Complete the following statements by choosing the correct type of reaction for X and Y. 

Statement 1: The heating of lead nitrate is an example of 'X" reaction. 

Statement 2: The burning of magnesium is an example of 'Y reaction. 

The following observation help(s) us to determine that a chemical change has taken place: 

Which of the following reactions represents a double displacement reaction? 

Complete the following statements by choosing correct options for X and Y. "During the process of respiration, glucose combines with oxygen in the cells of our body and "X" a large amount of energy. Hence, respiration is an 'Y' process." 

Complete the following statement by substituting X and Y with correct options: "Corrosion and rancidity are the results of 'X' reaction of iron articles and oils/fats respectively. Galvanisation is done to prevent corrosion of iron articles and 'Y" are used to prevent rancidity of oils or fats". 

The reaction:

 $$\begin{gathered} {\mathrm{Fe}}_2{\mathrm{O}}_3\left(\mathrm{s}\right) + 2\mathrm{Al}\left(\mathrm{s}\right) \to {\mathrm{Al}}_2{\mathrm{O}}_3\left(\mathrm{s}\right) + 2\mathrm{Fe}\left(\mathrm{s}\right) \\ \mathrm{Ferric} \mathrm{oxide} \mathrm{Aluminium} \mathrm{Aluminium} \mathrm{oxide} \mathrm{Iron} \end{gathered}$$

is an example of a 

In the reaction, ${\mathrm{Be}}_2\mathrm{C}+{\mathrm{xH}}_2\mathrm{O}\to \mathrm{yBe}{\left(\mathrm{OH}\right)}_2+{\mathrm{CH}}_4$

The value of x and y are 

Which of the following statements is not true?

Which of the following is not a chemical change?