Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

The number of unpaired electrons in Fe3+ (Z = 26 ) is

  • 4

  • 5

  • 6

  • 3


2.

For n = 3 energy level, the number of possible orbitals (all kinds) are

  • 1

  • 3

  • 4

  • 9


3.

In which molecule are all atoms coplanar?

  • CH4

  • BF3

  • PF3

  • NH3


4.

Inoic bonds are usually formed by combination of elements with

  • high ionisation potential and low electron affinity

  • low ionisation potential and high electron affinity

  • high ionisation potential and high electron affinity

  • low ionisation potential and low electron affinity


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5.

The angle between two covalent bonds is maximum in

  • CH4

  • H2O

  • CO2

  • SO2


6.

If a molecule MX3 has zero dipole moment, the sigma bonding orbital used by M (At. no. 13) are

  • pure p

  • sp- hybridised

  • sp2- hybridised

  • sp3- hybridised


7.

CO2 in isostructural with

  • SnCl2

  • SO2

  • HgCl2

  • All of these


8.

In 1 mole of NaCl the proton are

  • 6 moles

  • 11 moles

  • 17 moles

  • 28 moles


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9.

The molarity of a solution made by mixing 50mL of conc. H2SO4 (36N) with 50mL of water, is

  • 36M

  • 18M

  • 9M

  • 6M


C.

9M

Molarity =a × 1000M ×Vhere, a = weight of solute b = volume of solution M = molecular weight ofsolute. Weight of solute in 50 mL 36N H2SO4 solution is 362=  a× 100098 × 50  molarity = normality2 a = 36 × 50 × 982000             .....(i)On adding 50 mL of water, volume of solution becomes 100 mL. Let us consider, molarity of solution = x x = a × 100098 × 100 a =x × 100 ×981000      .... (ii)From Eqs (i) and (ii) 36 × 50 × 982000 = a × 100 ×981000x = 9 (N)


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10.

171g of sugar cane (C12H22O11) is dissolved in 1 L of water. The molarity of the solution is

  • 2.0 M

  • 1.0 M

  • 0.5 M

  • 0.25 M


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