In the reaction, S + 32O2→ SO3

Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

The two electrons have the following set of quantum numbers, P =3,2, -2 +1/2, Q =3,0,0 + 1/2. Which of the following statement is true?

  • P and Q have same energy

  • P has greater energy than Q

  • P has lesser energy than Q

  • P and Q represent same electron


2.

0.06% (w/V) aqueous solution of urea is isotonic with

  • 0.06% glucose solution

  • 0.6% glucose solution

  • 0.01M glucose solution

  • 0.1M glucose solution


3.

Which one of the following conversion results in the change of hybridisation and geometry?

  • CH4 to C2H2

  • NH3 to N+H4

  • BF3 to BF4-

  • H2O to H3O+


4.

0.30 g of an organic compound containing C, H and oxygen on combustion yields 0.44 g of CO2 and 0.18 g of H2O. If one mole of compound weighs 60, then molecular formula of the compound is

  • CH2O

  • C3H8O

  • C4H6O

  • C2H4O2


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5.

Plot of Maxwell's distribution of velocities is given below.

Which of the following is correct about this plot?

  • T1 < T2

  • f1 > f2

  • T1> T2

  • V1 < V2


6.

The pair of compound which cannot exist together in solution is

  • NaHCO3 and NaOH

  • NaHCO3 and H2O

  • NaHCO3 and Na2CO3

  • Na2COand NaOH


7.

What amount of dioxygen (in gram) contains 1.8 × 1022 molecules?

  • 0.0960

  • 0.960

  • 9.60

  • 96.0


8.

Using MOT, compare O2+ and O2- species and choose the inncorrect option.

  • O2+ have higher bond order than O2-

  • O2- is less stable

  • O2+ is diamagnetic while O2- is paramagnetic

  • Both O2- and O2+ are paramagnetic


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9.

In the reaction, S + 32O2 SO3+ 2xkJ and SO2+ 12O2SO3+ ykJ. Heat of formation of SO2 is

  • x + y

  • x - y

  • 2x-y

  • 2x + y


C.

2x-y

After applying Hess's law on the given reactions, we can get the value of heat of formation of SO2. Hess's law states that the amount of heat evolved or absorbed in chemical change is same whether the process takes place in one step or multiple steps.

Given,S + 32O2  SO3, H1= -2xkJSO2 +  12O2  SO3, H2= -yxJS + O2  SO2, H3= -zxJFrom Hess's lawH3+H2= H1-z-y= -2x z= 2x-y


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10.

H2O2 cannot oxidise

  • PbS

  • Na2SO3

  • O3

  • KI


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