Q4] Write the names and symbols of the constituent elements and identify their
valencies from the molecular formulae given below. [02]
Ans4]
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Answer:
Compounds Name of compounds Symbol of constituent element Valency of constituent elements
KCl Potassium chloride K,Cl K=1,Cl=1
HBr Hydrogen bromide K,Br K=1,Br=1
MgBr
2
Magnesium bromide Mg,Br Mg=2,Br=1
K
2
O Potassium oxide K,O K=1,O=2
NaH Sodium hydride Na,H Na=1,H=1
CaCl
2
Calcium chloride Ca,Cl Ca=2,Cl=1
CCl
4
Carbon tetrachloride C,Cl C=4,Cl=1
HI Hydrogen iodide H,I H=1,I=1
H
2
S Hydrogen sulphide H,S H=1,S=2
Na
2
S Sodium sulphide Na,S $Na = 1, S = 2$$
FeS Iron(II) Sulfide Fe,S F=2,S=2
BaCl
2
Barium chloride Ba,Cl B=2,Cl=1
Explanation:
Hope this answer will help you.
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