MCQ
In $DNA,$ the complimentary bases are
- Aadenine and guanine; thymine and cytosine
- Buracil and adenine; cytosine and guanine
- ✓adenine and thymine; guanine and cytosine
- Dadenine and thymine; guanine and uracil.
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$Cl_2(aq)+H_2SO_4(aq) \rightarrow S(s)+2H^+(aq)+2Cl^-$
The rate equation for this reaction is
rate $=k[Cl_2][H_2S]$
Which of these mechanisms is/are consistent with this rate equation ?
$A.\,\, Cl_2 + H_2S \rightarrow H^+ + Cl^- + Cl^+ + HS^-\,\, (slow)$
$Cl^+ +HS^- \rightarrow H^+ +Cl^- +S \,(fast)$
$B.\,\, H_2S \rightleftharpoons H^+ + HS^-\,$ (fast equilibrium)
$Cl_2^+ + HS^- \rightarrow 2CI^- + H^+ + S\,\, (Slow)$
$Zn^{2 + }(aq.) + 2e⇔ Zn(s)$; $→$ $ -0.762$
$Cr^{3 + }(aq) + 3e ⇔ Cr(s)$; $→$ $-0.740$
$2H^ +(aq) + 2e⇔ {H_2}(g)$; $→$ $0.00$
$Fe^{3+}(aq) + e ⇔ Fe^{2+}(aq)$; $→$ $0.770$
Which is the strongest reducing agent
$(I)$ Number of $S-S$ bonds in $H_2S_nO_6$ are $(n + 1)$
$(II)$ When $F_2$ reacts with water gives $HF, O_2$ and $O_3$
$(III)$ $LiNO_3$ and $BaCl_2$ compounds are used in fire works
$(IV)$ $Be$ and $Mg$ hydrides are ionic and polymeric