Recent questions in Chemistry

The half life period of a first order reaction is $138.6$ minute . The velocity constant of the reaction is

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A catalyst is a substance which

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The alkaline hydrolysis of an enter represented by $RCOOR+OH^{-} \to RCOO^{-} +R'OH$ is

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The half life of $N_20_5$ decomposition __________ increase of temperature .

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If the rate of a gaseous reaction is independent of pressure , the order of the reaction is

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The molecularity of a reaction is

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Which of the following has been used to explain the subject of chemical kinetics ?

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The terms - dn /dt in the rate expression refers to the

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The activation energy for a hypothetical reaction A => product is 12.49 k cal/mol if temperature is raised from 295 to 305 , the rate of reaction increases by

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The activation energy of a reaction can be lowered by

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The activation energy of a reaction is zero. The rate constant of the reaction :

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In order to react , a molecular at the time of collision , must posses a certain amount of energy known as

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According to Arrhenium equation rate constant of a chemical reaction is equal to :

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The temperature coefficient of most of the reactions lies between

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In general with every $10^{\circ}$ rise in temperature the rate of reaction becomes approximately

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The influence of temperature on the rate of reaction is determined by

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The activation energy for a chemical reaction depends upon

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According to collision theory :

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In the reaction $3A \to 2B$ , rate of reaction $+d[B]|dt$ is equal to

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In a reaction $2A_2 +B_2 \to 2A_2B_1$ the reactant A will disappear at

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The rate of reaction that does not involve gases, is not dependent on :

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The role of a chemical reaction

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The rate of which a substance reacts depends upon its

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Chemical Kinetics , a branch of physical chemistry deals with

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For which electrolyte $ac= \large\frac{\lambda v}{\lambda \infty}$ dosen't hold good ?

asked Sep 21, 2015 by meena.p

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What is the number of moles of oxygen gas evolves by electrolysis of $180\;g$ of $H_2O$?

asked Sep 21, 2015 by meena.p

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The emf of a cell containing sodium / copper electrodes is $3.05\;V$ , if the electrode potential of copper electrode is $0.34\;V$ , the electrode potential of sodium is

asked Sep 21, 2015 by meena.p

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How long (in hrs) must a current of 5 ampere be maintained to electroplate 60 g of calcium from molten $cacl_2$

asked Sep 21, 2015 by meena.p

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For strong electrolytes , the plot of molar conductance versus $\sqrt 3$ is :

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The reduction potential of hydrogen halfcell will be negative if

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The electrode reaction takes place at the anode of $CH_2 -O_2$ fuel cell is

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The tendencies of the electrodes made up of $Cu,Zn$ and $Ag$ to release electrons when dipped in their respective salt solutions decreases in the order .

asked Sep 21, 2015 by meena.p

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The reduction potential values of M, N and o are $+2.46\;V,-1.13\;V,-3.13\;V$ respectively . Which of the following orders is correct regarding their reducing property ?

asked Sep 21, 2015 by meena.p

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What are the units of equivalent conductivity of a solution ?

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The half - cell reaction for the corrosion $2H^++frac{1}{2}O_2+2e^{-}\to H_2O ; \in^0=1.23\;V \\ Fe^{2+}+2e^{-} \to Fe_{r} ; \in^0=-0.44\;V$

asked Sep 21, 2015 by meena.p

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The standard reaction potential $\in ^0$ for the half reaction are: $Zn \to Zn^{2+}+2e^{-}; \in^0 =0.76\;V; Cu \to Cu^{2+}+2e^{-} ;\in ^0 =0.34\;V$ The emf for the cell reach ,$2n(r) +cu^{2+}\to Zn^{2+}+Cu(r)$

asked Sep 21, 2015 by meena.p

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In which of the following cells will be the emf be independent of the activity of the chloride ions ?

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Which of the following reactions is possible at anode ?

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The charge required to deposit 9 g of $Al$ from $Al^{3+}$ solution is (At wt of AI=27.0)

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The quantity of electricity needed to deposit $127.08\;g$ of Copper is

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The quantity of electricity needed to deposit $127.08\;g$ of copper is :-

asked Sep 21, 2015 by meena.p

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When $9.65$ coulomb of electricity is passed through a solution of silver nitrate (At mass of Ag $=108\;g\;mol^{-1} $) the amount of silver deposited is

asked Sep 21, 2015 by meena.p

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What is the amount of chlorine evolved when 2 ampere of current is passed for $30$ minutes in an aqueous solution of $Nacl$

asked Sep 21, 2015 by meena.p

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In the electro chemical reaction : $2Fe^{3}+Zn \to 2n^{2+} +2 Fe^{2+}$

asked Sep 21, 2015 by meena.p

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As a lead storage battery is charged :-

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The standard reduction potential values of three metallic cation x,y and z are $0.52,3.03$ and $ -1.18\;v$ respectively . The order of reducing powers of the corresponding metal is :

asked Sep 21, 2015 by meena.p

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The standard reduction potential for $Cu^+ / Cu $ an $Cu^{2+} /Cu^+$ are $0.337\;V$ and $0.153\;V$ respectively . The standard electrode potential of $Cu^+/Cu$ half cell is

asked Sep 21, 2015 by meena.p

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The number of coulombs required for the deposition of $107.87\;g$ of silver is

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The amount of silver deposited on passing $2F$ of electricity through aqueous solution of $AgNo_3$ is :

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The standard electrode potentials of $zn,Ag$ and $Cu$ are $-0.76,0.80$ and $0.34$ volt respectively ; then

asked Sep 21, 2015 by meena.p

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