What happens when hydrogen gas is passed over hot ferric oxide plzz help ​

What semimetal can form four single covalent bonds.

What overall charge must all compounds have

*will mark you brainliest + 15 points ** why does the equilibrium of a system shift when the pressure is increased? a. to maximize the stress on the system b. to stop restoring equilibrium to the system c. to increase the total moles of gas in the system d. to decrease the total moles of gas in the system