Which of the following pairs is correctly matched?
Answer and explanation
Correct answer: Baking soda — Sodium hydrogen carbonate
Baking soda is sodium hydrogen carbonate, with the formula \\(\mathrm{NaHCO_3}\\); therefore, option A is correct. Washing soda is sodium carbonate decahydrate, \\(\mathrm{Na_2CO_3\cdot 10H_2O}\\), not calcium sulphate. Bleaching powder is calcium oxychloride, whereas plaster of Paris is calcium sulphate hemihydrate. Exam tip: memorise common salt names together with their chemical formulae.
Frequently asked questions
What is the correct answer to this question?
Baking soda — Sodium hydrogen carbonate
Why is this the correct answer?
Baking soda is sodium hydrogen carbonate, with the formula \\(\mathrm{NaHCO_3}\\); therefore, option A is correct. Washing soda is sodium carbonate decahydrate, \\(\mathrm{Na_2CO_3\cdot 10H_2O}\\), not calcium sulphate. Bleaching powder is calcium oxychloride, whereas plaster of Paris is calcium sulphate hemihydrate. Exam tip: memorise common salt names together with their chemical formulae.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
