Conjugate Acids and Bases

Q. Equivalent weight of $B{\left(OH\right)}_3$ in water

1. $M$
2. $\frac{M}{3}$
3. $\frac{M}{9}$
4. $\frac{M}{6}$

Q.

An aqueous solution of carbonic acid ($H_{2}C{O}_3$) contains

1. 

2. ($H_{2}C{O}_3)only$

3. 

4. 

Q.

Which of the following is the strongest acid?

1. $HClO$

2. $HCl{O}_3$

3. $HCl{O}_4$

4. $HCl{O}_2$

Q.

Review the equilibrium and choose the correct statement

$HCl{O}_4+H_{2}O\rightleftharpoons H_3{O}^{+}+Cl{O}_4^{-}$

1. H₃O⁺ is the conjugate base of H₂O

2. H₂O is the conjugate acid of H₃O⁺

3. ClO₄^- is the conjugate base of HClO₄

4. HClO₄ is the conjugate acid of H₂O

Q.

Which of the following is the strongest conjugate base

1. Cl^-

2. SO₄^--

3. NO₂^-

4. CH₃COO^-

Q. Which of the following statements are correct?

1. The pH of $1.0\times {10}^{-8}$ $M$ solution of $HCl$ is 8
2. The conjugate base of $H_{2}P{O}_4^{-}$ is $P{O}_4^{3-}$
3. The auto-protolysis constant of water increases with temperature
4. When a solution of weak monoprotic acid is titrated against a strong base, then at the half neutralization point $pH=\left(p{K}_a\right)/2$

Q. An alkali is titrated aganist an acid with methyl orange as the indicator, which of the following is a correct combination?

1. Strong base- strong acid- pink to colourless
2. Weak base-strong acid- colourless to pink
3. Strong base- strong base- pinkish red to yellow
4. Weak base- strong acid- yellow to pinkish red

Q.
What is the correct order of decreasing acidic strengths?

1. $H_b>H_c>H_a$
2. $H_a>H_c>H_b$
3. $H_c>H_b>H_a$
4. $H_b>H_a>H_c$

Q. In the dissociation of $N{H}_{4}OH$, if $N{H}_{4}Cl$ is added what will be the change in $pH$ for the $N{H}_{4}OH$ solution ?

1. Decreases
2. first decreases and then increases.
3. Increases
4. No change

Q. The conjugate acid of $N{H}_2^{-}$ is

1. $N_2{H}_4$
2. $N{H}_{2}OH$
3. $N{H}_3$
4. $N{H}_4^{+}$