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Chemistry - Quiz 1 - 2nd Sec

1] To get visible spectrum of the hydrogen atom when its electron excited to the third energy level (M) , the electron must …………………                                                                                                                

lose energy less than energy gained
lose energy more than energy gained
lose energy same as energy gained
gain a quantum of energy

2] The amount of energy needed to transfer the valence electron of 19K from its energy level to the higher one   is ……………… the energy lost from the valence             electron of 11Na  when it returns back to its energy level from the higher one

higher than
lower than
equals to
double

 3] In absence of electric field and magnetic field from the tube of cathode rays , the rays ……………..

are not formed
move in straight lines
become positively charged
don't glow
4] If the electron gains energy equal 10.2 eV and it transfers from level K to level L  . So to transfer from   level M to level K  , the electron must  …………………                                                                                                                                                                                                           
lose energy equals 1.89 eV
gain enegy equals 1.89 eV
lose energy equals 18.2 eV
gain enegy equals 18.2 eV
  5] The modern atomic theory modified the inadequacy in Bohr's atomic model by ………….                                                                                                                                                                                                                                                                                                                                                     
The electron has wave property only
The electron is a negative particle only
the electron orbits the nucleus in circular planar orbit
) the electron has a dual nature

   6] " Each of hydrogen and helium atoms contain one energy level " . In the light of this statement , the most correct phrase of the following is …………………

They are equal in number of electrons
They differ in the atomic emission spectrum
they differ in the principal quantum number
They are similar in the atomic emission spectrum

 7] By the application of the wave equation on the last electron of sodium atom  11Na , the most correct  statement from the following that ………………………..                                                                 

It's possible to determine its position accurately in the level M
It moves nearer and farther from the nucleus in the level M
Its energy is less than the energy of the electrons in the L level
The electron transfers to the level L by losing quantum of energy
 8] Alpha particles are made of .....................
2 protons and 2 electrons
4 protons and 4 neutrons
2 protons and 2 neutrons
helium atoms
9] In the atomic emission spectrum of hydrogen , the ............... colored line has  the highest frequency
green
red
violet
blue
 10] The atom in which an electron gains a quantum of energy is known as .......................  .
ground state atom
stable atom
excited atom
atomic emission spectrum
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