Redox Reactions — practice questions
78 curated practice questions from Redox Reactions (Chemistry Class 11, CBSE) — 78 easy. Every question includes the final answer free; step-by-step worked solutions with a free account.
- Which type of redox reaction is shown by the following reaction?
- In which of the following compounds oxidation state of chlorine has two different values?
- Which of the following are the common oxidising agents used in redox titrations?
- Which compound among the following has lowest oxidation number of chlorine?
- Consider the following reaction : HCHO + 2[Ag(NH 3 ) 2 ] + + 3OH – → 2Ag + HCOO – + 4NH 3 + 2H 2 O Which of the…
- In the following question, a statement of assertion is followed by a statement of reason. Mark the correct choice…
- Given below is a redox reaction. Which of the following types the reaction belongs to?
- The correct sequence of the oxidation state of underlined elements is Na 2 [ Fe (CN) 5 NO], K 2 Ta F 7 , Mg 2 P 2 O 7 …
- Oxidation state of S in H 2 S 2 O 8 is
- Which of the following is not an example of disproportionation reaction?
- Which of the following is a disproportionation reaction?
- The oxidation state of an element in a particular compound can be defined as
- Phosphorus on reaction with NaOH produces PH 3 and NaH 2 PO 2 . This reaction is an example of
- Match the column I with column II with the type of reaction and mark the appropriate choice. Column I Column II (A) 3Mg…
- When KMnO 4 is reduced with oxalic acid in acidic solution, the oxidation number of Mn changes from
- The number of electrons involved in the conversion of MnO 4 – to MnO 2 is
- Match the column I with column II and mark the appropriate choice. Column I (Compound) Column II (Oxidation state of…
- Based on the following reactions, arrange the metals in increasing order of their reduction potentials. Zn + Cu 2+ → Zn…
- Which of the following is not a rule for calculating oxidation number?
- Which of the following oxidation numbers is not correctly matched?
- The oxidation number of Cr in CrO 5 which has the following structure is
- Identify the redox reaction taking place in a beaker.
- What is the oxidation state of P in Ba(H 2 PO 2 ) 2 ?
- The oxidation state of sulphur in the anions SO 3 2– , SO 4 2– , S 2 O 4 2– . S 2 O 6 2– is in the order of
- Examples of few compounds in a particular oxidation state are given. Mark the example which is not correct.
- The pair of compounds in which the metals are in their highest oxidation state is
- If a spoon of copper metal is placed in a solution of FeSO 4 . What will be the correct observation?
- When a piece of sodium metal is dropped in water, hydrogen gas evolved because
- In which of the following compounds carbon is in highest oxidation state?
- What will be the balanced equation in acidic medium for the given reaction? Cr 2 O 7 2– ( aq ) + SO 2( g ) → Cr 3+ ( aq…
- Arrange the following metals in which they displace each other from the solutions of their salts in decreasing order…
- Identify the compounds which are reduced and oxidised in the following reaction: 3N 2 H 4 + 2BrO 3 – → 3N 2 + 2Br – +…
- Which of the following is correct representation of a given molecular equation in ionic form? K 2 Cr 2 O 7 + 7H 2 SO 4…
- Write the stoichiometric coefficient for the following reaction: x I 2 + y OH – → IO 3 – + z I – + 3H 2 O
- Which of the following can act as oxidising as well as reducing agent?
- Which compound amongst the following has the highest oxidation number of Mn?
- In which of the following reactions, the underlined substance has been reduced?
- Fill up the table from the given choice. Element Oxidation number Oxygen –2 in most compounds (i) in H 2 O 2 and (ii)…
- The number of moles of K 2 Cr 2 O 7 reduced by one mole of Sn 2+ ions is
- What is the oxidation number of carbon in C 3 O 2 (carbon suboxide)?
- When a manganous salt is fused with a mixture of KNO 3 and solid NaOH the oxidation number of Mn changes from +2 to
- The oxidation state of molybdenum in its oxo complex species [Mo 2 O 4 (C 2 H 4 ) 2 (H 2 O 2 )] 2– is
- Which of the following is a decreasing order of oxidation states of the central atoms?
- Which of the following is true about the given redox reaction? SnCl 2 + 2FeCl 3 → SnCl 4 + 2FeCl 2
- In the reaction : I 2 + 2S 2 O 3 2– → 2I – + S 4 O 6 2–
- In an oxidation process for a cell, M 1 → m 1 n + + ne – , the other metal ( M 2 ) being univalent showing reduction…
- A redox reaction is shown in the diagrams. Identify the reaction.
- Match the compounds given in column I with oxidation states given in column II and mark the appropriate choice. Column…
- Which is not true about the oxidation state of the following elements?
- Permanganate(VII) ion, MnO 4 – oxidises I – ion to I 2 and gives manganese(IV) oxide MnO 2 in basic medium. The…
- In the reaction : 3Br 2 + 6CO 3 2– + 3H 2 O → 5Br – + BrO 3 – + 6HCO 3 –
- A metal X displaces nickel from nickel sulphate solution but does not displace manganese from manganese sulphate…
- Write the following ions in order of decreasing capacity to accept electrons. H + , Mg 2+ , K + , Ag + , Zn 2+
- Oxidation number of iodine in IO 3 – , IO 4 – , KI and I 2 respectively is
- The E ° values of redox complex of halogens are given. Based on these values mark the correct statement. E ° I 2 / I –…
- In the conversion of Br 2 to BrO 3 – , the oxidation state of Br changes from
- Which of the following reactions takes place at anode?
- Oxidation number of sulphur in peroxomonosulphuric acid (H 2 SO 5 ) is
- Arrange the following metals in increasing order of their reducing power. [Given : E ° K + /K = –2.93 V, E ° Ag + /Ag =…
- The oxidation state of Fe in K 4 [Fe(CN) 6 ] is
- Which species is acting as a reducing agent in the following reaction? 14H + + Cr 2 O 7 2– + 3Ni → 2Cr 3+ + 7H 2 O +…
- The number of moles of KMnO 4 reduced by one mole of KI in alkaline medium is
- Oxidation number of Mn in its compounds MnCl 2 , Mn(OH) 3 , MnO 2 and KMnO 4 respectively is
- In the reaction : Cl 2 + OH – → Cl – + ClO 4 – + H 2 O
- The standard E ° values of few redox couples are Zn 2+ / Zn = –0.76 V, Ag + / Ag = + 0.80 V, Cu 2+ /Cu = 0.34 V. Choose…
- The oxidation number of nitrogen in (N 2 H 5 ) + is
- Which of the following statements is correct regarding redox reactions?
- Mn 3+ ions are unstable in solution and undergo disproportionation to give Mn 2+ , MnO 2 and H + ions. What will be the…
- The stoichiometric constants for the reaction p Cu + q HNO 3 → r Cu(NO 3 ) 2 + s NO + t H 2 O p , q , r , s and t…
- Which of the following species has an atom with +6 oxidation state?
- Identify the correct statement with respect to the following reaction, 2K 2 MnO 4 + Cl 2 → 2KCl + 2KMnO 4
- For decolourisation of 1 mole of acidified KMnO 4 the moles of H 2 O 2 required are
- Arrange the following in increasing order of oxidation state of Ni. K 2 [Ni(CN) 4 ], K 2 [NiF 6 ], Ni(CO) 4
- What is the correct representation of reaction occurring when HCl is heated with MnO 2 ?
- Oxidation number of carbon in CH 2 Cl 2 is
- Which of the following colour changes shown during redox titrations is not correct?
- Which of the following reactions will not take place at cathode?
- The values of coefficients to balance the following reaction are Cr(OH) 3 + ClO – + OH – → CrO 4 2– + Cl – + H 2 O