Which one of the following sets of quantum numbers represents the highest energy level in an atom?

• n = 4; l = 0; m = 0; s = +$\frac{1}{2}$

• n = 3; l = 1; m = 1; s = +$\frac{1}{2}$

• n = 3; l = 2; m = -2; s = +$\frac{1}{2}$

• n = 3; l = 0; m = 0; s = +$\frac{1}{2}$

For the homogeneous reaction,

4NH₃ + 5O₂ $\rightleftharpoons$ 4NO + 6H₂O

the equilibrium constant K_c has the units

• conc.⁺¹⁰

• conc.⁺¹

• conc.^-1

• it is dimensionless

3.

The correct order of decreasing first ionisation energy is

• C > B > Be > Li

• C > Be > B > Li

• B > C > Be > Li

• Be > Li > B > C

Consider the following reaction,

C₆H₅NO₂ $\stackrel{\mathrm{Sn} / \mathrm{HCl}}{\to }$ X $\stackrel{{\mathrm{C}}_6{\mathrm{H}}_5\mathrm{COCl}}{\to }$ Y + HCl

What is Y?

• Acetanilide

• Benzinilide

• Azobenzene

• Hydrazobenzene

The most basic element is

• fluorine

• iodine

• chlorine

• bromine

Ammonia is a Lewis base and it forms complexes with many cations. Which one of the following cations does not form a complex with ammonia?

• Ag⁺

• Cu²⁺

• Cd²⁺

• Pb²⁺

Argol, a brown crust, formed during the fermentation of grape juice contains

• CO₂

• fused oil

• potassium hydrogen tartarate

• lye

The pH value of 0.001 M aqueous solution of NaCl is

• 7

• 4

• 11

• unpredictable

Which buffer solution comprising of the following has its pH value greater than 7?

• CH₃COOH + CH₃COONa

• HCOOH + HCOOK

• CH₃COONH₄

• NH₄OH + NH₄Cl

Which of the following has sp²-hybridisation?

• C₂H₆

• C₂H₄

• BeCl₂

• C₂H₂