In the tryptophan operon, tryptophan serves as ________________.

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#Question id: 20134

#XL - P Chemistry

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: 20135

#XL - P Chemistry

Calculate ΔH at 358 K for the reaction

Fe2O3(s) + 3H2(g) → 2Fe (s) + 3H2O(l)

Given that, DH298= – 33.29 kJ mole^–1 and Cp for Fe₂O₃ (s), Fe (s), H₂O (l) and H₂ (g) are

103.8, 25.1, 75.3 and 28.8 J/K mole.

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#Question id: 20136

#XL - P Chemistry

Ka for CH3COOH at 25ºC is 1.754 × 10^–5 . At 50ºC, Ka is 1.633 × 10^–5 What will be value of Δ Sº for the ionisation of CH3COOH?

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#Question id: 20137

#XL - P Chemistry

If uncertainty in position and velocity are equal then uncertainty in momentum will be

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#Question id: 20138

#XL - P Chemistry

Number of waves made by a Bohr electron in one complete revolution in its fourth orbit is

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#Question id: 20139

#XL - P Chemistry

Which of the following electronic transitions require that the greatest amount of energy be absorbed by a hydrogen atom?