Aluminium chloride exists as dimer, Al₂Cl₆, in solid state as well as in solution of non-polar solvents such as benzene. When dissolved in water, it gives

• Al³⁺ + 3Cl^-

• [Al(H₂O₆]³⁺ + Cl^-

• [Al(HO)₆]^3- + 3HCl

• Al₂O₃ + 6HCl

Where of the ${\mathrm{O}}_2^{-}, {\mathrm{O}}_2^{2-},$ BN and NN is/are paramagnetic ?

• NN

• ${\mathrm{O}}_2^{2-}$

• BN

• ${\mathrm{O}}_2^{-}$

Which of the following is not true?

• In a first order reaction, the half-life is independent to the initial concentration of reactant.

• A given piece of charcoal shows increase in its surface area in its powdered form.

• In valence bond of H₂, each electron spends its time around its own nucleus

• In valence bond of H₂, both the electrons spend their time around both the nucleus

The correct order of decreasing dipole moment of (I) toluene, (II) m-dichlorobenzene (III) o-dichlorobenzene and (IV) p-dichlorobenzene is

• IV < II < I < III

• IV < I < II < III

• I < IV < II < III

• IV < I < III < II

345.

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-