A measured temperature on Fahrenheit scale is 200^o F. What will this reading be on Celsius scale?

45.4 L of dinitrogen reacted with 22.7 L of dioxygen and 45.4 L nitrous oxide was formed. The reaction is given below  
2  N₂(g) + O₂(g)  \(\longrightarrow \) 2 N₂O (g)
Which law is being obeyed in this experiment? Write the statement of the law.

If 4g of NaOH dissolves in 36g of H₂O, calculate the mole fraction of each component in the solution. Also, determine the molarity of solution (specific gravity of solution is 1 g mL^-1).

If two elements can combine to form more than one compound, the masses of one element that combine with a fixed mass of the other element, are in whole number ratio.
(i)  Is this statements true ?
(ii)  If yes, according to which law ?
(iii) Give one example related to this law.

A box contains some identical red coloured balls, labelled as A, each weighing 2 g. Another box contains identical blue coloured balls, labelled as B₁ each weighing 5 g. Consider the combinations AB, AB₂, A₂ B and A₂B₃ and shows that law of multiple proportion is applicable.