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Answer: O2 has a bond order of 2 calculated from molecular orbital theory as (8-4)/2 = 2.
Answer: FeCl3 reacts with NaOH to form Fe(OH)3, which is a reddish-brown precipitate.
Answer: NH3 has three bonding pairs and one lone pair on nitrogen, giving a trigonal pyramidal shape.
Answer: HCl is a strong acid, so [H+] = 0.001 M = 10^-3 M, giving pH = 3.
Answer: H+ is electron-deficient and accepts electron pairs, making it an electrophile.
Answer: BF3 has an incomplete octet on boron and can accept an electron pair, making it a Lewis acid.
Answer: Ethene undergoes hydration in acidic medium to form ethanol via electrophilic addition.
Answer: In Fe2O3, two iron atoms balance three oxygen atoms (each -2), so iron is +3.
Answer: Al2O3 is amphoteric and reacts with both acids and bases to form salts and water.
Answer: Carbon is 12 g/mol out of total 16 g/mol for CH4, giving 12/16 x 100 = 75%.
Answer: NH3 has a lone pair of electrons on nitrogen that it can donate, making it a Lewis base.
Answer: H2 donates electrons and reduces other substances while itself getting oxidized.
Answer: V2O5 catalyzes the oxidation of SO2 to SO3 in the Contact process for sulfuric acid production.
Answer: NaCl has a face-centered cubic structure where each ion is surrounded by 6 ions of opposite charge.
Answer: 2-Butanol has a chiral carbon bonded to four different groups, making it optically active.
Answer: In Al2O3, two aluminium atoms balance three oxygen atoms (each -2), so aluminium is +3.
Answer: Nylon-6,6 is formed by condensation of adipic acid and hexamethylenediamine with loss of water.
Answer: Kp = Kc(RT)^dn where dn = 2 - 4 = -2, so Kp = Kc(RT)^-2.
Answer: Sulfur in SF6 is bonded to 6 fluorine atoms with no lone pairs, giving a steric number of 6.
Answer: OH- has lone pairs and a negative charge, enabling it to donate electrons to electron-deficient centers.