Three gas phase systems are studied. The first consists of Ca 2+ and S 2- at 300

Question

Three gas phase systems are studied. The first consists of Ca2+ and S2- at 300 nm; the second is two uranium nuclei separated by 154 pm and the third is a chloride ion and iodide ion positioned 45 apart.

Which of these systems will give a negative E when separated to infinite distance? (Select all that apply.)

chloride and iodide

Ca2+ and S2-

uranium nuclei

Which of these three systems has the largest magnitude electrostatic potential, Eel? (Select all that apply)

uranium nuclei

Ca2+ and S2-

chloride and iodide

Explanation / Answer

Using the equation.

E = hc/l

where,

e = energy

h = 6.626 x 10^-34 J.s

c = 3 x 10^8 m/s

l = wavelength

Feed all the values and calculating energy

So, the systems which will give a negative deltaE when separated to infinite distance would be,

chloride and iodide

Uranium nuclei

Of the given systems the largest magnitude for the electrode potential would be for,

Ca2+ and S2-

these would be attractive type of interaction

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