Escribe una ecuación balanceada, usando las fórmulas correctas para cada una de las siguientes reacciones: Litio metálico reacciona con agua líquida para formar gas hidrógeno e hidróxido de litio acuoso.
Fósforo sólido reacciona con gas cloro para formar pentacloruro de fósforo sólido.
Óxido de nitrógeno gaseoso reacciona con monóxido de carbono gaseoso para producir gas nitrógeno y gas dióxido de carbono.
Clorato de potasio sólido se calienta para formar cloruro de potasio sólido y gas oxígeno.
Monóxido de carbono gaseoso y gas oxígeno se combinan para formar dióxido de carbono gaseoso.

there are two significant figures.

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.

the answer is a for sure mark brainliest i had got this right on usatestprep