Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEET2006ChemistrySurface ChemistryActual

Assertion : Fe ³⁺ can be used for coagulation of As ₂ ~S ₃ sol. Reason : Fe ³⁺ reacts with As ₂ ~S ₃ to give Fe ₂ ~S ₃ .

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of the assertion
  2. BIf both assertion and reason are true but reason is not the correct explanation of the assertion
  3. CIf assertion is true, but reason is false
  4. DBoth assertion and reason are false statements.

Correct answer

C. If assertion is true, but reason is false

Step-by-step solution

When oppositely charged sols are mixed in almost equal proportions, their charges are neutralised. Both sols may be partially or completely precipitated. When negatively charged As ₂ ~S ₃ sol is added to positively charged Fe ( OH )₃ sol, in suitable amounts, precipitation of both the sols take place simultaneously.

Practice Surface Chemistry on Quantrex Academy →

More from Surface Chemistry

Which of the following is a positively charged sol? 2023Pumice stone is an example of 2023Which one is an example of heterogenous catalysis? 2023Shown below are adsorption isotherms for a gas ' X ' at temperatures T ₁, ~T ₂ and T ₃ : p and x m represent pressure and extent of adsorption, respectively. The correct order of t 2022Given below are two statements : Statement I : In the coagulation of a negative sol, the flocculating power of the three given ions is in the order - Al 3 + > Ba 2 + > Na + 2022The right option for the statement "Tyndall effect is exhibited by", is: 2021Measuring Zeta potential is useful in determining which property of colloidal solution? 2020In which of the sols, the colloidal particles are with negative charge? 2020 Full Surface Chemistry list All NEET PYQs