Frequently Asked Questions - Chemistry

1. Which metal is least reactive?

2. Which element's ions are most soluble in salts?

3. Which element can be used for treatment/purification of water?

4. Which metal can be cut with a knife?

5. Which metal is the best conductor of heat?

6. Which chemist discovered neon in 1898 by cooling air to liquid state, then heating it?

7. Who is credited with the discovery of neutron?

8. J.J. Thomson received the Nobel Prize in Physics for the discovery of which particle?

9. Who discovered benzene?

10. Who discovered radium?

11. Who first classified elements in the form of a periodic table?

12. What is the atomic number of Chromium (Cr)?

13. Carbon is an element of which group and period?

14. Which group of elements have 7 electrons in their outermost shell?

15. How many natural elements are there in the periodic table?

16. What is the name of the chemical element having atomic number 31?

17. Which element has atomic number 87?

18. How many electrons does a Group-16 element have in its outermost shell?

19. How many protons are there in the nucleus of Lithium (Li)?

20. What is the mass of oxygen in pure water obtained from any source?

21. How many litres of volume does one mole of an ideal gas occupy at 273 K and 1 ATM pressure?

22. How much oxygen is there for every 1.00 gram of carbon monoxide (CO)?

23. What is the mass number of titanium (Ti)?

24. To which group in the periodic table does iron (Fe) belong?

25. What is the position of non-metals in the periodic table?

26. Which group in the periodic table is in the second column from the right and contains fluorine, chlorine, bromine, iodine, astatine and tennessine?

27. The name of which element is derived from an Anglo-Saxon word and its symbol comes from the Latin word Aurum?

28. Which group of elements in the periodic table includes fluorine, chlorine, bromine and iodine?

29. What is the chemical symbol of arsenic?

30. Which liquid can dissolve noble metals like gold and platinum?

31. What is the mass number of potassium (K)?

32. How many electrons are there in the outermost shell of a halogen?

33. What is the chemical symbol of curium?

34. Which metal is used in LED semiconductor technology?

35. What is the atomic number of Einsteinium (Es)?

36. In which block are metals, metalloids and non-metals found in the modern periodic table?

37. How many natural isotopes does carbon have?

38. Isotopes of an element have different numbers of which particles?

39. How many isotopes does Scandium (Sc) have?

40. Protium, Deuterium and Tritium are naturally occurring isotopes of which element?

41. Which isotope is used in the treatment of cancer?

42. Which isotope is used as fuel in a nuclear reactor?

43. Which acid is present in vinegar?

44. What is the acid found in oranges?

45. Salt, sodium nitrite, spices and vinegar are a type of what?

46. What is the chemical formula of vinegar?

47. What substance is commonly used for treating ant bites?

48. Which acid destroys the bacteria entering the stomach?

49. What is the chemical formula of muriatic acid?

50. In terms of nutrients, tyrosine, glycine and ornithine are types of what?

51. A mixture of 5–8% acetic acid in water is known as what?

52. Which acid is used in the purification of gold and silver?

53. Which acid is found in spinach?

54. What is the pH value of normal milk?

55. What is the pH value of Milk of Magnesia?

56. What is the pH value of pure water?

57. What is the pH value of acidic substances?

58. What is the nature of toothpaste?

59. Acid changes blue litmus paper into which colour?

60. What colour does litmus solution turn when it is neither acidic nor alkaline?

61. Alkali changes the colour of red litmus paper into which colour?

62. What colour does red litmus paper change to when dipped in soapy water?

63. The ball-and-spring model of chemical bonds obeys which law?

64. In which year did Niels Bohr propose a theory for the hydrogen atom based on quantum theory?

65. Which law states that the volume of a gas increases with its absolute temperature?

66. When was Mendeleev's periodic table published?

67. Which law states that the product of pressure and volume remains almost constant?

68. Which law states that deformation is proportional to the deforming force?

69. Which scientist created the triad of three elements in 1817?

70. Which law explains that sealing soft drink and soda bottles at high pressure increases the solubility of CO₂?

71. Who opposed the phlogiston theory of the identity of hydrogen and oxygen elements?

72. Who gave the Law of Octaves?

73. Which is the most abundant salt in ocean water?

74. What is the chemical formula of quicklime?

75. What is the chemical formula of soda lime?

76. What is the chemical formula of borax?

77. What is the chemical formula of magnesium oxide?

78. What is the chemical name/formula for sodium hydrogen carbonate?

79. What is the correct chemical formula of calcium hydroxide?

80. What is the chemical formula of propyne?

81. What is the chemical formula of hydrochloric acid?

82. What is the chemical formula of baking soda?

83. What is the other name of marsh gas?

84. What is another name for Epsom salt?

85. What substance is used to eliminate permanent hardness in water?

86. What is the chemical formula of gypsum?

87. What is the chemical name of deadly poison cyanide?

88. What is the chemical name of limestone?

89. What other element besides stannic oxide and copper is present in cassiterite?

90. Gunmetal is made of which alloy?

91. Which is a main component of German silver?

92. After some days, brass and bronze statues turn green. What is the reason?

93. Which chemical compound is present in the hard plastic used to make drinking-water bottles and other household items?

94. Which scientist invented Kevlar?

95. Which fibre is used to make bulletproof jackets?

96. Which fibre is used to make brush bristles?

97. Which polymer is used to insulate parts of electrical equipment?

98. What is meant by Bakelite?

99. Which is used to make light but strong plastic?