Question

Q4] Write the names and symbols of the constituent elements and identify their
valencies from the molecular formulae given below. [02]
Ans4]​

Answer 1

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.