Questions

Starch aqueous solution is a lyophilic colloidal solution.

Lyophilic colloids are liquid loving colloids.  When these colloids are mixed with suitable liquid high force of attraction exists between colloidal particles and liquid.

Rainforests are very dense, warm and wet forests. The reason it is called a "rain" forest is because of the high amount of rainfall it gets per year.

Error is in third part. Every, each, either, neither are adjectives that are always followed by a singular pronoun. Every being singular takes singular subject. Therefore ‘their ideas’ should be replaced with’ his/her idea’.

Capital deepening is a situation where the capital per worker is increasing in the economy. This is also referred to as increase in the capital intensity. Capital deepening is often measured by the rate of change in capital stock per labour hour.