Discuss the characteristic properties of the transition elements with special reference to : (i) enthalpy of atomisation, (ii) variable oxidation state, (iii) formation of complex compounds, (iv) formation of coloured ions.

Discuss the general characteristics of Group-15 elements with reference to their electronic configuration, oxidation state, atomic size, ionisation enthalpy and electronegativity.

Define the following terms: (i) Standard enthalpy of atomisation of an element (ii) Bond dissociation energy (iii) bond enthalpy.

Which of the following is (are) not a state function? (i) Enthalpy (ii) Heat capacity (iii) Heat (iv) Work done.

Both representative as well as transition elements exhibit variable oxidation states. Expalin with example, the characteristic dissimilarities between the compounds formed by these elements.

Go through the following matches with reference to the elements and their deficiency symptoms in plants: (i) Sulphur - Reduced nodulation in legumes (ii) Boron - Whiptail disease (iii) Sulphur - Blossom end rot of tomato (iv) Nitrogen - Wrinkling of cereal grains Which of these are correct

Go through the following statements (i) Vagus nerve decreases the rate of impulse formation from the SA node and its conduction (ii) As the human heart is myogenic in nature, the rate of formation and conduction of cariac impulse cannot be changed by the action of nerves (iii) The end of T-wave in ECG marks the end of systole. (iv) If the P-wave in ECG is inverted , it indicates that SA node fails to initiate impulse and the atrial muscle depolarises by the impulse originating in A.V. node. Which of these are correct ?

(i) According to Hess's law it is possible to determine the enthalpy of formation of a substance which cannot be measured directly-explain. (ii) What do you mean by heat of transition?

Which of the following statement is//are correct ? (i) Formation of rhodopsin takes place in dark adaptation (ii) Destruction of rhodopsin takes place in light adaptation (iii) Destruction of rhodopsin takes place in dark adaptation (iv) Formation of rhodopsin takes place in light adaptation

(i) What is the difference betweenn the enthalpy of formation and the enthalpy of reaction? Explain with proper explain. (ii) what do you understand by the standard state of liquid benzene at 25^(@)C ?

Given below some properties of transport mechanism. Which of these are true for the facilitated transport (i) Require ATP energy (ii) Highly selective (iii) Uphill transport (iv) Requires special membrane proteins (v) Transport saturates