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  • Question

  • 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

  • Correct Answer
  • boiling 

    • Chemistry problems

    Search Results

    • 1. The octane number of zero is assigned to

    • Options
    • A. 2-methyl octane
    • B. n-heptane
    • C. iso-octane
    • D. 3-methyl octane
      • Discuss
    • 2. 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
    • 3. The items amenable to detection by soft x-rays are

    • Options
    • A. contrabands
    • B. lead in bullets
    • C. narcotics
    • D. genuine coins from counterfeit coins
      • Discuss
    • 4. The ore which is found in abundance in India is

    • Options
    • A. monazite
    • B. fluorspar
    • C. bauxite
    • D. magnetite
      • Discuss
    • 5. The mass number of an atom is equal to

    • Options
    • A. the number of protons
    • B. the number of protons and electrons
    • C. the number of nucleons
    • D. the number of neutrons
      • Discuss
    • 6. The molecular formula of phosphorous is

    • Options
    • A. P1
    • B. P2
    • C. P3
    • D. P4
      • Discuss
    • 7. 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
    • 8. The most important ore of aluminium is

    • Options
    • A. bauxite
    • B. magnetite
    • C. haematite
    • D. monazite
      • Discuss
    • 9. 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
    • 10. 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

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