Recent questions tagged class12

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

asked Dec 17, 2013 by meena.p

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Integrate :$\int \large\frac{1}{1+\cos x}$$dx$

asked Dec 17, 2013 by meena.p

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$I_n =\int \limits_0^{z/4} \tan ^n x \;dx$ find $I_{n-1}+I_{n+1}$

asked Dec 17, 2013 by meena.p

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$\int \limits_0^a x dx < a+4$ then

asked Dec 17, 2013 by meena.p

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Consider following potential energy graph

asked Dec 17, 2013 by sreemathi.v

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Integrate : $ \int \limits_{-\frac{\pi}{2}}^{\frac{\pi}{2}} \large\frac{\log (5 - \theta \sin \theta)}{\log (5+\theta \sin \theta)}$$d \theta$

asked Dec 17, 2013 by meena.p

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The variation of PE & KE as reactant molecules approach each other can be represented by

asked Dec 17, 2013 by sreemathi.v

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If $\overrightarrow a,\:\overrightarrow b$ are two non zero and non collinear vectors, then $[\overrightarrow a\:\overrightarrow b\:\hat i]\hat i+[\overrightarrow a\:\overrightarrow b\:\hat j]\hat j+[\overrightarrow a\:\overrightarrow b\:\hat k]\hat k=?$

asked Dec 17, 2013 by rvidyagovindarajan_1

1 answer

Which of following corresponds to faster reaction at room temperature? (y-axis is Potential Energy and x-axis is Progress of reaction).

asked Dec 17, 2013 by sreemathi.v

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Integrate : $\int \limits _0^{\frac{\pi}{4}} \large\frac{\sec x cosec x}{\log (\tan x)}$$dx$

asked Dec 17, 2013 by meena.p

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$\int \limits _0^{\omega} \large\frac{x^2}{(x^2+a^2) (x^2+b^2) (x^2+c^2)}$$dx= \large\frac{\pi}{2(a+b)(b+c)(c+a)}$ then find $\int \limits _0^{\omega} \large\frac{dx}{(x^2+4)(x^2+g)}$

asked Dec 17, 2013 by meena.p

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$\int \limits_1^6 (6-4x) dx \leq 6-5b \;\&\;6 > 1$ Find 'b' value

asked Dec 17, 2013 by meena.p

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Integrate : $\int \limits_0^{\frac{\pi}{2}} \large\frac{\phi(x)}{\phi (\Large\frac{\pi}{2}-x)+\phi (x)}$$dx$

asked Dec 17, 2013 by meena.p

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An activated complex has

asked Dec 17, 2013 by sreemathi.v

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An increase in temperature increases the rate of a chemical reaction because

asked Dec 17, 2013 by sreemathi.v

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$\int \limits_{-\pi}^{\pi} (\cos px - \sin q x)^2 dx$ where $p \;\&\; q$ are whole number. Find its value.

asked Dec 17, 2013 by meena.p

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If for same temperature we consider the following two reactions, then Collision I is successful and II is not because of what?

asked Dec 17, 2013 by sreemathi.v

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Integrate: $\int \limits_0^{\rho} \large\frac{y.dy}{\sqrt {y+\rho}}$

asked Dec 17, 2013 by meena.p

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Integrate: $\int \limits_0^{\rho} \large\frac{y.dy}{\sqrt {y+\rho}}$

asked Dec 17, 2013 by meena.p

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Choose the correct option below based on the following statement:

asked Dec 17, 2013 by sreemathi.v

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Which of following are necessary for successful collisions to occur? </br> (i) Favourable collision geometry </br> (ii) sufficient kinetic energy </br> (iii) Large $\Delta H$ </br>

asked Dec 17, 2013 by sreemathi.v

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The photochemical reactions are those which

asked Dec 17, 2013 by sreemathi.v

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Consider the following reaction :$NaOH(aq)+HCl(aq)\rightarrow H_2O(l)+NaCl(aq)$.The rate of reaction can be found by observing change in concentration

asked Dec 17, 2013 by sreemathi.v

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Consider the statement: Solid Mg added to 2M HCl. In the first 10 seconds,the temperature of container increased by $1^0C$ and 20ml of $H_2$ was produced. Determine rate of reaction.

asked Dec 17, 2013 by sreemathi.v

1 answer

In the following reaction and graph:$2H_2O_2(l)\rightarrow 2H_2O_2+O_2(g)$, he average rate of reaction is greatest in which time period?

asked Dec 17, 2013 by sreemathi.v

1 answer

Consider the following reaction; $2H_2O_2(l)\rightarrow 2H_2O(l)+O_2(g)$ which graph shows the relation between rate of consumption of $H_2O_2$ and time?

asked Dec 17, 2013 by sreemathi.v

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The rate of chemical equation is equal to slope of graph with ones labelled

asked Dec 17, 2013 by sreemathi.v

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Ammonia can be oxidized by oxygen to produce $NO_2$ according to reaction $4NH_3+7O_2\rightarrow 4NO_2+6H_2O$.If water is formed of $36\;mol\;L^{-1}min^{-1}$.Then respective rates of $NH_3,O_2$ used will be(in M/min)

asked Dec 17, 2013 by sreemathi.v

1 answer

For the reaction $A\;\;\;\underrightarrow{k_1}\;\;\;B\;\;\;\underrightarrow{k_2}\;\;\;C$, select the correct statement:

asked Dec 17, 2013 by sreemathi.v

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A first order reaction is 50% completed in 45 minute at $87^oC$ and in 9minutes at $127^oC$.The energy of activation of the reaction is

asked Dec 17, 2013 by sreemathi.v

1 answer

Integrate: $ \int\limits _0^{\pi} e^x \sin x dx$

asked Dec 17, 2013 by meena.p

1 answer

If $g(x) =\large\frac{f(x) +f(-x)}{2}$ defined over $[-3,3]$ and $f(x)=2x^2-4x+1$ then $\int \limits_{-3}^3=?$

asked Dec 17, 2013 by meena.p

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

asked Dec 16, 2013 by meena.p

1 answer

Integrate: $\int \limits_{0}^{\large\frac{\pi}{2}} \large\frac{\cos x}{(1+\sin x)(2+ \sin x)}$$ dx $

asked Dec 16, 2013 by meena.p

1 answer

if $h(a)=h(b) $ then $ \int \limits_a^b [f(g(h(x)))]^{-1} . f ' (g (h(x)))g ' (h(x)).h'(x) dx=?$

asked Dec 16, 2013 by meena.p

1 answer

Suppose f is such , that $f(-x) =-(x) $ for every real x and $\int\limits_0^1 f(x)x=5$ then $\int \limits _{-1}^0 =?$

asked Dec 16, 2013 by meena.p

1 answer

Integrate: $\int \limits_0^{\large\frac{2}{3}}$$ \large\frac{dx}{4+ 9x^2}$

asked Dec 16, 2013 by meena.p

1 answer

Integrate: $Un =\int \limits_0^{\large\frac{\pi}{4}} \tan ^n x dx$, find $U_n+U_{n-2}$

asked Dec 16, 2013 by meena.p

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Integrate: $\int \limits_{-2}^{2} axb +bx^3+(cx+d)$, at which coefficient its value depend

asked Dec 16, 2013 by meena.p

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The decomposition of $N_2O_5$ is a first order reaction represented by $N_2O_5\rightarrow N_2O_4+\large\frac{1}{2}$$O_2$.After 15minutes the volume of $O_2$ produced is 9ml & at the end of the reaction 35ml.The rate constant is equal to

asked Dec 16, 2013 by sreemathi.v

1 answer

What is the unit of k of a $n^{th}$ order reaction?

asked Dec 16, 2013 by sreemathi.v

1 answer

What is the rate of the reaction $A+B\rightarrow C$ based on the following experiments:

asked Dec 16, 2013 by sreemathi.v

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Integrate: $\int \limits_0^{2 \pi} \sqrt {1-\sin \large\frac{x}{2} } dx$

asked Dec 16, 2013 by meena.p

1 answer

If a reaction is catalyzed by $x$, then $x$

asked Dec 16, 2013 by sreemathi.v

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Integrate: $\int \limits_{-1}^1 x |x| dx.$

asked Dec 16, 2013 by meena.p

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The catalyst increases the rate of reaction because it

asked Dec 16, 2013 by sreemathi.v

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For the parallel reactions depicted below, which of the following options are correct?

asked Dec 16, 2013 by sreemathi.v

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For the given sequential reaction $A\;\underrightarrow{k_1}\;B\;\underrightarrow {k_2}C$ 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 time at which a concentration of B is maximum is

asked Dec 16, 2013 by sreemathi.v

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$\int \limits_0^1 |\sin 2zx| dx$

asked Dec 16, 2013 by meena.p

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$\int \limits_0^1 e^{x^2}. (x- \alpha) dx $. then , $\alpha =? $

asked Dec 16, 2013 by meena.p

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