Question

An element which can exist as a positive ion in acidic solution and also as a negative ion in basic solution is said to be:

• A. colloidal
• B. hypertonic
• C. hypotonic
• D. amphoteric

Answer 1

The correct option is D amphoteric

An element which can exist as a positive ion in acidic solution and also as a negative ion in basic solution called amphoteric. An amphoteric compound is a molecule or ion that can react as an acid as well as a base.contain both acidic and basic groups and will exist mostly as zwitterions in a certain range of $pH$.

A colloidal solution is a solution in which a microscopically small substance that is equally dispersed throughout another material. A hypertonic solution is a solution with a higher concentration of solute (dissolved substance) than some other, specified solution (and which therefore has a higher osmotic pressure than the other solution). The solution with the lower concentration is then termed hypotonic.