Allotropic Forms MCQ

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

• What percentage of Earth’s mass is sulfur?
  ক

  3%

  খ

  5%

  গ

  0.032%

  ঘ

  2%
• Who first recognized sulfur as an element?
  ক

  John Dalton

  খ

  Humphry Davy

  গ

  Louis Pasteur

  ঘ

  Antoine Lavoisier
• What is the common name of O2SCl2?
  ক

  Sulfur oxochloride

  খ

  Sulfuryl dioxo-dichloride

  গ

  Sulfuryl chloride

  ঘ

  Thionyl chloride
• What is the oxidation number of sulfur in dithionous acid?
  ক

  -3

  খ

  +3

  গ

  +6

  ঘ

  -6
• What is the name of the process of extracting sulfur on commercial scale?
  ক

  Bosch process

  খ

  Boyle process

  গ

  Ostwald process

  ঘ

  Frasch process
• Which of the following is used for vulcanization purposes in the rubber industry?
  ক

  Sulfuric acid

  খ

  Sulfur dioxide

  গ

  Sulfur

  ঘ

  Sulfur trioxide
• When a flask containing sodium thiosulfate is placed over a paper marked with ‘X’ and HCl added to it, the ‘X’ seems to disappear when looked through the flask. Why?
  ক

  Because of formation of sodium chloride

  খ

  Because of sulfur precipitating

  গ

  Because of release of yellowish chlorine gas

  ঘ

  Because of dissolution of sulfur
• What are pyrites known as fool’s good?
  ক

  Because of sulfides

  খ

  Because of lead

  গ

  Because of carbonates

  ঘ

  Because of iron
• Which is a more vital source of elemental sulfur?
  ক

  Oceans

  খ

  Wind

  গ

  Soil

  ঘ

  Volcanoes
• What is the transition temperature of alpha- and beta-sulfur?
  ক

  369 °C

  খ

  369 °F

  গ

  95.9 °C

  ঘ

  95.9 °F
• Which characteristic of crude petroleum is a consequence of sulfur?
  ক

  Acidity

  খ

  Sourness

  গ

  Alkalinity

  ঘ

  Foul odor
• What is the chemical structure and formula of sulfur?
  ক

  S8, S

  খ

  S, S8

  গ

  S, S

  ঘ

  S8, S8
• What is the allotrope of phosphorus in which P-atom completes its octet?
  ক

  Alpha-black phosphorus

  খ

  Beta-black phosphorus

  গ

  White phosphorus

  ঘ

  Red phosphorus
• Which allotrope of phosphorus is also called yellow phosphorus?
  ক

  Black phosphorus

  খ

  Red phosphorus

  গ

  Beta- black phosphorus

  ঘ

  White phosphorus
• White phosphorus can be reconverted to red phosphorus.
  ক

  True

  খ

  False
• Which allotrope of phosphorus does not catch fire easily?
  ক

  White phosphorus

  খ

  Alpha- black phosphorus

  গ

  Beta- black phosphorus

  ঘ

  Red phosphorus
• Like white phosphorus, which phosphorus also exists as P4?
  ক

  Black phosphorus

  খ

  Red phosphorus

  গ

  Phosphine

  ঘ

  Beta-black phosphorus
• Beta-black phosphorus is prepared by heating white phosphorus.
  ক

  True

  খ

  False
• From which type of phosphorus is alpha -black phosphorus formed?
  ক

  Phosphide

  খ

  White phosphorus

  গ

  Black phosphorus

  ঘ

  Red phosphorus
• Red phosphorus is kept under water to protect it from air.
  ক

  True

  খ

  False
• Which allotrope of phosphorus is the most reactive?
  ক

  White phosphorus

  খ

  Metal phosphorus

  গ

  Red phosphorus

  ঘ

  Beta-black phosphorus
• Which allotrope of phosphorus is the most stable?
  ক

  White phosphorus

  খ

  Red phosphorus

  গ

  Black phosphorus

  ঘ

  Phosphine