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Important Increasing Order 🌱

✔️ BOND ANGLE :-
(i) CH4 , C2H4 , C2H2
(ii) H2O, NH3 , CH4 , CO2
(iii) H2O, NH3 , CH4 , BH3
(iv) NO2—, NO2 , NO2+
(v) H2Se, H2S, H2O
(vi) AsH3 , PH3 , NH3
(vii) PF3 , PCl3 , PBr3 , PI3
(viii) NF3 , NCl3
(ix) NF3 , NH3 , NCl3
(x) OF2 , OH2 , Cl2O

✔️ MELTING POINT :-
(i) Cs, Rb, K, Na, Li
(ii) Mg, Ba, Sr, Ca, Be
(iii) CaI2 , CaBr2 , CaCl2 , CaF2
(iv) BeCl2 , MgCl2 , CaCl2 , SrCl2 , BaCl2
(v) NaI, NaBr, NaCl, NaF
(vi) CsCl, RbCl, KCl, NaCl
(vii) AlCl3 , MgCl2 , NaCl

✔️ BOILING POINT :-
(i) PH3 , AsH3 , NH3 , SbH3
(ii) H2S, H2Se, H2O
(iii) HCl, HBr, HI, HF
(iv) NH3 , HF, H2O
(v) He, Ne, Ar, Kr
(vi) H2O, D2O
(vii) H2 , Cl2 , Br2

✔️ DIPOLE MOMENTS :-
(i) CCl4 , CHCl3 , CH2Cl2 ,CH3Cl
(ii) NF3 , NH3 , H2O, HF
(iii) Cis-chloropropene, Trans-chloropropene
(iv) p, m, o-dichlorobenzene
(v) CH3I, CH3Br, CH3F, CH3Cl
(vi) NH3 , SO2 , H2O, HF
(vii) H2S, H2O
(viii) HI, HBr, HCl, HF
(ix) PH3 , ASH3 , SbH3 , NH3
(x) H2O, H2O2

IMPORTANT Years In NCERT :-

1731 - Many people of Bishnoi community sacrifice their lives saving trees (Jodhpur)

1770 - Priestley's experiment by Bell Jar, Mice & Mint plant, Candle.

1774 - Discovery of oxygen by Joseph Priestley

1838 - Matthias Schleiden-Cell Theory                                                   

1829 - Theodore Schwann- Cell Theory

1850s -  Before industrialization => more white wing Moth

1854 - Julius von Sachs proved that glucose is formed in photosynthesis & stored as starch.

1855 - "Omnis cellula cellula" by Rudolf Virchow & complete the cell theory.

1856 - 1863 Mendel work on garden pea.

1860 - Hydroponics technique developed by Julie Von Sache

1865 - Mendel publishes his workon inheritance of character

1866 - Down's Syndrome discovered by Langdon Down.

1869 - DNA as a acidic substance was 1st identified by Friedrich Meischer & termed a "Nuclein"

1891 - Fossils of Java man discovered in Java
          - Henking discovered X-body (X-chromosome) in insect. (XO- type sex determination)

1892 - Discovery of TMV by D.J. Ivanowsky

1898 -  M.W. Beijerinck demonstrated infectious nature of TMV
          - Discovery of Golgi Body by Camillo Golgi.

1900 - Rediscovery of Mendel's work by ---> • Hugo de Vries
           • Karl Corrence
           • Tschemark

1902 - Chromosomal theory of inheritance given by Sutton & Bovery.

1905 - Law of limiting factors for plants given by Blackmann

1920 - After Industrialisation => more black moth

1928 - Frederick Griffith's Transformation  experiment on Streptococcus pneumonia bacteria

1933 – 1944 - Avery, Macleod McCarty used transformation principle of Griffith's experiment & concluded that DNA is genetic material.

1938 - Coelacanth/Lobe Fines caught in South Africa ---> Ancestor of amphibia.

1947 - At the time of our independence India's population, was approximately 350 million .

1950 -  Electron microscope invention
            -  Tissue culture started

1951 - Family planning was initiated

1952 - Hershey & Chase experiment more correctly proved that DNA ie genetic material [ unquivocal_proof ]

1953  - Discovery of ribosome by George Palade.
          - S.L Miller Experiment of evolution.
          - Double helical structure model of DNA given by Watson & Crick.

1958 - Matthew Meselson of Franklin Stahl experiment (E. coli in NH4CI medium) proved that DNA replication is semiconservative )
         -  Taylor study on vicia faba plant (used radioactive thymidind and proved  semiconservative nature of DNA)

1960 -  Green Revolution.

1963 - Restriction endonuclease isolated from E. coli.

1963 - Wheat varieties Sonalika f Kalyan Sona (High yield & Disease resistant ) introduced in INDIA

1966 - Derived semi dwarf varieties of rice introduced in India.

1969 - R.H. Whittaker proposed FIVE-KINGDOM Classification

1971 - Discovery of viroids by T.O. Diener
          -  Govt. of India legalised MTP.

1972 - Fluid Mosaic model of plasma membrane by Singer & Nicolson
          - 1st recombinant DNA developed by Stanley Cohen and Herbert Boyer
          - National committee for environmental planning and Coordination was established.
          - Wild life protection act in India.

1974 -  Water Act.  &  also Chipko movement

1980 -  Joint Forest movement

1981 - Air act.
           - AIDS was fired reported
           - Intrinsic growth rate of India (r= 0.0205) 

1983 - Eli Lilly American company human Insulin from E. coli.

1984 - Bhopal Tragedy
          - Ministry of Environment amd Forest.

1986 - Environment Act (NEPA)

1987 - Noise included in air pollution  
          - Montreal protocol (Canada)

1988 - National Forest Policy

1989 -  Montreal Protocol became effective.

1990 -  Delhi ranked 4th among 41 most polluted cities.

1990 - First clinical gene therapy was given to 14 yr old girl with ADA deficiency eye.
- Human Genome Project (HGP) launched.

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