which type of reaction is nh4no3 (s) n2o (g) + h2o (g)?
synthesis
combustion
decomposition
single replacement

Decomposition reaction

Explanation:

Decomposition reaction:

It is the reaction in which one substance is converted into the two or more products.

The decomposition reactions always involved one substance to decompose.

General chemical equation:

AB   →   A + B

The given chemical equation:

NH₄NO₃(s)   →   N₂O (g) + H₂O(g)

Ammonium nitrate is decomposed into nitrous oxide and water vapors.

Balanced chemical equation:

NH₄NO₃(s)   →   N₂O (g) + 2H₂O(g)

when it is rapidly heated it form N₂ and O₂.

2NH₄NO₃   →   2N₂ + O₂ + 4H₂O

By increasing the temperature decomposition is increased and in limited space due to pressure it may cause explosion.

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.