JEE Advanced 2012 · Paper 2

NiCl₂{P(C₂H₅)₂(C₆H₅)}₂ exhibits temperature dependent magnetic behaviour (paramagnetic / diamagnetic). The coordination geometries of Ni²⁺ in the paramagnetic and diamagnetic states are respectively

1. Atetrahedral and tetrahedral
2. Bsquare planar and square planar
3. Ctetrahedral and square planar
4. Dsquare planar and tetrahedral

In the cyanide extraction process of silver from argentite ore, the oxidizing and reducing agents used are

1. AO₂ and CO respectively.
2. BO₂ and Zn dust respectively.
3. CHNO₃ and Zn dust respectively.
4. DHNO₃ and CO respectively.

The reaction of white phosphorus with aqueous NaOH gives phosphine along with another phosphorus containing compound. The reaction type; the oxidation states of phosphorus in phosphine and the other product are respectively

1. Aredox reaction; −3 and −5
2. Bredox reaction; +3 and +5
3. Cdisproportionation reaction; −3 and +5
4. Ddisproportionation reaction; −3 and +3

The shape of XeO₂F₂ molecule is

1. Atrigonal bipyramidal
2. Bsquare planar
3. Ctetrahedral
4. Dsee-saw

For a dilute solution containing 2.5 g of a non-volatile non-electrolyte solute in 100 g of water, the elevation in boiling point at 1 atm pressure is 2°C. Assuming concentration of solute is much lower than the concentration of solvent, the vapour pressure (mm of Hg) of the solution is (take Kᵦ = 0.76 K kg mol⁻¹)

1. A724
2. B740
3. C736
4. D718

Using the data provided, calculate the multiple bond energy (kJ mol⁻¹) of a C≡C bond in C₂H₂. That energy is (take the bond energy of a C-H bond as 350 kJ mol⁻¹.) 2 C(s) + H₂(g) → C₂H₂(g) ΔH = 225 kJ mol⁻¹ 2 C(s) → 2 C(g) ΔH = 1410 kJ mol⁻¹ H₂(g) → 2H(g) ΔH = 330 kJ mol⁻¹

1. A1165
2. B837
3. C865
4. D815

With respect to graphite and diamond, which of the statement(s) given below is (are) correct?

1. AGraphite is harder than diamond.
2. BGraphite has higher electrical conductivity than diamond.
3. CGraphite has higher thermal conductivity than diamond.
4. DGraphite has higher C-C bond order than diamond.