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Question

A compound contains atoms of three elements A,B And C. If the oxidation number of A is +2, B Is +5 and that Of C Is −2, the possible formula of the compound is


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Solution

Step 1: Given

The oxidation numbers of the elements, A, B, C are +2,+5and2 respectively.

Step 2: Deriving possible formulae of compound

The formula of a compound with elements A, B, and C will be of the form

AxByCz

where x,y, and z are the atomicities of individual atoms respectively.

Step 3: Formula used

A compound is always neutral, so the oxidation number of the compound is zero.

Hence, the net oxidation number of the individual atoms is zero.

Hence calculating in a similar way,

=(+2)(x)+(+5)(y)+(-2)(z)=0=2x+5y-2z=0

Step 4: Applying the hit and trial method for the deriving formula for the compound

Restricting it to conditions that the maximum oxidation state could be +8or3, by the Hit and Trial method, the possible solutions of (x,y,z) could be (1,2,6)or(3,2,8).

Both the sets are possible as the elements are unknown.

Hence the compounds are

A(BC3)2andA3B2C8


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