16) 12 Which element is most likely to be used as an industrial catalyst? A Na
B Ni
C Pb
D Sr

particle   p is an electron and particle q is a neutron

water and alcohols have similar properties because water molecules contain hydroxyl groups that can form hydrogen bonds with other water molecules and with alcohol molecules, and likewise alcohol molecules can form hydrogen bonds with other alcohol molecules as well as with water.

answerca air mass;

its b it was a compound