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General Principles and processes of Isolation of Elements
hard
Which of the following salt solutions would coagulate the colloid soloution formed when $FeCl _3$ is added to $NaOH$ solution, at the fastest rate?
A
$10\,mL$ of $0.2\,mol\,dm ^{-3} AlCl _3$
B
$10\,mL$ of $0.1\,mol\,dm ^{-3} Na _2 SO _4$
C
$10\,mL$ of $0.1\,mol\,dm ^{-3} Ca _3\left( PO _4\right)_2$
D
$10\,mL$ of $0.15\,mol\,dm ^{-3} CaCl _2$
(JEE MAIN-2023)
Solution
Sol. Formed is negatively charged solution, therefore $Al ^{3+}$ has highest coagulating power
Standard 12
Chemistry
