Answer» C. Alcohol
Discussion
114.

Ferric alum has the composition \[{{(N{{H}_{4}})}_{2}}S{{O}_{4}}.F{{e}_{2}}{{(S{{O}_{4}})}_{3}}.x{{H}_{2}}O\] [Orissa JEE 2002]

A. 7
B. 24
C. 6
D. 15
Answer» C. 6
Discussion
115.

Excess of \[N{{a}^{+}}\]ions in our system causes [KCET (Med.) 2001]

A. High B.P.
B. Low B.P.
C. Diabetes
D. Anaemia
Answer» B. Low B.P.
Discussion
116.

In which of the following processes, fused sodium hydroxide is electrolysed at a \[{{330}^{o}}C\]temperature for extraction of sodium [CBSE PMT 2000; AFMC 2001]

A. Castner's process
B. Down's process
C. Cyanide process
D. Both b and c
Answer» B. Down's process
Discussion
117.

Which of the following does not participate in the Solvey's process for the manufacture of \[N{{a}_{2}}C{{O}_{3}}\] [EAMCET 1998]

A. \[N{{H}_{3}}\]
B. \[NaCl\] solution
C. \[C{{O}_{2}}\]
D. \[{{H}_{2}}S{{O}_{4}}\]
Answer» E.
Discussion
118.

During the electrolysis of fused sodium chloride, the anodic reaction is [KCET 1998]

A. Reduction of sodium ions
B. Oxidation of sodium ions
C. Reduction of chloride ions
D. Oxidation of chloride ions
Answer» E.
Discussion
119.

When sodium chloride solution is electrolysed, the gas that is liberated at the cathode is [Kurukshetra CEE 1998]

A. Oxygen
B. Hydrogen
C. Chlorine
D. Air
Answer» C. Chlorine
Discussion
120.

When \[NaOH\] is prepared, the gas released is [CPMT 1996]

A. \[C{{l}_{2}}\]
B. \[{{H}_{2}}\]
C. \[{{O}_{2}}\]
D. \[{{H}_{2}}O\]
Answer» B. \[{{H}_{2}}\]
Discussion
121.

Sodium thiosulphate is prepared by [IIT 1996]

A. Reducing \[N{{a}_{2}}S{{O}_{4}}\] solution with \[{{H}_{2}}S\]
B. Boiling \[N{{a}_{2}}S{{O}_{3}}\] solution with \[S\] in alkaline medium
C. Neutralising \[{{H}_{2}}{{S}_{2}}{{O}_{3}}\] solution with \[NaOH\]
D. Boiling \[N{{a}_{2}}S{{O}_{3}}\] solution with \[S\] in acidic medium
Answer» C. Neutralising \[{{H}_{2}}{{S}_{2}}{{O}_{3}}\] solution with \[NaOH\]
Discussion
122.

Which of the following pair can't exist in solution [IIT 1986; DCE 1999]

A. \[NaHC{{O}_{3}}\] and \[NaOH\]
B. \[N{{a}_{2}}C{{O}_{3}}\] and \[NaOH\]
C. \[N{{a}_{2}}C{{O}_{3}}\] and \[NaCl\]
D. \[NaHC{{O}_{3}}\] and \[NaCl\]
Answer» B. \[N{{a}_{2}}C{{O}_{3}}\] and \[NaOH\]
Discussion
123.

Baking soda is [CPMT 1974, 78, 79, 91; BHU 1979; Manipal MEE 1995; AIIMS 1996; CPMT 1973; RPET 1999; AFMC 2001, 05; Pb. CET 2002]

A. \[N{{a}_{2}}C{{O}_{3}}\]
B. \[NaHC{{O}_{3}}\]
C. \[N{{a}_{2}}S{{O}_{4}}\]
D. \[{{K}_{2}}C{{O}_{3}}\]
Answer» C. \[N{{a}_{2}}S{{O}_{4}}\]
Discussion
124.

Sodium carbonate reacts with \[S{{O}_{2}}\] in aqueous medium to give [MP PMT 1982, 85]

A. \[NaHS{{O}_{3}}\]
B. \[N{{a}_{2}}S{{O}_{3}}\]
C. \[NaHS{{O}_{4}}\]
D. \[N{{a}_{2}}S{{O}_{4}}\]
Answer» B. \[N{{a}_{2}}S{{O}_{3}}\]
Discussion
125.

When \[NaOH\] crystals are left in open air, they acquire a fluid layer around each crystal as [CPMT 1974]

A. They start melting
B. They absorb moisture from air
C. They react with air to form a liquid compound
D. They absorb \[C{{O}_{2}}\] from air
Answer» C. They react with air to form a liquid compound
Discussion
126.

In the preparation of sodium carbonate, which of the following is used [AFMC 1992]

A. Slaked lime
B. Quick lime
C. Lime stone
D. \[NaOH\]
Answer» D. \[NaOH\]
Discussion
127.

The useful bye-products, obtained in the Solvay process of manufacturing sodium carbonate, are [KCET 1989, 93]

A. Quick lime and \[C{{O}_{2}}\]
B. \[NaHC{{O}_{3}}\] and \[N{{H}_{4}}Cl\]
C. \[N{{H}_{4}}Cl\] solution and quick lime
D. \[NaHC{{O}_{3}}\] and \[C{{O}_{2}}\]
Answer» D. \[NaHC{{O}_{3}}\] and \[C{{O}_{2}}\]
Discussion
128.

Sodium carbonate is manufactured by Solvay process, the products that are recycled are [KCET 1993; DCE 1999]

A. \[C{{O}_{2}}\] and \[N{{H}_{3}}\]
B. \[C{{O}_{2}}\] and \[N{{H}_{4}}Cl\]
C. \[NaCl,\,CaO\]
D. \[CaC{{l}_{2}},\,CaO\]
Answer» B. \[C{{O}_{2}}\] and \[N{{H}_{4}}Cl\]
Discussion
129.

Causticization process is used for the preparation of [CPMT 1985; BHU 1986]

A. Caustic soda
B. Caustic potash
C. Baryta
D. Slaked lime
Answer» B. Caustic potash
Discussion
130.

Sodium metal cannot be stored under [CPMT 1985, 88, 94]

A. Benzene
B. Kerosene
C. Alcohol
D. Toluene
Answer» D. Toluene
Discussion
131.

When \[NaCl\] is dissolved in water, the sodium ion is [CPMT 1989]

A. Oxidised
B. Reduced
C. Hydrolysed
D. Hydrated
Answer» E.
Discussion
132.

Which of the following does not illustrate the anomalous properties of lithium [MP PET 1993]

A. The melting point and boiling point of \[Li\] are comparatively high
B. \[Li\] is much softer than the other group I metals
C. \[Li\] forms a nitride \[L{{i}_{3}}N\] unlike group I metals
D. The ion of \[Li\] and its compounds are more heavily hydrated than those of the rest of the group
Answer» C. \[Li\] forms a nitride \[L{{i}_{3}}N\] unlike group I metals
Discussion
133.

When potassium dichromate crystal are heated with conc. HCl [DCE 1999]

A. \[{{O}_{2}}\] is evolved
B. Chromyl chloride vapours are evolved
C. \[C{{l}_{2}}\] is evolved
D. No reaction takes place
Answer» D. No reaction takes place
Discussion
134.

Which of the following alkali metals is smallest in size [CPMT 1990]

A. \[Rb\]
B. \[K\]
C. \[Na\]
D. \[Li\]
Answer» E.
Discussion
135.

The metal which reacts with water at room temperature is [CPMT 1985; MP PMT 1996; MP PET 1998]

A. Copper
B. Iron
C. Magnesium
D. Sodium
Answer» E.
Discussion
136.

The metallic lustre exhibited by sodium is explained by [IIT 1987]

A. Diffusion of sodium ions
B. Oscillation of loose electrons
C. Excitation of free protons
D. Existence of body centred cubic lattice
Answer» C. Excitation of free protons
Discussion
137.

The main salt soluble in sea water is [MP PMT 1998]

A. \[MgC{{l}_{2}}\]
B. \[NaCl\]
C. \[MgS{{O}_{4}}\]
D. \[CaS{{O}_{4}}\]
Answer» C. \[MgS{{O}_{4}}\]
Discussion
138.

Globar salt is [BHU 1983; CPMT 1988, 91;  IIT 1985; MP PET 2000]

A. \[MgS{{O}_{4}}.7{{H}_{2}}O\]
B. \[CuS{{O}_{4}}.\,5{{H}_{2}}O\]
C. \[FeS{{O}_{4}}.7{{H}_{2}}O\]
D. \[N{{a}_{2}}S{{O}_{4}}.\,10{{H}_{2}}O\]
Answer» E.
Discussion
139.

Saltcake is

A. Sodium sulphate
B. Sodium chloride
C. Sodium bisulphite
D. Sodium sulphate and Sodium chloride
Answer» B. Sodium chloride
Discussion
140.

mongst \[LiCl,\ RbCl,\ BeC{{l}_{2}}\] and \[MgC{{l}_{2}}\]the compounds with the greatest and least ionic character respectively are [Pb. CET 2004]

A. \[LiCl\] and \[RbCl\]
B. \[MgC{{l}_{2}}\]and \[BeC{{l}_{2}}\]
C. \[RbCl\] and \[BeC{{l}_{2}}\]
D. \[RbCl\] and \[MgC{{l}_{2}}\]
Answer» D. \[RbCl\] and \[MgC{{l}_{2}}\]
Discussion