JEE Main 2020 — Some Basic Concepts Of Chemistry Question with Solution
From: JEE Main 2020 (Online) 7th January Evening Slot
Question
The flocculation value of HCl for arsenic sulphide sol.
is 30 m mol L-1 If H2SO4 is used for the flocculatiopn of arsenic sulphide, the amount in grams, of H2SO4 in 250 ml required for the above purposed is ______.
(molecular mass of H2SO4 = 98 g/mol)
is 30 m mol L-1 If H2SO4 is used for the flocculatiopn of arsenic sulphide, the amount in grams, of H2SO4 in 250 ml required for the above purposed is ______.
(molecular mass of H2SO4 = 98 g/mol)
Enter your answer
Show full solutionCorrect answer: 0.3675
Correct answer
0.3675
Step-by-step explanation
Arsenic sulphide sol is negatively charged, so for flocculation
positive ion required. Here positive ion H+ present.
for 1 L, 30 mm moles of H+ is required
for 250 ml, mm moles H+ is required
for 250 ml, mm moles H2SO4 is required.
Weight of H2SO4 required =
= 0.3675 g
for 1 L, 30 mm moles of H+ is required
for 250 ml, mm moles H+ is required
for 250 ml, mm moles H2SO4 is required.
Weight of H2SO4 required =
= 0.3675 g
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