Peroxides, superoxides and polyatomic ions

27 questions on Peroxides, superoxides and polyatomic ions from the Basic Inorganic Nomenclature and Oxidation Number chapter: 6 NEET level, 11 JEE Main, 10 JEE Advanced. Each one opens with its answer and solution.

• What is the oxidation number of oxygen in hydrogen peroxide, H2O2 (H is +1)? NEET level
• What is the oxidation number of oxygen in potassium superoxide, KO2 (K is +1)? NEET level
• What is the name of the anion ClO4-? NEET level
• What is the name of the anion NO2-? NEET level
• What is the name of Na2S2O3? NEET level
• What is the systematic name of NaHCO3 (hydrogen- prefix for acid salts)? NEET level
• Which one of the following is a true peroxide, i.e. contains the ion O2^2- with O at -1? (In the other three the metal is in its +4 state and the oxide ion is O... JEE Main level
• Potassium ozonide contains the ion O3^-. What is the average oxidation number of oxygen in KO3? JEE Main level
• What is the IUPAC name of K2MnO4 using Stock notation (Roman numeral for the oxidation state of the central atom)? JEE Main level
• Barium hypophosphite is Ba(H2PO2)2. What is the oxidation number of phosphorus in the anion H2PO2- (H is +1, O is -2)? JEE Main level
• The ion S2O8^2- contains one peroxo (O-O) link and both S atoms are in the +6 state. What is its correct name? JEE Main level
• Assertion (A): Sodium superoxide, NaO2, is paramagnetic. Reason (R): The superoxide ion O2^- has an oxidation number of -(1)/(2) on each O atom and contains one... JEE Main level
• Match the anions in Column I with their names in Column II. Column I: (P) OCN-; (Q) SCN-; (R) CN-; (S) N3-. Column II: (1) cyanide; (2) cyanate; (3) thiocyanate... JEE Main level
• In oxygen difluoride, OF2, fluorine is always -1. What is the oxidation number of oxygen? JEE Main level
• In dioxygen difluoride, O2F2 (F is -1), what is the oxidation number of each O atom? JEE Main level
• Select the correct statements about the oxidation number of oxygen (metals in their usual oxidation states). JEE Main level
• In which of the following is the named atom in the +6 oxidation state? (H2SO5 contains one peroxo link, so two of its O atoms are -1 and the other three are -2;... JEE Main level
• Each peroxo link O-O has two O atoms at -1, while all other O atoms are -2. Given the oxidation states S =+6 in H2S2O8 and in H2SO5, Cr =+6 in CrO5, Na =+1 in N... JEE Advanced level
• Diammonium hexafluoridosilicate is (NH4)2[SiF6] (H is +1, F is -1). What is the SUM of the oxidation numbers of all nitrogen and silicon atoms in one formula un... JEE Advanced level
• A binary compound of potassium and oxygen contains 44.8% K by mass (K =39, O =16). Which option correctly gives its formula, the average oxidation number of O a... JEE Advanced level
• For each compound, the oxidation state of the metal is given: S =+6 in K2S2O8 (K =+1), Cr =+6 in CrO5, Pb =+2 (two atoms) and +4 (one atom) in Pb3O4, and Mn =+7... JEE Advanced level
• Select the pairs in which the IUPAC Stock name correctly states the oxidation number of the central metal. JEE Advanced level
• Select the species in which the named central atom has oxidation number +4 (O is -2, F is -1). JEE Advanced level
• Tetrasodium pyrophosphate (diphosphate) has the anion P2O7^4- (O is -2). Which option correctly gives its formula, the oxidation number of P, and the total numb... JEE Advanced level
• Assertion (A): In peroxomonosulfuric acid H2SO5 (one O-O link) the oxidation number of sulfur is +6 and not +8. Reason (R): Two of the five oxygen atoms form a ... JEE Advanced level
• Select the row in which the formula, the name of the acid and the oxidation number of phosphorus are ALL correct (H is +1, O is -2). Rows are written as formula... JEE Advanced level
• Dioxygenyl hexafluoroplatinate, O2[PtF6], is made of the cation O2+ and the anion [PtF6]^- (F is -1). Which option gives the oxidation number of Pt and the aver... JEE Advanced level