Selective Leaching MCQ

Test your knowledge with important Selective Leaching MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Selective Leaching MCQs at Bissoy

• Which of the following is/are the benefits of selective leaching?
  ক

  Enrichment of silicon on stainless steel for better passivity

  খ

  Preparation of Raney nickel catalyst

  গ

  Extraction of metals using hydrometallurgy

  ঘ

  Enrichment of silicon on stainless steel for better passivity, preparation of Raney nickel catalyst and extraction of metals using hydrometallurgy
• Which of the following is/are the other names of selective leaching?
  ক

  Dealloying

  খ

  Parting

  গ

  Dealloying and parting

  ঘ

  Neither dealloying nor parting
• Which of the following acid that results in selective removal of aluminum in aluminum bronzes?
  ক

  Hydrochloric acid (HCl)

  খ

  Hydrofluoric acid (HF)

  গ

  Nitric acid (HNO3)

  ঘ

  Hydrochloric, hydrofluoric and nitric acid
• Which of the following type of cast irons that exhibits graphitization?
  ক

  Grey cast iron

  খ

  Nodular cast iron

  গ

  Malleable cast iron

  ঘ

  Grey cast iron, nodular cast iron, and malleable cast iron
• Which of the following phenomenon that results in the dissolution of iron by leaving porous graphite on the surface of grey cast iron?
  ক

  Dezincification

  খ

  Decalcification

  গ

  Graphitization

  ঘ

  Dezincification and graphitization
• Which of the following is/are the preventions of dezincification?
  ক

  Minimizing oxygen concentration

  খ

  Use of less susceptible alloy

  গ

  Adding a small amount of arsenic, antimony

  ঘ

  Removal of oxygen concentration, use of less susceptible alloy and adding a small amount of arsenic, antimony
• Which of the following type of brasses is/are highly prone to localize or plug-type dezincification?
  ক

  Low brasses

  খ

  High brasses

  গ

  Low and high brasses

  ঘ

  Neither low nor high brasses
• Which of the following type of brasses is/are highly prone to the uniform or layer-type dezincification?
  ক

  Low brasses

  খ

  High brasses

  গ

  Low and high brasses

  ঘ

  Neither high nor low brasses
• Which of the following is/are the characteristics of dezincified brass alloy?
  ক

  Weak

  খ

  Permeable

  গ

  Porous

  ঘ

  Weak, permeable and porous
• The Alloying of zinc to copper lowers the corrosion resistance of the copper.
  ক

  True

  খ

  False
• Which of the following is/are the types of dezincification?
  ক

  Layer-type

  খ

  Plug-type

  গ

  Layer-type and Plug-type

  ঘ

  Neither Layer-type nor Plug-type
• What is the percent of zinc that consists of common yellow brass?
  ক

  70%

  খ

  30%

  গ

  40%

  ঘ

  60%
• Selective Leaching is the removal of one element from a solid alloy by the corrosion process.
  ক

  True

  খ

  False