Give ans

1. The molecular orbital with highest energy in a nitrogen molecule is

(a) σ^*_2S         (b) π_2P        (c) σ^*_2P         (d) π^*_2P

2. A colourless salt when heated imparts lilac colour to the flame. It turns red litmus blue. The salt is

(a) Na₂CO₃       (b) KNO₃       (c) NaNO₃         (d) K₂CO₃

3. The metal that CANNOT be displaced from its aqueous solution by zinc is

(a) Cu         (b) Ag         (c) Al           (d) Hg

4. The product obtained in the nitration of 4-methyl-N,N-dimethylaniline in a strongly acidic medium is

(a) 4-methyl-2-nitro-N,N-dimethylaniline

(b) 4,N-dinethyl-2,5-dinitroaniline

(c) 4-methyl-2,5-dinitroaniline

(d) 4-methyl-3-nitro-N,N-dimethylaniline

5. Boron nitride is isolelectronic with

(a) LiF       (b) CO         (c) (CN)^-        (d) AlN

6. The equation for real gases is (P + a(n/V)² )(V – nb) = nRT. In the above equation, the terms a(n/V)² and (-nb) respectively represent the corrections for

(a) intermolecular attractive forces and inelastic collision

(b) intermolecular repulsive forces and high temperatures

(c) intermolecular attractive forces and molecular volumes

(d) deviations in the temperature and pressure

7. The substance that has the lowest boiling point is

(a) HCl        (b) H₂S       (c) PH_3­       (d) SiH₄

8. IUPAC name for K₃[(C₂O₄)₃] is

(a) potassium trioxalato aluminate ()

(b) potassium aluminium oxalate

(c) potassium trioxalate aluminium ()

(d) potassium trisoxalato aluminium ()

9. The phenomenon which first suggested that light is emitted in packets (quanta) is

(a) electron diffraction            (b) photoelectric effect

(c) diffraction of light             (d) black body radiation

10. The total number of electrons present in 8.0 g of methane is

(a) 4.8 x 10²⁴       (b) 3.01 x 10²⁴        (c) 4.8 x 10²⁵          (d) 3.01 x 10²³