When compared to ΔG° for the formation of Al2O3, the &D

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 Multiple Choice QuestionsMultiple Choice Questions

191.

Which of the following is an intensive property?

  • temperature

  • viscosity

  • surface tension

  • all of these


192.

In equilibrium state the value of G is

  • zero

  • negative

  • positive

  • may be negative or positive


193.

One mole of which of the following has the highest entropy?

  • Liquid nitrogen

  • Hydrogen gas

  • Mercury

  • Diamond


194.

Entropy of the universe is

  • constant

  • zero

  • continuously decreasing

  • continuously increasing


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195.

The relation between H and U is

  • H = U + RT

  • H = U - nRT

  • H = U + nRT

  • U = H + nRT


196.

In which of the following process, maximum increase in entropy is observed?

  • Melting of ice

  • Sublimation of napthalene

  • Condenstaion of water

  • Dissolution of salt in water


197.

Considering the reaction C (s) + O2 (g) → CO2 (g) + 393.5 kJ the signs of H, S and G respectively are

  • +, -, -

  • -, +, +

  • -, -, -

  • -, +, -


198.

If one mole of ammonia and one mole of hydrogen chloride are mixed in a closed container to form ammonium chloride gas, then

  • ΔH > ΔU

  • ΔH = ΔU

  • ΔH < ΔU

  • there is no relationship


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199.

When compared to ΔG° for the formation of Al2O3, the ΔG° for the formation of Cr2O3 is

  • higher

  • lower

  • same

  • unpredicted


A.

higher

Between Al2Oand Cr2O3, Al2O3 is more stable so its ease of formation is high i.e, ΔG° is negative or less than that of Cr2O3.

Hence, ΔG°  of Cr2O> ΔG°  of Al2O3


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200.

Consider the Born-Haber cycle for the formation of an ionic compound given below and identify the compound (Z) formed.

 

  • M+X-

  • M+X-(s)

  • MX

  • M+X-(g)


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