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Q.

The energy required to break one mol of Cl-Cl bonds in Cl2 is 242 K J mol-. The largest wavelength of light capable of breaking a single Cl-Cl bond is: c=3×108ms−and NA=6.02×1023mol−

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a

700 nm

b

494 nm

c

594 nm

d

640 nm

answer is B.

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Detailed Solution

Energy required for one Cl2 molecule= 242×103NAJE=hcλ or 1=hcE= 6.626×10-34×3×108×6.02×1023242×103= 494×10-9m=494 nm.
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