For endothermic reaction : from Chemistry NEET Year 2009 Free So

Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

The concentration of Ag+ ion in a given saturated solution of AgCl at 25°C is 1.06 x 10-5 g ion L-1 .Thus , the solubility product of AgCl is :

  • 0.453 x 10-10

  • 0.530 x 10-10

  • 1.12 x 10-10

  • 2.12 x 10-10


2.

Heat of combustion of C and CO are -394 and -285 kJ respectively , so heat of formation of CO in kJ/mol is :

  • - 218

  • - 109

  • + 109

  • + 218


3.

The product formed is an isobar , if there is :

  • α emission

  • β emission

  • α and 1 β emission

  • α and 2 β emission


4.

Solution of 0.l N NH4OH and 0.1 N NH4Cl has pH 9.25. Then , pKb of NH4OH is :

  • 9.75

  • 4.75

  • 3.75

  • 8.25


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5.

How many grams of CO2 will be produced by the complete combustion of 2 moles of ethanol ?

  • 132 g

  • 44 g

  • 176 g

  • 88 g


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6.

For endothermic reaction :

  • Ea > Ea'

  • Ea = Ea'

  • Ea < Ea'

  • None of these


A.

Ea > Ea'

If the potential energy ofthe products is greater than that of the reactants , the energy released in going from the activated complex to products will be less than the activation energy and reaction willbe endothermic .

A + B Ea [AB]activated complex Ea'

Ea > Ea'


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7.

Which of the following changes with change in temperature ?

  • Mole fraction

  • Formality

  • % (w/W)

  • Molality


8.

When Al1327 is bombarded with α - particle , a radioactive isotope of phosphorus P1530 is formed .Which particle is emitted along with P1530 ?

  • Deuteron

  • Proton

  • Electron

  • Neutron


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9.

The difference between heat of reaction at constant pressure and constant volume of the reaction :

2C6H6 (l) + 15O2 (g)  12CO2 + 6H2O (l)

at 25°C (in kJ) is :

  • - 7.43

  • 3.72

  • - 3.72

  • 7.43


10.

For which reaction will H - E = 0 ? Assume that each reaction is carried out in an open container .

  • 2CO2 (g) + O2 (g)  2CO2 (g)

  • PCl5 (g)  PCl3 (g) + Cl2 (g)

  • H2 (g) + Br2 (g)  2HBr (g)

  • C (s) + 2H2O (g)  2H2 (g) + CO2 (g)


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