question_answer

Which of the following mixture will lead to the formation of negatively charged colloid?

A) \[50\text{ }ml\text{ }of\text{ }0.1\text{ }M\,AgN{{O}_{3}}+\text{ }50\text{ }ml\text{ }of\text{ }0.1\text{ }M\text{ }KI\]

B) \[50\text{ }ml\text{ }of\text{ }0.1\text{ }M\,AgN{{O}_{3}}+\text{ }50\text{ }ml\text{ }of\text{ }0.2\text{ }M\text{ }KI\]

C) \[50\text{ }ml\text{ }of\text{ }0.2\text{ }M\,AgN{{O}_{3}}+\text{ }50\text{ }ml\text{ }of\text{ }0.1\text{ }M\text{ }KI\]

D) \[50\text{ }ml\text{ }of\text{ }0.2\text{ }M\,AgN{{O}_{3}}+\text{ }50\text{ }ml\text{ }of\text{ }0.2\text{ }M\text{ }KI\]

Correct Answer: B

Solution :

[b] Colloid will be formed only when the iodide ion is present in excess.