Phosgene is a substance that is often used to make the padding found in car and airplane seats. It is produced when carbon monoxide and chlorine gas react.
Consider the following reaction:
4 molecules of carbon monoxide (CO) react with 4 molecules of chlorine (CI) to produce
some amount of phosgene (COCI2).
Complete the table below.
Chemical element Number of atoms in the reaction
С
O
СІ
During this reaction, how many molecules of phosgene (COCI) are produced?

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

i think? ?

the answer is d. 74.02

colorless gas, exhibiting a blue glow when placed in an electric field

b) solid

its a type of rock

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.