Choose the method that will make the microstructure of spheroidite in an iron and carbon steel with eutectoid composition.
start at 900c then cool slowly. afterwards reheat to 800c for over a day.
start with a tempered martensite and heat to 700c for over a day.
start at 900c then cool slowly. afterwards reheat to 700c for over a day.
start with a pearlite and heat to 800c for over a day.

in the analysis of systems that involve fluid flow, we frequently encounter the combination of properties u and pv.

it is stable as it is in group 0 which have full outer shells of electrons

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.