Recent questions tagged easy

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

asked Dec 17, 2013 by meena.p

1 answer

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

asked Dec 17, 2013 by meena.p

1 answer

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

asked Dec 17, 2013 by meena.p

1 answer

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

1 answer

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

asked Dec 17, 2013 by meena.p

1 answer

$\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

1 answer

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

asked Dec 17, 2013 by meena.p

1 answer

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

asked Dec 17, 2013 by sreemathi.v

1 answer

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

asked Dec 17, 2013 by meena.p

1 answer

Choose the correct option below based on the following statement:

asked Dec 17, 2013 by sreemathi.v

1 answer

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

1 answer

The photochemical reactions are those which

asked Dec 17, 2013 by sreemathi.v

1 answer

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

1 answer

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

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

asked Dec 17, 2013 by sreemathi.v

1 answer

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

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

1 answer

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

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

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

asked Dec 16, 2013 by meena.p

1 answer

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

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

1 answer

The catalyst increases the rate of reaction because it

asked Dec 16, 2013 by sreemathi.v

1 answer

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

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

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

Select the correct statement:

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

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