Which of the following expressions correctly represents the equivalent conductance at infinite dilution of Al2(SO₄)₃ ? Given that ${\mathrm{\Lambda }}_{{\mathrm{Al}}^{3+}}^{°}$ and ${\mathrm{\Lambda }}_{{\mathrm{SO}}_4^{2-}}^{°}$ are the equivalent conductances at infinite dilution of the respective ions?

• $2{\mathrm{\Lambda }}_{{\mathrm{Al}}^{3+}}^{°} + 3{\mathrm{\Lambda }}_{{\mathrm{SO}}_4^{2-}}^{°}$

• ${\mathrm{\Lambda }}_{{\mathrm{Al}}^{3+}}^{°} + {\mathrm{\Lambda }}_{{\mathrm{SO}}_4^{2-}}^{°}$

• $({\mathrm{\Lambda }}_{{\mathrm{Al}}^{3+}}^{°}+ 3{\mathrm{\Lambda }}_{{\mathrm{SO}}_4^{2-}}^{°} )\times 6$

• $\frac{1}{3}{\mathrm{\Lambda }}_{{\mathrm{Al}}^{3+}}^{°}+ \frac{1}{2}{\mathrm{\Lambda }}_{{\mathrm{SO}}_4^{2-}}^{°}$

Match List I (Substances) with List II (Processes employed in the manufacture of the substances) and select the correct option.

• A	B	C	D
  1	4	2	3

• A	B	C	D
  1	2	3	4

• A	B	C	D
  4	3	2	1

• A	B	C	D
  4	2	3	1

Which one of the following complexes is not expected to exhibit isomerism?

• [Ni(NH₃)₄ (H₂O)₂]²⁺

• [Pt(NH₃)₂Cl₂]

• [Ni(NH₃)₂Cl₂]

• [Ni(em)₃]²⁺

Which of the following oxidation states is the most common among the lanthanoids?

• 4

• 2

• 3

• 5

25.

A 0.1 molal aqueous solution of a weak acid is 30% ionised. If K_f for water is 1.86° C/m, the freezing point of the solution will be

• -0.18$°$C

• -0.54$°$C

• -0.36$°$C

• -0.24$°$C

Which of the following carbonyls will have the strongest C-O bond?

• $\mathrm{Mn}(\mathrm{CO}{)}_6^{+}$

• $\mathrm{Cr}(\mathrm{CO}{)}_6$

• $\mathrm{V}(\mathrm{CO}{)}_6^{-}$

• $\mathrm{Fe}(\mathrm{CO}{)}_5$

A solid compound XY has NaCl structure. If the radius of the cation is 100 pm, the radius of the anion (Y^- ) will be

• 275.1 pm

• 322.5 pm

• 241.5 pm

• 165.7 pm

The unit of rate constant for a zero order reaction is

• mol L^-1 s^-1

• L mol^-1 s^-1

• L² mol^-2s^-1

• s^-1

Which of the following complex compounds will exhibit highest paramagnetic behaviour? (At. no. Ti= 22, Cr= 24, Co= 27, Zn= 30)

• [Ti(NH₃)₆]³⁺

• [Cr((NH₃)₆]³⁺

• [Co(NH₃)₆]³⁺

• [ZN(NH₃)₆]²⁺

The following reactions take place in the blast furnace in the preparation of impure iron. Identify the reaction pertaining to the formation of the slag.

• ${\mathrm{Fe}}_2{\mathrm{O}}_3 \left(\mathrm{s}\right) + 3\mathrm{CO}\left(\mathrm{g}\right) \to 2\mathrm{Fe}\left(\mathrm{l}\right)\hspace{0.17em}+ 3{\mathrm{CO}}_2\left(\mathrm{g}\right)$

• ${\mathrm{CaCO}}_3\left(\mathrm{s}\right) \to \mathrm{CaO}\left(\mathrm{s}\right)\hspace{0.17em}+ {\mathrm{CO}}_2\left(\mathrm{g}\right)$

• $\mathrm{CaO}\left(\mathrm{s}\right) + {\mathrm{SiO}}_2\left(\mathrm{s}\right) \to {\mathrm{CaSiO}}_3\left(\mathrm{s}\right)$

• $2\mathrm{C}\left(\mathrm{s}\right) + {\mathrm{O}}_2\left(\mathrm{g}\right) \to 2\mathrm{CO}\left(\mathrm{g}\right)$