Question

All bases are soluble in water.
A. True.
B.False.

Answer 1

Hint: We know that a substance which is used to neutralize an acid is called a base and remember that all alkali is a base but not all bases are alkali. Bases are bitter in nature and which change the red litmus paper into blue and they have a pH value of $8 - 14$.

Complete step by step answer: First, we see what is base and is characteristics.
According to Arrhenius theory, bases are the substances which give hydroxide ion when dissociated in an aqueous solution. An example for a base is $NaOH$.
We know that sodium hydroxide is a strong base completely dissociated into sodium and hydroxide ion.
Now, see the characters of bases.
-Bases are used to neutralize an acid.
-On reaction with acid some bases give water and neutral salt.
-Zinc hydroxide and copper oxide are some of the examples.
-Bases are not dissolved in water.
Now, we discuss the alkalis.
-Alkalis are water soluble bases. Generally, the term alkali is used to represent the ionic salts of alkaline earth metals or alkali metals which have basic characters. Calcium hydroxide, Magnesium hydroxide, -Sodium hydroxide are some of the examples of an alkali.
We can write the dissociation equation as,
$NaOH\xrightarrow{{}}N{a^ + } + O{H^ - }$
Thus, water soluble bases are called an alkali. All bases are not soluble in water. Thus, the given statement is false.
Therefore, option B is correct.

Note: Now we discuss about some of the differences between base and alkalis are,
-Bases are not soluble in water whereas bases which dissolve in water are called alkali.
-All bases are not alkali but all alkalis are bases.
-Base neutralizes an acid whereas alkali releases hydroxyl ion.