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Which one is not the feature of solids?

A. Definite Mass and Volume
B. Frequent Fludity
C. Rigidity
D. Definite Shape



Answer & Solution
Option: B
Explanation : Solid is one of the states of matter

  • Solid have Definite mass, volume, and shape because particles of matter are held together by strong intermolecular forces.
  • Solid have Short Intermolecular distance due to tight close packing.
  • Strong Intermolecular Forces because atoms and molecules are held close together.
  • Solids are incompressible and rigid in nature due to strong intermolecular forces acting on particles which keep them fixed on their positions.
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      Which of the following metals is most reactive?

      A. Sodium (Na)
      B. Magnesium (Mg)
      C. Coper (Cu)
      D. Chlorine (Cl)



      Answer & Solution
      Option: A
      Explanation :Metals can be ordered according to their reactivities.
      1. Potassium (K) 2. Sodium (Na) 3. Calcium (Ca) 4. Lithium (Li) 5. Magnesium (Mg) 6. Aluminum (Al) 7. Zinc (Zn) 8. Iron (Fe) 9. Nickel (Ni) 10. Tin (Sn) 11. Lead (Pb) 12. Copper (Cu)13. Mercury (Hg) 14. Silver (Ag) 15. Gold (Au) 16. Platinum (Pt)
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        Trichlorofluoromethane or CFC-11 is banned by which international protocol/treaty?

        A. Bonn agreement
        B. Montreal Protocol
        C. Cartagena Protocol
        D. Stockholm Convention

        Answer & Solution
        Option: B
        Explanation :Trichlorofluoromethane, also called freon-11, CFC-11, or R-11, is a chlorofluorocarbon. It is a colorless, faint ethereal, and sweetish-smelling liquid that boils around room temperature.
        CFC-11 was phased out under the 1987 Montreal Protocol. Despite being the signatory to the Montreal Protocol, and agreeing to phase out production of CFC-11 in 2010, China continued to emit the polluting gas.
        Between 40 and 60 per cent of total global CFC-11 emissions originate from Eastern China, reveals study. This is no good news for the ozone layer which is on the road to recovery.
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          Which one is called laughing gas?

          A. Ferrous chloride (FeCl2)
          B. Sulphur dioxide (SO2)
          C. Nitrous oxide (N2O)
          D. Ferric hydrogen Fe(OH)3

          Answer & Solution
          Option: C
          Explanation :Nitrous oxide (N2O), also called dinitrogen monoxide, laughing gas, or nitrous, one of several oxides of nitrogen, a colourless gas with pleasant, sweetish odour and taste, which when inhaled produces insensibility to pain preceded by mild hysteria, sometimes laughter.Nitrous oxide was discovered by the English chemist Joseph Priestley in 1772; another English chemist, Humphry Davy, later named it and showed its physiological effect.
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            Mixture of two metals is called

            A. Alloy
            B. Dispersion
            C. Fission
            D. Diffusion

            Answer & Solution
            Option: A
            Explanation :Metallic bonds can occur between different elements. A mixture of two or more metals is called an alloy. Depending on the size of the atoms being mixed, there are two different kinds of alloys that can form: 1. Substitutional alloy 2. Interstitial alloy
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              Which form of phosphorus is used in safety matches?

              A. Yellow Phosphorus
              B. Blue Phosphorus
              C. Red Phosphorus
              D. Purple Phosphorus

              Answer & Solution
              Option: C
              Explanation :Pea sized portions of potassium chlorate and red phosphorus are reacted together by striking with a hammer. Smoke, a loud bang and a flash are observed.
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                Which one is the lightest gas?

                A. Ammonia (NH3)
                B. Nitrogen (N2)
                C. Carbon Dioxide (CO2)
                D. Hydrogen (H2)

                Answer & Solution
                Option: D
                Explanation :Hydrogen and helium, the lightest two gases, weigh so little that helium balloons and hydrogen dirigibles are able to float in the atmosphere. Hydrogen is a diatomic gas, and helium is a monatomic gas. Both hydrogen and helium are lighter than air.
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