Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Which of the following will have the shape of a trigonal bipyramid?

  • PF3Cl2

  • IF5

  • BrF5

  • SbF52-


2.

The example of σ-complex is

  • Fe(η5-C5H5)2

  • [Cr(CO)6]

  • Al2(CH3)6

  • Zeiss salt


3.

The bond present in N2O5 are

  • only ionic

  • covalent and coordinate

  • only covalent

  • covalent and ionic


4.

5 millimoles of caustic potash and 5 millimoles of oxalic acid are mixed and dissolved in 100 mL water. The solution will be

  • basic

  • acidic

  • neutral

  • cannot say


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5.

How many moles of O2 can be obtained by electrolysis of 90 g H2O?

  • 5.0 mol

  • 0.5 mol

  • 2.5 mol

  • 0.25 mol


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6.

Four different sets of quantum numbers for 4 electrons are given below:

e1 = 4, 0, 0, -12

e2 = 3, 1, 1, -12

e3 = 3, 2, 2, +12

e4 = 3, 0, 0, +12

The order of energy of e1, e2, e3, e4 is 

  • e> e> e> e4

  • e> e> e> e1

  • e> e> e> e4

  • e> e> e> e1


C.

e> e> e> e4

The order of increasing energies of the various orbitals or electrons can be calculated on the basis of (n + l) rule. According to this rule, the lower the value of (n + l) for an orbital, lower is its energy. However, if the two different types of orbitals have the same values of (n + l), the orbital with lower value of n has lower energy.

Type of electron value of n value of l value of (nl) Relative energy
e1 4 0 4 + 0 = 4 Higher energy than e2, because of high value of n = 1
e2 3 1 3 + 1 = 4 Lower energy than e1, because of two value of (n = 3)
e3 3 2 3 + 2 = 5 Highest energy
e4 3 0 3 + 0 = 3 Lowest energy

So, the order of energy, e3 > e1 > e2 > e4


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7.

Which of the following nuclei is most unstable?

  • Ca2040

  • Mn3555

  • Sn50119

  • Al1330


8.

Electron affinity is positive when

  • O- is formed from O

  • O2- is formed from O-

  • O+ is formed from O

  • electron affinite is always a negative value


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9.

When solid melts, there will be

  • a decrease in enthalphy

  • a decrease in free energy

  • a decrease in entropy

  • all the above factors remain constant


10.

Which solution is a buffer?

  • Acetic acid + NaOH (equimolar ratio)

  • Acetic acid + NaOH (1 : 2 molar ratio)

  • Acetic acid + NaOH (2 : 1 molar ratio)

  • HCl + NaOH (equimolar ratio)


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