Alkali

Q. Distinguish between base and alkaline

Q. Wasps’ stings contain

1. hydrochloric acid
2. acetic acid
3. methanoic acid
4. an alkali.

Q.

What is the difference between an alkali and a base?

Q.

Is KOH an acid or base?

Q.

NaOH and KOH are ____ which are water soluble base.

1. Amphoteric
2. Neutral

3. True

4. False

Q.

What is the common name of water soluble bases ?

Q.

Which of the following statements is true regarding acids and bases?

1. Acids and bases dont react with each other.

2. Acids mixed with bases neutralize each other.

3. Acids mixed with bases make stronger acids.

4. Acids mixed with bases make stronger bases.

Q.

What do you understand by an alkali?

Give two examples of :

(a) strong alkalis, (b) weak alkalis.

Q.

Classify bases on the basis of their concentration, acidity and ionisation. Explain with examples in case.

Q.

Question 9

Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is (are) true about slaking of lime and the solution formed?

(i) It is an endothermic reaction
(ii) It is an exothermic reaction
(iii) The pH of the resulting solution will be more than seven
(iv) The pH of the resulting solution will be less than seven

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

Q.

What is a base? Give an example.

Q.

State the terms defined by the following sentences :

(a) A soluble base.

(b) The insoluble solid formed when two solutions are mixed together.

(c) An acidic solution in which there is only partial ionization of the solute molecules.

Q. Hydrochloric acid reacts with sodium hydroxide to form sodium chloride and water. The heat of neutralisation of this reaction is

1. –51 kJ/mol
2. –57 kcal/mol
3. –13.7 kcal/mol
4. –13.7 kJ/mol

Q. What are the terms defined in (i) and (ii) below?
(i) A salt containing a metal ion surrounded by other ions or molecules.
(ii) A base which is soluble in water.

Q. All alkalis are bases, but all bases are not alkalis.

1. True
2. False

Q.

Neutralisation reaction takes place between an acid and a base.

1. True
2. False

Q. Write an equation for the reactions of hydrochloric acid on :​ (c) caustic soda solution

Q.

Classify bases on the basis of their strength.

Q.

In the laboratory preparation, calcium hydroxide is preferred than other caustic alkalis. Explain why.

Q.

Which of the following is an example of a basic salt solution?

1. CH₃COONa (aq)

2. NH₄Cl (aq)

3. ${\mathrm{AlCl}}_3\left(\mathrm{aq}\right)$

4. ${\left({\mathrm{NH}}_4\right)}_2{\mathrm{SO}}_4\left(\mathrm{aq}\right)$

Q.

Write two examples of each of the following:

(ii) Basic salts

Q. Is ethanol neutral or amphoteric

Q. What do you understand by an alkali?

Q.

What is the difference between: ​
An alkali and a base​

Q.

Lime water can be neutralized by water.

1. True
2. False

Q.

Natrium is the Latin name for the metal ____________ (Potassium/ sodium)

Q. The gas which dissolves in water to form a base is

1. carbon dioxide
2. sulphur dioxide
3. nitrogen dioxide
4. ammonia

Q.

Detergents are salts of -

1. strong acid and strong base

2. strong acid and weak base

3. weak acid and strong base

4. weak acid and weak base

Q.

_______ is olfactory indicator.

1. Onion extract

2. Tomato juice

3. Tea

4. Vinegar oil

Q. You are provided with the following chemicals:​ $NaOH,N{a}_{2}C{O}_3{H}_{2}O,Zn(OH{)}_2,C{O}_2,HCl,Fe,H_{2}S{O}_4,C{l}_2,Zn$ Using suitable chemicals from the given list only, state briefly how you would prepare:​ (b) Sodium sulphate