For decolourization of 1 mole of KMnO4, the moles of H2O2 required is
1.1 g of a sample of copper ore is dissolved and Cu2+ (aq) is treated with KI. The iodine thus liberated required 12.12 cm3 of 0.1 M Na2S2O3solution for titration. What is the percentage of copper in the ore?
Oxidation number of sodium in sodium amalgam is
In the given reaction,
X, Y, Z are
Which will be the proper alternative in place of A in the following equation.
Number of moles of K2Cr2O7 reduced by 1 mole of Sn2+ is
The values of x and y in the following redox reaction,
In the standardization of Na2S2O3 using K2Cr2O7 by iodometry, the equivalent weight of K2Cr2O7 is
When KMnO4 acts as an oxidising agent and ultimately forms , then the number of electrons transferred in each case respectively is
Excess of KI reacts with CuSO4 solution and Na2S2O3 solution is added to it. Which of the statements is incorrect foe the reaction?
The above equation balances when