Which change of state involves a release of energy? boiling condensation melting sublimation

Answer

Condensation

Explanation

Condensation is the change of the physical state of matter from gas phase into liquid phase, and is the reverse of vaporization.  When gas condenses to liquid the quantity of energy converted from chemical to heat is called the Heat of Vaporization or ΔHvap. As the gas particles cool down the particles slow down, and a liquid forms. For example, the droplets of water seen on a mirror when you exhale come from water vapor (in your breather) that cools enough to condense and collect on the mirror.

While in case of other three process boiling, melting and sublimation heat is required. They are endothermic process.

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.