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Question

(Ex.Q.5)
Write the names and symbols of the constituent elements and identify their valencies from the molecular formulae given below.

CaCl2, CCl4, HI, H2S, Na2S,

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Solution

Compounds Name of compounds Symbol of constituent elements Valency of constituent elements
CaCl2 Calcium chloride Ca, Cl Ca = 2, Cl = 1
CCl4 Carbon tetrachloride C, Cl C = 4, Cl = 1
HI Hydrogen iodide H, I H = 1, I = 1
H2S Hydrogen sulphide H, S H = 1, S = 2
Na2S Sodium sulphide Na, S Na = 1, S = 2

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