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✅PHYSICS IMPORTANT CONCEPTS PART-1✅

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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

✅PHYSICS IMPORTANT CONCEPTS PART-1✅

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✔️Important SCIENCE (CHEMISTRY ) ✅. Gases used in welding are ? – Acetylene & Oxygen ✅ Gases used by sea divers for breathing are ? – Oxygen & Helium ✅. Best sources for Vitamin D are? – Sunlight & Fish liver ✅Zinc Phosphide is used as? – Rat Poison ✅. Fuse wire is made up of – Lead and Tin ✅Purest form of Iron is? – Wrought Iron ✅ Radium is extracted from . – Pitchblende ✅ Which agent is as ‘seed’ in artificial rain? – Silver Iodide ✅. Oxides of metals are . – Alkaline ✅ During the process of ‘rusting’ , the weight of iron . –Increases ✅ (metal) is liquid at room temperature. – Mercury ✅ What is the formula of common salt – NaCl ✅. What is the maximum number of electrons that a p-orbital can hold – 6 ✅. What is used in fire extinguisher – Sodium bicarbonate ✅ What is the nature of metal oxides – Basic ✅. Which gas burns with popping sound – Hydrogen ✅ Which metal is used for galvanization – Zinc ✅. What is the nature of bleaching powder – Oxidising agent ✅ Which is stored in Kerosene – Sodium ✅ Phenolphthalein gives which color in acidic medium – Colorless ✅ Which gas is used in cigarette lighters? – Butane ✅. Biogas chiefly contains . – Methane ✅. Chemical used as fixer in Photography is . – Sodium thiosulphate ✅Aspirin is – Acetyl Salicylic Acid ✅ is also known as ‘Stranger Gas.’ – Xenon ✅ Natural rubber is a polymer derived from . – Isoprene

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