Spontaneous reactions a. area always exothermic b. always take place at a rapid rate c. always result in increased disorder of the system d. always release free energy

Option (C) is the correct answer.

Explanation:

Spontaneity is defined as the degree of randomness. This means that more randomly the particles of a matter or substance are moving more it will has the spontaneity.

For example, particles of a gas are more spontaneous than particles of a liquid.

Thus, we can conclude that spontaneous reactions always result in increased disorder of the system.

answer: e.   sour taste

explanation: acids are those substances which dissociates in water to give ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. acids are sour in taste. example: hcl

bases are those substances which dissociates in water to give ions or accepts ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. bases are bitter in taste. bases are slippery in nature.

it is the most commonly accepted one