The colour sequence in a carbon resistor is red,brown,orange and silver. The resistance of the resistor is

Consider the reaction:
$Cl_{2(aq)} + H_2S_{(aq)} \to S_{(s)} + 2H^{+}_{(aq)} + 2Cl^{-}_{(aq)}$
The rate equation for this reaction is $\text{rate} = k[Cl_2][H_2S]$. Which of these mechanisms is/are consistent with this rate equation?
$A.$ $Cl_2 + H_2S \to H^{+} + Cl^{-} + Cl^{+} + HS^{-}$ (slow)
$Cl^{+} + HS^{-} \to H^{+} + Cl^{-} + S$ (fast)
$B.$ $H_2S \rightleftharpoons H^{+} + HS^{-}$ (fast equilibrium)
$Cl_2 + HS^{-} \to 2Cl^{-} + H^{+} + S$ (slow)

According to molecular orbital theory,the total number of bonding electron pairs in $O_2$ is

An integrating factor of the equation $(1+y+x^2 y) dx+(x+x^3) dy=0$ is

$Mg$ is obtained by:

Suppose there is a hole in a copper plate. On heating the plate,the diameter of the hole would: