Calculate the heat of formation of benzene from the following data, assuming no resonance. Bond energies :

C – C = 83 kcal = 140 kcal C – H = 99 kcal

Heat of atomisation of C = 170 .9 kcal

Heat of atomisation of H = 52.1 kcal

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#Question id: 20181

#XL - P Chemistry

Rutherford’s atomic model suggests the existence

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#Question id: 20182

#XL - P Chemistry

Which is not true with respect to cathode rays?

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#Question id: 20183

#XL - P Chemistry

A element M has an atomic mass 19 and atomic number 9. Its ion is represented by

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#Question id: 20184

#XL - P Chemistry

Which of the following ions has the maximum magnetic moment ?

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#Question id: 20185

#XL - P Chemistry

The value of the energy for the first excited state of hydrogen will be

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#Question id: 20186

#XL - P Chemistry

In hydrogen atom, energy of first excited state is -3·4 eV. Find out the K.E. of the same orbit of hydrogen atom