Cell reaction is spontaneous, when from Chemistry JEE Year 2008

Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

An isobar of 20C40 is

  • 18Ar40

  • 20Ca38

  • 20Ca42

  • 18Ar38


2.

In successive emission of α-and β-particles, the number of α-and β-particles should be emitted for the conversion of 92U238 to 82P206 are

  • 7α, 5β

  • 6α, 4β

  • 4α, 3β

  • 8α, 6β


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3.

Cell reaction is spontaneous, when

  • Ered° is negative

  • Ered° is positive

  • G° is negative

  • G° is positive


C.

G° is negative

G = H - TSFor a spontaneous celll reaction, H  should be negative and S  should be positive. Hence, G should be negative.


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4.

If E  is the heat of reaction for

C2H5OH(l) + 3O2(g)  2CO2(g) + 3H2O(l) at constant volume, the H (heat of reaction at constant pressure), at constant temperature is

  • H = E + RT

  • H = E - RT

  • H = E - 2RT

  • H = E + 2RT


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5.

Which one of the following species acts as both Bronsted acid and base?

  • H2PO2-

  • HPO32-

  • HPO42-

  • All of these


6.

If C(s) + O2(g)  CO(g); H = r  and CO(g) + 12O2(g)  CO2(g); H =s  then, the heat of formation of CO is

  • r+s

  • r-s

  • s-r

  • rs


7.

Which of the following concentration factors is affected by change in temperature?

  • Molarity

  • Molality

  • Mole fraction

  • Weight fraction


8.

Which of the following has the maximum penetrating power ?

  • α- particle

  • γ-particles

  • Proton

  • Positron


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9.

Solubility of Ca(OH)2 is s mol L-1. The solubility product (Ksp) under the same condition is

  • 4s3

  • 3s4

  • 4s2

  • s3


10.

The pH of a 0.1 M solution of NH4OH (having Kb =1.0 x 10-5) is equal to

  • 10

  • 6

  • 11

  • 12


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