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The energy required to break one mole of...

The energy required to break one mole of Cl-Cl bonds in `Cl_(2)` is 242 kJ `mol^(-1)`. The longest wavelength of light capable of breaking a single Cl-Cl bond is
`(C=3xx10^(8)ms^(-1)andN=6.02xx10^(23)mol^(-1))`

A

494 nm

B

594 nm

C

640 nm

D

700 nm

Text Solution

Verified by Experts

The correct Answer is:
A
`:.` For 1 mole of `Cl_2` , energy required `= 242xx10^3` Joule
`:.` For 1 molecule of `Cl_2`
Energy required `=(242xx10^3)/(6.022xx10^(23))` Joule
`:. E=(hc)/lamda`
`(242xx10^3)/(6.02 xx10^(23))=(6.6xx10^(-34) xx3xx10^8)/lamda`
`lamda = 0.494xx10^(-6)m=494` nm.
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