Chemistry
X - HCl ⇋ H1+ + Cl- (in solution state)
Y - PbBr2 ⇋ Pb2+ + 2Br1- (in molten state)
From the above reactions X or Y, identify the reaction which exhibits:
(a) electrolytic dissociation
(b) ionization
Chemical Bonding
ICSE 2024
8 Likes
Answer
(a) Y is electrolytic dissociation.
Reason — PbBr2 is an electrovalent compound and its contains lead [Pb2+] and bromide [Br1-] ions that are held together by an electrostatic force of attraction. Melting causes the separation of these ions. Hence, it exhibits electrolytic dissociation.
(b) X is ionization.
Reason — HCl is a polar covalent compound. In gaseous state or pure liquid state, it does not conduct an electric current. When HCl is added to water, formation of Hydronium [(H3O)+] and Chloride [Cl-] ions takes place. Hence, it exhibits ionization.
Answered By
7 Likes
Related Questions
Calcium carbonate reacts with dilute hydrochloric acid as given below:
CaCO3 + 2HCl ⟶ CaCl2 + H2O + CO2
(a) What is the mass of 5 moles of calcium carbonate? (Relative molecular mass of calcium carbonate is 100)
(b) How many moles of HCl will react with 5 moles of calcium carbonate?
(c) What is the volume of carbon dioxide liberated at S.T.P. at the same time?
Identify the gas evolved in each of the following reactions:
(a) Methane undergoes complete combustion.
(b) Copper carbonate is heated.
(c) MnO2 reacts with concentrated HCl.
Give reasons for the following:
(a) Inert gases do not form ions.
(b) Covalent compounds have a low melting and boiling point.
Arrange the following as per the instructions given in the brackets:
(a) Carbon, Fluorine, Beryllium (decreasing order of atomic size)
(b) Sulphuric acid, Phosphoric acid, Acetic acid (increasing order of number of replaceable H atoms per molecule)
(c) Potassium, Lithium, Sodium (increasing order of ionization potential)