In the standardization of Na2S2O3 using K2Cr2O7 by iodometry, the equivalent weight of K2Cr2O7 is
Since K2Cr2O7 accepts 6 electrons for its reduction to Cr3+ ions,
Eq. wt. = Mol. Wt/6.
16.6 g of pure potassium iodide was dissolved in water and the solution was made up to one litre. V cm3 of this solution was acidified with 20 cm3of 2 M HCl. The resulting solution required 10 cm3 of decinormal KIO3for complete oxidation of I– ions to ICl. Find out the value of V.
Both (aq) can be used to titrate Fe2+ (aq). If in a given titratoion, 24.50 cm3 of 0.1 M were used, then what volume of 0.1 M solution would have been used for the same titration?
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,
When KMnO4 acts as an oxidising agent and ultimately forms , then the number of electrons transferred in each case respectively is
For decolourization of 1 mole of KMnO4, the moles of H2O2 required is