Match the following species with the corresponding conjugate acid.
| Species | Conjugate acid | ||
|---|---|---|---|
| A. | $$ \mathrm{NH}_3 $$ |
1. | $$ \mathrm{CO}_3^{2-} $$ |
| B. | $$ \mathrm{HCO}_3^{-} $$ |
2. | $$ \mathrm{NH}_4^{+} $$ |
| C. | $$ \mathrm{H}_2 \mathrm{O} $$ |
3. | $$ \mathrm{H}_3 \mathrm{O}^{+} $$ |
| D. | $$ \mathrm{HSO}_4^{-} $$ |
4. | $$ \mathrm{H}_2 \mathrm{SO}_4 $$ |
| 5. | $$ \mathrm{H}_2 \mathrm{CO}_3 $$ |
A. $\rightarrow$ (2)
B. $\rightarrow(5)$
C. $\rightarrow(3)$
D. $\rightarrow$ (4)
As conjugate acid $\rightarrow$ Base $+\mathrm{H}^{+}$
A. $\mathrm{NH}_3+\mathrm{H}^{+} \longrightarrow \mathrm{NH}_4^{+}$
B. $\mathrm{HCO}_3^{-}+\mathrm{H}^{+} \longrightarrow \mathrm{H}_2 \mathrm{CO}_3$
C. $\mathrm{H}_2 \mathrm{O}+\mathrm{H}^{+} \longrightarrow \mathrm{H}_3 \mathrm{O}^{+}$
D. $\mathrm{HSO}_4^{-}+\mathrm{H}^{+} \longrightarrow \mathrm{H}_2 \mathrm{SO}_4$
Match the following graphical variation with their description.
| A | B | ||
|---|---|---|---|
| A. |  |
1. | Variation in product concentration with time |
| B. |  |
2. | Reaction at equilibrium |
| C. |  |
3. | Variation in reactant concentration with time |
A. $\rightarrow$ (3)
B. $\rightarrow(1)$
C. $\rightarrow(2)$
A. Graph (A) represents variation of reactant concentration with time.
B. Graph (B) represents variation of product concentration with time.
C. Graph (C) represents reaction at equilibrium.
Match the Column I with Column II.
| Column I | Column II | ||
|---|---|---|---|
| A.. | Equilibrium | 1. | $$ \Delta G>0, K<1 $$ |
| B. | Spontaneous reaction | 2. | $$\Delta G=0$$ |
| C. | Non-spontaneous reaction | 3. | $$\Delta G^\circ =0$$ |
| 4. | $$\Delta G < 0, K > 1$$ |
A. $\rightarrow(2,3)$
B. $\rightarrow$ (4)
C. $\rightarrow(1)$
A. $\Delta G\left(\Delta G^{\ominus}\right)$ is 0 , reaction has achieved equilibrium: at this point, there is no longer any free energy left to drive the reaction.
B. If $\Delta G<0$, then $K>1$ which implies a spontaneous reaction or the reaction which proceeds in the forward direction to such an extent that the products are present predominantly.
C. If $\Delta G>0$, then $K<1$, which implies a non-spontaneous reaction or a reaction which proceeds in the forward direction to such a small degree that only a very minute quantity of product is formed.
Assertion (A) Increasing order or acidity of hydrogen halides is $\mathrm{HF}<\mathrm{HCI}<\mathrm{HBr}<\mathrm{HI}$.
Reason (R) While comparing acids formed by the elements belonging to the same group of periodic table, H-A bond strength is a more important factor in determining acidity of an acid than the polar nature of the bond.
Assertion (A) A solution containing a mixture of acetic acid and sodium acetate maintains a constant value of pH on addition of small amounts of acid or alkali.
Reason (R) A solution containing a mixture of acetic acid and sodium acetate acts as buffer solution around pH 4.75 .