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Accelerate JEE 2020: Mole Concept and Stoichiometry-4 (24.07.2019)

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Question 1

The number of moles of

needed to oxidise 0.136 equivalents of N₂H₅⁺ by the reaction: N₂H₅⁺ +

→ N₂ + Cr³⁺ + H₂O is

Question 2

If molecular weight of As₂S₃ is M. Then in the following reaction
As₂S₃ + 7NaClO₃ + 12NaOH → 2Na₃AsO₄ + 7NaClO + 3Na₂SO₄ + 6H₂O.
the equivalent weight of As₂S₃ is

Question 3

Zinc tarnishes in moist air due to formation of ZnCO₃. 3Zn(OH)₂,

4Zn + 3H₂O + CO₂ + 2O₂→ ZnCO₃. 3Zn(OH)₂

The equivalent weight of Zn in above transformation is (At. mass of Zn is M)

Question 4

50 ml of 0.01 M Cu₂S require 20 ml of 0.05 M KMnO₄ for complete oxidation to CuSO₄, then

Question 5

20 ml of a H₃PO₄ solution needs 40 ml of 0.1 M NaOH to convert it into sodium dihydrogen phosphate. How much volume of 0.1 M Ca(OH)₂ is needed to neutralise the same volume of same H₃PO₄ completely

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Dec 23JEE & BITSAT