Chapter 14 Substances in Common Use
- Which diseases are caused by artificial food colours ? Colours used in pickles, jam and sauces contain lead and mercury in small quantities. Regular consumption of these products can be dangerous... 1
- When is said to be the nucleus unstable? Nucleus of certain elements such as uranium, thorium, radium etc. have a property of spontaneously emitting invisible, highly penetrating an... 1
- What is meant by radioactivity? Elements with a high atomic number such as uranium, thorium, radium have a property of spontaneously emitting invisible, high penetrating an... 1
- Match the pairs Saturated brine a. sodium metal free Group A Group B 1. Saturated brine c. crystallization of salt 2. Fused salt a. sodium metal free 3. CaOCl₂ d. oxidation of colour 4. NaHCO₃... 1
- Fill in the blanks . 1. The number of molecules of water of crystallization in washing soda is 10. 2. The chemical name of baking soda is sodium bicarbonate. 3.... 2