In this equilibrium, hydroxide ion acts as a a) lewis base b) bronsted base c) both a & b d) neither a or b

(b) Bronsted base

Explanation:

The hydroxide ion is formed when losses ion

We know hat the compound which losses is known as the bronsted acid and the ion which is formed after losing is known as bronsted base

As the hydroxide ion is formed after losing the hydrogen ion from so it is a bronsted base.  

air

in a tire you fill a tire with air

then a couple days later you check the air pressure in the tire

hope this mark me brainliest

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.