What will happen if we combine the solution of sodium iodide and the solution of lead(ii) nitrate?
a. the solutions will mix, so all of the ions will be evenly distributed throughout the entire solution.
b. but sometimes mixing solutions containing dissolved ions leads to a precipitation reaction: the formation of a new insoluble compound.

option B. But sometimes mixing solutions containing dissolved ions leads to a precipitation reaction: the formation of a new insoluble compound.

Explanation:

i believe the answer is true.

hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.  

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.