311.

The polypeptides are obtained by assembling the peptide units by

• ionic bond

• covalent bond

• intermolecular H-bonding

• covalent and H-bonding

Which one of the following have linear structure?

(I) I${}_3^{-}$ 

(II) NO${}_2^{-}$ 

(III) I${}_3^{+}$ 

(IV) SO₂

(V) N${}_3^{-}$

• I, II and III

• I and V

• II, III and IV

• All of these

The dipole moment of HBr is 1.6 × 10^-30 cm and inter atomic spacing is 1 Å. The % ionic character of HBr is

• 7

• 10

• 25

• 27

The bond order of H${}_2^{-} \mathrm{ion} \mathrm{is} \frac{1}{2}.$ If it has 2 bonding electron, how many antibonding electrons it will have?

• 4

• 3

• 2

• 1

Ni²⁺ ion (Z= 28) contains unpaired electrons

• 1

• 2

• 3

• 5

A magnetic moment of 1.73 BM will be shown by which one among the following compounds

• [Cu(NH₃)₄]²⁺

• [Ni(CN)₄]^2-

• TiCl₄

• [CoCl₆]^4-

The bond angle is maximum in PI₃,which is

• due to small size of P

• due to more bp-bp repulsion in PI₃

• due to less electronegativity of P

• None of the above

The shape of [PtCl₃(C₂H₄)]^- and the hybridisation of Pt respectively are

• tetrahedral, sp³

• trigonal pyramidal, sp³

• square planar, dsp²

• square planar, d²sp³

Among the following compounds both coloured and paramagnetic one is

• K₂Cr₂O₇

• VOSO₄

• (NH₄)₂.[TiCl₂]

• K₃[Cu(CN)₄]

Which of the following has maximum bond energy?

• C=C

• C=O

• O=O

• N=O