MCQ
The heaviest atom amongst the following is
- ✓$U$
- B$Ra$
- C$Pb$
- D$Hg$
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$(i)$ $n\, = 4, l\, = 1$ $(ii)$ $n\, = 4, l\, = 0$
$(iii)$ $n\, = 3, l\, = 2$ $(iv)$ $n\, = 3, l\, = 1$
The sequence representing increasing order of energy, is

$Cl_2(aq) + H_2S(aq) \to S(s) + 2H^+(aq) + 2Cl^-(aq)$ rate law is $r = K[Cl_2][H_2S]$
then which of these mechanism is/are consistent with this rate law
$(A)\, H_2S \rightleftharpoons H^+ + HS^-$ (fast)
$Cl_2 + HS^-\to 2Cl^-+ H^+ + S$ (slow)
$(B)\, Cl_2 + H_2S \to H^+ + Cl^-+ Cl^+ + HS^-$ (slow)
$Cl^+ + HS^-\to H^+ + Cl^-+ S$ (fast)
$(R= 8.314\,\,JK^{-1}\,\,mol^{-1};\,\,ln\,2 = 0.693;\,\,ln\,3 = 1.098)$