Recent questions tagged easy

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

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

asked Dec 14, 2013 by mosymeow_1

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

asked Dec 14, 2013 by mosymeow_1

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

asked Dec 14, 2013 by mosymeow_1

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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

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

asked Dec 14, 2013 by mosymeow_1

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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

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Hydrophillic colloids are stable due to

asked Dec 14, 2013 by mosymeow_1

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Point out the incorrect statement

asked Dec 14, 2013 by mosymeow_1

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Which of the following is not applicable to chemisorption?

asked Dec 14, 2013 by mosymeow_1

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

asked Dec 14, 2013 by mosymeow_1

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Which adsorption takes place at low temperature?

asked Dec 14, 2013 by mosymeow_1

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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

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

asked Dec 14, 2013 by mosymeow_1

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$\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

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

asked Dec 14, 2013 by meena.p

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

asked Dec 13, 2013 by meena.p

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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

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$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

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Select correct statement :

asked Dec 13, 2013 by sreemathi.v

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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

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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

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

asked Dec 13, 2013 by meena.p

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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

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

asked Dec 13, 2013 by meena.p

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

asked Dec 13, 2013 by meena.p

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

asked Dec 13, 2013 by sreemathi.v

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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

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$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

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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

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

asked Dec 13, 2013 by meena.p

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

What is the order of reaction of an artificial radioactive decay

asked Dec 13, 2013 by sreemathi.v

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Gaseous phase decomposition of $N_2O$ is given below :

asked Dec 13, 2013 by sreemathi.v

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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

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

asked Dec 13, 2013 by sreemathi.v

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

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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

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$t_{1/4}$ 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

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

asked Dec 13, 2013 by meena.p

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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

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

asked Dec 12, 2013 by meena.p

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

asked Dec 12, 2013 by meena.p

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