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JEE Main2010ChemistryThermodynamics (C)Actual

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 10^8 ~ms ⁻¹ . and . N _ A =6.02 10²³ ~mol ⁻¹ )

Options

  1. A594 ~nm
  2. B640 ~nm
  3. C700 ~nm
  4. D494 ~nm

Correct answer

D. 494 ~nm

Step-by-step solution

Energy required for 1 Cl ₂ molecule = 242 10^3 ~N _ A Joules. This energy is contained in photon of wavelength ' '. aligned & hc = E 6.626 10⁻³⁴ 3 10^8 = 242 10^3 6.022 10²³ & =4947 Å 494 ~nm aligned

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