19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
In the chemical reaction, K2Cr2O7 + XH2SO4 + YSO2 -> K2SO4 + Cr2(SO4)3 + ZH2O, X, Y and Z are
For the redox reaction MnO4– + C2O42– + H+ ->Mn2+ + CO2 + H2O, The correct stoichiometric coefficients of MnO4– , C2O42– and H+ are respectively:
Which of the following reaction is balanced? (a) AsO MnO AsO MnO 2H O -> (b) MnO C O Mn CO -> (c) 3 2 Cu 4HNO Cu(NO ) 2NO 2H O -> (d) H S HNO H O NO S -> Ans (c) Sol. In option (a), 2- - 3- AsO +MnO A…
What is the stoichiometric coefficient of Ca in the reaction? Ca Al Ca Al ->
The ratio of stoichiometric coefficient of Fe2+ and MnO
In the ionic equation, BiO 6H xe Bi 3H O -> the value of x is
In the equation NO H O NO 2H ne -> n stands for
Which of the following is not an intermolecular redox reaction? (a) MgCO MgO CO -> (b) O 2H 2H O -> (c) K H O KOH H -> (d) MnBr MnBr Br -> Ans (a) Sol. Intermolecular redox reaction and redox reactions …
Which of the following reaction is disproportionation? (a) 2H S SO 2H O 3S -> (b) Ca H CaH -> (c) P 3NaOH 3H O PH 3NaH PO ->
Assertion: F2 undergoes disproportionation reaction. Reason: Fluorine shows both positive and negative oxidation states.
Match the reactions in column I with their respective characteristics given in column II Column – 1 Column – 2 Name and Reaction Characteristics a. P PH H PO -> p. Fractional oxidation number b. C O q. c. CH Cl r. Na…
The reaction, 3ClO (aq) ClO (aq) 2Cl (aq) -> is an example of
Which of the following is a redox reaction? (a) NaCl KNO NaNO KCl -> (b) CaC O 2HCl CaCl H C O -> (c) Ca(OH) 2NH Cl CaCl 2NH 2H O -> (d) 2K[Ag(CN) ] Zn 2Ag K [Zn(CN) ] ->
In the reaction, SO 2H S 3S 2H O -> the substance oxidized is
An oxidation process involves
In the reaction o o ½ K O KO ->
Which of the following is the best description of the behaviour of bromine in the reaction given below? o H O Br HOBr H Br ->
The number of electrons lost in the following change is Fe H O Fe O H ->
Which of the following represents a redox reaction? (a) NaOH HCl NaCl H O -> (b) BaCl H SO BaSO 2HCl -> (c) CuSO 2H O Cu OH H SO -> (d) Zn 2HCl ZnCl H -> Ans (d) Sol.
In the reaction o 5 2 3Cl 6NaOH Na ClO 5Na Cl 3H O -> The element which loses as well as gains electrons is
In the reaction 3Br 6CO 3H O 5Br BrO 6HCO ->
Which of the following reactions do not involve oxidation-reduction? I.2Rb 2H O 2RbOH H II.2CuI 2CuI I III.NH Br KOH KBr NH H O IV.4KCN Fe CN K Fe CN -> -> -> ->
In the reaction 2FeCl H S 2FeCl 2HCl S ->
Which of the following is a disproportionation reaction? (a) Cu O 2H Cu Cu H O -> (b) 2CrO 2H Cr O H O -> (c) CaCO 2H Ca H O CO -> (d) Cr O 2O H 2CrO H O -> Ans (a) Sol. A chemical reaction in whic…
Assertion (A): H2O2 can acts as an oxidizing agent. Reason (R): All the peroxides behave as oxidizing agents only.