6 Red Carbage contain a chanical called anthrocyanin that changer color depending on the acrolity of ti environment
In an acidic environment it is reclish - pink, in a neutral
enverionment it is purple and in basic Calkaline) environment
It turns bluish - green and even yellow. Explain the phenomenon .​

nacl is added to the aqueous of what? ? in order to get a proper answer you have to specify the exact composition of the aqueous solution.

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.