Recent questions tagged ch4

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

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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

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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

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In a first order reaction,the concentration of the reactant decreases from 0.02M to 0.005M in 10min.The time taken to change the concentration of reactant from 0.16M to 0.025M

asked Dec 16, 2013 by sreemathi.v

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

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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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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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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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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 :

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

1 answer

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

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

1 answer

$t_{1/4}$ 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

1 answer

In an experiment (reactant $\rightarrow$ product) we observe that if we increase the reactant to twice then time taken in the concentration of reaction to drop to $\large\frac{1}{2}$ of its value is reduced to $\large\frac{1}{4}$ then order is

asked Dec 13, 2013 by sreemathi.v

1 answer

A graph between $1/[A]^2$ vs t is plotted below where [A] is conc of [A] at time t and $[A_o]$ is initial conc and K is the rate constant of a $Rx^n$ $nA\rightarrow$ product. What is the half life for the $Rx^n(t_{\large\frac{1}{2}})$

asked Dec 12, 2013 by sreemathi.v

1 answer

A graph between $1/[A]^2$ vs t is plotted below where [A] is conc of [A] at time t and $[A_o]$ is initial conc and K is the rate constant of a $Rx^n$ $nA\rightarrow$ product. What is the initial concentration of [A]

asked Dec 12, 2013 by sreemathi.v

1 answer

A graph between $1/[A]^2$ vs t is plotted below where [A] is conc of [A] at time t and $[A_o]$ is initial conc and K is the rate constant of a $Rx^n$ $nA\rightarrow$ product.What is the value of rate constant

asked Dec 12, 2013 by sreemathi.v

1 answer

A graph between $1/[A]^2$ vs t is plotted below where [A] is conc of [A] at time t and $[A_o]$ is initial conc and k is the rate constant of a $Rx^n$ $nA\rightarrow$ product. What is the order of the $Rx^n$

asked Dec 12, 2013 by sreemathi.v

1 answer

For the reaction $aA+bB\rightarrow cC+dD$ the rate of formation of [C] in term of [A] is given by

asked Dec 12, 2013 by sreemathi.v

1 answer

If $\Delta=\begin{vmatrix}x^n&x^{n+2}&x^{2n}\\1&x^p&p\\x^{n+5}&x^{p+6}&x^{2n+5}\end{vmatrix}=0$ then $p$ is given by

asked Nov 26, 2013 by sreemathi.v

1 answer

Find the value of determinant $\begin{vmatrix}1&x&y+z\\1&y&z+x\\1&z&x+y\end{vmatrix}$

asked Nov 26, 2013 by sreemathi.v

1 answer

If the system of equations $x+2y-3z=1$, $(p+2)z=3$, $(2p+1)y+z=2$ is inconsistent, then the value of $p$ is

asked Nov 26, 2013 by sreemathi.v

1 answer

If the system of equations $ax+y+z=0$, $x+by+z=0$, $x+y+cz=0$, where $(a,b,c\neq 1)$ has a non-trivial solutions, then the value of $\large\frac{1}{1-a}+\frac{1}{1-b}+\frac{1}{1-c}$ is

asked Nov 26, 2013 by sreemathi.v

1 answer

If $A,B,C$ are the angles of a $\Delta$le then the value of the determinant $\small\begin{vmatrix}-1+\cos B&\cos C+\cos B&\cos B\\\cos C+\cos A&-1+\cos A&\cos A\\-1+\cos B&-1+\cos B&-1\end{vmatrix}$ is

asked Nov 25, 2013 by sreemathi.v

1 answer

For all values of $A,B,C$ and $P,Q,R$ the value of the determinant

$(x+a)^3\small\begin{vmatrix}\cos(A-P)&\cos (A-Q)&\cos(A-R)\\\cos(B-P)&\cos(B-Q)&\cos(B-R)\\\cos(C-P)&\cos(C-Q)&\cos(C-R)\end{vmatrix}$ is

asked Nov 25, 2013 by sreemathi.v

1 answer

If $A^k=0$ for some value of k.$(I-A)^P=I+A+A^2+....+A^{k-1}$ thus P is

asked Nov 25, 2013 by sreemathi.v

1 answer

If $A,B$ and $C$ are the angles of a $\Delta$le then $\begin{vmatrix}\sin 2A&\sin C&\sin B\\\sin C&\sin 2B&\sin A\\\sin B&\sin A&\sin 2C\end{vmatrix}$ = $\lambda\sin A\sin B\sin C$, then $\lambda$ is

asked Nov 25, 2013 by sreemathi.v

1 answer

If $A=\begin{bmatrix}3&4\\2&4\end{bmatrix},B=\begin{bmatrix}-2&-2\\0&-2\end{bmatrix}$ then $(A+B)^{-1}$ is equal to

asked Nov 25, 2013 by sreemathi.v

1 answer

The direction of the angular velocity vector is along

asked Nov 25, 2013 by meena.p

1 answer

If $\alpha,\beta,\gamma$ are the cube roots of unity,then the value of the determinant $\begin{vmatrix}e^{\alpha}&e^{2\alpha}&e^{3\alpha}-1\\e^{\beta}&e^{2\beta}&e^{3\beta}-1\\e^{\gamma}&e^{2\gamma}&e^{3\gamma}-1\end{vmatrix}$ is equal to

asked Nov 25, 2013 by sreemathi.v

1 answer

If $A,B,C$ are angles of a triangle then $\begin{vmatrix}e^{2iA}&e^{-iC}&e^{-iB}\\e^{-iC}&e^{2iB}&e^{-iA}\\e^{-iB}&e^{-iA}&e^{2iC}\end{vmatrix}$ is equal to

asked Nov 25, 2013 by sreemathi.v

1 answer

If $E(\theta)=\begin{bmatrix}\cos^2\theta&\cos \theta\sin \theta\\\cos \theta\sin\theta&\sin^2\theta\end{bmatrix}$ and $\theta$ and $\phi$ differ by an odd multiple of $\large\frac{\pi}{2}$ then $E(\theta)E(\phi)$ is a

asked Nov 25, 2013 by sreemathi.v

1 answer

Let $\mid x\mid$ represent the greatest integer less than or equal to $x$ then the value of the determinant $\begin{vmatrix}e & \pi & \pi^{2}-6 \\ \pi & \pi^{2}-6 & e \\ \pi^{2}-6 & e & \pi \end{vmatrix}$ is

asked Nov 25, 2013 by sreemathi.v

1 answer

$l,m,n$ are the $p^{th},q^{th}$ and $r^{th}$ terms of a GP and all positive then $\begin{vmatrix}\log l&p&1\\\log m&q&1\\\log n&r&1\end{vmatrix}$ equals

asked Nov 25, 2013 by sreemathi.v

1 answer

If $A(\theta)=\begin{bmatrix}1&\tan\theta\\-\tan\theta&1\end{bmatrix}$ and $AB=I$ then $(\sec^2\theta)B$ is equal to

asked Nov 22, 2013 by sreemathi.v

1 answer

If $x,y,z$ are different from zero and $\Delta =\begin{vmatrix}a&b-y&c-z\\a-x&b&c-z\\a-x&b-y&c\end{vmatrix}=0$ then the value of the expression $\large\frac{a}{x}+\frac{b}{y}+\frac{c}{z}$ is

asked Nov 22, 2013 by sreemathi.v

1 answer

Inverse of the matrix $\begin{bmatrix}\cos 2\theta&-\sin 2\theta\\\sin 2\theta&\cos 2\theta\end{bmatrix}$ is

asked Nov 22, 2013 by sreemathi.v

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