Which element would be expected to have properties similar to argon?

How do i turn 2 s into one in the products

Which statement is true about a catalyst? a: a catalyst decreases the rate of the reaction. b. a catalyst is consumed during a chemical reaction. c. a catalyst lowers the activation energy of a reaction. d. a catalyst increases the reactant concentration during a reaction.

Balance the following reaction. as2s3 + 9o2 → 2as2o3 + so2