Explore topic-wise MCQs in Chemistry.

This section includes 279 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.

1.

The metal constituent of chlorophyll is

A. Iron
B. Potassium
C. Manganese
D. Magnesium
Answer» E.
Discussion
2.

Which one of the following has coloured ion ?

A. Cu
B. Ag
C. Zn
D. Ni
Answer» E.
Discussion
3.

The oxidation state of chromium in K2 Cr2 O7 is

A. +6
B. +3
C. +7
D. +4
Answer» B. +3
Discussion
4.

Copper pyrites (CuFeS2) are concentrated by

A. electromagnetic method
B. gravity method
C. froth floatation method
D. all of above methods
Answer» D. all of above methods
Discussion
5.

The oxidation number of Fe in Fe3O4 is

A. +2
B. 2/3
C. +3
D. 8/3
Answer» E.
Discussion
6.

Corrosion is basically an

A. interaction
B. union between light metal and heavy metal
C. electrochemical phenomenon
D. altered reaction in presence of H
E. O
Answer» D. altered reaction in presence of H
Discussion
7.

Which of the following is largest ?

A. CI
B. S
C. Na
D. None of these
Answer» B. S
Discussion
8.

The nature of an aqueous solution of FeCl2 is

A. basic
B. acidic
C. amphoteric
D. neutral
Answer» C. amphoteric
Discussion
9.

A certain metal M is used to prepare an antacid, which is used as a medicine for acidity. This metal accidently catches fire, which can not be extinguished by using CO2 based extinguishers. The metal M is

A. Mg
B. Ba
C. Be
D. Ca
Answer» B. Ba
Discussion
10.

MgCI2. 6H2 O, when heated, gives

A. magnesium hydride
B. magnesium chloride
C. magnesium oxide
D. magnesium oxchloride
Answer» C. magnesium oxide
Discussion
11.

The process of converting hydrate Al2O3 into anhydrous aluminium is known as

A. Smelting
B. Roasting
C. Calcination
D. Dressing
Answer» D. Dressing
Discussion
12.

Mond's process is used for preparing

A. Ni
B. H
C. SO
D. NH
E. HNO
Answer» B. H
Discussion
13.

Which of the following is not efflorescent ?

A. CuSO
B. NaOH
C. Na
D. SO
E. MgSO
Answer» C. Na
Discussion
14.

Lunar caustic is

A. NaOH
B. NaNO
C. AgNO
D. Ag
E. SO
Answer» D. Ag
Discussion
15.

The second most common element in the universe is

A. H
B. N
C. O
D. Si
Answer» E.
Discussion
16.

The element with electronic configuration 3a5 4s1 is

A. Metalloid
B. Non-metal
C. Tansition metal
D. Noble gas
Answer» D. Noble gas
Discussion
17.

In the extraction of silver, Ag2S is dissolved in

A. HNO
B. H
C. SO
D. HCI
E. KCN
Answer» E. KCN
Discussion
18.

The purple colour of [Ti(H2O)6]3+ ion due to

A. Ttransfer of an electron
B. Intermolecular vibrations
C. Presence of water molecules
D. Unpaired d-electron
Answer» E.
Discussion
19.

Which of the following is known as salt peter ?

A. NaCI
B. KNO
C. Na
D. CO
E. NaHCO
Answer» C. Na
Discussion
20.

Match the List-I (compound) with List-II (chemical name) and select the correct answer using the codes given below the ListsList-I (Compound)List-II (Chemical name)F. Bleaching powder1.Calcium oxychlorideG. Gypsom2.Calcium sulphateH. Marble3.Calcium carbonateCodesFGHA.123B.231C.132D.213

A. A.
B. B.
C. C.
D. D.
Answer» B. B.
Discussion
21.

Which of the following gases is evolved when curpric sulphide (CuS) is dissolved in dilute hydrochloric acid (HCI)

A. S
B. Cl
C. H
D. S
E. H
Answer» D. S
Discussion
22.

Which of the following ion is diamagnetic here ?

A. Cu
B. Zn
C. Sc
D. All of these
Answer» E.
Discussion
23.

Which of the following ion is colourless ?

A. Cu
B. Ni
C. Fe
D. Fe
Answer» B. Ni
Discussion
24.

Consider the following statements1. Baking soda is used in fire extinguishers2. Quick lime is used in the manufacture of glass3. Gypsom is used in manufacture of plaster of parisWhich of the statements given above is/are correct ?

A. 1 and 2
B. 2 and 3
C. 1 only
D. 1, 2 and 3
Answer» E.
Discussion
25.

Calcium decomposes cold water into

A. Ca(OH)
B. CaH
C. O
D. CaO
Answer» B. CaH
Discussion
26.

Which of the following metal ions plays an important role in the muscle contraction ?

A. Na
B. K
C. Mg
D. Ca
Answer» E.
Discussion
27.

Which of the following is corrosive sublimate ?

A. HgBr
B. HgCl
C. Hg
D. Cl
E. HgSO
Answer» C. Hg
Discussion
28.

In Nessler's reagent, the ion present is

A. HgI
B. HgI
C. Hg
D. Hg
Answer» E.
Discussion
29.

Calcium decomposes water and liberates

A. H
B. O
C. CaO
D. CaO
Answer» B. O
Discussion
30.

Match the followingList-IList-IIF. AI1.HaematiteG. Ag2.CryoliteH. Fe3.CassiteriteJ. Iron4.ArgentiteCodes :FGHJA.2431B.3214C.4213D.2341

A. A.
B. B.
C. C.
D. D.
Answer» B. B.
Discussion
31.

MnO-4 on reduction in acid medium forms

A. MnO
B. MnO
C. Mn
D. Mn
Answer» E.
Discussion
32.

The molecular formula of chromyl chloride is

A. CrO
B. Cl
C. CrOCl
D. CrCl
E. CrCl
Answer» B. Cl
Discussion
33.

Which of the following is highly corrosive salt ?

A. FeCl
B. HgCl
C. PbCl
D. Hg
E. Cl
Answer» C. PbCl
Discussion
34.

Which one of the following does not participate in Solvey's process for the manufacture of Ma2CO3 ?

A. CO
B. NH
C. H
D. SO
E. NaCl
Answer» D. SO
Discussion
35.

The aqueous solution containing which one of the following ions will be colourless ?

A. SC
B. Fe
C. Fe
D. Mn
Answer» B. Fe
Discussion
36.

Pyrolusite is

A. MnO
B. Mn
C. O
D. MnO
E. SnO
Answer» D. MnO
Discussion
37.

Match the followingList-IList-IIF. Zn1.AmalagamationG. Ag2.Self reductionH. Fe3.Carbon reductionJ. Ca4.carbon monoxide reductionK. Cu5.Fused salt electroysisCodes :FGHJKA.31452B.24315C.51243D.53421

A. A.
B. B.
C. C.
D. D.
Answer» B. B.
Discussion
38.

March the List-I with List-II and select the correct answer using the codes given below the ListsList-I (Mineral)List-II (Industries in which largely used)F. Lime stone1.CementG. Copper2.Electrical goodsH. Bauxite3.Manufacture aeroplanesJ. Manganese4.SteelCodesFGHJA.1234B.2314C.4321D.3412

A. A.
B. B.
C. C.
D. D.
Answer» B. B.
Discussion
39.

Which of the following is used in making ointment for curing skin disease ?

A. ZnCO
B. ZnSO
C. ZnO
D. ZnS
Answer» B. ZnSO
Discussion
40.

When sodium bicarbonate is heated the product obtained is

A. Na
B. NaCO
C. NaHCO
D. Na
E. OC
Answer» E. OC
Discussion
41.

Which of the following compounds is used as a yellow pigment in making oil and water colours ?

A. Cd
B. O
C. CdS
D. Cd(OH)
E. CdO
Answer» C. CdS
Discussion
42.

Gold dissolves in aqua regia to produce

A. AuCl
B. HAuCl
C. HauCl
D. [Au(CN)
E. ]
Answer» C. HauCl
Discussion
43.

Which of the following alkaline earth metals has the highest ionic mobility in an aqueous solution ?

A. Ba
B. Mg
C. Ca
D. Be
Answer» B. Mg
Discussion
44.

Consider the following elements1. cobalt2. phosphorous3. ZincWhich of the above elements are required for the maintaining healthy human body ?

A. 1 and 2
B. 2 and 3
C. 1 and 3
D. 1, 2 and 3
Answer» E.
Discussion
45.

Match the List-I with List-II and select the correct answer using the codes given below the ListsList-IList-IIF. German silver1.TinG. Solder2.NickelH. Bleachin powder3.SodiumJ. Hypo4.ChlorineCodes :FGHJA.1243B.2134C.1234D.2143

A. A.
B. B.
C. C.
D. D.
Answer» E.
Discussion
46.

Match the List-I with List-II and select the correct answer using the codes given below the ListsList-IList-IIF. Potassium bromide1.FertiliserG. Potassium nitrate2.PhotographyH. Potassium sulphate3.BakeryJ. Monopotassium tartarate4.GunpowderCodes :FGHJA.2413B.2431C.4231D.4213

A. A.
B. B.
C. C.
D. D.
Answer» B. B.
Discussion
47.

Which of the following is obtained when cadmium chloride is treated with water ?

A. CdCl
B. Cd(OH)
C. CdO
D. Cd
E. O
Answer» C. CdO
Discussion
48.

Which of the following is formed when cadmium reacts with H2S ?

A. CdS
B. CdS
C. CdH
D. Cd
E. S
Answer» B. CdS
Discussion
49.

The nature of aqueous solution of FeCl3 is

A. Neutral
B. Basic
C. Amphoteric
D. Acidic
Answer» E.
Discussion
50.

The mixture of MgCl2 and MgO is called

A. Pseudo alum
B. Sorel's cement
C. Portland cement
D. Alum
Answer» C. Portland cement
Discussion