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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 $(c = 3 x 10^8 ms^{–1} \;and\; NA = 6.02 \times 10^{23} mol^{–1})$


( A ) 640 nm
( B ) 494 nm
( C ) 700 nm
( D ) 594 nm

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