Questions

Permanent hardness of water may be removed by the addition of Sodium Carbonate.

Wind is the flow of gases on a large scale. On the surface of the Earth, wind consists of the bulk movement of air. The force that generates wind is called as Pressure gradient force.

All of the factors that contribute to global winds are 

1) Uneven warming of the earth by the sun
2) Coriolis Effect
3) Convection Cells

The main difference lies in the motive of the two parties. The main motive of the hedger is to hedge(minimize) the risk from the occurence of some events. 

The motive of the speculator is to gamble in the market in order to make the profit by buying/selling the derivative products.

A .MOV file is a common multimedia container file format developed by Apple. It may contain multiple tracks that store different types of media data and is often used for saving movies and other video files.

It is statement of balances of all the accounts in the ledger prepared to prove the arithmetical accuracy of the books of accounts.

A trial Balance is a list of Debit and Credit or a list of Debit & Credit Balance of all the ledger accounts prepared on any particular date