6. Although the batteries in "electric cars are different, most cars still use lead storage batteries.
Which statements are true about a lead storage
battery? Choose all correct answers.

a. It is rechargeable by reversing the reaction
that occurs in it.

b. It contains graphite and lithium.

c. It is also referred to as a dry cell battery.

d. It is a series of electrochemical cells.

e. It is a type of voltaic cell.

f. Chemical reactions occur in the battery.

g. It is used to store excess energy from
solar panels.

fe 55.85 g/mol and h2o 18.02 g/mol.

bcde is the incorrect answer it is a

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.