A compound is formed when elements X and Y chemically c
| A compound is formed when elements X and Y chemically combine with each other. X has a valency of 6 and Y has a valency of 4. The molecular formula of the compound will be _______.
A. X6Y4
B. X4Y6
C. X3Y2
D. X2Y3
Please scroll down to see the correct answer and solution guide.
Right Answer is: D
SOLUTION
The molecular formula of a compound is derived from the symbols and valancies of its constituting elements using criss cross method, a short-cut method, as shown below.
Symbol: X Y
↘↙
Valency: 6 4
From the above method, the formula obtained for the compound is X4Y6. This is simplified by taking whole number ratio of the valencies. Thus, molecular formula of the given compound is written as X2Y3.