Determine which choice(s) is/are correct? i. stirring slows down (decreases) rate of dissolution. ii. grinding solids increases their surface area of contact. iii. heating slows down (decreases) rate of dissolution. iv. grinding solids speed up their rate of dissolution. a) i, ii, and iii b) ii and iv c) i and iii d) iii and iv

Answer B- II and IV.

Grinding the solids increases their surface area of contact with the solvent. Hence this results in increased rate of dissolution. Also by grinding the large particles into smaller pieces,the resistive power is reduced and this results in increased rate of dissolution.

Example normal sugar dissolves faster in a solvent than a sugar cube due to reduced contact surface  area with the solvent.

explanation:

a fuel engine ( known as a gasoline engine in american english )is an internal combustion engine with spark ignition, designed to run on petrol (gasoline) and similar volatile fuels.

luster is not a good characteristic to use by itself because luster is the property of minerals that indicates how much the surface of a mineral reflects light. the luster of a mineral is affected by the brilliance of the light used to observe the mineral surface.