Which of the following has the largest number of atoms?

• 0.5 gm atom of Cu

• 0.635 gm of Cu

• 0.25 moles of Cu atoms

• 1 gm of Cu

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

5.

The ratio of the difference in energy between the first and second Bohr orbit to that between the second and third Bohr orbit is

• $\frac{1}{2}$

• $\frac{1}{27}$

• $\frac{4}{9}$

• $\frac{27}{5}$

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-

Which of the following pairs of ions cannot be separated by H₂S in dilute HCl?

• Bi³⁺, Sn⁴⁺

• Al³⁺, Hg²⁺

• Cu²⁺, Zn²⁺

• Ni²⁺, Cu²⁺

At equilibrium, if K_P = 1, then

• $∆\mathrm{G}°$ > 1

• $∆\mathrm{G}°$ < 1

• $∆\mathrm{G}°$ = 0

• $∆\mathrm{G}°$ = 1

Which of the following is most acidic?

• H₂O

• H₂S

• H₂Se

• H₂Te

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

• tetrahedral, sp³

• trigonal pyramidal, sp³

• square planar, dsp²

• square planar, d²sp³