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Chemistry MCQ Questions Se-9

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1. Stoichiometry is based on




2. The chemical name of common salt is




3. The element present in all organic molecules is




4. Brownish film formed on iron when left in open is called?




5. The mass of a mole of NaCl is the




6. Why is argon gas used along with tungsten wire in an electric bulb?




7. Which one of the following elements is used as a timekeeper in atomic clocks?




8. Metals that are liquid at room temperature?




9. Which of the statement(s) about the reaction given below is/are INCORRECT? 2PbO (s) + C (s) ? 2Pb (s) + CO2 (g) I. Lead is getting reduced. II. Carbon is getting reduced. III. Lead oxide is getting reduced.




10. German Silver contains




11. When a chemical bond is broken energy is




12. Liquid sodium is being considered as




13. Brown stains in vessels and clothes indicate the presence of high quantities of ________ in water




14. Which has the lowest freezing point?




15. What element is used to disinfect swimming pools?




16. Which is not a green house gas in the following?




17. Uranium found in Ladakh is an example of which type of resource?




18. Which type of bond is found in sodium bromide?




19. An atom that loses or gains electrons is called




20. Which one of the following elements will be an isobar of calcium if the atomic number of calcium is 20 and its mass number is 40?




21. Which one of the following elements is essential for the formation of chlorophyll in green plants?




22. Which one of the following is a physical change?




23. Isotopes are atoms of the same element that have different




24. Atoms have no electric charge because they




25. Tertiary sewage treatment is designed to remove




26. The chemical name of common salt is




27. Which molecule is nonpolar and has a symmetrical shape?




28. An electron loses potential energy when it




29. Which are two chemicals used to purify water?




30. Which of the following is NOT a waste material removed from blood in the kidney?




31. The temperature at which a solid melts to become a liquid at the atmospheric pressure is called its ___________.




32. Which one of the following statements is not correct?




33. Which properties are characteristic of the group 1 metals?




34. Which compound is an electrolyte?




35. Which equation is an example of a synthesis reaction?




36. ______ gets converted to phosgene, when exposed to sunlight.




37. Arrange the following compounds in order of increasing acidity?




38. The number of electron levels in a magnesium atom is




39. Which base is present in soap?




40. Constantan is an alloy of copper and _______.




41. An element with an atomic number of ___ will form a basic oxide.




42. Which among the following is false about alpha particles?




43. Process of gaining electrons is known as _____.




44. What types of atoms form covalent bonds?




45. Infiltration is the process by which rainwater becomes




46. Name the densest stable element known on earth.




47. Which scientist established the Law of Octaves?




48. Which of the following is NOT a nucleon?