Recent questions in Chemistry

In which one of the following, the dispersed phase is a liquid?

asked Dec 14, 2013 by mosymeow_1

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Dalda is prepared form oils by

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Which of the following electrolyte will have maximum flocculation value for $Fe(OH)_3$ sol?

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An example of autocatalysis is

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The disperse phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged respectively. Which of the following statements is not correct?

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Identify the gas which is readily adsorbed by activated charcoal

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Which of the following forms cationic micelles above certain concentration?

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The volume of gases $H_2, \;CH_4, \;CO_2$ and $NH_3$ absorbed by 1 gm of activated charcoal at 298 K are in the order:

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1 answer

Which doesn't cause coagulation of coagulation of colloidal solution?

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The concentration of electrolyte required to coagulate a given amount of $As_2S_3$ sol. is minimum in the case of:

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Colloid of which one fo the following can be prepared by electrical dispersion as well as reduction method?

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Arsenic sulhpide is a negative sol. The reagent with least precipitating power is

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Milk is a colloid in which a

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Which one of the following is an example of homogeneous catalysis?

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The critical micellization concentration(CMC) is

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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

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

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

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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

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

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A sol has positively charged colloidal particles. Which of the following solutions is required in lowest concentration for coagulation?

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Hydrophillic colloids are stable due to

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Point out the incorrect statement

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Which of the following is not applicable to chemisorption?

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

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Which adsorption takes place at low temperature?

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Pd can adsorb in the space between its atoms, 900 times its volume of hydrogen. This porcess is called

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1 answer

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

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1 answer

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

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

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

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

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

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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

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

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

What is the order of reaction of an artificial radioactive decay

asked Dec 13, 2013 by sreemathi.v

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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

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Gaseous phase decomposition of $N_2O$ is given below :

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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

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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

Assertion:In a reversible exothermic,$E_{act}$ of forward $Rx^n$ is lower than that of backward $Rx^n$.Reason :The threshold energy of forward reaction is less than that of backward $Rx^n$

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

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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

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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

Consider the following first order types of $Rx_n$ $x\;\; \underrightarrow {K_1}\;\;A+B,y\;\;\underrightarrow {K_2}\;\;C+D,z\;\;\underrightarrow{K_3}\;\; E+F$ if $50\%$ of $Rx_n$ y was completed when $7.5\%Rx_n$ of x and $87.5\%Rx_n$ of z completed then relation between $K_1,K_2$ & $K_3$

asked Dec 13, 2013 by sreemathi.v

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