Question

Given below are the two statements:
Statement I: Both \[CaC{l_2}.6{H_2}O\] and \[MgC{l_2}.8{H_2}O\] undergo dehydration on heating.
Statement II: \[BeO\] is amphoteric whereas the oxides of other elements in the same group are acidic.
A) Statement I is true but statement II is false
B) Both statement I and statement II are false
C) Statement I is false but statement II is true
D) Both statement I and statement II are true

Answer 1

Hint: A dehydration reaction is defined as the reaction in which there is a loss of water. An amphoteric substance is defined as a chemical compound that has the tendency to act as both an acid and a base.

Complete Step by Step Solution:
A dehydration reaction is a reaction in which loss of water takes place. It is the reverse of the hydration reaction. When \[CaC{l_2}.6{H_2}O\] is heated, the reaction that occurs can be given as follows:
\[CaC{l_2}.6{H_2}O\xrightarrow{\Delta }CaC{l_2} + 6{H_2}O\]
When \[MgC{l_2}.8{H_2}O\] is heated the reaction that takes place is as follows:
\[MgC{l_2}.8{H_2}O\xrightarrow{\Delta }MgCl(OH) + HCl + 5{H_2}O\]
The type of reaction in the above two equations is not a type of dehydration reaction, but it’s a dissociation reaction that is taking place.
In the alkaline earth metals, \[BeO\]is an amphoteric substance, that is it acts as both acid and basic oxide. The rest of other elements present other than \[BeO\] are basic in nature and not acidic.
Therefore, both of the statements that are mentioned above are false.
Hence, option B is the correct answer

Note: A dissociation reaction is a type of reaction in which the complex chemical compounds break down to form simpler compounds. Since there is no loss of water that is taking place on heating of the \[CaC{l_2}.6{H_2}O\] and \[MgC{l_2}.8{H_2}O\] , it is not a dehydration reaction.