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Recent questions tagged class12

For following data for hydrolysis of benzene diazonium chloride $C_6H_5-N=N-Cl+H_2O\rightarrow C_6H_5OH+HCl+N_2(g)$, What is the first order calculate rate constant?

asked Dec 19, 2013 by sreemathi.v

1 answer

Integrate : $ \int \large\frac{8}{9} \frac{x}{\sqrt {1-x^4}}$$dx$

asked Dec 19, 2013 by meena.p

1 answer

Integrate : $\int \large\frac {e^{2x}+e^{-2x}}{e^{2x}-e^{-2x}}$$dx$

asked Dec 19, 2013 by meena.p

1 answer

The gas -phase thermal decomposition of one mole of $(CH_3)_3CO_2C(CH_3)_3$ in a constant volume apparatus yields two moles of acetone and one mole of ethane.If the reaction obeys ${1^{st}}$ order then which of the following is true?

asked Dec 19, 2013 by sreemathi.v

1 answer

Integrate : $ \int e^x (a e^x+b)^n. dx$

asked Dec 19, 2013 by meena.p

1 answer

Integrate : $ \int \sqrt{\sin ^3 x}. \cos x \;dx$

asked Dec 19, 2013 by meena.p

1 answer

Integrate : $ \int x \sec ^2x^2 .dx$

asked Dec 19, 2013 by meena.p

1 answer

From following data of decomposition of ammonium nitrate in aqueous solution, Determine the order of reaction:

asked Dec 19, 2013 by sreemathi.v

1 answer

For reversible reaction,$X\;\;\overset{\overset{k_1}{\rightleftharpoons}}{k_2}\;\;Y$.$k_1=2hr^{-1}$ and $\large\frac{[X_{eq}]}{[Y_{eq}]}$$=6$.If $[X_0]=2M,[Y_0]=0M$.What will be the the concentration of Y after 1hr?

asked Dec 19, 2013 by sreemathi.v

1 answer

Integrate: $\int \large\frac{\Large e^{\tan ^{-1}(m)}}{1+m^2}$$.dm$

asked Dec 19, 2013 by meena.p

1 answer

Integrate : $\int \large\frac{(1-2x^2)^2}{x^{3/2}}$$dx$

asked Dec 19, 2013 by meena.p

1 answer

$f'(x) = a \cos x + b \sin x ;\; f'(0)=4;\; f(0)=3;\; f \bigg(\large\frac{\pi}{2}\bigg)$$=5$. Find the value of $\;f(x)\;$?

asked Dec 19, 2013 by meena.p

1 answer

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

asked Dec 18, 2013 by meena.p

1 answer

Integrate : $\int \large\frac{x^5+1}{x^2+1}$$dx$

asked Dec 18, 2013 by meena.p

1 answer

Integrate : $\int\large\frac{\cos 2x}{\cos ^ 2 x} $$dx$

asked Dec 18, 2013 by meena.p

1 answer

Integrate : $\int \large\frac{2^x+3^x}{6^x}$$dx$

asked Dec 18, 2013 by meena.p

1 answer

The line $\overrightarrow r=\hat i+2\hat j-\hat k+\lambda(2\hat i-\hat k)$ is $\perp$ to which axis?

asked Dec 18, 2013 by rvidyagovindarajan_1

1 answer

Integrate : $ \int \sin ^2 x \cos ^2 x \;dx$

asked Dec 18, 2013 by meena.p

1 answer

The angle between the line $\overrightarrow r=(2\hat i-\hat j+3\hat k)+\lambda(3\hat i-\hat j+2\hat k)\:\:and\:\:the\:\:plane\:\:\overrightarrow r.(\hat i+\hat j+\hat k)=3$ is ?

asked Dec 18, 2013 by rvidyagovindarajan_1

1 answer

Integrate : $\int \sin ^2 x. \cos ^2 x \;dx$

asked Dec 18, 2013 by meena.p

1 answer

integrate : $\int \large\frac{1}{\sin ^2 x \cos ^2 x } $$dx$

asked Dec 18, 2013 by meena.p

1 answer

Integrate : $\int (1+2x) (3+4x) .dx$

asked Dec 18, 2013 by meena.p

1 answer

Integrate : $ \int \large\frac{ e^{5x}+e^{-7x}}{e^{2x}}$$dx$

asked Dec 18, 2013 by meena.p

1 answer

Integrate : $\sqrt { \bigg( \large\frac{1+ \sin 2x}{1+ \cos 2x}\bigg)}$$dx$

asked Dec 18, 2013 by meena.p

1 answer

Integrate : $\int \bigg( x^2 +\large\frac{1}{x^2}\bigg)^3$$ dx$

asked Dec 18, 2013 by meena.p

1 answer

An optically active compound A upon acid catalyzed hydrolysis yield two optically active compound B & C by first order kinetics.It is given that $[\alpha_0]$ for $A,B$ & C are $60^o,40^o$ & $-80^o$ respectively.If observed both of the mixture after 20 minute was $5^o$ while after completion of the reaction it was $-20^o$.What is $t_{1/2}$ of reaction?

asked Dec 18, 2013 by sreemathi.v

1 answer

A solution of A is mixed with equal volume of a solution of B containing the same number of moles,for reaction $A+B\rightarrow C$.At the end of 1 hour,A is 75% reacted.How much of A will be left unreacted at the end of 2hours if the reaction is first order in A & zero order in B.

asked Dec 18, 2013 by sreemathi.v

1 answer

Use the data to determine rate law for reaction: $2NO+H_2\rightarrow N_2O+H_2O$

asked Dec 18, 2013 by sreemathi.v

1 answer

It take 40min for concentration of reactant in first order to drop from 0.4M to 0.3M at $25^oC$.How long it will take for reaction to be 90% complete?

asked Dec 18, 2013 by sreemathi.v

1 answer

For chemical reaction shown below.Which of following statements can be rightly assumed?

asked Dec 18, 2013 by sreemathi.v

1 answer

Consider proposed mechanism for reaction between nitrogen monoxide and hydrogen gas.Step (i):$2NO\rightarrow N_2O_2$,Step 2:$N_2O_2+H_2\rightarrow N_2O+H_2O$,Step 3:$N_2O+H_2\rightarrow N_2+H_2O$.If step 2 rate determining step,then rate law for reaction and all the intermediate of reaction will be

asked Dec 18, 2013 by sreemathi.v

1 answer

The half life of carbon is 5730years.Approximately how many years will it take for 94% of a sample to decay?

asked Dec 18, 2013 by sreemathi.v

1 answer

Which of these changes with time for $1^{st}$ order reaction $(i)\;\text{rate of reaction}\\(ii)\;\text{rate constant}\\(iii)\;\text{half life}\\(iv)\;\text{concentration of reactant}$

asked Dec 18, 2013 by sreemathi.v

1 answer

Rate of reaction increases by factor of 10 when temperature increased from $300K$ to 400K.Then find activation energy of reaction

asked Dec 18, 2013 by sreemathi.v

1 answer

The decomposition of hydrogen bromide into hydrogen and iodine is second order reaction.The reaction rate constant is $K=0.08Lmol^{-1}s^{-1}$.How long it take an initial concentration of 0.04M to decrease to half this concentration?

asked Dec 18, 2013 by sreemathi.v

1 answer

At $150^oC$ the decomposition of acetaldehyde to methane is first order reaction. If rate constant for reaction at $750^oC$ is $0.05m^{-1}$, how long does it take a concentration of $0.04\;mol\;L^{-1}$ of acetaldehyde to reduce concentration of $0.03\;mol\;L^{-1}$?

asked Dec 18, 2013 by sreemathi.v

1 answer

What is the rate constant for a reaction of $(CH_3)_3CBr$ with water is represented below :$CH_3)_3CBr+H_2O\rightarrow (CH_3)_3COH+HBr$ where the following data was obtained experimentally:

asked Dec 18, 2013 by sreemathi.v

1 answer

If a reactant is used up according to a first order rate equation and initial concentration of reactant is $32mol\;L^{-1}$ what is concentration of reactant after six half lives have passed?

asked Dec 18, 2013 by sreemathi.v

1 answer

Consider the following reaction:- <p> Step (i): $H_2O_2+I^-\rightarrow H_2O+IO^-$, </p> <p> Step (ii): $H_2O_2+IO^-\rightarrow H_2O+O_2+I^-$, </p> then reaction intermediate will be

asked Dec 18, 2013 by sreemathi.v

1 answer

Addition of catalyst to reaction increases the rate because it

asked Dec 18, 2013 by sreemathi.v

1 answer

Which one of following changes would result in greatest increase in reaction rate in the following two-step mechanism?

asked Dec 18, 2013 by sreemathi.v

1 answer

Consider following reactions :(i) $H_2(g)+I_2(g)\rightarrow 2HI(g),(ii)\;2Mg(s)+O_2(g)\rightarrow 2MgO(s),(iii)\;CaCO_3(s)+2H^+(aq)\rightarrow Ca^{+2}(aq)+H_2O(l)+CO_2(g)$.When we increase surface area will increase reaction rate in

asked Dec 18, 2013 by sreemathi.v

1 answer

For following potential energy diagram : True statement is :-

asked Dec 18, 2013 by sreemathi.v

1 answer

The rates in order of fastest to slowest for this reaction: a 5g of powdered $Mg(s)+2HCl(aq)\rightarrow MgCl_2(aq)+H_2(g)$ are:

asked Dec 18, 2013 by sreemathi.v

1 answer

Consider the following reaction: $\large\frac{1}{2}$$H_2(g)+\large\frac{1}{2}$$Cl_2(g)\rightarrow HCl(g)$ $\Delta H=20KJ$.The activation energy for formation of HCl is 150KJ.Then activation energy for decomposition of HCl will be

asked Dec 18, 2013 by sreemathi.v

1 answer

Integrate : $ \int \large\frac{\sin x}{1-\sin x}$$dx$

asked Dec 17, 2013 by meena.p

1 answer

Integrate: $\int \large\frac{(x^3+5x^2-3)}{(x+1)}$$dx$

asked Dec 17, 2013 by meena.p

1 answer

Integrate : $ \int \large\frac{1}{(x)^{5/2}}$$dx$

asked Dec 17, 2013 by meena.p

1 answer

The distance between the parallel planes $2x+3y+4z=5\:\:and\:\:4x+6y+8z=12$ is ?

asked Dec 17, 2013 by rvidyagovindarajan_1

1 answer

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

asked Dec 17, 2013 by meena.p

1 answer

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