Calcutta university (BSc II) Chemistry

Chemistry Gen:

PART - II

CGT 21b

Unit II. Basic inorganic chemistry III

 1.      Explain Why:

                   I.            Size of Na⁺ ion is less than that of K⁺ ion.

                II.            Size of C^4- ion is greater than that of N^3- ion.

             III.            Halogens have the highest electron affinity in their periods.

 2.      Explain the factors which affect

                   I.            Ionisation energy of elements.

                II.            Electron affinity of elements.

 3.      Give the general trend in the following properties of alkali metals.

                   I.            Electropositive character.

                II.            Ionisation energy.

             III.            Reactivity towards oxygen and water.

 4.       

                   I.            Give the postulates of electron gas model for metallic bonding.

                II.            What factors help in forming metallic bond?

 5.      Give reasons as to why alkali metals

                   I.            Are soft, volatile and highly electropositive.

                II.            Lose electrons even when exposed to light.

 6.      To what do we attribute the diagonal relationship that exists between Be and Mg? List three ways in which lithium and magnesium are similar to one another.

 7.      How do the following properties vary down a group in alkaline earth metals?

                   I.            Metallic character

                II.            Ionic compound formation

             III.            Crystal structure

             IV.            Enthalpy of hydration.

 8.      Explain

                   I.            How does Li differ from its congeners?

                II.            Discuss the trend in properties of the hydrides of alkali metals.

 9.      Explain the following:

                   I.            Metals show luster.

                II.            Metals are malleable and ductile.

             III.            Conductivity of metals decreases with rise in temperature.

             IV.            Alloys show poor electrical conductivity than pure metal

 10.  What is the principle of solvent extraction technique?

 11.  State and explain the term selectivity?

 12.  Write short note on electroplating.

 13.  Define the term adsorption. Explain different theories of adsorption.