CDS Chemistry Questions

Q58. Which one of the following is not explained by the Dalton's atomic theory?

Q11. In which of the following colloids is the dispersing medium a liquid?

Q12. The two isotopes of elemental chlorine are :

Q13. Which one among the following metals is not stored under oil?

Q14. Potassium nitrate is not used :

Q16. Which one among the following statements for the gases mentioned below is not correct?

Q17. Match List-I with List-II and select the correct answer using the code given below the Lists : List-I (Trade Name) — List-II (Chemical Name) A. Bleaching powder — 1. Sodium bicarbonate B. Baking soda — 2. Sodium carbonate, 10 water C. Washing soda — 3. Calcium oxychloride D. Plaster of Paris — 4. Calcium sulphate, ½ water Code :

Q18. Which one among the following statements is not true for glass?

Q19. Which one among the following is responsible for determining the chemical properties of an element?

Q20. Which one among the following is used in bleaching of paper?

Q41. Which one among the following substances is a compound?

Q42. What is the total number of naturally occurring elements?

Q43. Which one of the following statements regarding acids is not correct?

Q52. Which one of the following is not true for anodizing process?

Q53. Naphthalene burns with a yellow sooty flame. This is because

Q15. Consider the following statements about Tincture of Iodine: 1. It is an antiseptic solution. 2. Iodine is kept in alcohol-water mixture. 3. Concentration of iodine is very low. How many of the above statements is/are correct?

Q100. Silver articles turn black when kept in the open for longer time due to the formation of