Recent questions tagged class12

Integrate : $ \int \limits _0^{n \pi +v} |\cos x | dx $

asked Dec 14, 2013 by meena.p

1 answer

Integrate : $\int \limits_0^{\large\frac{\pi}{2}}$$ \log \sin ^2 x \;dx$

asked Dec 13, 2013 by meena.p

1 answer

Integrate : $\int \limits_0^{\pi} \large\frac{x}{a^2 \cos ^2x + b^2 \sin ^2 x}$$dx$

asked Dec 13, 2013 by meena.p

1 answer

Find $\int \limits_2^{-1} f(x) dx\;$, given $\;\int \limits_{-1}^4 f(x) dx =4$ and$\;\int \limits_2^4 [3-f(x) ] dx=7$

asked Dec 13, 2013 by meena.p

1 answer

A parallelogram has adjacent sides $\overrightarrow a=3\overrightarrow p-\overrightarrow q\:\;and\:\:\overrightarrow b=\overrightarrow p+3\overrightarrow q$ where $ |\overrightarrow p|=|\overrightarrow q|=2$, and the angle between $\overrightarrow p\:\:and\:\:\overrightarrow q$ is $\large\frac{\pi}{3}$. The length of its diagonals are?

asked Dec 13, 2013 by rvidyagovindarajan_1

1 answer

$f(x)= \left\{ \begin{array}{1 1} e^{\cos x}.\sin x & \quad |x| < 2 \\ 2 & \quad other \end{array}. \right. $ then find $\int \limits_{-2}^3 f(x)dx=?$

asked Dec 13, 2013 by meena.p

1 answer

Integrate: $\int \limits_{_z}^{z} \large\frac{2x(1+\sin x)}{1+\cos ^2 x}$$dx$

asked Dec 13, 2013 by meena.p

1 answer

Select correct statement :

asked Dec 13, 2013 by sreemathi.v

1 answer

$f(x)= \large\frac{e^x}{1+e^x}$ $\;I_1= \int \limits_{f(-a)}^{f(a)} x g[(x) (1-x)].dx;\;I_2= \int \limits_{f(-a)}^{f(a)} x g[(x) (1-x)].dx;$ then $\large\frac{I_1}{I_2}=?$

asked Dec 13, 2013 by meena.p

1 answer

For reaction $A\rightarrow B$,what is the time taken for which $[A_t]=1M$.Given :$K=2sec^{-1},[A_o]=10M$.

asked Dec 13, 2013 by sreemathi.v

1 answer

The rate constant for a first order reaction is 2.What will be the concentration of A for reaction .$A\rightarrow B$ if $[A_o]=1M$

asked Dec 13, 2013 by sreemathi.v

1 answer

$I_1= \int \limits_{(-2-k)}^{k+3} x f[x (1-x)].dx; \; I_2= \int \limits_{(-2-k)}^{k+3} x f[x (1-x)].dx; \; \large\frac{I_1}{I_2}=?$

asked Dec 13, 2013 by meena.p

1 answer

Integrate $I= \int \limits_{-\pi}^{\pi} \large\frac{\cos ^2 x}{1+a^x}$$dx$

asked Dec 13, 2013 by meena.p

1 answer

The initial rate for zero order reaction of the gaseous reaction $A(g)\rightarrow 4B(g)$ is $10^{-3}Msec^{-1}$. If the initial concentration of $A$ is $0.01\;M$ after $2\;sec$. Concentration of $B$ should be

asked Dec 13, 2013 by sreemathi.v

1 answer

A first order reaction is represented by which of the following graphs?

asked Dec 13, 2013 by sreemathi.v

1 answer

Integrate :$\int \limits_6^8 \large\frac{[x^2]}{[x^2-28 x +196]+[x^2]}$$ dx$

asked Dec 13, 2013 by meena.p

1 answer

Integrate : $ \int \limits_3^5 \large\frac{\sqrt {\log (x)}}{\log (\theta- x)+ \log (x)}$$dx$

asked Dec 13, 2013 by meena.p

1 answer

Given a general reaction $5x+2y\rightarrow w+3z$, the instantaneous rate of reaction is :

asked Dec 13, 2013 by sreemathi.v

1 answer

Solve : $f(x)=\int \limits_0^2 \large\frac{\sqrt {2-x}}{\sqrt {2-x}+\sqrt {x}}dx$

asked Dec 13, 2013 by meena.p

1 answer

$I_1= \int \limits _0^{\pi} x \log \sin x dx;\; I_2=\int \limits_0^{\pi} \log \sin x dx . $ find $\large\frac{I_1}{I_2}$=?

asked Dec 13, 2013 by meena.p

1 answer

Given that the rate of a reaction depends on temperature, concentration, pressure and volume, which of the following is true?

asked Dec 13, 2013 by sreemathi.v

1 answer

Select the incorrect statement :

asked Dec 13, 2013 by sreemathi.v

1 answer

If a 2nd order reaction has the rate equation $R = k[A][B]$, and the rate constant, $k= 3.67\;M^{-1}s^{-1}$, $[A]$ is $4.5\;M$ and $[B]$ is $99\;M$, what is the rate constant of its pseudo-1st-order reaction?

asked Dec 13, 2013 by sreemathi.v

1 answer

Integrate : $\int \limits_0^{\large\frac{\pi}{4}} $$\log |1+ \tan x| dx$

asked Dec 13, 2013 by meena.p

1 answer

The rate of reaction between sucrose and water catalyzed by hydrogen ion is followed by measuring the angle of rotation of polarized light passing through the solution. The angle of rotation of polarized light passing through the solution is measured with a polarimeter.

asked Dec 13, 2013 by sreemathi.v

1 answer

What is the half-life of a reaction with $[A]_o = 109\;M$, $[B]_o = 1\;M$, $k' = 45M^{-1}s^{-1}$ ?

asked Dec 13, 2013 by sreemathi.v

1 answer

Integrate : $\int \limits_0^{\infty} \large\frac{\log x}{1+x^2}$$dx$

asked Dec 13, 2013 by meena.p

1 answer

What is the order of reaction of an artificial radioactive decay

asked Dec 13, 2013 by sreemathi.v

1 answer

Integrate : $\int \limits_0^{\large\frac{\pi}{2}} \large\frac{\cos ^3 x}{\sin ^3 x + \cos ^3 x }$$ dx$

asked Dec 13, 2013 by meena.p

1 answer

Given the following reaction and its intermediate steps, calculate the relation between the rate of reaction of the resultant reaction and the rates of reaction of the intermediate steps.

asked Dec 13, 2013 by sreemathi.v

1 answer

$\int \limits_0^n \{x\} dx = \int \limits_0^n x-[x]dx=\large\frac{n}{2}$ if $n=2$ then $y=?$

asked Dec 13, 2013 by meena.p

0 answers

Gaseous phase decomposition of $N_2O$ is given below :

asked Dec 13, 2013 by sreemathi.v

1 answer

Consider the reaction: 2A + B $\rightarrow$ 2C + D. What is the overall rate law given these intermediate steps:

asked Dec 13, 2013 by sreemathi.v

1 answer

For a chemical reaction rate constant $K=5.3\times 10^{-4}mol\;L^{-1}S^{-1}$ what will be the order of the reaction?

asked Dec 13, 2013 by sreemathi.v

1 answer

Given the following Assertion and Reason, which of the following statements is true?

asked Dec 13, 2013 by sreemathi.v

1 answer

$y= \int \limits_0^n [x]dx=\large\frac{n(n-1)}{2}$ if $n=2$ then $y=?$

asked Dec 13, 2013 by meena.p

1 answer

Oxide layer formation on a metal is a $Rx_n$ which is of first order with rate constant $10^{-8}min^{-1}$ if maximum thickness can be $2mm$ then what time will be taken to form a oxide layer of thickness $1.5mm$

asked Dec 13, 2013 by sreemathi.v

1 answer

Consider the following reaction:$ A + 3 B \rightarrow 2 C + 2 D$. At some point in the reaction $[B]=0.9986\; M$ and $13.20$ minutes later $[B]=0.9746\;M$. Based on this data, what is the average rate of the reaction during this time in $M/s$?

asked Dec 13, 2013 by sreemathi.v

1 answer

Integrate : $ \int \limits_0^{\large\frac{\pi}{2}} max ^m \{ \sin x , \cos x \} dx$

asked Dec 13, 2013 by meena.p

1 answer

A reaction was found to be second order with respect [ICl] and first order with respect to $[H_2]$ the overall order of reaction.

asked Dec 13, 2013 by sreemathi.v

1 answer

For a first order $Rx_n$ of rate constant K,$\;t_{ 2/3}$ the time of a reactant to drop to $1/3$) is given by:

asked Dec 13, 2013 by sreemathi.v

1 answer

$t_{1/4}$ can be taken as the time taken for the concentration of a reactant to drop to $\large\frac{3}{4}$ of its initial value. If the rate constant for a first order reaction is K, the $t_{1/4}$ can be written as

asked Dec 13, 2013 by sreemathi.v

1 answer

In an experiment (reactant $\rightarrow$ product) we observe that if we increase the reactant to twice then time taken in the concentration of reaction to drop to $\large\frac{1}{2}$ of its value is reduced to $\large\frac{1}{4}$ then order is

asked Dec 13, 2013 by sreemathi.v

1 answer

Integrate : $ \int \limits_0^{\large\frac{\pi}{2}} min ^m \{ \tan x , \cot x \} dx$

asked Dec 13, 2013 by meena.p

1 answer

Integrate: $\int \limits _0^{3 \pi} \large\frac{|\sin x|}{\sin x}$$dx$

asked Dec 12, 2013 by meena.p

1 answer

Integrate : $ \int \limits _{-1}^5 \large\frac{|x|}{x}$$dx$

asked Dec 12, 2013 by meena.p

1 answer

Integrate: $\int \limits_{1/e}^e | \log_e x| dx $

asked Dec 12, 2013 by meena.p

1 answer

Integrate :$\int \limits_0^3 |2-x|\;dx$

asked Dec 12, 2013 by meena.p

1 answer

$\int \limits_1^4 \large\frac{2 e^{\Large \sin x^2}}{x}$$=f(k)-f(1)$ then find $k$=? if $\large\frac{d}{dx}$$f(x)=\Large\frac{e^{\sin x }}{\normalsize x}$

asked Dec 12, 2013 by meena.p

1 answer

Integrate : $\int \limits_0^{\large\frac{z}{2}}$$ \cos x \sin ^3 x dx$

asked Dec 12, 2013 by meena.p

1 answer

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