Chemistry bits for SSC, Banks and for all competitive exams

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1.              What is the name of the scientist who stated that matter can be converted into energy?
               – Einstein

2.              The isotopes of chlorine with mass number 35 and 37 exist in which ratio?
   – 3 : 1

3.              A gas is found to have the formula (CO)n. Its vapour density is 70. What must the value of n be?
  – 5

4.              Which law directly explains the law of conservation of mass?
    – Avogadro’s law

5.              To whom the credit for the discovery of transuranic element goes?
– Seaborg

6.              How many moles are there is 140 g of Si (atomic mass of silicon is 28)?
– 5

7.              Which substance does not have a melting point?
– Glass

8.              By which a mixture of sand and naphthalene can be separated?
– sublimation

9.              An element X forms an oxide X03. What is the valency of X?
– 6

10.          Sodium carbonate crystals lose water molecules. What is this property called?
– Efflorescence

11.          By whom was the law of constant proportions enunciated?
– Proust

12.          What is the number of unpaired electrons in carbon atom?
– 2

13.          In an atom the order of filling up of the orbitals is governed by which principle?
– Aufbau principle

14.          Regarding the atom of a chemical element, magnetic quantum number refers?
– Orientation

15.          What are the atoms of the elements having same mass number but different atomic number called?
– isobars

16.          Rutherford’s scattering experiment related to the size of which thing?
– nucleus

17.          By whom was the absolute value of charge on electron determined?
 – R.A. Millikan

18.          Which property of the elements is a whole number?
– Atomic number

19.          Discovery of the nucleus of an atom was due to the experiment carried
out by which person?
– Rutherford

20.          What are the atoms of the elements which have same number of neutrons
called?
– Isotones

21.          Whose experiment proved that the speed of light was always the same?
–Michelson and Morley

22.          Which element has two electrons in the K-shell only?
– Helium

23.          What is Electromagnetic radiation with maximum wavelength?                                                          
          – Radio Waves

24.          Which nuclear particles responsible for holding all nucleons together?
– Mesons

25.          In which process, a nucleus spontaneously breaks down by emitting
radiation?
– Radioactive decay

26.          In atomic reactors, graphite is used as which name?
– Moderator

27.          Why is Cobalt-60 commonly used in radiation therapy?
–Because it emits gamma rays

28.          A radioactive substance has a half life of four months. Three-fourth of the
substance would decay in howmany months?
– 8 months

29.          What is a bond formed by the transfer of electrons between atoms of the
elements called?
– ionic bond

30.          What is a bond formed by sharing of electrons between atoms of the
elements called?
– covalent bond
  
31.          What is the maximum number of hydrogen bonds in a H2O molecule?
– 4

32.          Select the compound in which chlorine shows oxidation state + 7?
– HClO4

33.          What is the oxidation of two Cl atoms in bleaching powder Ca(OCl) Cl?
– +1,–1

34.          What is the Oxidation state of Mn in acidic KMnO4 change from?
– +7 to+2

35.          Why is Molten NaCl good conductor of electricity?
– Free ions

36.          What is the common oxidation state of alkali metals in the combined
state?
– +1

37.          What is the oxidation number and covalency-of sulphur in S8?
– 0, 2

38.          Starch iodide paper is used to test for the presence of which agent?
–Oxidising agent

39.          The pH of water at 25° C is 7. When it is heated to 100°C, what will the pH
of water?
– increases

40.          When Metal carbonate reacts with dilute acids, what does it forms?
– CO2

41.          The element common to all the acids is known as which name?
–Hydrogen

42.          What is the sum of pH and pOH in aqueous solution at 25°C?
– 14

43.          By what factor is a solution with pH = 2 more acidic than one with pH = 6 ?
– 104

44.          Red litmus paper is changed into blue in solution of which thing?
– Base

45.          What is formed by dissolution of base or acid in water?
– Exothermic

46.          Blue litmus paper is converted into red in solution of which thing?
– acid

47.          According to Arrhenius theory of an acid and base, an acid is a substance
that gives which ions in water?
– H+ ions

48.          What is the negative logarithmic value of hydrogen on called?
– pH

49.          What are the physical state of dispersion medium of a cloud ?
– Gas

50.          Vander Wall’s equation explains the behaviour of which gases?
– real gases


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