Question 2 (0.04 points) Which description about covalent compounds is correct?
A) Covalent (or molecular) compounds generally have higher melting points.
B) Covalent (or molecular) compounds conduct electricity in their molten state.
C) Basic structure unit of covalent (or molecular) compounds is NOT molecules.
D) Covalent (or molecular) compounds generally have lower melting points and
tend to be gases, liquids, or low-melting solids.

the equation that correctly represent the reaction for formation of ammonia is

n2+ 3h2 → 2nh3 (answer d)

1 mole of nitrogen gas (n2) react with 3 moles of hydrogen gas (h2) to form 2 moles of ammonia ( nh3). this is in a process known as haber process were iron is used as a catalyst and reaction take place that a higher temperature and pressure. the process is exothermic hence energy is released.

a is the correct answer

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.