Chemical Properties of Water

Which of the following will determine whether the given colourless liquid is water or not?

What is the product formed when a compound of the third element of group$-2$ and second element of group$-15$ is reacted with water?

What is the product formed when a compound of the third element of group$-2$ and second element of group$-15$ is reacted with water?

Why density of water is maximum at $4 °\mathrm{C}$?

Write balanced equation of water with a metal oxide and a non-metal oxide. 

What happens when methane react with water in presence of nickel as a catalyst? Write down the balanced chemical equation.

Complete the following equation: 
${\mathrm{CH}}_4 + \mathrm{\_\_\_\_\_} \to \mathrm{CO} + \mathrm{\_\_\_\_\_}$

Amongst the following, the form of water with the lowest ionic conductance at 298 K is

Ratio in hydrogen and oxygen in water molecule by volume is

The unique property of water molecules is: