Chemistry - Redox Reactions Question with Solution | TestHub
ChemistryRedox ReactionsProblem involving Equivalent ConceptMedium2 minQB
ChemistryMediumsingle choice
Passage / Comprehension
It was found that 100 g of silver combined with all the chlorine in 56 g of arsenious chloride. The vapour density of arsenious chloride is 6.25 (air = 1). The specific heat of arsenic is 0.08. Given that one litre of air at 0°C and 1 atm weighs 1.3 g. (Ag = 108)
What is the exact atomic weight of arsenic?
Options:
Answer:
A
Solution:
Equivalents of Cl = 100/108 = 0.9259, so mass of Cl = 0.9259 × 35.5 = 32.87 g and mass of As = 56 - 32.87 = 23.13 g, giving E(As) = 23.13/0.9259 = 24.98. By Dulong-Petit, approximate atomic weight = 6.4/0.08 = 80, so valency = 80/24.98 ≈ 3. Exact atomic weight = 24.98 × 3 = 74.94, matching (a).
Stream:JEESubject:ChemistryTopic:Redox ReactionsSubtopic:Problem involving Equivalent Concept
⏱ 2mℹ️ Source: QB
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