Pure metals are . used less often than alloys

are more resistant to corrosion than alloys

used more often than alloys

harder than alloys

Pure metals are those metals that have not been alloyed with other metallic elements; commercially pure metals are 99% pure minimum.

Explanation:

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.

i think so it’s will be b yes i believe its