19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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 -> -> -> ->
Which of the following is not a redox reaction? (a) CaCO CaO CO -> (b) O 2H 2H O -> (c) Na H O NaOH H -> (d) MnCl MnCl Cl -> REDOX REACTIONS Ans (a) Sol. a. Oxidation states of Ca and C are +2 and +4, respec…
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…
In the equation NO H O NO 2H ne -> n stands for
In the ionic equation, BiO 6H xe Bi 3H O -> the value of x is
The ratio of stoichiometric coefficient of Fe2+ and MnO
What is the stoichiometric coefficient of Ca in the reaction? Ca Al Ca Al ->
For the redox reaction MnO4– + C2O42– + H+ ->Mn2+ + CO2 + H2O, The correct stoichiometric coefficients of MnO4– , C2O42– and H+ are respectively:
In the chemical reaction, K2Cr2O7 + XH2SO4 + YSO2 -> K2SO4 + Cr2(SO4)3 + ZH2O, X, Y and Z are
aK Cr O bKCl cH SO -> xCrO Cl yKHSO zH O The above equation balances when
In the balanced chemical reaction IO aI bH cH O dI -> a, b, c and d respectively, correspond to
In the following redox equation, 2+ 2- + 2+ 3+ 2 7 xUO +Cr O +yH aUO +zCr +bH O -> the value of coefficients x, y and z respectively, are
In acidic medium, H2O2 changes Cr O to CrO5 which has two (–– O –– O –––) bonds. Oxidation state of Cr in CrO5 is (AIMPT 2014)
Which of the following reactions are disproportionation reactions? (i) 2Cu Cu Cu -> (ii) 3MnO 4H 2MnO MnO 2H O -> (iii) 2KMnO K MnO MnO O -> (iv) 2MnO 3Mn 2H O 5MnO 4H -> Select the correct option fr…
In the neutral or faintly alkaline medium, KMnO4 oxidises iodide into iodate. The change in oxidation state of manganese in this reaction is from (NEET 2022)
aK Cr O bKCl cH SO -> xCrO Cl yKHSO zH O The above equation balances when
n-factor of Ba(MnO4)2 in acidic medium is
For the reaction, H PO NaOH NaH PO H O -> What is the equivalent weight of H3PO2? (mol. wt. is M)
MnO4 - is a good oxidizing agent in different medium changing to MnO Mn MnO MnO Mn O -> -> -> -> Changes in oxidation number respectively, are
A mole of N2H4 loses 10 mol of electrons to form a new compound Y. Assuming that all the nitrogen appears in the new compound, what is the oxidation state of nitrogen in Y? (There is no change in the oxidation number …
In which of the following pairs is there the greatest difference is the oxidation numbers of the oxidation numbers of the central atom?
In which of the following cases is the oxidation state of N atom wrongly calculated?
In which of the following pairs is there the greatest difference in the oxidation numbers of the underlined elements?
In which of the following is the highest oxidation state not possible?