Multiple choice Which of the following combinations of salts and their uses is incorrect? Silver nitrate - To develop photographic films Calcium carbonate - In marbles for flooring Sodium bicarbonate - To make chalk Ammonium nitrate - In explosives Sodium carbonate - In detergents Reveal answer Fill a bubble to check yourself C Correct answer Explanation Calcium carbonate is used to make chalk. Sodium bicarbonate is used in bakery and medicines.