Bronsted Lowry Theory

Q.

What are conjugate acid and base pairs? Explain with examples.

Q.

Which of the following can act both as Bronsted acid and Bronsted base

1. Cl^-

2. HCO₃^-

3. H₃O⁺

4. OH^-

Q. An example of salt of weak acid and weak base and an ezample for salt of strong acid and strong base

Q.

Name one salt whose solution has pH less than 7 and one salt with pH more than 7.

Q.

What is the conjugate base of ${\mathrm{HSO}}_4^{-}$?

Q.

The conjugate base of ${\mathrm{H}}_3{\mathrm{BO}}_3$ is?

1. ${{\mathrm{HBO}}_3}^{2-}$

2. ${\mathrm{H}}_4{\mathrm{BO}}^{3+}$

3. $\mathrm{B}{\left(\mathrm{OH}\right)}^{4-}$

4. ${\mathrm{H}}_3{\mathrm{BO}}^{3-}$

Q. Aqueous solution of FeCl3 is
strong acid
weak acid
strong base
weak base

Q.

Is ${\mathbf{H}}_{\mathbf{3}}{\mathbf{O}}^{\mathbf{+}}$ an electrophile?

Q. Four species are listed below.
$\left(i\right)HC{O}_3^{-}$
$\left(ii\right)H_3{O}^{+}$
$\left(iii\right)HS{O}_4^{-}$
$\left(iv\right)HS{O}_{3}F$
Which one of the following is the correct sequence of their acid strength?

1. $\left(iii\right)<\left(i\right)<\left(iv\right)<\left(ii\right)$
2. $\left(iv\right)<\left(ii\right)<\left(iii\right)<\left(i\right)$
3. $\left(ii\right)<\left(iii\right)<\left(i\right)<\left(iv\right)$
4. $\left(i\right)<\left(iii\right)<\left(ii\right)<\left(iv\right)$

Q. Which molecule will act as both bronsted acid and base?

1. $B{F}_3$
2. $H_{2}O$
3. $C{H}_4$
4. $NaOH$

Q.

What is the conjugate base of ${\mathrm{NH}}_3$?

Q. Which of the following cannot act as Bronsted-Lowry base?

1. $O{H}^{-}$
2. $N{H}_4^{+}$
3. $S{H}^{-}$
4. All three act as a Bronsted-Lowry base

Q. Which is the set of amphiprotic species?

1. $H_{2}P{O}_4^{-},H_{2}P{O}_3^{-},H_{2}O$
2. $H_3{O}^{+},HP{O}_4^{2-},HC{O}_3^{-}$
3. All of these
4. $H_{2}O,HP{O}_3^{2-},H_{2}P{O}_2^{-}$

Q.

What will be the conjugate base of ${\mathrm{OH}}^{-}$ from the following?

1. ${\mathrm{O}}^{2-}$

2. ${\mathrm{H}}_2\mathrm{O}$

3. ${\mathrm{O}}^{-}$

4. ${\mathrm{O}}_2$

Q.

Is ${\mathrm{Na}}^{+}$an acid or a base?

Q. The ionization constant of a weak electrolyte $\left(HA\right)$ is $25\times {10}^{-6}$, while the equivalent conductance of its $0.01\text{M}$ solution is $19.6\text{Scm}2{\text{eq}}^{-1}$. The equivalent conductance of the electrolyte at infinite dilution (in ${\text{S cm}}^2{\text{eq}}^{-1}$) will be:

1. $250$
2. $196$
3. $392$
4. $384$

Q.

What pH is ${\mathrm{NH}}_4\mathrm{Cl}$?

Q. Aromatic amines are insoluble in water because of:

1. the larger hydrocarbon part which tends to retard the formation of H-bonds.
2. the smaller hydrocarbon part which tends to retard the formation of H-bonds.
3. the larger hydrocarbon part which tends to increase the formation of H-bonds.
4. none of these

Q.

Nucleic acid contains:

1. Nitrogenous base and Phosphoric acid

2. Sugar and a nitrogenous base

3. Phosphoric acid and sugar

4. Phosphoric acid, sugar and a nitrogenous base

Q.

The species that can act both as a Bronsted acid as well as a base?

1. Na₂CO₃

2. OH^-

3. H_2­PO₄^-

4. CO₃^2-

Q. The concept that acid is proton donor and base is proton acceptor was given by:

1. Lowry-Bronsted
2. Arrhenius
3. Lewis
4. Faraday

Q. Which of the following is used to reduce phenol vapors to benzene?

1. Hydrogen gas
2. Oleum
3. Zinc dust
4. Anhydrous $AlC{l}_3$

Q. P4 + OH-. = PH3 +. H2PO2 -

Q. Group reagent for the precipitation of group II basic radicals for the qualitative analysis is :

1. $dil.HCl+H_{2}S$
2. $N{H}_{4}Cl\left(\text{solid}\right)+N{H}_{4}OH\left(\text{solution}\right)+H_{2}S$
3. $(N{H}_4{)}_{2}C{O}_3\text{solution}$
4. $\text{None of the above}$

Q. Which of the following cannot act as Bronsted-Lowry base?

1. $O{H}^{-}$
2. $N{H}_4^{+}$
3. $S{H}^{-}$
4. All three act as a Bronsted-Lowry base

Q. Conjugate base for Bronsted acids $H_{2}O$ and $HF$ are :

1. $O{H}^{-}$ and $H_2{F}^{+}$, respectively
2. $H_3{O}^{+}$ and $F^{-}$, respectively
3. $O{H}^{-}$ and $F^{-}$, respectively
4. $H_3{O}^{+}$ and $H_2{F}^{+}$, respectively

Q. Which of the statement given below is incorrect: 1) ONF is isoelectronic with O2N- 2) OF2 is an oxide of flourine 3)Cl2O7 is anhydride of perchloric acid 4) O3 molecule is bent

Q. A solution of sodium bicarbonate in water turns

1. Methyl orange - yellow
2. Methyl orange - Red
3. Blue litmus - Red
4. Phenolphthalein - Pink

Q. Find the product of this reaction:

1. 
2. 
3. 
4. 

Q. Which of the following are conjugate acid-base pairs:

1. $HC{O}_3^{-},C{O}_3^{2-}$
2. $C_6{H}_5\stackrel{+}{N}{H}_3,C_6{H}_{5}N{H}_2$
3. $H_2{C}_2{O}_4,H{C}_2{O}_4^{-}$
4. $O{H}^{-},H^{+}$