(1) According to the classification of materials, glass belongs to inorganic nonmetallic materials, coins belong to metal materials, paper cups are made of paper, and round tables belong to wood products, so C is selected;

(2)① Colorless phenolphthalein test solution turns red when it meets alkaline substances, so the answer to this question is: colorless phenolphthalein test solution, sodium hydroxide solution;

(2) Sodium carbonate can react with calcium hydroxide to produce white precipitate of calcium carbonate, thus making the solution milky white, so the answer to this question is: Ca (OH) 2+Na2CO3 ═ CaCO3 ↓+2NaOH.

So, the answer is: (1) c; (2)① Colorless phenolphthalein test solution; Sodium hydroxide solution;

②Ca(OH)2+NaCO3═CaCO3↓+2NaOH[ or Ba(OH)2+H2SO4═BaSO4↓+2H2O, etc. ]