Day: May 5, 2022

  1. What is the milk of magnesia?
  2. Name two natural indicators?
  3. Is turmeric an indicator?
  4. Which gas is evolved when metal carbonates or metal hydrogen carbonate reacts with dilute acids?
  5. Is CO2 gas supporter of combustion?
  6. What happens when copper oxide reacts with conc. H2SO4?
  7. Which colour is obtained when CuO reacts with conc. HCl?
  8. What is the colour of pH paper in NaCl solution?
  9. Why does bleaching powder act as bleaching agent?
  10. Name the substance which on treatment with chlorine gives bleaching powder.
  11. Why does it act as disinfectant?
  12. Why is bread, biscuits fluffy?
  13. The acid present in atmosphere of Venus is …….
  14. Enamel is made up of……
  15. Toothpastes are…… nature.
  16. Write the name and chemical formula of the products formed by heating gypsum at 373 k.                                                                   (AI 2010)
  17. Write the names and chemical formula of the products formed by the action of chlorine on slaked lime.                                                   (AI 2010)
  18. During summer season, a milkman usually adds very small amount of baking soda to fresh milk. Give one reason.                         (CBSE  2009)
  19. Name the gas usually liberated when a dilute acid reacts with a metal. What happens when a burning candle is brought near this gas?         (AI 2009C)
  20. Which gas is generally liberated when a dilute solution of hydrochloric acid reacts with an active metal?              (Foreign  2009)
  21. What is the color of litmus in a solution of ammonium hydroxide? (Foreign  2009)