The heat of atomisation of methane and ethane are and respectively. The longest wavelength of light capable of breaking the C-C bond can be expressed in SI unit as: [2026]

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Solution

Q.
The heat of atomisation of methane and ethane are $' x' {kJ mol}^{- 1}$ and $' y' {kJ mol}^{- 1}$ respectively. The longest wavelength $(λ)$ of light capable of breaking the C-C bond can be expressed in SI unit as: [2026]

1 $\frac{N_{A} h c}{250 (4 y - 6 x)}$

2 $N_{A} h c {(y - \frac{6 x}{4})}^{- 1}$

3 $\frac{h c}{1000} {(\frac{y - 6 x}{4})}^{- 1}$

4 $\frac{N_{A} h c}{250 (y - 6 x)}$

Ans.
(1)

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