Arrehenius Theory of Acids and Bases

Q.

Do basic solutions also have H⁺(aq) ions? If yes, then why are these basic?

Q.

Is $\mathrm{NaOH}$ an acid or base?

Q.

Nessler's reagent is an aqueous solution which contains

1. Sodium chloride

2. Mercuric chloride

3. Potassium Hydroxide

4. alkalic $K_{2}Hg{I}_4$

Q.

Which of the following are properties of an acid?

1. Acids turn blue litmus red.

2. Acids turn red litmus blue.

3. Acids are bitter in taste.

4. Acids are made using non-metal oxides.

Q. Boric acid is an acid because its molecule

1. Gives up protons

2. Combines with a proton from water molecules

3. Contains replaceable $H^{-}$ ions

4. Accepts $O{H}^{-}$ from water releasing a proton

Q.

Which of the following bases are alkalis?

1. Sodium hydroxide

2. Potassium hydroxide

3. Aluminium hydroxide

4. Copper hydroxide

Q. Question 27.
Which of the following is/are true when HCl(g) is passed through water?
(i) It does not ionise in the solution as it is a covalent compound.
(ii) It ionises in the solution.
(iii) It gives both hydrogen and hydroxyl ion in the solution.
(iv) It forms hydronium ion in the solution due to the combination of hydrogen ion with water molecule.

(a) (i) only
(b) (iii) only
(c) (ii) and (iv)
(d) (iii) and (iv)

Q. Why CO3 2- doesnt have coordinate bond but SO4 2- have

Q.

Coordinate bond is also called ___.

Q.

If a solution turns red litmus blue, its pH is likely to be:

1. 1
2. 4
3. 5
4. 10

Q.

According to Arrhenius, acids release ____ ions in the aqueous solution.

1. NaH₂PO₃

2. NaH₂PO₂

3. NaH₂PO₄

4. Nacl

Q. Which of the following substances will release ${\text{H}}^{+}$ ions when dissolved in water?

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

Q. According to Arrhenius theory, all the given compounds are acids except:

1. $HCl$
2. $H_{2}C{O}_3$
3. $NaCl$
4. $Mg(OH{)}_2$

Q. The mixture of two or more metals is called a/an ________.

1. metalloid
2. alloy
3. non-metal
4. compound

Q. Question 3
Do basic solutions also have ${\text{H}}^{+}$ (aq) ions? If yes, then why are they basic?

Q. $N{H}_3$ cannot release $O{H}^{-}$ ions. Can it be a base?

1. No, a base should ionize in water to form $O{H}^{-}$ ions.
2. Yes, $N{H}_3$ is a proton accepter.
3. Yes, $N{H}_3$ can release OH- ions and hence is a base.
4. No, $N{H}_3$ has hydrogens and hence is an acid.

Q.

If solution X has a pH of 6. Then X is:

1. Strong base

2. Strong acid

3. Weak acid

4. Weak base

Q.

Which of these is an acid-base reaction and releases a gas that turns lime water milky?

1. $CaS{O}_4+HCl\to$

2. $C{H}_{3}COOH+HCl\to$

3. $NaOH+HCl\to$

4. $NaHC{O}_3+HCl\to$

Q. $S^{2-}$ is the conjugate base of $H{S}^{-}$.

1. True
2. False

Q.

Identify which of these are basic:
(i) $CaC{O}_3$
(ii) $NaHC{O}_3$
(iii) $N{H}_3$
(iv) $KOH$
(v) $MgC{l}_2$

1. (i), (ii), (iv), (v)

2. (iv)

3. (i), (ii), (iii), (iv)

4. (iii), (iv)

Q. Which of the following substances will release ${\text{H}}^{+}$ ions when dissolved in water?

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

Q. The pair of valence electrons which participates in bonding is termed as lone pair.

1. True
2. False

Q. Hydroxide ions are held together by :

1. none of the above
2. ionic bond
3. covalent bond
4. both (A) and (B)
   

Q. Water can also act as a proton donor and proton acceptor towards itself. This is referred to as the:

1. condensation of water
2. auto-ionization of water
3. hydrolysis of water
4. none of the above

Q. The bond between the atom of a polar covalent molecule with lone pair of electrons and an ion which accepts the lone pair is known as :

1. coordinate bond
2. covalent bond
3. ionic bond
4. coordinate covalent bond

Q. Which of the following is strongest conjugate base

1. ${\text{ClO}}_{\text{4}}^{\text{-}}$
2. ${\text{HCO}}_{\text{3}}^{\text{-}}$
3. ${\text{P}}^{\text{-}}$
4. ${\text{HSO}}_{\text{4}}^{\text{-}}$

Q. The $pH$ of a solution of sodium hydroxide is 9. What will be its $pH$ when this solution is diluted?

1. Less than 9
2. More than 9
3. Equal to 9
4. Equal to 10

Q. Which of the following substances will release ${\text{H}}^{+}$ ions when dissolved in water?

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

Q. Assertion :When a small amount of an acid (or) base is added to water $pH$ changes. Reason: Addition of acid or base increases the ionization of water.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is incorrect but Reason is correct

Q. Burst the bubbles that contain an Arrhenius base.

1. $HCl$
2. $Mg(OH{)}_2$
3. $NaCl$
4. $NaOH$
5. $KOH$
6. $N{H}_3$
7. $LiOH$
8. $Ca(OH{)}_2$