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Standard XII

Chemistry

Photoelectric Effect

The energy re...

Question

The energy required to break one mole $C l - C l$ bonds in $C l_{2}$ is $242 K J m o l^{- 1}$ . The longest wavelength of light capable of breaking a single $C l - C l$ bond is:

594 n m

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640 n m

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700 n m

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494 n m

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Solution

The correct option is B $494 n m$
Energy required for one $C l_{2}$ molecule $= \frac{242 \times 10^{3}}{N_{A}}$ Joules.

This energy is contained in the photon of wavelength of $λ$ .

$\frac{h c}{λ} = E = \frac{6.626 \times 10^{\to 4} \times 3 \times 10^{8}}{λ} = \frac{242 \times 10^{3}}{6.022 \times 10^{23}}$

$λ = 4947 ˚ A \approx 494 n m$
Hence, option (D) is correct.

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Similar questions

Q. The energy required to break one mole of Cl–Cl bonds in

C l_{2}

242 k J m o l^{- 1}

. The longest wavelength of light capable of breaking single Cl-Cl bond is

(c = 3 \times 10^{8} m s e c^{- 1}

N_{A} = 6.023 \times 10^{23} m o l^{- 1})

Th e energy required to break one mol of Cl-Cl bonds in Cl₂ is 242 kJmol^-1. The longest wavelength of light capable of breaking a single Cl-Cl bond is

A. 594nm

B.640nm

C. 700nm

D.494nm

Q. The energy required to break one mole of

C l - C l

bond in

{C l}_{2}

242 k J {m o l}^{- 1}

. The longest wavelength of light capable of breaking a single

C l - C l

bond is:

[

c = 3 \times 10^{4} {m s}^{- 1}

and

N_{A} = 6.02 \times 10^{23} {m o l}^{- 1}

]

Q. The energy required to brake one mole of

C l - C l

bonds in

C l_{2}

242 k j m o l^{- 1}

. The longest wavelength of light capable of breaking single

C l - C l

bond is:

(c = 3 \times 10^{8} m s^{-} 1

and

N_{A} = 6.02 \times 10^{23} m o l^{- 1})

Q. The energy required to break one mole of

C l - C l

bonds in

C l_{2}

242 {kJ mol}^{- 1}

. The longest wavelength of light capable of breaking a single

C l - C l

bond is:

(c = 3 \times 10^{8} m/s and N_{A} = 6.02 \times 10^{23} {mol}^{- 1})

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The energy required to break one mole Cl−Cl bonds in Cl2 is 242 KJ mol−1. The longest wavelength of light capable of breaking a single Cl−Cl bond is:

The correct option is B 494 nmEnergy required for one Cl2 molecule =242×103NA Joules.This energy is contained in the photon of wavelength of λ.hcλ=E=6.626×10→4×3×108λ=242×1036.022×1023λ=4947˚A≈494nm Hence, option (D) is correct.

The energy required to break one mole $C l - C l$ bonds in $C l_{2}$ is $242 K J m o l^{- 1}$ . The longest wavelength of light capable of breaking a single $C l - C l$ bond is: