Question

Find the name of a soluble salt which contains and releases $O{H^ - }$ ions.
A) Metal.
B) Halogens.
C) Alkali.
D) Actinides.

Answer 1

Hint: We need to know that the solubility of a substance mainly depends on the pressure, volume and temperature of the system which also depends on the chemical as well as physical properties of a compound. 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.

Complete step by step answer:
To begin with, we see what is base and is attributes.
As per Arrhenius hypothesis, Bases are the substances which give hydroxide particles when separated in a fluid arrangement. A model 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.
Some of the examples are Zinc hydroxide and calcium hydroxide.
Bases are not dissolved in water.
Now, we discuss the alkalis.
Alkalis are water soluble bases. For the most part, the term soluble base is utilized to speak to the ionic salts of basic earth metals or antacid metals which have fundamental characters. Calcium hydroxide, Magnesium hydroxide, Sodium hydroxide are a portion of the instances of a salt.
The dissociation equation is,
$NaOH \to N{a^ + } + O{H^ - }$
Thus, water soluble bases are called an alkali. Water soluble bases give hydroxyl ions and these ions give the alkalinity to the solution which increases the ${\text{pH > 7}}$ .
Metals:
We need to know that the metals are materials holding or having the attributes of being sparkly, hard, fusible, flexible, pliable, and so on scarcely any instances of metals (materials) are Gold, Silver, Aluminum, Copper, Iron, and so on
Halogens:
We must remember that the halogens are the most receptive components since they have higher electronegative qualities. All things considered, it has five electrons in the valence cell. To get steady electronic setup incandescent light requires just a single electron which makes it exceptionally pulled in to the electron.
Actinides:
We have to remember that in the actinide series, actinium is a first element. The atomic number of acidine series ranges from $89$ to $103$ . We need to know that the elements belong to the actinide series, all are having radioactive nature which means on radioactive decay they release huge amounts of energy.

So, the correct answer is Option C.

Note: 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 salt but rather all soluble bases will be bases.
Base neutralizes acid while soluble base delivers hydroxyl particles.