Sample QuestionsIonic Equilibrium questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
The aqueous solutions of sodium formate, anilinium chloride and potassium cyanide are respectively.
Answer: B.
View full solution →Which of these is not likely to act as Lewis base?
Answer: A.
View full solution →Which of the following fluro compounds is most likely to behave as a Lewis base?
- A
$BF_3$
- ✓
$PF_3$
- C
$CF_4$
- D
$SiF_4$
Answer: B.
View full solution →Which will make basic buffer?
- A
50 mL of 0.1 M NaOH + 25 mL of 0.1 M $CH_3COOH$
- B
100 mL of 0.1 M $CH_3COOH + 100$ mL of 0.1 M $NH_4OH$
- ✓
100 mL of 0.1 M HCI + 200 mL of 0.1 M $NH_4OH$
- D
100 mL of 0.1 M HCI + 100 mL of 0.1 M NaOH
Answer: C.
View full solution →Conjugate base for Bronsted acids $\mathrm{H_2O}$ and HF are ___________.
- A
$\mathrm{OH}^{-}$and $\mathrm{H}_2 \mathrm{FH}^{+}$, respectively
- B
$\mathrm{H}_3 \mathrm{O}^{+}$and $\mathrm{F}^{-}$, respectively
- ✓
$\mathrm{OH}^{-}$and $\mathrm{F}^{-}$, respectively
- D
$\mathrm{H}_3 \mathrm{O}^{+}$and $\mathrm{H}_2 \mathrm{~F}^{+}$, respectively
Answer: C.
View full solution →View full solution →All metal ions (or) atoms are ………….
The pH of sea water is …………. than 7.
Kidney stones are developed over a period of time due to the precipitation of ………….
Assertion(A): Buffer mixture is the one whose pH remains constant even by addition of strong acid or strong base.
Reason (R): To resist changes in its pH on the addition of an acid or base, the buffer solution should contain both acidic as well as basic components so as to neutralise the effect of added acid or base.
(a) Both A and R are correct and R is the correct explanation of A
(b) Both A and R are wrong
(c) A is correct but R is wrong
(d) A is wrong but R is correct
Assertion(A): A mixture of $CH _3 COOH$ and $CH _3 COONH _4$ is an acidic buffer.
Reason (R): An acidic buffer contains a weak acid and the salt of weak acid with strong base.
(a) A is correct but R is wrong.
(b) A is wrong but R is correct.
(c) Both A and R are correct and R is the correct explanation of A
(d) Both A and R are wrong
View full solution →Assertion(A): pH = 7 signifies pure water.
Reason (R): pH = 7 means it is a neutral solution where$\left[ H _3 O ^{+}\right]\left[ OH ^{-}\right]$
(a) A is correct but R is wrong
(b) A is wrong but R is correct
(c) Both A and R are wrong
(d) A is correct and R does not explain A
View full solution → Assertion(A): The solution of $NH _4 Cl$ has pH value less than 7 .
Reason (R): The salt of weak base $\left( NH _4 OH \right)$ and strong acid $( HCl )$ is acidic in nature, when dissolved in water. So pH value is less than 7 .
(a) Both A and R are correct and R is the correct explanation of A
(b) Both A and R are wrong
(c) A is correct but R is wrong
(d) A is wrong but R is correct
View full solution →Assertion(A): The addition of sodium acetate to acetic acid solution leads to the suppression in the dissociation of acetic acid.
Reason (R): This is due to common ion effect. i.e., $CH _3 COOH$ and $CH _3 COONa ^{-}$both contains $CH _3 COO ^{-}$ion as common.
(a) Both A and R are correct and R is the correct explanation of A
(b) BothA and R are wrong
(c) A is correct but R is wrong
(d) A is wrong but R is correct
View full solution →Define Solubility product.
Define $p ^{ H }$.
View full solution →When aqueous ammonia is added to $CuSO _4$ solution, the solution turns deep blue due to the formation of tetramminecopper (II) complex, $\left[ Cu \left( H _2 O \right)_6\right]_{(a q)}^{2+}+4 NH _{3(a q)} \rightleftharpoons\left[ Cu \left( NH _3\right)_4\right]_{(a q)}^{2+}$ among $HO _2$ and $NH _3$ Which is stronger Lewis base.
View full solution →Identify the conjugate acid-base pair for the following reaction in an aqueous solution.
$HS _{( aq )}^{-}+ HF \rightleftharpoons F _{( aq )}^{-}+ H _2 S _{( aq )}$
View full solution →
Identify the conjugate acid-base pair for the following reaction in an aqueous solution.
$HPO _4^{2-}+ SO _3^{2-} \rightleftharpoons PO _4^{3-}+ HSO _3^{-}$
View full solution →Identify the conjugate acid-base pair for the following reaction in an aqueous solution.
$NH _4^{+}+ CO _3^{2-} \rightleftharpoons NH _3+ HCO _3^{-}$
View full solution →$K _{ sp }$ of $Al ( OH )_3$ is $1 \times 10^{-15} M$. At what pH does $1.0 \times 10^{-3} M Al ^{3+}$ precipitate on the addition of buffer of $NH _4 Cl$ and $NH _4 OH$ solution?
View full solution →| Column-I | Column-II |
| A. $K _{ a }=\frac{\alpha^2 c }{1- c }$ | 1. $pH$ value |
| B. $pH = pK _{ a }+\log \frac{\text { [salt }]}{\text { [acid }]}$ | 2. Buffer capacity |
| C. $\beta=\frac{ dB }{ d ( pH )}$ | 3. Ostwald's dilution law |
| D. $-\log _{10}\left[ H _3 O ^{+}\right]$ | 4. Henderson - Hasselbalch equation |
| Column-I | Column-II |
| A. Orange juice | 1. $pH =11$ |
| B. Ammonia solution | 2. $pH =3$ |
| C. Baking soda | 3. $pH =4$ |
| D. Tomato | 4. $pH =9$ |
| Column-I | Column-II |
| A. $pH =8$ | 1. Soapy water |
| B. $pH =10$ | 2. Drain cleaner |
| C. $pH =12$ | 3. Sea water |
| D. $pH =14$ | 4. Indigestion tablet |
| Column-I | Column-II |
| A. Battery acid | 1. $pH =2$ |
| B. Vinegar | 2. $pH =7$ |
| C. Black coffee | 3. $pH =0$ |
| D. Water | 4. $pH =5$ |
| Column-I | Column-II |
| A. $CH _3 COO ^{-}$ | 1. Very weak acid |
| B. $NH _2{ }^{-}$ | 2. Weak base |
| C. $OH ^{-}$ | 3. Weak acid |
| D. $H _3 O ^{+}$ | 4. Strong base |
Calculate the pH of $0.04 M HNO _3$ solution.
View full solution →QUESIION A lab assistant prepared a solution by adding a calculated quantity of HCl gas at $25^{\circ} C$ to get a solution with $\left[ H _3 O ^{+}\right]=4 \times 10^{-5} M$. Is the solution neutral (or) acidic (or) basic.
View full solution →The concentration of hydroxide ion in a water sample is found to be $2.5 \times 10^{-6} M$. Identify the nature of the solution.
View full solution →Account for the acidic nature of $HClO _4$ in terms of Bronsted - Lowry theory, identify its conjugate base.
View full solution →Discuss the Lowry – Bronsted concept of acids and bases.
Derive an expression for the hydrolysis constant and degree of hydrolysis of salt of strong acid and weak base.
Derive an expression for Ostwald’s dilution law.
The ionization constant of acetic acid is $1.74 \times 10-5$. Calculate the degree of dissociation of acetic acid in its $0.05 M$ solution. Calculate the concentration of acetate ions in the solution and its $pH.$
View full solution →Calculate the degree of ionization of 0.05 M acetic acid If its $pK_a$ value is 4.74. How is the degree of dissociation affected when its solution also contains
- 0.01 M
- 0.1 M HCI
View full solution →What ¡s the $pH$ of $0.001 M$ aniline solution? The ionisation constant of aniline is $4.27 \times 10-10$. Calculate degree of ionization of aniline in the solution. Also calculate the ionisation constant of the conjugate acid of anile.
View full solution →(a) $CH _3 COOH + CH _3 COONa$
(b) $NH _4 OH + NH _4 Cl$
(c) $H _2 CO _3+ NaHCO _3$
(d) $NaOH + NaCl$
View full solution →(a) Baking soda
(b) Tomato
(c) Soapy water
(d) Drain cleaner
(a) Vinegar
(b) Black coffee
(c) Sea water
(d) Orange juice
(a) $F ^{-}$
(b) $CH _3 COO$
(c) $O _2$
(d) $NO _2{ }^{-}$
View full solution →(a) $HNO _2$
(b) HF
(c) $H _2 SO _4$
(d) $CH _3 COOH$
View full solution →(a) $NH _4 OH + NaOH$
(b) $NaOH + NaCl$
(c) $CH _3 COOH + CH _3 COONa$
(d) $CH _3 COOH + CH _3 COONH _4$
View full solution →(a) Orange, Black coffee
(b) Baking soda,, Water
(c) Ammonia, Stomach acid
(d) Bleach , Tomato
(a) $H _3 O _{+}, HCl$
(b) $HSO _4 NO _2$
(c) $HNO _2, H _2$
(d) $HCl ^{-} Cl ^{-}$
View full solution →(a) $BF _3, NH _4^{+}$
(b) $CH _2^{-}, CH _3^{+}$
(c) $Fe ^{2+}, Fe ^{3+}$
(d) $\left( CH _3\right) 3 C ^{+}, CH _2= CH _2$
View full solution →(a) $HNO _3, Ba ( OH )_2$
(b) $CH _3 COOH , HCl$
(c) $H _3 O ^{+}, Cl ^{-}$
(d) $HCl + H _2 SO _4$
View full solution →(a) Orange juice, Tomato juice
(b) Soapy water, Sea water
(c) Water, $H _3 O$
(d) Bleach , Ammonia solution
View full solution →(a) $B F_3, B F_2$
(b) $Fe _2, Fe _3$
(c) $CaO , Mg ( OH )_2$
(d) $SiF _4, SF _4$
View full solution →(a) $NH _3, H _2 O$
(b) ROH, ROR
(c) $CN ^{-}, SCN ^{-}$
(d) $BF _3, H _2 O$
View full solution →(a) $HCl ^{-}, Cl ^{-}$
(b) $H _2 O , H _3 O ^{+}$
(c) $HNO _3, HNO _2$
(d) $H _2 SO _4, HSO _4^{-}$
View full solution →(a) $HNO _3, H _2 SO _4$
(b) $Al ( OH )_3, Mg ( OH )_2$
(c) $CH _3 COOH , HCOOH$
(d) $H _2 O , OH ^{-}$
View full solution →