Strong and Weak Acids and Bases

Q.

How do you remember the $7$ strong acids?

Q.

Explain the term alkali?

Q.

NaOH is a strong base because

1. it gives ${OH}^{-}$ ions.

2. it can be oxidised.

3. it can be easily ionised.

4. it can be reduced.

Q.

Question 23.
Which among the following is not a base ?
(a) $\text{NaOH}$
(b) $\text{KOH}$
(c) ${\text{NH}}_4\text{OH}$
(d) ${\text{C}}_2{\text{H}}_5\text{OH}$

Q.

Hydrogen halides of the highest$\mathrm{Pka}$ is?

Q.

All alkalis are bases but all bases are not alkalis. Give reason.

Q.

The element common to all acids is

1. Hydrogen

2. Carbon

3. Sulfur

4. Oxygen

Q.

The correct lewis acid order for boron halides is__________.

Q. What is the chemical formula of these acids ? Acetic acid Citric acid Tartaric acid Oxalic acid Lactic acid Methanoic acid Oleic acid Malic acid Stearic acid Butyric acid Uric acid Ascorbic acid Tannic acid Folic acid

Q.

The correct statement(s) for orthoboric acid is(are)

1. It behaves as a weak acid in water due to self ionization

2. Acidity of its aqueous solution increases upon addition of ethylene glycol

3. It has a three-dimensional structure due to hydrogen bonding

4. It is a weak electrolyte

Q. The ionisation constant of a base (C2H5)N is 6.4*10-5, calculate its degree of dissociation in its 0.1M solution when it is mixed with 0.01M NaOH solution?

Q.

Name the acid present in lemon juice and tomato.

Q.

Which of the following is a weak electrolyte?

1. Sodium chloride

2. Benzene

3. Sodium acetate

4. Ammonium acetate

Q.

A blue litmus paper was first dipped in dil. HCl and then in dil. NaOH solution. It was observed that the color of the litmus paper

1. changed to red.

2. changed first to red and then to blue.

3. changed blue to colorless.

4. remained blue in both the solutions.

Q.

Mark the correct statement.

1. Both bases and alkalis are soluble in water.

2. Alkalis are soluble in water but all bases are not.

3. ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}$ is a base because it has $\mathrm{OH}$ group.

4. Bases are soluble in water but alkalis are not.

Q. Identify Y and Z in the given Venn diagram.

1. Y: Window cleaner; Z: Ascorbic acid
2. Y: Soap; Z: Tartaric acid
3. Y: Oxalic acid; Z: Milk of magnesia
4. Y: Milk of magnesia; Z: Oxalic acid

Q.

Is $\mathrm{KF}$ a weak acid?

Q.

Write the effect of dilute hydrochloric acid on the color of each one of the following indicators.

Blue litmus

Q.

The incorrect statement about acids is

1. they give H⁺ ion in water.

2. they are sour in taste.

3. they turn blue litmus red.

4. they give pink color with phenolphthalein.

Q.

$NaOH$ is a strong base because:

1. It gives ${OH}^{-}$ ions.

2. It can be oxidised.

3. It can be easily ionised.

4. It can be reduced.

Q.

What is the difference between Arrhenius acids and bases?

Q.

Give reason for the following :

Carbon tetrachloride is liquid but does not conduct electricity.

Q.

Discuss briefly the physical and chemical properties of ethanoic acid. [5 MARKS]

Q.

Nitric acid is a very strong monoacidic base.

1. True

2. False

Q.

Classify each of the following electrolytes as strong electrolytes or weak electrolytes:
(i) Sodium hydroxide solution
(ii) Potassiun nitrate solution
(iii) Dilute sulphuric acid
(iv) Acetic acid
(v) Pure sulphuric acid
(vi) Pure water
(vii) Ammonia solution

Q. Which acid is called the king of acids?

Q. Explain strong and weak acid with examples.

Q.

Two acids A and B have pH values 1 and 5 respectively. Which is stronger acid A or B?

Q.

State whether bases conduct electricity or not?

Q.

Define and give two examples of each of the following types of electrolytes.

1. Non-electrolytes
2. Weak electrolytes
3. Strong electrolytes