Hydronium Ion

Q.

Is Acetic Acid weak acid or strong acid. Why?

Q. Which of the following has lowest value of pH?

1. Pure water
2. Lemon juice
3. Sodium hydroxide
4. Blood

Q.

(a) Acids dissolve in water and produce positively charged ions. Draw the structure of these positive ions.

(b) Explain why Carbon tetrachloride does not dissolve in water.

(c) Elements Q and S react together to form an ionic compound. Under normal conditions, which physical state will the compound QS exist in ?

(d) Can Q and S, both be metals ? Justify your answer.

(e) The property which is characteristic of an electrovalent compound is that :

A. it is easily vaporized,

B. it has a high melting point,

C. it is a weak electrolyte,

D. it often exists as a liquid.

(f) When a metal atom becomes an ion :

A. it loses electrons and is oxidized,

B. it gains electrons and is reduced,

C. it gains electrons and is oxidized,

D. it loses electrons and is reduced.

Q. Name the:
(a) acidic anhydride of the following acids:
(ii) Nitric acid

Q.

Question 03.
During the preparation of hydrogen chloride gas on a humid day, the gas is usually passed through the guard tube containing calcium chloride. The role of calcium chloride taken in the guard tube is to
(a) absorb the evolved gas
(b) moisten the gas
(c) absorb moisture from the gas
(d) absorb ${\text{Cl}}^{-}$ ions from the evolved gas

Q.

Is hydrochloric acid a strong acid?

Q.

Explain why Hydrochloric acid is a strong acid and Acetic acid is a weak acid, how can it be confirmed?

Q.

What pH is a Weak acid?

Q.

Question 1
You have two solutions, A and B. The pH of solution A is 6 and pH of solution B is 8. Which solution has more hydrogen ion concentration? Which of this is acidic and which one is basic?

Q. What type of bond is formed in hydronium ion, $H_3{O}^{+}$?

1. Ionic bond
2. Covalent bond
3. Coordinate bond
4. Metallic bond

Q.

Bases when dissolved in water produce:

1. Hydronium ions

2. Hydrogen ions

3. Hydroxide ions

4. Peroxide ions

Q. Name the:
(a) acidic anhydride of the following acids:
(iii) Phosphoric acid

Q.

A solution of ${\mathrm{MgCl}}_2$ in Water is

1. $<7$

2. $>7$

3. 7

4. 14.2

Q.

What will be the nature of salt solution of strong acid and weak base?

Q.

Name the ions furnished by :

(a) bases in solution, (b) an acid.

Q.

Why is Benzoic acid the stronger acid than 2-Naphthol?

Q.

Name the cation furnished by an acid in aqueous solution.

Q.

Which of the following cannot show acidic nature?

1. ${\mathrm{H}}_2{\mathrm{CO}}_3$

2. ${\mathrm{CaCO}}_3$

3. $\mathrm{HCl}$

4. ${\mathrm{HSO}}_4^{-}$

Q.

HCI, HN$O_3,C_2{H}_{5}OH,C_6,H_{12}{O}_6$ all contain H atoms but only HCI and $HN{O}_3$ show acidic character. Why ?

Q.

Classify the solutions of the following as acids, bases or salts:

Ammonium hydroxide, Barium chloride, Sodium chloride, Sodium hydroxide, ${\mathrm{H}}_2{\mathrm{SO}}_4$ and ${\mathrm{HNO}}_3$.

Q.

Which of the following compounds is neutral to litmus?

1. ${\mathrm{NaNO}}_3$

2. ${\mathrm{CuSO}}_4.5{\mathrm{H}}_2\mathrm{O}$

3. ${\mathrm{NaHCO}}_3$

4. $\mathrm{Ca}{\left(\mathrm{OH}\right)}_2$

Q.

pH paper strips have imparted purple and dark violet colors to two solutions A and B. Which is more basic?

Q. Hydronium ions are not produced in the aqueous solution of

1. sulphuric acid
2. nitric acid
3. vinegar
4. caustic soda

Q. Which of the following statements about pH and $H^{+}$ ion concentration is incorrect?

1. The addition of one drop of conc HCl solution in $N{H}_{4}Cl$ solution decreases the pH of the solution.
2. A solution of the mixture containing equal moles of each $C{H}_{3}COOH$ and NaOH has a pH of 7.
3. The pH value depends on the concentration of $\left[H^{+}\right]$ ion
4. A cold and concentrated $H_{2}S{O}_4$ has a lower $H^{+}$ ion concentration than a dilute solution of $H_{2}S{O}_4$.

Q. From the given options select the one with the highest pH value.

1. $\text{HCl}$
2. ${\text{H}}_2{\text{SO}}_4$
3. ${\text{H}}_2\text{O}$
4. $\text{NaOH}$

Q.

Why conductivity of dilute $HCl$ is greater than Acetic acid?

Q.

Blue vitriol has

1. Co-ordinate bond

2. Ionic bond

3. Covalent bond

4. All

Q. $H^{+}\text{and}O{H}^{-}$ ions combine to form .

1. $H_3{O}^{+}$
2. $H_{2}O$
3. $H_2{O}_2$

Q.

Explain how hydrochloric acid is a good conductor of electricity.

Q.

The salt obtained when rock salt reacts with conc. Sulphuric acid below $200°C$ is a/an ________ [acid/normal] salt.