Questions

No. Boiling water is not a chemical change. Because in this process it doesn't loss its properties. It just changes its state i.e, from liquid state to gaseous.

Hence, Boiling water is a Physiacl change and not a chemical change.

Mixed economy is the most common economic system in the world.

Water  is  neutral  and  has  a  pH value  of  7  and  because  here it  is multiple distilled water, it would be very near to seven

A snowman is a cold man without a soul, if there is warmth in it, it slowly will kill him.

Federalism ::

Federalism is a system based upon democratic rules and institutions in which the power to govern is shared between national and provincial/state governments, creating what is often called a federation.

Federalism is a political concept in which a group of members are bound together with a governing representative head. 

Federalism enables the state and the national government to share power.

District cooling system is a well known and energy efficient technology adopted across the world. India's 1st district cooling system will come up in the green city Amaravathi, the capital city of Andhra Pradesh state.

District cooling system (DCS) distributes thermal energy in the form of chilled water from a central source to multiple buildings through a network of underground pipes for use in space cooling. The cooling or heat rejection is usually provided from a central cooling plant, thus eliminating the need for separate systems in individual buildings.