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

Which one of the following complexes is an outer orbital complex?

(Atomic number of Mn = 25; Fe = 26; Co = 27 and Ni = 28)

• [Fe(CN)₆]^4-

• [Mn(CN)₆]^4-

• [Co(NH₃)₆]³⁺

• [Ni(NH₃)₆]²⁺

For a gas in equilibrium with a liquid, the ratio of the concentration of the gas in the solution phase to that in the gaseous phase is constant at constant temperature, only if molecules undergo

• ionisation

• dissociation

• isolation

• reaction with solvent

In the following reaction, number of possible structure is

• 1

• 2

• 5

• 6

IUPAC name of the compound is

• 2-methyl-6-ethyloct-1, 5-dienal

• 3-ethyl-7-methyloct-2, 6-dienal

• 7-methyl-3-ethyloct-2, 6-dienal

• None of the above

16.

Iron pipes, lying in acidic soil, are often attached to the blocks of magnesium for their protection from rusting, because magnesium

• is lighter than iron

• is readily converted into positive ion

• forms a corrosion-resistant alloy with iron

• prevents air from reaching the surface of iron

The number of sodium atoms in 2 moles of sodium ferrocyanide is

• 12 × 10²³

• 26 × 10²³

• 34 × 10²³

• 48 × 10²³

Match the Column I and Column II and choose the correct code given below.

Column I	Column II
A. Peroxyacetyl nitrile	i. Waste incineration
B. Indigo	ii. Vat dye
C. IR active molecules	iii. Global warming
D. Dioxins	iv. Photchemical smog

• A - iv; B - ii; C - iii; D - i

• A - i; B - ii; C - iv; D - iii

• A - ii; B - i; C - iv; D - iii

• A - iv; B - i; C - iii; D - ii

The densities of graphite and diamond at 298 K are 2.25 and 3.31 g cm^-3 respectively. If the standard free energy difference is 1895 J mol^-1, the pressure at which graphite will be transformed into diamond is

• 9.92 × 10⁸ Pa

• 9.92 × 10⁷ Pa

• 9.92 × 10⁶ Pa

• None of these

Which of the following is the most stable compound?

• Ph₃$\stackrel{+}{\mathrm{C}}$

• Ph₂$\stackrel{+}{\mathrm{C}}$H

• Ph₂$\stackrel{+}{\mathrm{C}}$H₂

• Ph$\stackrel{+}{\mathrm{C}}$H₂