11.

Mixing of two different ideal gases under isothermal reversible condition will lead to

• increase of Gibbs free energy of the system

• no change of entropy of the system

• increase of entropy of the system

• increase of enthalpy of the system

The ground state electronic configuration of CO molecule is

• 1σ²2σ²1$\mathrm{\pi }$⁴3σ²

• 1σ²2σ²3σ²1$\mathrm{\pi }$²2$\mathrm{\pi }$²

• 1σ²2σ²1$\mathrm{\pi }$²3σ²2$\mathrm{\pi }$²

• 1σ²1$\mathrm{\pi }$²2σ²2σ²

Pressure-volume (pV) work done by an ideal gaseous system at constant volume is (where E is internal energy of the system)

• -$∆$p/p

• zero

• -V$∆$p

• -$∆$E

For isothermal expansion of an ideal gas, the correct combination of the thermodynamic parameters will be

• $∆$U = 0; Q = 0; W ≠ 0 and $∆$H ≠  0

• $∆$U ≠ 0; Q ≠ 0; W ≠ 0 and $∆$H =  0

• $∆$U = 0; Q ≠ 0; W = 0 and $∆$H ≠  0

• $∆$U = 0; Q ≠ 0; W ≠ 0 and $∆$H =  0

Addition of excess potassium iodide solution to a solution of mercuric chloride gives the halide complex

• tetrahedral K₂[HgI₄]

• trigonal K [HgI₃]

• linear Hg₂I₂

• square planar K₂[HgCl₂I₂]

In borax the number of B-O-B links and B-OH bonds present are, respectively

• five and four

• four and five

• three and four

• five and five

The standard Gibbs free energy change ($∆$G°) at 25°C for the dissociation of N₂O₄(g) to NO₂(g) is (given, equilibrium constant = 0.15, R = 8.314 JK/mol)

• 1.1 kJ

• 4.7 kJ

• 8.1 kJ

• 38.2 kJ

Identify the correct statement.

• Quantum numbers (n, l, m, s) are arbitrarily

• All the quantum numbers (n, l, m, s) for any pair of electron in an atom can be identical under special circumstance

• All the quantum numbers (n, l, m, s) may not be required to describe an electron of an atom completely

• All the quantum numbers (n, l, m, s) are required to describe an electron of an atom completely

In basic medium the amount of Ni²⁺ in a solution can be estimated with the dimethylglyoxime reagent. The correct statement(s) about the reaction and the product is (are) 

• in a ammoniacal solution Ni²⁺ salts give cherry-red precipitate of nickel (II) dimethylglyoximate

• two dimethylglyoximate units are bound to one Ni²⁺

• in the complex two dimethylglyoximate units are hydrogen bonded to each other

• each dimethylglyoximate unit forms a six membered chelate ring with Ni²⁺

Tautomerism is exhibited by

• (Me₃CCO)₃CH

• 

• 

•