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Chemistry Questions and Answers

65. Which of the following is the hardest element?
 
  • A. copper
  • B. diamond
  • C. iron
  • D. silicon
 
 
66. The pH of soft drink is
 
  • A. 6.5
  • B. 3.0
  • C. 8.5
  • D. 3.8
 
67. The lime water contains
 
  • A. Ca(OH)2
  • B. NaOH
  • C. KOH
  • D. NH4OH
 
68. The strong acid is
 
  • A. NH4OH
  • B. HCL
  • C. CH3COOH
  • D. NaOH