Copper crystallises with face centred cubic unit cell. If the radius of a copper atom is 127.8 pm, calculate the density of the copper metal.

(Atomic mass of Cu = 63.55 u and Avogadro’s number N_A = 6.02 x 10²³ mol^-1)

Iron has a body centred cubic unit cell with the cell dimension of 286.65 pm. The density of iron is 7.87 g cm^-3. Use this information to calculate Avogadro’s number. (Atomic mass of Fe = 56.0 u)

The reaction N₂(g) + O₂(g)   2NO(g), contributes to air pollution whenever a fuel is burnt in air at a high temperature. At 1500 K, equilibrium constant K for it is 1.0 x 10^-5. Suppose in a case [N₂] = 0.80 mol L^-1and [O₂] = 0.20 mol L^-1 before any reaction occurs. Calculate the equilibrium concentrations of the reactants and the product after the mixture has been heated to 1500 K.

The electrical resistance of a column of 0.05 M NaOH solution of diameter 1cm and length 50

cm is 5.55 x 10³ ohm. Calculate its resistivity, conductivity and molar conductivity.

Write three distinct features of chemisorptions which are not found in physisorptions.

Explain each of the following observations:

(i) With the same d-orbital configuration (d⁴), Cr²⁺ is a reducing agent while Mn³⁺ is an oxidising agent.

(ii) Actinoids exhibit a much larger number of oxidation states than the lanthanoids.

(iii) There is hardly any increase in atomic size with increasing atomic number in a series of transition metals.

Name of the following coordination entities and describe their structure:

(i) [Fe (CN)₆]^4-

(ii) [Cr (NH₃)₄Cl₂]⁺

(iii) [Ni (CN) ₄]^2-

18.

Write the IUPAC name of the following.

Write the IUPAC name of the following.

Write a reaction which shows that all the carbon atoms in glucose are linked in a straight chain.