Question

Which one from the following given statements is true:
(I) Sodium carbonate can be prepared by Solvay process.
(II) Crystals of sodium hydroxide are deliquescent.
(III) $NaHC{O}_3$ is a mild antiseptic for skin infections.
(IV) Dead burnt plaster is hemihydrate of calcium sulphate.
(V) $CaC{O}_3$ is used in manufacturing of high quality paper.

• A. Four
• B. Three
• C. Two
• D. One

Answer 1

The correct option is D One

Solvay process cannot be used to prepare potassium carbonate because potassium bicarbonate is fairly soluble in water and does not precipitate out OR because potassium bicarbonate is easily soluble to be precipitated when the ammonium bicarbonate is added to a saturated solution of potassium chloride. Sodium carbonate can be prepared by Solvay process whereas potassium carbonate cannot be prepared by this process.

Deliquescent substances keep absorbing water until they dissolve into liquid solutions. Soluble salts are examples of deliquescent substances. Examples are ammonium chloride, sodium nitrate, calcium chloride, and potassium oxide.

NaHCO3 is used as a mild disinfectant.

Dead burnt plaster is an anhydrous form of calcium sulfate

CaCO3 is used in paper mill ass a filler material. It is used as a better optical brightener. Using Titanium dioxide gives better results than CaCO3.