Question

[NaCl], $$MgC{l}_2$$ and $$CaS{O}_4$$ are known as:
a.) 1-1, 2-1 and 2-2 type electrolytes respectively.
b.) Strong, weak and strong electrolytes respectively
c.) Electrolytes with different values of A.
d.) Electrolytes with same molar conductivity

Answer 1

Hint: We have to find the charge on the cations and anions that gives the information about the electrolyte type. We should know which chemical is a strong electrolyte and which one is a weak electrolyte.
Strong electrolyte ionizes very easily in water and weak electrolyte will not ionize completely in aqueous solution.

Complete step by step answer:
The given chemical compounds are Sodium chloride ($$NaCl$$), magnesium chloride ($$MgC{l}_2$$) and calcium sulphate ($$CaS{O}_4$$).
Coming to given options.
Split the given chemicals as cations and anions
$$NaCl\to {\underset{+1}{Na}}^{+}+{\underset{-1}{Cl}}^{-}$$
Sodium chloride forms a cation with +1 charge and an anion with -1 charge, so it is a 1-1 type of electrolyte.
$$MgC{l}_2\to {\underset{+2}{Mg}}^{2+}+2{\underset{-1}{Cl}}^{-}$$
Magnesium chloride forms a cation with +2 charge and an anion with -1 charge, so it is a 2-1 type electrolyte.
$$CaS{O}_4\to {\underset{+2}{Ca}}^{2+}+\underset{-2}{S}{O}_4^{2-}$$
Calcium sulphate forms a cation with +2 charge and an anion with -2 charge, so it is a 2-2 type electrolyte.
So, the option A is correct.

Coming to option B, $$MgC{l}_2$$ is strong electrolyte but in option B it is mentioned as weak. So, it is wrong.
Coming to option C, A depends on temperature. So, it is constant at the same temperature. So, option b is wrong. (A- Strength of the electrolyte)

Coming to option D, electrolytes with the same molar conductivity. It is wrong because molar conductivity depends on the number of moles.
So, the correct answer is “Option A”.

Note:To know about the type of electrolyte we have to split the electrolyte into ions based on their charge on the cation and charge on the anion we have to find the type of electrolyte.
The conducting power of all the ions produced by adding one mole of an electrolyte into an aqueous solution is called molar conductivity.