Rate constant \((K)\) of a reaction has least value at

When the concentration of the reactant in a given reaction is halved and if the rate of reaction is halved, the order of the reaction is:

The \(E_{M^{3+} / M^{2+}}^o\) values for \(\mathrm{Cr}, \mathrm{Mn}, \mathrm{Fe}\) and Co are \(-0.41,+1.57,+0.77\) and +1.97 V respectively. For which of these metals, the change in oxidation state from +2 to +3 is the easiest?

Which of the following conditions are favourable for chemisorption?

Which of the following combinations can be used to synthesised ethanol?

Given below are 4 equations showing Molar conductivities at infinite dilution of various electrolytes. Which one of them represents the correct equation?
\(\begin{aligned}
& \left(\Lambda_m^0\right)_{N a B r}-\left(\Lambda_m^0\right)_{N a C l}=\left(\Lambda_m^0\right)_{\mathrm{KCl}}-\left(\Lambda_m^0\right)_{\mathrm{KBr}} \\
& \left(\Lambda_m^0\right)_{\mathrm{HCl}}+\left(\Lambda_m^0\right)_{\mathrm{KOH}}-\left(\Lambda_m^0\right)_{\mathrm{KCl}}=\left(\Lambda_m^0\right)_{\mathrm{H}_2 \mathrm{O}} \\
& \left(\Lambda_m^0\right)_{\mathrm{KBr}}-\left(\Lambda_m^0\right)_{\mathrm{NaBr}}=\left(\Lambda_m^0\right)_{\mathrm{NaBr}}-\left(\Lambda_m^0\right)_{\mathrm{Nal}} \\
& \left(\Lambda_m^0\right)_{N H_4 \mathrm{Cl}}-\left(\Lambda_m^0\right)_{\mathrm{NH}_4 \mathrm{NO}_3}=\left(\Lambda_m^0\right)_{N H_4 \mathrm{Cl}}-\left(\Lambda_m^0\right)_{N H 4 B r}
\end{aligned}\)

A current of 1.5 A is passed for 2 hours through an aqueous solution of \(\mathrm{Pd} \mathrm{X}_{\mathrm{n}}\) where X is a monovalent anion. During the electrolysis process 2.977 g of Palladium metal gets deposited at the cathode. Calculate the charge on Pd ions. (Atomic mass of Pd \(=106.4 \mathrm{~g} / \mathrm{mol}\) ).

A tentative explanation of observations without assuming that it is true is called

Which of the following series spectrum of hydrogen atom lies in ultraviolet region?

If \(x = a(\theta - \sin\theta)\) and \(y = a(1 - \cos\theta)\), then \(\dfrac{(1 + y_1^2)^{3/2}}{y_2} =\)

Match \(\mathrm{A}, \mathrm{B}, \mathrm{C}\) and D with the appropriate functions given.
\(\begin{array}{|l|l|l|l|} \hline & \text { Column I } & & \text { Functions } \\ \hline \text { A } & \text { Oxidoreductase } & \text { P } & \text { Malfunctioning leads to Addison's disease. } \\ \hline \text { B } & \text { Phosphodiester bonds } & \text { Q } & \text { Regulates responses to external stimuli. } \\ \hline \text { C } & \text { Adrenal cortex } & \text { R } & \text { Catalyses glycolysis. } \\ \hline \text { D } & \text { Epinephrine. } & \text { S } & \text { Links nucleotides together. } \\ \hline \end{array}\)

A metal wire is subjected to a constant potential difference. When the temperature of the metal wire increases, the drift velocity of the electron in it

Total number of elements in the power set of \(A\) containing 17 elements is