Which of the following sets of orbitals are degenerate and why?
(a) 1s, 2s and 3s in Mg - atom.
(b) 2p_x, 2p_y and 2p_z in C-atom.
(c) 3s, 3p_x and 3d - orbitals in H - atom.

3

(a)

Iron piece are attracted toward a magnet but zinc piece are not Why?

3

(a)

Indicate the type of bonds present in NH₄No₃ and state the mode of hybridisation of two N-atoms in it.

3

(a)

Density of a gas is found to be 5.46 g/dm³ at 27 C and 2 bar pressure. What will be its density at STP?
Notes: STP mean at 1 bar and 273 K, so compare the density at 27\(^{o}\) C and 2 bar with density at STP by using the relation d = pM/RT

3

(a)

Prove that the excluded volume 'b' is four times the actual volume of the gas molecules.

3

(a)

50.0 g of CaCO₃ are heated to 1073 K in a 5L vessel. What percent of the CaCO₃ would decompose at equilibrium? K_p for the reaction.
\({ CaCO }_{ 3 }(s)\rightleftharpoons CaO(s)+{ CO }_{ 2 }(g)\) is 1.15 a/m at 1073 K.

3

(a)

Describe the industrial applications of hydrogen dependent on its effect on the unsaturated organic systems in the presence of a catalyst.

3

(a)

A tetravalent element forms monoxide and dioxide withoxygen. When air is passed over heated element(1273 K), Producer gas is obtained. Monoxide of the element is powerful reducing agent and reduces ferric oxide to iron. Identify the element and write formulas of its monoxide and dioxide.
Write chemical equations for the formation of prodecur gas and reduction of ferric oxide with the monoxide.

3

(a)

An alkane has a molecule mass of 72. Give all the possible structural isomers along with their IUPAC names.

3

(a)