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  • Question
  • The most important ore of aluminium is


  • Options
  • A. bauxite
  • B. magnetite
  • C. haematite
  • D. monazite

  • Correct Answer
  • bauxite 


  • Chemistry problems


    Search Results


    • 1. The ionisation energy of hydrogen atom in the ground state is x KJ. The energy required for an electron to jump from 2nd orbit to 3rd orbit is

    • Options
    • A. 5x/36
    • B. 5x
    • C. 7.2 x
    • D. x/6
    • Discuss
    • 2. The molecular formula of phosphorous is

    • Options
    • A. P1
    • B. P2
    • C. P3
    • D. P4
    • Discuss
    • 3. The method that cannot be used for removing permanent hardness of water is

    • Options
    • A. adding sodium carbonate
    • B. distillation
    • C. adding caustic soda
    • D. boiling
    • Discuss
    • 4. The octane number of zero is assigned to

    • Options
    • A. 2-methyl octane
    • B. n-heptane
    • C. iso-octane
    • D. 3-methyl octane
    • Discuss
    • 5. The material which can be deformed permanently by heat and pressure is called a

    • Options
    • A. thermoplastic
    • B. thermoset
    • C. chemical compound
    • D. polymer
    • Discuss
    • 6. The nucleus of a hydrogen atom consists of

    • Options
    • A. 1 proton only
    • B. 1 proton + 2 neutron
    • C. 1 neutron only
    • D. 1 electron only
    • Discuss
    • 7. The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?

    • Options
    • A. 3 billion years
    • B. 100 years
    • C. 0.01 minute
    • D. 13 days
    • Discuss
    • 8. The number of electrons presents in H+ is

    • Options
    • A. zero
    • B. one
    • C. two
    • D. three
    • Discuss
    • 9. The inherited traits of an organism are controlled by

    • Options
    • A. RNA molecules
    • B. nucleotides
    • C. DNA molecules
    • D. enzymes
    • Discuss
    • 10. The number of waves made by an electron moving in an orbit having maximum magnetic quantum number is +3

    • Options
    • A. 4
    • B. 5
    • C. 2
    • D. zero
    • Discuss


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