The calculated magnetic moment (in Bohr magnetons of Cu2+ ion is)

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171.

The calculated magnetic moment (in Bohr magnetons of Cu2+ ion is)

  • 1.73

  • zero

  • 2.6

  • 3.4


A.

1.73

Electronic configuration of Cu2+ is-

1s2, 2s2, 2p6, 3s2, 3p6, 3d9 (because 2e- goes from 4s orbital)

Number of unpaired electrons = 1

Magnetic moment = n(n + 2)

                          = 11 + 2

                          = 3

                          = 1.732

Therefore, 1.732 is the magnetic moment of Cu2+.


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172.

Which one of the following molecules contain both ionic and covalent bonds?

  • CH2Cl2

  • K2SO4

  • BeCl2

  • SO2


173.

What is the hybridization state of the central atom in the conjugate base of NH4+ ion?

  • sp

  • sp3

  • sp2

  • dsp2


174.

If the bond length and dipole moment of a diatomic molecule are 1.25 A and 1.0 D respectively, what is the percent ionic character of the bond ?

  • 10.66

  • 12.33

  • 16.66

  • 19.33


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175.

Which of the following is not correct regarding the properties of ionic compounds?

  • Ionic compounds have high melting and boiling points

  • Their reaction velocity in aqueous medium is very high

  • Ionic compounds in their molten and aqueous solutions do not conduct electricity

  • They are highly soluble in polar solvents


176.

Match the following lists:
List - I List - II
A. Ethane 1. sp carbons
B. Ethylene 2. 6 sp2 carbons
C. Acetylene 3. 2 sp3 carbons
D. Benzene

4. 2 spcarbons

5. 1 sp and 1 sp2 carbons

  • A - 3; B - 4; C - 1; D - 2

  • A - 4; B - 5; C - 3; D - 2

  • A - 3; B - 1; C - 2; D - 5

  • A - 2; B - 3; C - 4; D - 5


177.

The number of oxygen atoms bonded to one phosphorous atom in P4O6 is

  • 4

  • 3

  • 6

  • 5


178.

Which of the following has S - S bond?

  • H2S2O6

  • H2S2O7

  • H2S2O8

  • Mustard gas


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179.

Which of the following pair of ions have same paramagnetic moment?

  • Cu2+, Ti3+

  • Mn2+, Cu2+

  • Ti4+, Cu2+

  • Ti3+, Ni2+


180.

Average C-H bond energy is 416 kJ mol-1. Which of the following is correct?

  • CH4 (g) + 416 kJ → C (g) + 4H (g)

  • CH4 (g) → C (g) + 4H (g) + 416 kJ

  • CH4 (g) + 1664 kJ → C (g) + 4H (g)

  • CH4 (g) → C (g) + 4H (g) + 1664 kJ


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