`{:(1.,"Borax","a.","Allotrope of carbon"),(2.,"Graphite","b.",Na_(2)B_(4)O_(7)),(3.,"ZnO","c.","Ozone"),(4.,"CFCs","d.","Neutral oxide"),(5.,NH_(3),"e.","Fertilizer"),(,,"f.","Fixation of nitrogen"):}`

{:(,"Borax bead test",,),(1.,"Copper","a.","Blue"),(2.,"Iron","b.","Grey"),(3.,"Manganese","c.","Red"),(4.,"Cobalt","d.","Bottlegreen"),(5.,"Chromium","e.","Colorless"),(,,"f.","Green"):}

The oxidation number of boron in Na_(2)B_(4)O_(7) is :

{:(1.,"Inert pair effect","a.","Nitric acid"),(2.,"Oxyacid","b.","Cell fuel"),(3.,"Liquid nitrogen","c.","Stabilisation of lower oxidation state"),(4.,"Ostwald process","d.","Ozone"),(5.,"Molecular oxygen","e.","Platinum gauze"),(,,"f.","Refrigerant"):}

{:("Column A" ,"Column B"),((1) CuSO_(4),(a) "Pale green"),((2)FeSO_(4),(b)"Blue"),((3) Na_(2)SO_(4) ,(c) "White"),((4)BaCl_(2),(d)"Milky white"):}

Match the following : {:(,A,,B),((1),K,(a),2.8.1),((2),L,(b),2),((3),M,(c ),2","8.8),((4),"Sodium",(d),18),((5),"Atgon",(e ),8):}

{:("A","B"),("1) Parenchyma","a) Thin walled packing cells"),("2) Photosynthesis","b) Carbon fixation"),("3) Aerenchyma","c) Localized thickenings"),("4) Collenchyma","d) Buoyancy"),("5) Permanent tissue","e) Sclerenchyma"):}

Prove that the ponts A(1,2,3),B(3,4,7),C(-3 ,-2, -5) are collinear