Write the complete symbol for the atom with the given number (Z) and atomic mass (A).
(a) Z = 92, A = 233
(b)  Z = 4, A = 9

3

(a)

With what 7'elocity must an electron travel so that its momentum is equal to that of a photon of wavelength = 5200 \(\mathring { A } \) ?

3

(a)

What do you understand by isoelectronic species? Name a species that will be isoelectronic with the following atom or ion. Ar

3

(a)

X, Y and Z elements have 4, 5 and 7 valence electrons. Draw the structure of XH₄ , YH₅, YH₃ and H-Z.

3

(a)

Pressure versus volume graph for a real gas and an ideal gas are shown in figure. Answer the following questions on the basis of the graph.

Interpret the behaviour of real gas with respect to ideal gas at high pressure.

3

(a)

What is bond energy? Why is it called enthalpy of atomisation?

3

(a)

Consider the cell Zn | Zn²⁺ (aq) ||Cu²⁺ (aq) |Cu
The standard electrode potentials are E^oZn^2+/Zn = 0.76 V; E^oCu²⁺/Cu = 0.34 V Write down the cell reaction.

3

(a)

What are interstitial hydrides? Give two examples.

3

(a)

Why does the solution of alkali metals becomes blue in liquid ammonia? Give the chemical equation also.

3

(a)

Write all structural isomers of molecular formula C₃H₆O.

3

(a)

What is polymerization? Give an example.

3

(a)

What is 'Acid Rain'? How is it harmful to the environment?

3

(a)