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Recent questions tagged class12

Integrate : $I= \int \limits_1^3 \sqrt {3+x^3}.dx$

asked Dec 16, 2013 by meena.p

1 answer

For the given sequential reaction $A\;\overset{k_1} \rightarrow \;B\;\overset{k_2} \rightarrow C$ the concentration of A,B & C at any time 't' is given by $[A]_t=[A]_oe^{-k_1t};[B]_t=\large\frac{k_1[A_o]}{k_2-k_1}$$[e^{-k_1t}-e^{-k_2t}];[C]_t=[A_o]-([A]_t-([A]_t+[B]_t)$.The maximum concentration of $[B]$ is

asked Dec 16, 2013 by sreemathi.v

1 answer

For a first order reaction $A\rightarrow 2B$ ,graph for $\large\frac{d[B]}{dt}$ vs $\large\frac{-d[A]}{dt}$ is

asked Dec 16, 2013 by sreemathi.v

1 answer

Integrate $I= \int \limits_0^1 e^{x^2} dx$

asked Dec 16, 2013 by meena.p

1 answer

Consider the following first order completing reactions : $X\;\overset{k_1}{\longrightarrow}\;A+B$ and $Y\;\overset{k_2}{\longrightarrow}\;C+D$ if $50\%$ of the reaction of $X$ was completed when $87.5\%$ of the reaction of $Y$ was completed , the ratio of their constants $(k_1/k_2)$ is

asked Dec 16, 2013 by sreemathi.v

1 answer

$I_1 = \int \limits _1^2 |x| dx ; I_2=\int \limits_1^2 \large\frac{1}{\sqrt {1+x^2}}$$ dx $

asked Dec 16, 2013 by meena.p

1 answer

For the reaction $A\rightarrow B$ ,the rate law expression is $-\large\frac{d[A]}{dt}$$=k[A]^{3/2}$. If the initial concentration of $A$ is $[A]_0$, which of the following is true?

asked Dec 16, 2013 by sreemathi.v

1 answer

For reaction $C+D\rightarrow A+B$,the rate expression is rate=$k[C]^{1/2}[D]^{1/2}$ starting with initial concentration of 4M of C and D each,what is time taken for concentration of A to become 0.25M.Given :$k=2.303\times 10^{-2}sec^{-1}$

asked Dec 16, 2013 by sreemathi.v

1 answer

Select the correct statement:

asked Dec 16, 2013 by sreemathi.v

1 answer

Which of the following is correct expression for an irreversible nth order reaction?

asked Dec 16, 2013 by sreemathi.v

1 answer

Given the following parallel reactions, where $\large\frac{k_1}{k_2}=\frac{1}{3}$. Initially only 4 moles of A are present. The total number of moles of C at the end of 50% reaction is:

asked Dec 16, 2013 by sreemathi.v

1 answer

Given the following parallel reactions, where $\large\frac{k_1}{k_2}=\frac{1}{3}$. Initially only 4 moles of A are present. The total number of moles of A,B & C at the end of 50% reaction is:

asked Dec 16, 2013 by sreemathi.v

1 answer

$f(x^2) =x^3 (2+x^2),$$ f(x^2)= \int \limits_0^{x^3} f(t) dt,$ find $f(8)=?$

asked Dec 16, 2013 by meena.p

1 answer

Rate of reaction can be expressed by Arrhenius equation as $k=Ae^{\large\frac{-E_a}{RT}}$.Select the correct statement

asked Dec 16, 2013 by sreemathi.v

1 answer

The rate law for a reaction $A\rightarrow B$ is rate=$K[A]^m[B]^n$.On tripling the concentration of A and halving the concentration of B,the ratio of new rate to the earlier rate of the reaction will be as

asked Dec 16, 2013 by sreemathi.v

1 answer

The rate constant for a first order reaction is $20hr^{-1}$.The half life of the reaction will be

asked Dec 16, 2013 by sreemathi.v

1 answer

In a first order reaction,the concentration of the reactant decreases from 0.02M to 0.005M in 10min.The time taken to change the concentration of reactant from 0.16M to 0.025M

asked Dec 16, 2013 by sreemathi.v

1 answer

Adsorption is accompanied by

asked Dec 14, 2013 by mosymeow_1

1 answer

In which one of the following, the dispersed phase is a liquid?

asked Dec 14, 2013 by mosymeow_1

1 answer

Dalda is prepared form oils by

asked Dec 14, 2013 by mosymeow_1

1 answer

Which of the following electrolyte will have maximum flocculation value for $Fe(OH)_3$ sol?

asked Dec 14, 2013 by mosymeow_1

1 answer

An example of autocatalysis is

asked Dec 14, 2013 by mosymeow_1

1 answer

The disperse phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged respectively. Which of the following statements is not correct?

asked Dec 14, 2013 by mosymeow_1

1 answer

Identify the gas which is readily adsorbed by activated charcoal

asked Dec 14, 2013 by mosymeow_1

1 answer

Which of the following forms cationic micelles above certain concentration?

asked Dec 14, 2013 by mosymeow_1

2 answers

The volume of gases $H_2, \;CH_4, \;CO_2$ and $NH_3$ absorbed by 1 gm of activated charcoal at 298 K are in the order:

asked Dec 14, 2013 by mosymeow_1

1 answer

Which doesn't cause coagulation of coagulation of colloidal solution?

asked Dec 14, 2013 by mosymeow_1

1 answer

The concentration of electrolyte required to coagulate a given amount of $As_2S_3$ sol. is minimum in the case of:

asked Dec 14, 2013 by mosymeow_1

1 answer

Colloid of which one fo the following can be prepared by electrical dispersion as well as reduction method?

asked Dec 14, 2013 by mosymeow_1

1 answer

Arsenic sulhpide is a negative sol. The reagent with least precipitating power is

asked Dec 14, 2013 by mosymeow_1

1 answer

Milk is a colloid in which a

asked Dec 14, 2013 by mosymeow_1

1 answer

Which one of the following is an example of homogeneous catalysis?

asked Dec 14, 2013 by mosymeow_1

1 answer

The critical micellization concentration(CMC) is

asked Dec 14, 2013 by mosymeow_1

1 answer

The coagulation of $10 cm^3$ of Gold sol is completely preventred by addition of 0.025g of starch to it. The gold number of starch is

asked Dec 14, 2013 by mosymeow_1

1 answer

The ability of ion to bring about coagulation of a given colloidal solution depends upon

asked Dec 14, 2013 by mosymeow_1

1 answer

The stability of the dispersed phase in a lyophobic colloids is due to

asked Dec 14, 2013 by mosymeow_1

1 answer

Which of the following method is not employed for the purification of colloids?

asked Dec 14, 2013 by mosymeow_1

1 answer

In the preparation of AgI sol, the excess of $AgNO_3$ is added to potassium iodide solution. The particles of the sol will acquire

asked Dec 14, 2013 by mosymeow_1

1 answer

Which of the following process best describes the purification of muddy water by addition of alum?

asked Dec 14, 2013 by mosymeow_1

1 answer

A sol has positively charged colloidal particles. Which of the following solutions is required in lowest concentration for coagulation?

asked Dec 14, 2013 by mosymeow_1

1 answer

Hydrophillic colloids are stable due to

asked Dec 14, 2013 by mosymeow_1

1 answer

Point out the incorrect statement

asked Dec 14, 2013 by mosymeow_1

1 answer

Which of the following is not applicable to chemisorption?

asked Dec 14, 2013 by mosymeow_1

1 answer

According to Freundlich adsorption isotherm, which of the following is correct?

asked Dec 14, 2013 by mosymeow_1

1 answer

Which adsorption takes place at low temperature?

asked Dec 14, 2013 by mosymeow_1

1 answer

Pd can adsorb in the space between its atoms, 900 times its volume of hydrogen. This porcess is called

asked Dec 14, 2013 by mosymeow_1

1 answer

Which of the following statements is correct about Langmuir's adsorption?

asked Dec 14, 2013 by mosymeow_1

1 answer

$\int \limits_0^{x^2} t.f(t).dt =\large\frac{2}{5}.$$x^3$ then find $f\bigg(\large\frac{4}{25}\bigg)$

asked Dec 14, 2013 by meena.p

1 answer

$\large\frac{d}{dx} \int \limits_{x^2}^{x^3} \bigg(\large\frac {1}{lnt} \bigg)$$dx$

asked Dec 14, 2013 by meena.p

1 answer

$g(t) =\int \limits_o^t \sin ^6 x .dx$ find $g(\pi+t)$

asked Dec 14, 2013 by meena.p

1 answer

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