JEE (Advanced) 2021 Paper-2
The amount of energy required to break a bond is same as the amount of energy released when the same bond is formed. In gaseous state, the energy required for homolytic cleavage of a bond is called Bond Dissociation Energy (BDE) or Bond Strength. BDE is affected by s-character of the bond and the stability of the radicals formed. Shorter bonds are typically stronger bonds. BDEs for some bonds are given below:
Correct match of the C-H bonds (shown in bold) in Column J with their BDE in Column K is
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The reaction of $$K_3[Fe(CN)_6]$$ with freshly prepared $$FeSO_4$$ solution produces a dark blue precipitate called Turnbull’s blue. Reaction of $$K_4[Fe(CN)_6]$$ with the $$FeSO_4$$ solution in complete absence of air produces a white precipitate X, which turns blue in air. Mixing the $$FeSO_4$$ solution with $$NaNO_3$$, followed by a slow addition of concentrated $$H_2SO_4$$ through the side of the test tube produces a brown ring.
For the following questions answer them individually
One mole of an ideal gas at 900 K, undergoes two reversible processes, I followed by II, as shown below. If the work done by the gas in the two processes are same, the value of $$\ln \frac{V_3}{V_2}$$ is ___.
(U: internal energy, S: entropy, p: pressure, V: volume, R: gas constant)
(Given: molar heat capacity at constant volume, $$𝐶_{𝑉,𝑚}$$ of the gas is $$\frac{5}{2}R$$)
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Consider a helium (He) atom that absorbs a photon of wavelength 330 nm. The change in the velocity (in cm s$$^{-1}$$) of He atom after the photon absorption is ___.
(Assume: Momentum is conserved when photon is absorbed.
Use: Planck constant = $$6.6 \times 10^{-34}$$ J s, Avogadro number = $$6 \times 10^{23} mol^{-1}$$, Molar mass of He = 4 g mol$$^{-1}$$)
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Ozonolysis of $$ClO_2$$ produces an oxide of chlorine. The average oxidation state of chlorine in this oxide is ___.
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