A covalent molecule AB3 has pyramidal structure. The number of lo

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 Multiple Choice QuestionsMultiple Choice Questions

271.

Among the following, the compound that contains ionic, covalent and co-ordinate linkage is

  • NH3

  • NH4Cl

  • NaCl

  • CaO


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272.

A covalent molecule AB3 has pyramidal structure. The number of lone pair and bond pair of electrons in the molecule are respectively

  • 2 and 2

  • 0 and 4

  • 3 and 1

  • 1 and 3


D.

1 and 3

The pyramidal structure of covalent molecule AB3 is as:

No. of lone pair = 1

No. of bond pair = 3


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273.

The magnetic moment of a transition metal ion is 15 BM. Therefore, the number of unpaired electrons present in it is

  • 3

  • 4

  • 1

  • 2


274.

Which one of the following conversions involve change in both hybridisation and shape?

  • CH4 → C2H6

  • NH3 → NH4+

  • BF3 → BF4-

  • H2O → H3O+


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275.

Peroxide ion ......
(i) has five completely filled antibonding molecular orbitals
(ii) is diamagnetic
(iii) has bond order one
(iv) is isoelectronic with neon
Which one of these is correct?

  • (ii) and (iii)

  • (i), (ii) and (iv)

  • (i), (ii) and (iii)

  • (i) and (iv)


276.

When O2 is converted into O2+

  • both paramagnetic character and bond order increase

  • bond order decreases

  • paramagnetic character increases

  • paramagnetic character decreases and the bond order increases


277.

Increasing order of carbon-carbon bond length for the following is

C2H4(A)   C2H2(B)  C6H6(C)  C2H6(D)

  • C < B < A < D

  • B < C < A < D

  • D < C < A < B

  • B < A < C < D


278.

Hybridised states of carbon in graphite and diamond are respectively

  • sp3, sp3

  • sp3, sp2

  • sp2, sp2

  • sp, sp3


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279.

Which of the following is not a characteristic of a covalent compound?

  • No definite geometry

  • Insoluble in polar solvent

  • Smal difference in electronegativity between the combining atoms

  • Low melting point


280.

A ligand is a

  • Bronsted acid

  • either a Lewis acid or a Lewis base

  • Lewis base

  • Lewis acid


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