NCERT Solutions for Class 9 Science Chapter 3
Atoms And Molecules
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Exercises Questions
Page No-44
Questions No- 4
Write the chemical formulae of the following.
(a) Magnesium chloride
(b) Calcium oxide
(c) Copper nitrate
(d) Aluminum chloride
(e) Calcium carbonate.
(a) Magnesium chloride →MgCl2
(b) Calcium oxide →CaO
(c) Copper nitrate →Cu(NO3)2
(d) Aluminium chloride →AlCl3
(e) Calcium carbonate →CaCO3
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(a) Magnesium chloride: (MgCl2)
(b) Calcium oxide: (CaO)
(c) Copper nitrate: (Cu(NO3)2)
(d) Aluminum chloride: (AlCl3)
(e) Calcium carbonate: (CaCO3)
These chemical formulas represent the combinations of atoms in each compound. For instance, magnesium chloride consists of one magnesium atom (Mg) and two chlorine atoms (Cl2 ) bonded together, forming the compound (MgCl2). Similarly, the other compounds listed have their respective combinations of elements represented in their chemical formulas.