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  • Question

  • The mineral containing both magnesium and calcium is


  • Options
  • A. magnesite
  • B. calcite
  • C. carnallite
  • D. dolomite

  • Correct Answer
  • dolomite 

    • Chemistry problems

    Search Results

    • 1. The organic reaction represented by equation CH3 - CH = O + H2NOH gives CH3 - CH - NH + H2O is an example of

    • Options
    • A. an addition reaction
    • B. a condensation reaction
    • C. an oxidation reaction
    • D. an elimination reaction
      • Discuss
    • 2. The metal that is used as a catalyst in the hydrogenation of oils is

    • Options
    • A. Ni
    • B. Pb
    • C. Cu
    • D. Pt
      • Discuss
    • 3. The nucleus of an atom consists of

    • Options
    • A. electrons and neutrons
    • B. electrons and protons
    • C. protons and neutrons
    • D. All of the above
      • Discuss
    • 4. The gas present in the stratosphere which filters out some of the sun's ultraviolet light and provides an effective shield against radiation damage to living things is

    • Options
    • A. helium
    • B. ozone
    • C. oxygen
    • D. methane
      • Discuss
    • 5. The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is

    • Options
    • A. 1.568 x 103
    • B. 6.023 x 1019
    • C. 4.84 x 1017
    • D. 6.023 x 1023
      • Discuss
    • 6. The graphite rods in the nuclear reactor

    • Options
    • A. react with U to release energy
    • B. produce neutrons
    • C. undergo combustion which triggers the nuclear fission
    • D. convert fast moving neutrons into thermal neutrons
      • Discuss
    • 7. The molecules of which gas have highest speed?

    • Options
    • A. H2 at -73oC
    • B. CH4 at 300 K
    • C. N2 at 1,027oC
    • D. O2 at 0oC
      • Discuss
    • 8. The number of g-molecule of oxygen in 6.02 x 1024CO molecules is

    • Options
    • A. 1 gram of molecule
    • B. 0.5 gram of molecule
    • C. 5 gram of molecule
    • D. 10 gram of molecule
      • Discuss
    • 9. The main buffer system of the human blood is

    • Options
    • A. H2CO3 - HCO3
    • B. H2CO3 - CO32-
    • C. CH3COOH - CH3COO-
    • D. NH2CONH2 - NH2CONH+
      • Discuss
    • 10. The isomerism which exists between CH3CHCI2 and CH2CI. CH2CI is

    • Options
    • A. chain isomerism
    • B. functional group isomerism
    • C. positional isomerism
    • D. metamerism
      • Discuss

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