Predict Whether Zinc And Silver React With 1 M Sulphuric Acid To Give Out Hydrogen Or Not. Give That The Standard Potentials Of Zinc And Silver Are – 0.76 Volt And +0.80 Volt Respectively.

A sample of mixture of AO and A₂O₃ in 2 : 1 molar ratio takes 0.015 mole of K₂Cr₂O₇ to oxidize the sample completely to from  in acidic solution. Millimoles of AO and A₂O₃ in the sample are respectively

0.01 mole of Fe₃O₄ is treated with excess of KI solution in presence of dilute H₂SO₄ whereby iron is reduced to Fe²⁺ along with liberation of iodine. What volume of 0.1 M Na₂S₂O₃ will be needed to reduce the librated iodine?

In which of the following reaction, oxidation number of N remains unchanged?

KMnO₄ acts as a strong oxidizing agent in acidic medium. The reaction that occurs is

What will be the effect on the electrode potential of a half-cell represented as  if the concentration of H⁺ ion is doubled in solution?

In which of the following oxidation state of phosphours is + 3?

Determine the volume of M/8 KmnO₄ solution required to react completely with 25.0 cm³ of M/4 FeSO₄ solution is acidic medium.

Calculate the concentration of hypo (Na₂S₂O₃.5H_­2O) solution in g dm^–3 if 10.0 of this solution decolourised 15 mL of M/40 iodine solution.

0.5 g of an impure sample of oxalate was dissolved in water and the solution made to 100 ml. On titration 10 ml of this solution required 15 ml of N/20 KMnO₄ solution. Calculate the percentage of pure oxalate in the sample.

Can a solution of 1 M copper sulphate be stored in a vessel made of nickel metal? Given that

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or Is it possible to store copper soulphate solution in a nickel vessel?

0.2 of sample H₂O₂ reduced 20 ml of 0.1 M KMnO₄ solution in acidic medium. What is the percentage purity of H₂O₂?