Chemistry
Correct the following statements.
(a) A molecular formula represents an element.
(b) Molecular formula of water is H2O2.
(c) A molecule of sulphur is monoatomic.
(d) CO and Co both represent cobalt.
(e) Formula of iron (III) oxide is FeO.
Chemical Formula
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Answer
(a) A molecular formula represents the molecule of an element or of a compound.
(b) Molecular formula of water is H2O.
(c) A molecule of sulphur is octatomic.
(d) CO represents Carbon Monoxide and Co represents cobalt.
(e) Formula of iron (III) oxide is Fe2O3.
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Related Questions
Fill in the blanks:
(a) Dalton used symbol …………… for oxygen and …………… for hydrogen.
(b) Symbol represents …………… atom of an element.
(c) Symbolic expression for a molecule is called …………… .
(d) Sodium chloride has two radicals. Sodium is a …………… radical while chloride is a …………… radical.
(e) Valency of phosphorus in PCl3 is …………… and in PCl5 is …………… .
(f) Valency of Iron in FeCl2 is …………… and in FeCl3 it is …………… .
(g) Formula of iron (III) carbonate is …………… .
Name the following compounds and state how many atoms of each kind are present in one molecule of these compounds.
(a) H2SO4
(b) HClO4
(c) K2Cr2O7
(d) KMnO4
(e) K4[Fe(CN)6]
(f) Na2CrO4
(g) Mn3(BO4)2
(h) HNO2
Give the empirical formula of :
- Benzene (C6H6)
- Glucose (C6H12O6)
- Acetylene (C2H2)
- Acetic acid (CH3COOH)
Complete the following table.
Acid Radicals →
Basic Radicals ↓Chloride Nitrate Sulphate Carbonate Hydroxide Phosphate Magnesium MgCl2 Mg(NO3)2 MgSO4 MgCO3 Mg(OH)2 Mg3(PO4)2 Sodium Zinc Silver Ammonium Calcium Iron (II) Potassium