Answer:
Hydrogen bonding is a special type of dipole-dipole interaction that occurs between the lone pair of a highly electronegative atom (typically N, O, or F) and the hydrogen atom in a N–H, O–H, or F–H bond.
Answer: The mass percent of carbon in acetylene is 92.31 %.
Explanation:
In
, there are 2 carbon atoms and 2 hydrogen atoms.
To calculate the mass percent of element in a given compound, we use the formula:

Mass of carbon = 
Mass of acetylene = 
Putting values in above equation, we get:-

Hence, the mass percent of carbon in acetylene is 92.31 %.
because a postive and negative can be used in. ion
Answer:
the second statement,the third&the fifth