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Q321) The atomic number (Z) of an element is 25. In its ground state, how many electrons are present in the "N" shell? [ EAMCET 2001]




SOLUTION

K shell = 2 electrons
L shell = 8 electrons
M shell = 13 electrons
N shell = 2 electrons
Answer: (b)


Q322) In the extraction of zinc, the formation of blue flame is due to the burning of [ Tamil Nadu CET 2002]




SOLUTION


Answer: (d)


Q323) Copper is extracted from copper pyrite ore by heating in blast furnace. The method is based on the principle that .. [ AFMC 2002]



SOLUTION


Answer:(d)



Q324) general electronic configuration of lanthanide is [ CBSE PMT 2002]



SOLUTION


Answer: (a)


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