In which of the following pairs, the two species are isostructural ?

[2007]

(a) SF4 and XeF4

(b) SO32- and NO3-

(c) BF3 NF3

(d) BrO3- and XeO3

Concept Questions :-

Hybridisation
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In which one of the following molecules, the central atom said to adopt sp2 hybridisation ?

(a) BeF2

(b) BF3

(c) C2H2

(d) NH3

Concept Questions :-

Hybridisation
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The correct order of C-O bond length among CO, CO32-, CO2 is

(a) CO2 < CO32- < CO

(b)CO = CO2 < CO32-

(c) CO32- < CO2 < CO

(d)CO < CO2 < CO32-

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According to molecular orbital theory which of the following lists rank the nitrogen species in terms of increasing bond order ?

(a) N2- < N2 < N22-

(b) N22- < N2- < N2

(c) N2 < N22- <N2-

(d) N2- < N22- < N2

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In which of the following molecules/ions BF3, NO2-,NH2- and H20, the central atom is sp2 hybridised? 

(a) NO2and NH2-

(b) NH2-  and H20

(c) NO2- and H20

(d) BFand NO2-

Concept Questions :-

Hybridisation
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Which one of the following is planar ?

(a) XeF4

(b) XeO4

(c) XeO3

(d) XeO3F2

Concept Questions :-

Hybridisation
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In PO43- ion, the formal charge on each oxygen atom and P-O bond order respectively are

(a) -0.75, 0.6

(b) -0.75, 1.0

(c) -0.75, 1.25

(d) -3.1, 1.25

Concept Questions :-

Formal Charge and Coordinate Bond
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The dielectric constant of H2O is 80. The electrostatic force of attraction between Na+ and Cl- will be

(a) reduced to 140 in water than in air

(b) reduced to 180 in water than in air

(c) will be increased to 80 in water than in air

(d) will remain unchanged

Concept Questions :-

Ionic Bonding
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Which of the following is isoelectronic ? 

(a) CO2, NO2

(b) NO2-, CO2

(c) CN-, CO

(d) SO2, CO2

Concept Questions :-

Types of Bonding
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In an octahedral structure, the pair of d orbitals involved in d2sp3-hybridisation is

(a) dx2-y2, dz2

(b) dxy, dx2-y2

(c) dz2, dxz

(d) dxy, dyz

Concept Questions :-

Covalent Bonding
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