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Q. What is Base units?
There are seven base units given in SI. A base unit is a unit of calculate that is based on an object or event in the physical world. Lists of the seven SI base units their abbreviations and the quantities they are used to measure.
SI Base Units
Time
second (s)
Length
meter (m)
Mass
kilogram (kg)
Temperature
kelvin (K)
Amount of a substance
mole (mol)
Electric current
ampere (A)
Luminous intensity
candela (cd)
SI is based on a decimal system consequently are the prefixes in next table which are used to extend the range of SI units.
Maximum number of electrons present in N shell is: (1) 18 (2) 32 (3) 2 (4) 8 Ans: 32
The quantum number which may be designated by s, p, d, and f instead of number is: (1) n (2) l (3) m 1
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Calculation of Equivalent Weight ofEDTA
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which factor on electron affinity depend?
The maximum number of electrons that can be accommodated in the M th shell is: (1) 2 (2) 8 (3) 18 (4) 32 Ans: 18
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