General Awareness

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General Awareness – Chemistry

1-Bohr’s theory is valid for any atom or ion having one electron.

                                                              Niels Henrik David Bohr

2-The sub states in a stationary state are called atomic orbitals.

3-Orbitals having same energy are called degenerate sub shells.

4-The shape of s orbital is spherical.

5-The shape of p orbital is dumb bell.

6-Rutherford proposed planetary model based on his alpha particles scattering experiment.

                                                              Ernest Rutherford

7-Quantum theory of radiation is proposed by Max Planck.

                                                                     Max Planck

8-The number of sub-shells present in L-shell is 2.

9-The distance between the nucleus and outermost orbital gives the atomic radius.

10-The number of states present in the sub stationary stage of g is 9.

11-The number of states present in the sub stationary state ‘d’ is 5.

12-The  ‘ l ‘(L) value for the O-Sub-shell is 2.

13-The units of atomic radius are Angstrom.

14-The unit of ionisation energy is electron volt.

15-Elements of atomic numbers from 57 to 71 are called Lanthanides.

16-Elements of atomic numbers between 89 to 103 are called Actenides.

17-All inert gases are placed in zero group in the periodic table.

     Eight-column form of periodic table, updated with all elements discovered to 2014

18-The term transition elements in the periodic table applies to d block elements.

19-Addition of oxygen to a given compound is called Oxidation.

20-The first classification of elements is attempted by Dobereiner.

                                                        Johann Wolfgang Döbereiner

21-The modern periodic table has 7 periods.

22-The seventh period of periodic table is incomplete.

23-In a group the electronegativity decreases from top to bottom.

24-Addition of hydrogen to a given compound is called reduction.

25-According to modern periodic law the properties of elements are a periodic function of their electronic configuration.

26-According to Mendeleef the properties of elements are a periodic function of their atomic weights.

                                                        Dmitri Ivanovich Mendeleev

27-The ionisation energy reaches a maximumvalue for inert gases.

28-Electronegativity is represented on Pauling’s electronegativity scale.

29-The most electropositive element is Cesium.

30-The electronegativity of fluorine is 4.

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