The ionic radii (in Å) of N3–, O2– and F– are respectivel

Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

The molecular formula of a commercial resin used for exchanging ions in water softening is C8H7SO3Na ( mol. wt = 206). What would be the maximum uptake of Ca2+ ions by the resin when expressed in mole per gram resin?

  • 1/103

  • 1/206

  • 2/309

  • 2/309

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2.

Which of the following is the energy of a possible excited state of hydrogen?

  • +13.6 eV

  • -6.8 eV

  • -3.4 eV

  • -3.4 eV

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3.

The intermolecular interaction that is dependent on the inverse cube of the distance between the molecule is:

  • ion-ion interaction

  • ion-dipole interaction

  • London force

  • London force

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4.

The following reaction is performed at 298 K
2NO(g) + O2 (g) ⇌ 2NO2 (g)
The standard free energy of formation of NO (g) is 86.6 kJ/mol at 298 K. What is the standard free energy of formation of NO2 (g) at 298 K? (KP = 1.6 x 1012)

  • R (298) In (1.6 x 1012)-86600

  • 86600 + R (298) In (1.6 x 1012)

  • 86600 - In(1.6 x 1012)/R(298)

  • 86600 - In(1.6 x 1012)/R(298)

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5.

The standard Gibbs energy change at 300 K for the reaction, 2A  ⇌ B +C is 2494.2J at a given time, the composition of the reaction mixture isleft square bracket straight A right square bracket space equals space 1 half comma space left square bracket straight B right square bracket space equals 2 and left square bracket straight C right square bracket space equals space 1 half, The reaction proceeds in the [R= 8.314 JK/mol, e = 2.718]

  • forward direction because Q>Kc

  • reverse direction because Q>Kc

  • forward direction because Q < Kc

  • forward direction because Q < Kc

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6.

The ionic radii (in Å) of N3–, O2– and F are respectively:

  • 1.36, 1.40 and 1.71

  • 1.36, 1.71 and 1.40

  • 1.71, 1.40 and 1.36

  • 1.71, 1.40 and 1.36


C.

1.71, 1.40 and 1.36

Number of electrons in N3- = 7+3 = 10
Number of electrons in O2- = 8+2 = 10
Number of electrons in F- = 9+1 = 10
Since, all the three species have each 10 electrons hence they are isoelectronic species.
It is considered that, in case of isoelectronic species as the negative charge increase, ionic radii increase and therefore the value of ionic radii are

N3- = 1.71 (highest among the three)
O2- = 1.40
F- = 1.36 (lowest among the three)

N3- > O2-> F-



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7.

In Carius method of estimation of halogens, 250 mg of an organic compound gave 141 mg of AgBr. The percentage of bromine in the compound is: (at. Mass Ag = 108; Br = 80)

  • 24

  • 36

  • 48

  • 48

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8.

From the following statements regarding H2O2, choose the incorrect statement:

  • It can act only as an oxidising agent

  • It decomposed on exposure to light

  • It has to be stored in plastic or wax lined glass bottles in dark

  • It has to be stored in plastic or wax lined glass bottles in dark

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9.

Which one of the following alkaline earth metal sulphates has its hydration enthalpy greater than its lattice enthalpy?

  • CaSO4

  • BeSO4

  • BaSO4

  • BaSO4

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10.

Sodium metal crystallises in a body centred cubic lattice with a unit cell edge of 4.29 Å The radius of sodium atom is approximate:

  • 1.86 Å

  • 3.22Å

  • 5.72 Å

  • 5.72 Å

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