Deduce the molecular formulae of the compound obtained from the following pairs ofelements by the cross multiplication method.A. C (Valency 4) & CI (Valency 1)B. N (Valency 3) & H (Valency 1)\C. C (Valency 4) & O (Valency 2)D. Ca (Valency 2) & O (Valency 2)
Question
Deduce the molecular formulae of the compound obtained from the following pairs ofelements by the cross multiplication method.A. C (Valency 4) & CI (Valency 1)B. N (Valency 3) & H (Valency 1)\C. C (Valency 4) & O (Valency 2)D. Ca (Valency 2) & O (Valency 2)
Solution
A. C (Valency 4) & Cl (Valency 1) Cross multiply the valencies of the two elements. The valency of C is 4 and the valency of Cl is 1. Therefore, the molecular formula of the compound formed by C and Cl is CCl4.
B. N (Valency 3) & H (Valency 1) Cross multiply the valencies of the two elements. The valency of N is 3 and the valency of H is 1. Therefore, the molecular formula of the compound formed by N and H is NH3.
C. C (Valency 4) & O (Valency 2) Cross multiply the valencies of the two elements. The valency of C is 4 and the valency of O is 2. Therefore, the molecular formula of the compound formed by C and O is CO2.
D. Ca (Valency 2) & O (Valency 2) Cross multiply the valencies of the two elements. The valency of Ca is 2 and the valency of O is 2. Therefore, the molecular formula of the compound formed by Ca and O is CaO.
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