Question:
A few sols are given below:
As2S3 sol, starch sol, Al2O3 ·
xH2O sol, TiO2 sol, gold sol, congo red sol, blood, methylene blue sol, CdS sol
The number of positively charged sols in the above list is:
A few sols are given below:
As2S3 sol, starch sol, Al2O3 ·
xH2O sol, TiO2 sol, gold sol, congo red sol, blood, methylene blue sol, CdS sol
The number of positively charged sols in the above list is:
Show Hint
- Metal oxides and hydroxides generally form positively charged sols.
- Metal sulfides and dyes tend to form negatively charged sols.
- Understanding colloidal charge properties helps in applications like coagulation and electrophoresis.
Updated On: May 4, 2026
- \( 4 \)
- \( 5 \)
- \( 6 \)
- \( 7 \)
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
To determine the number of positively charged sols, we analyze the nature of each colloid.
Given sols:
- \( As_2S_3 \) sol
- Starch sol
- \( Al_2O_3 \cdot xH_2O \) sol
- \( TiO_2 \) sol
- Gold sol
- Congo red sol
- Blood
- Methylene blue sol
- \( CdS \) sol
- \( As_2S_3 \): Negatively charged sol
- Starch sol: Generally neutral
- \( Al_2O_3 \cdot xH_2O \): Positively charged sol
- \( TiO_2 \): Can form positively charged sol
- Gold sol: Generally negatively charged
- Congo red sol: Negatively charged
- Blood: Generally negatively charged (due to proteins)
- Methylene blue sol: Positively charged (cationic dye)
- \( CdS \): Negatively charged sol
Thus, positively charged sols are:
- \( Al_2O_3 \cdot xH_2O \)
- \( TiO_2 \)
- Methylene blue sol
Final Answer: 3
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