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  • Question

  • The hottest part of the gas flame is known as


  • Options
  • A. luminous zone
  • B. dark zone
  • C. blue zone
  • D. non-luminous zone

  • Correct Answer
  • non-luminous zone 

    • Chemistry problems

    Search Results

    • 1. The luster of a metal is due to

    • Options
    • A. its high density
    • B. its high polishing
    • C. its chemical inertness
    • D. presence of free electrons
      • Discuss
    • 2. The number of waves in n x 10th Bohr's orbit are

    • Options
    • A. n2
    • B. n
    • C. n-2
    • D. n3
      • Discuss
    • 3. The largest production of mica in Asia is from


    • Options
    • A. Indonesia
    • B. Malaysia
    • C. Myanmar
    • D. India
      • Discuss
    • 4. The imaginary axis at which the earth rotates remains inclined at an angle of ____ to the plane of earth's orbit.


    • Options
    • A. 44 1/2 °
    • B. 55 1/2 °
    • C. 66 1/2 °
    • D. 0 °
      • Discuss
    • 5. The groundwater can become confined between two impermeable layers. This type of enclosed water is called


    • Options
    • A. artesian
    • B. artesian well
    • C. unconfined groundwater
    • D. confined groundwater
      • Discuss
    • 6. The high reactivity of fluorine is due to

    • Options
    • A. its high electro negativity
    • B. small size of fluorine atom
    • C. availability of d-orbitals
    • D. strong F - F bond
      • Discuss
    • 7. The hardest form of carbon is

    • Options
    • A. coke
    • B. graphite
    • C. diamond
    • D. charcoal
      • Discuss
    • 8. The main use of salt in the diet is to

    • Options
    • A. make the taste of food better
    • B. produce in small amounts the hydrochloric acid required for the digestion of food
    • C. ease the process of cooking
    • D. increase the solubility of food particles in water
      • Discuss
    • 9. The gas used in the manufacture of vanaspati from vegetable oil is

    • Options
    • A. hydrogen
    • B. oxygen
    • C. nitrogen
    • D. carbon dioxide
      • Discuss
    • 10. The names of the scientists, Newlands, Mendeleev, and Meyer are associated with the development of

    • Options
    • A. atomic structure
    • B. metallurgy
    • C. periodic table of contents
    • D. discovery of elements
      • Discuss

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