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Q.

If Cs+O2g     CO2g,   H=X  and  COg+1/2O2g     CO2g,   H=Y,  then the heat of formation of CO is

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a

X + Y

b

X - Y

c

Y - X

d

XY

answer is B.

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Detailed Solution

Cs+O2g     CO2g,   H=X        ....(1)

COg+1/2O2g     CO2g,   H=Y      ....(2) 

Subtracting equation (2) from equation (1), we get

Cs+12O2g     COg=0

or  Cs+12O2g     COg,   H=X-Y  H=X-Y= HfCO-0+0 H4CO = X-Y

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If Cs+O2g   →  CO2g,   ∆H=X  and  COg+1/2O2g   →  CO2g,   ∆H=Y,  then the heat of formation of CO is