Recent questions tagged chemistry

If $\beta_1, \beta_2$ and $\beta_3$ are stepwise formation constants of $MCl, MCl_2, MCl_3$ and K is the overall formation constants of $MCl_3$, then (charges ommitted) :

asked Nov 15, 2013 by mosymeow_1

1 answer

For the following gaseous equilibria X, Y and Z at 300 K. $X: 2SO_2 + O_2 \rightleftharpoons 2SO_3$ $Y: PCl_5 \rightleftharpoons PCl_3 + Cl_2$ $Z: 2HI \rightleftharpoons H_2 + I_2$ ratio of $K_p$ and $K_c$ in the increasing order is:

asked Nov 15, 2013 by mosymeow_1

1 answer

The equilibrium constant $K_c$ for the reaction of $H_2$ with $I_2$ is 57.0 at 700 K $ H_2(g) + I_2(g) \rightleftharpoons 2HI $; $K_c$ = 57 at 700K. select correct statement:

asked Nov 15, 2013 by mosymeow_1

1 answer

What is the Equilibrium constant for the formation of one mole of gaseous $HI$ from the $H_2(g)$ and $I_2(g)$?

asked Nov 15, 2013 by mosymeow_1

1 answer

What are the units of Equilibrium equations $K_p$ and $K_c$ when $\Delta n_g < 0$ respectively ?

asked Nov 15, 2013 by mosymeow_1

1 answer

what would be the expression in place of ? in the Van't Hoff equation: $ log \frac{K_2}{K_1} = \frac {\Delta H^\circ}{2.303R} [?]$

asked Nov 15, 2013 by mosymeow_1

1 answer

Which of the following is incorrect about relationship between $K_p$ and $K_c$?

asked Nov 15, 2013 by mosymeow_1

1 answer

Which of the following dashed line represents the position at equilibrium for the concentration-time plot of a reaction??

asked Nov 15, 2013 by mosymeow_1

2 answers

For the reaction $ 2A(g) + B(g) \rightleftharpoons 3C(g) + 4D(g)$ Three moles each of $A$ and $B$ were taken into a $1\; L$ flask. which of the following is always true when the system attains equilibrium?

asked Nov 13, 2013 by mosymeow_1

1 answer

The equilibrium constant for the reaction $ A + 2B \rightleftharpoons 2C $ is 40. The Equilibrium constant for the reaction $ C \rightleftharpoons B + 1/2 A$ is

asked Nov 13, 2013 by mosymeow_1

1 answer

The equilibrium constant for the reaction $CaSO_4.5H_2O (s) \rightleftharpoons CaSO_4.3H_2O (s) + 2H_2O (g)$ is equal to

asked Nov 13, 2013 by mosymeow_1

1 answer

The equilibrium constant for a reaction; $ A+B \rightleftharpoons C+D $ is $ 1 \times 10^{-2} $ at 298 K is 2 at 373 K. The chemical process resulting in the formation of C and D is

asked Nov 13, 2013 by mosymeow_1

1 answer

Specify the unit of Equlibrium Constant of the following reaction. $ Fe^{3+} (aq) + SCN^- (aq) \rightleftharpoons Fe(SCN)^{2+} (aq) $

asked Nov 13, 2013 by mosymeow_1

1 answer

Which of the following expression acquires constant value at equilibrium for the process shown below?

asked Nov 13, 2013 by mosymeow_1

1 answer

Why does the solubilities of anhydrous salts decrease with increase in temperature?

asked Nov 13, 2013 by mosymeow_1

1 answer

Which of the following can exist beyond critical temperature and critical pressure?

asked Nov 13, 2013 by mosymeow_1

1 answer

What happens to a solid whose vapour pressure reaches 760 mm Hg at temperatures which are lower than the triple point?

asked Nov 13, 2013 by mosymeow_1

1 answer

At the boiling point of a liquid its ________ becomes equal to the atmospheric pressure.

asked Nov 13, 2013 by mosymeow_1

1 answer

As melting of ice is an _ process, supplying heat to the system shifts the equilibrium in the direction and viceversa.

asked Nov 13, 2013 by mosymeow_1

1 answer

A three digit number n is such that the last two digits of it are equal and differ from the first. Then number of such n's is :

asked Nov 11, 2013 by meena.p

1 answer

Which one of the following pairs of reactants does not form oxygen when they react with each other?

asked Nov 11, 2013 by meena.p

0 answers

Which of the following is not correct ?

asked Nov 11, 2013 by meena.p

0 answers

Match the following lists:

asked Nov 11, 2013 by meena.p

0 answers

Which of the following is not correct ?

asked Nov 11, 2013 by meena.p

0 answers

Which of the following is not correct?

asked Nov 11, 2013 by meena.p

0 answers

The compound prepared by a substitution reaction of benzene is :

asked Nov 11, 2013 by meena.p

1 answer

In which of the following reactions, $MgO$ is not formed?

asked Nov 11, 2013 by meena.p

1 answer

The pH of a solution of $H_2O_2$ is $6.0$. some chlorine gas is bubbled into this solution. Which of the following is correct ?

asked Nov 11, 2013 by meena.p

0 answers

Which of the following is a pair of functional isomers?

asked Nov 11, 2013 by meena.p

0 answers

Which of the following is not correct ?

asked Nov 11, 2013 by meena.p

0 answers

At $550 K,$ the $K_c$ for the following reaction is $10^{4}\;mol^{-1}\;L$

asked Nov 11, 2013 by meena.p

0 answers

Which of the following compounds is soluble in benzene but almost insoluble in water?

asked Nov 11, 2013 by meena.p

1 answer

Observe the following reaction : $2A +B \longrightarrow C$. The rate of formation of C is $2.2 \times 10^{-3}\;mol \;L^{-1} min ^{-1}.$ What is the value of $-\large\frac {d[A]}{dt}$ (in mol $L^{-1}\; min^{-1}$)?

asked Nov 11, 2013 by meena.p

0 answers

Which of the following is not correct ?

asked Nov 11, 2013 by meena.p

0 answers

Which of the following is not an air pollutant ?

asked Nov 11, 2013 by meena.p

0 answers

What is the quantity of electricity (in Coulombs) required to deposit all the silver from 250 mL of 1 M $AgNO_3$ solution ?

asked Nov 11, 2013 by meena.p

1 answer

Assertion (A) : The pH of a buffer solution containing equal moles of acetic acid and sodium acetate is 4.8 ($pK_a$ of acetic acid is 4.8). Reason (R) : The ionic product of water at $25^{\circ}C$ is $10^{-14}\;mol^{2}.L^{-2}.$

asked Nov 11, 2013 by meena.p

0 answers

Which of the following is not correct ?

asked Nov 11, 2013 by meena.p

0 answers