﻿ Copper crystallises with face centred cubic unit cell. If the ra

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# 11.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 NA = 6.02 x 1023 mol-1)

No. of atoms in unit cell, Z = 4

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12.

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)

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13.

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.

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14.

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.

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15.

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

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16.

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.

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17.

Name of the following coordination entities and describe their structure:

(i) [Fe (CN)6]4-

(ii) [Cr (NH3)4Cl2]+

(iii) [Ni (CN) 4]2-

(Atomic numbers Fe = 26. Cr = 24, Ni = 28
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18.

Write the IUPAC name of the following.

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19.

Write the IUPAC name of the following.

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20.

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

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