About 106 elements are clearly known so far

·  Elements upto atomic number 92 are occur in nature after that they are artificial and the first synthetic element is Technetium(Z=43)

·  In 106 elements 83 are metals

·  11 are gaseous elements they are 11 elements are gas : H, He, N, O, F, Ne, Cl, Ar, Kr, Xe, Rn 

·  2 elements are liquid : Br and Hg

·  The most abundant metal in earth's crust is Al

·  The most abundant element in earth's crust is oxygen

·  The most abundant element in the human body is hydrogen

·  The element with highest M.P is carbon

·  The element with highest B.P is Rhenium

·  The metal with highest M.P is Tungsten

                                    

IUPAC RULES

 This is off two steps

a) How to give the numbering

b) How to write the name

How to give the numbering

1.Loggest chain rule:

consider longest continuous chain

2.If main chain contains

a) one substituent then lowest number comes for substitutes

b) chain contains two/more substituents then the total number of position of substituents

3.If chain contains functional group,double bond,triple bond,substituent then the numbering is given by following order

functional group>double bond>triple bond>substituent

4.If chain contains tow/more functional groups then given priority according to the table

How to write the name

1.The name of substituent write before the name of main chain along with its position and a small hyphen (-) is inserted between the position and name of substituent

2.If compounds having two/more different substituent then thouse are arranges in alphabetic order(a,b,c,d,........z)

3.If compound having identical substituents at same position then the position should be repeated along with their prefix for (2,3,4,.......) by using (di,tri,tetra,................)

position-number(di,tri,tetra............)+substituent(in alphabetic)+rootword(no of carbons)+ene/yne/functional group+sufixa

EAMCET PREVIOUS PAPER QUESTIONS FORM GASEOUS STATE PART-1

1.The units of electro chemical equivalent is
a) gm coulomb
b) gram amp-1 sec-1
c) gram amp sec-1
d) gram amp-1 sec
2.Which one of the following metals will not reduce water
a) Ca
b) Fe
c) Cu
d) Li
3.When one Faraday current is passed, which of the following would deposit one gram atomic weight of the metal
a) BaCl2
b) NaCl
c) AlCl3
d) CuCl2
4. The chemical reaction taking place at anode is
a) oxidation
b) reduction
c) ionization
d) hydrolysis
5.Copper rod dipped in AgNO3 solution in this process
a) Cu is oxidized
b) Cu is reduced
c) Ag is oxidized
d) none of the aboveEAMCET PREVIOUS PAPER QUESTIONS FORM GASEOUS STATE PART-2
6. 3amperes of current is passed for 4hrs through copper salt solution. The amount of copper deposited is(Cu=63.5)
a) 1.43g
b) 14.3g
c) 16g
d) 143g
7.The weight of silver deposited by passing 241.25 coulombs of current through AgNO3 solution is
a) 0.27g
b) 2.7g
c) 27g
d) 0.54g
8.The number of grams of copper deposited from a solution of CuSO4 by 0.5 F electricity is (Cu=64)
a) 64
b) 6.4
c) 32
d)16
9.which of the following is a poor conductor of electricity
a) CH3 COONa
b) C2 H5 OH
c) NaCl
d) KOH
10.A silver cup is plated with silver by 965 coulomb of electricity. The amount of Ag deposited is
a) 9.89g
b) 107.87g
c) 1.0787g
d) 1.002g