27. In the hydrogenation of double bonds, a catalyst is needed. In the first ste

Question

27. In the hydrogenation of double bonds, a catalyst is needed. In the first step, the reactants must come into contact with a metal surface. This step is known as A. adsorption B. diffusiorn C. reaction D. desorption E. none of the above 28. Give the direction of the reaction, if K A. The forward reaction is favored. B. The reverse reaction is favored. C. Neither direction is favored. D. If the temperature is raised, then the forward reaction is favored. E. If the temperature is raised, then the reverse reaction is favored. 29. Express the equilibrium constant for the following reaction. 2 CH3CI(g)+ Cl2 (g)- 2 CH2CI2 (2) + H2 (g) A, K = [CH2Cl2][H2] CH3CICI2 CHCI2 CH2CI2121H2l 30. In which of the following reactions will KC-Kp? A. H2(g)+12(g) 2HI(g) B. CH4(g)+H20(g) CO(g) +3 H2(g) C. N204(g) ? 2NO2(g) D. CO(g)-2H2(g) ? CH3OH(g) E. N2(g) + 3 H2(g) 2 NH3(g)

Explanation / Answer

27)

The correct answer is Option A (adsorption)

Reactants come in contact with metal at the time of adsorption

28)

If the reactoin K>>1, which means

K = [Products]/[Reactants]

It timplies products concentration is way higher than the reactants concentration

Hence the correct answer is Option A

29)

For a generic reaction

aA + bB ---- cC + dD

Rate = [Products]/[Reactants] = [D]^d * [C]^c/([A]^a * [B]^b)

K = [Products]/[Reactants] = [CH2Cl2]^2 * [H2]/ (CH3Cl]^2 * [Cl2])

Hence correct answer is Option B

30)

Kp = Kc(RT)^(change in moles)

Change in moles = Moles of Products - Moles of reactants

For the reaction A, 2 moles of Hi is formed with one mole of H2 and one mole of I2

Change in moles = 2 - (1+1) = 0

Hence Kp = Kc for this reaction

Correct answer is Option A

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