Acids, bases and salts
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See all →- What is the pH of pure water at 25\(^\circ\)C? Answer: D. 7 Answer: (D) 7 Pure water is neutral; at 25°C its pH is 7. Below 7 is acidic and above 7 is basic. 1
- What is the chemical formula of Plaster of Paris? Answer: D. CaSO ₄ ·½H ₂ O Answer: (D) CaSO ₄ ·½H ₂ O Plaster of Paris is calcium sulphate hemihydrate, CaSO ₄ ·½H ₂ O, made by heating gypsu... 1
- What is the chemical formula of baking soda? Answer: D. NaHCO3 Answer: (D) NaHCO₃ Baking soda is sodium hydrogen carbonate, NaHCO₃. Na₂CO₃ is washing soda (in its hydrated form). 1