125 Important Chemical Formulas of Compounds- For Class 9,10,11,12 & Competitive Exams

Chemical formulas of compounds are one of the most important topics in school chemistry and competitive exams. Students of Class 9, Class 10, Class 11 are asked to write the correct chemical formula of common salts, acids, bases, oxides and organic compounds in exams. Learning these formulas helps in understanding chemical reactions, balancing equations and performing laboratory experiments. In this post you will find 125 important chemical formulas of compounds arranged in easy to revise table and useful for quick revision before exams.

This list covers the chemical formulas of important acids, bases, salts, oxides and organic compounds that are commonly asked in board exams and competitive examinations.

Chemical Formulas of Acids

S.N.	Acids	Formula
1	Sulphuric acid	H2SO4
2	Nitric acid	HNO3
3	Carbonic acid	H2CO3
4	Acetic acid	CH3COOH
5	Nitrous acid	HNO2
6	Hydrochloric acid	HCl

 

Chemical Formulas of Bases

 

S.N.	Bases	Formula
1	Sodium hydroxide	NaOH
2	Potassium hydroxide	KOH
3	Calcium hydroxide	Ca(OH)2
4	Magnesium hydroxide	Mg(OH)2
5	Ammonium hydroxide	NH4OH
6	Aluminium hydroxide	Al(OH)3

 

Chemical Formulas of Salts

S.N.	Bases	Formula
1	Sodium chloride	NaCl
2	Calcium carbonate	CaCO3
3	Sodium carbonate	Na2CO3
4	Sodium hydrogen carbonate	NaHCO3
5	Copper sulphate	CuSO4
6	Zinc sulphate	ZnSO4

 

Chemical Formulas of Oxides

S.N.	Bases	Formula
1	Carbon dioxide	CO2
2	Carbon mono oxide	CO
3	Sulphur dioxide	SO2
4	Sulphur trioxide	SO3
5	Magnesium oxide	MgO
6	Aluminium oxide	Al2O3

 

Chemical Formulas of Organic Compounds

S.N.	Bases	Formula
1	Methane	CH4
2	Ethane	C2H6
3	Ethyl alcohol	C2H5OH
4	Methanol	CH3OH
5	Benzene	C6H6
6	Chloroform	CHCl3

S.N.	Name of chemical compound	Chemical formula
1	Ammonium hydrogen carbonate	NH4HCO3
2	Mercuric chloride	HgCl2
3	Aluminium hydroxide	Al(OH)3
4	Sodium  silicate	Na2SiO3
5	Zinc sulphate heptahydrate	ZnSO4.7H2O
6	Ammonium sulphate	(NH4)2SO4
7	Ammonium nitrate	NH4NO3
8	Ammonium chloride	NH4Cl
9	Ammonium carbonate	(NH4 )2CO3
10	Ammonium phosphate	(NH4)3PO4
11	Magnesium Nitrate	Mg(NO3)2
12	Lithium Oxide	Li2O
13	Magnesium  phosphate	Mg3(PO4)2
14	Nitrous  acid	HNO2
15	Potassium  dichromate	K2Cr2O7
16	Calcium  fluoride	CaF2
17	Barium   oxide	BaO
18	Calcium  bromide	CaBr2
19	Magnesium  bromide	MgBr2
20	Silicon  dioxide	SiO2
21	Copper  nitrate	Cu(NO3)2
22	Potassium  fluoride	KF
23	Barium  nitrate	Ba(NO3)2
24	Sodium  thiosulfate	Na2S2O3
25	Calcium  sulphate	CaSO4
26	Sulphuric  acid	H2SO4
27	Zinc   sulphate	ZnSO4
28	Magnesium  oxide	MgO
29	Ferric  oxide	Fe2O3
30	Ethyl  alcohol	C2H5OH
31	Glucose	C6H12O6
32	Calcium  hydroxide	Ca(OH)2
33	Calcium  oxide	CaO
34	Carbon  dioxide	CO2
35	Ferrous  sulphate	FeSO4
36	Sulphur  dioxide	SO2
37	Sulphur  tri-oxide	SO3
38	Lead  nitrate	Pb(NO3)2
39	Lead  oxide	PbO
40	Nitrogen  dioxide	NO2
41	Silver  chloride	AgCl
42	Silver bromide	AgBr
43	Barium  hydroxide	Ba(OH)2
44	Ammonium Nitrate	NH4NO3
45	Barium  chloride	BaCl2
46	Ammonium  hydroxide	NH4OH
47	Copper ( II) sulphate	CuSO4
48	Copper  chloride	CuCl2
49	Lead  chloride	PbCl2
50	Sodium  sulphate	Na2SO4
51	Sodium Chloride	NaCl
52	Potassium  iodide	KI
53	Potassium  chloride	KCl
54	Manganese  chloride	MnCl2
55	Hydrochloric  acid	HCl
56	Manganese  oxide	MnO2
57	Sodium  oxide	Na2O
58	Ferrous  oxide	FeO
59	Aluminium   oxide	Al2O3
60	Ferrous  chloride	FeCl2
61	Ferric  chloride	FeCl3
62	Iron  (II)  hydroxide	Fe(OH)2
63	Ammonia	NH3
64	Hydrogen  sulphide	H2S
65	Aluminium  sulphate	Al2(SO4)3
66	Aluminium Chloride	AlCl3
67	Barium  sulphate	BaSO4
68	Potassium  hydroxide	KOH
69	Nitric acid	HNO3
70	Calcium nitrate	Ca(NO3)2
71	Sodium   hydroxide	NaOH
72	Silver  nitrate	AgNO3
73	Sodium  Nitrate	NaNO3
74	Calcium  carbonate	CaCO3
75	Zinc  carbonate	ZnCO3
76	Zinc  oxide	ZnO
77	Magnesium  chloride	MgCl2
78	Carbon  monoxide	CO
79	Hydrobromic acid	HBr
80	Acetic   acid	CH3COOH
81	Magnesium  hydroxide	Mg(OH)2
82	Sodium Zincate	Na2ZnO2
83	Sodium  carbonate	Na2CO3
84	Sodium Hydrogen Carbonate	NaHCO3
85	Calcium  hydrogen carbonate	Ca(HCO3)2
86	Bleaching  powder	CaOCl2
87	Gypsum	CaSO4.2H2O
88	Plaster of Paris	CaSO4.1/2H2O
89	Lithium  chloride	LiCl
90	Sodium Aluminate	NaAlO2
91	Potassium  oxide	K2O
92	Potassium  Permangnet	KMnO4
93	Zinc sulphide	ZnS
94	Mercuric  sulphide	HgS
95	Mercuric   oxide	HgO
96	Cuprous  sulphide	Cu2S
97	Cuprous  oxide	Cu2O
98	Sodium Bromide	NaBr
99	Chloroform	CHCl3
100	Methane	CH4
101	Ethane	C2H6
102	Benzene	C6H6
103	Cyclo hexane	C6H12
104	Methanol	CH3OH
105	Carbonic  acid	H2CO3
106	Carbon  tetra chloride	CCl4
107	Sodium Acetate	CH3COONa
108	Sodium   ethoxide	CH3CH2ONa
109	Sodium iodide	NaI
110	Calcium  phosphate	Ca3(PO4)2
111	Potassium Carbonate	K2CO3
112	Calcium  hydride	CaH2
113	Magnesium  hydride	MgH2
114	Sodium Hydride	NaH
115	Sodium  sulphide	Na2S
116	Potassium  sulphide	K2S
117	Calcium  sulphide	CaS
11	Sodium Phosphate	Na3PO4
119	Potassium   phosphate	K3PO4
120	Sodium  sulphite	Na2SO3
121	Potassium  sulphite	K2SO3
122	Potassium  bromide	KBr
123	Potassium  chlorate	KClO3
124	Calcium hypochlorite	Ca(OCl)3
125	Ferric nitrate	Fe(NO3)3

Most Asked Chemical Formulas in Exams

 

These chemical formulas are very frequently asked in class 9,10,11 examinations and other competitive exams.

S.N.	Compound name	Chemical formula
1	Washing soda	Na2CO3.10H2O
2	Baking soda	NaHCO3
3	Bleaching powder	CaOCl2
4	Plaster of Paris	CaSO4.1/2H2O
5	Gypsum	CaSO4.2H2O
6	Quick lime	CaO
7	Slaked lime	Ca(OH)2
8	Common salt	NaCl
9	Ammonia	NH3
10	Methanol	CH3OH
11	Chloroform	CHCl3
12	Copper sulphate	CuSO4
13	Sulphuric acid	H2SO4
14	Nitric acid	HNO3
15	Ammonium hydroxide	NH4OH
16	Aluminium hydroxide	Al(OH)3

 

These formulas are commonly used in chemical reactions, laboratory experiments and board exams questions.