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Q.

Mean bond enthalpy of C-H in CH4 is  X Kj/mole.Heat of Atomization of   CH4 is Y Kj/mole. Correct relation is 

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a

X=4Y

b

X+Y=4

c

Y=4X  

d

Y=X

answer is C.

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Detailed Solution

For poly atomic molecules ; Mean bond enthalpy =Heat of Atomisation of molecule Total number of similar types of bonds; CH4gCH3g+Hg...H1=q1; CH3gCH2g+Hg...H2=q2; CH2gCHg+Hg.....H3=q3;   CHgCg+Hg.......H4=q4 ; Average of the above reactions is mean bond enthalpy; Mean bond enthalpyX= q1+q2+q3+q44;....1 CH4gCg+4Hg...Hatm=q1+q2+q3+q4; Net H is called enthalpy of atomization='Y' ;....2 Comparing 1 and 2 X=Y4;   

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