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An element has electronic configuration 2, 8, 18, 1. If its atomic weight is 63, then how many neutrons will be present in its nucleus:
(1) 30
(2) 32
(3) 34
(4)33
ans: 34
Which forms a crystal of Nacl: (1) Nacl molecules (2) Na + and cl - ions (3) Na andcl atoms (4) None of the above Ans: Na + and cl - ions
Polyglycolic acid (PGA) : It is acquired by the chain polymerisation of cyclic dimer of glycolic acid, OH-CH2-COOH.
external treatment of hard water? Demineralisation of British water
ENTHALPY
#questionwhat type of ore find in universe. Give all ores and minirals of Al,Fe,Si,Cu,Mn,Zn,Ca,Ag&Au
the nitride ion in lithium nitride is composed of 7 protons + 10 electrons. how?
giving correct formulas give the reactantsand products in the formation of poly2 butane
Why +ve P.F. gives nuclear instability where as -ve PF gives nuclear stability ?explain .
density of gas is 2.86 ltr.the gas maz be-
Cross linked polymers : 1. These are polymers where monomers unit are crosslinked together to make a three dimensional network polymers. 2. These kind of polymers are hard,
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