Introduction to Reversible and Irreversible Reactions

Q.

$C{H}_{3}COOH\left(l\right)+C_2{H}_{5}OH\left(l\right)\rightleftharpoons C{H}_{3}COO{C}_2{H}_5\left(l\right)+H_{2}O\left(l\right);K_c=4$

In the above reaction, one mole of each of acetic acid and alcohol are heated in the presence of little conc. $H_{2}S{O}_4$. On equilibrium being attained

1. 1 mole of ethyl acetate is formed

2. 2 mole of ethyl acetate are formed

3. 1/2 moles of ethyl acetate is formed

4. 2/3 moles of ethyl acetate is formed

Q.

For the reaction $PC{l}_5$ (g) $\leftrightharpoons$ $PC{l}_3$ (g) + $C{l}_2$ (g) if we start with only a moles of $PC{l}_5$
$\begin{array}{cccc}& PC{l}_5& PC{l}_3& C{l}_2\left(g\right)\\ Molest=0& a& 0& 0\\ MolesAtEq.& a(1-\alpha )& a\alpha & a\alpha \end{array}$
is called the degree of dissociation - True or false?

1. True

2. False

Q. An acidified solution of potassium chromate was layered with an equal volume of amyl alcohol. When it was shaken after the addition of 1 mL of 3% $H_2{O}_2$. a blue alcohol layer was obtained. The blue color is due to the formation of a chromium (VI) compound 'X'. What is the number of oxygen atoms bonded to chromium through only single bonds in a molecule of X?

Q.

$C{H}_{3}COOH\left(l\right)+C_2{H}_{5}OH\left(l\right)\rightleftharpoons C{H}_{3}COO{C}_2{H}_5\left(l\right)+H_{2}O\left(l\right)$

In the above reaction, one mole of each of acetic acid and alcohol are heated in the presence of

little conc. $H_{2}S{O}_4$. On equilibrium being attained

1. 1 mole of ethyl acetate is formed

2. 2 mole of ethyl acetate are formed

3. $\frac{1}{2}$ moles of ethyl acetate is formed

4. $\frac{2}{3}$ moles of ethyl acetate is formed

Q.

For the reaction $PC{l}_5$ (g) $\leftrightharpoons$ $PC{l}_3$ (g) + $C{l}_2$ (g) if we start with only a moles of $PC{l}_5$
$\begin{array}{cccc}& PC{l}_5& PC{l}_3& C{l}_2\left(g\right)\\ Molest=0& a& 0& 0\\ MolesAtEq.& a(1-\alpha )& a\alpha & a\alpha \end{array}$
$\alpha$ is called the degree of dissociation - True or false?

1. True

2. False

Q. The standard Gibbs energy channge at 300 K for the reaction, $2A\rightleftharpoons B+C$ is 2494. 2J. At a given time, the composition of the reaction mixture is $\left[A\right]=\frac{1}{2},\left[B\right]=2$ and $\left[C\right]=\frac{1}{2}.$ The reaction proceeds in the (R = 8.314JK / mol, e = 2.718)

1. forward direction because $Q>K_c$
2. reverse direction because $Q>K_c$
3. forward direction because $Q>K_c$
4. reverse direction because $Q<K_c$

Q.

A reversible reaction is one which :

1. Proceeds spontaneously

2. Proceeds in one direction

3. Proceeds in both directions

4. None of the above