XeF4 has a shape of from Chemistry JEE Year 2010 Free Solved Pre

Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Electronic configuration of H+ is

  • 1s0

  • 1s1

  • 1s2

  • 1s1, 2s1


2.

From the given sets of quantum numbers, the one that is inconsistent with the theory is

  • n =3; l =2; m = -3; s = +12

  • n = 4; l = 3; m = 3; s = +12

  • n = 2; l = 1; m = 0; s = -12

  • n = 4; l = 3; m = 2; s = +12


3.

Pick out the isoelectronic structures from the following

CH3+I  H3O+II  NH3III  CH3-IV

  • I and II

  • I and IV

  • I and III

  • II, III and IV


4.

Which of the following species is paramagnetic?

  • CN-

  • NO

  • O22-

  • CO


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5.

XeF4 has a shape of

  • spherical

  • trigonal bipyramidal

  • square planar

  • tetrahedral


C.

square planar

XeF4 = 4 bp + 2 lp = sp3d2 hybridisation

Thus, the structure of XeF4 should be octahedral but its geometry becomes square planar due to the presence of two lone pairs of electrons as


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6.

1f 20 mL of 0.4 N NaOH solution completely neutralises 40 mL of a dibasic acid, the molarity of the acid solution is

  • 0.1 M

  • 0.2 M

  • 0.3 M

  • 0.4 M


7.

Molality of a solution is equal to

  • number of moles of solutenumber of litres of solution

  • number of g-equivalents of solutenumber of litres of solution

  • number of moles of solutenumber of kilogram of solvent

  • number of moles of a componenttotal number of moles of all components


8.

In the following particle

3Li6 + ? → 2He41H3

the missing particle is

  • electron

  • neutron

  • proton

  • deuteron


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9.

Consider the two gaseous equilibria involving SO2 and the corresponding equilibrium constants at 298 K

SO2 (g) + 12O2 (g)  SO3 (g); K1

2SO3 (g)  2SO2 (g) + O2 (g); K2

The values of the equilibrium constants are related by

  • K2 = K1

  • K2 = K12

  • K21K12

  • K21K1


10.

For the reaction,

A + B  C + D,

the initial concentrations of A and B are equal. The equilibrium concentration of C is two times the equilibrium concentration of A. The equilibrium constant is

  • 4

  • 14

  • 9

  • 19


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