On hills, water boils quickly.

Name any two metals that react with cold water very quickly. Write the products formed when these metals react with cold water.

An electric kettle has two heating elements. When one element is connected to an a.c. source the water boils in 10 min. When the other element is used the water boils in 40 min. If both elements are connected in parallel, the time taken by same quantity of water to boil is

A radioactive sample is placed in boiling water. Will its activity increase ?

Sodium chloride solution freezes at lower temperature then water but boils at higher temperature than water. Explain.

A solution of glycerol (C_(3) H_(8) O_(3)) in water was prepared by dissolving some glycerol in 500 g of water. This solution has a boiling point of 100.42^(@) C while pure water boils at 100^(@) C. What mass of glycerol was dissolved to make the solution ? (K_(b) "for water " = 0.512 K "kg mol"^(-1))