Hi can you please help me to solve above questions​

21. displacement reaction

22. melting is an endothermic reaction

23. catalyst used in the preparation of methane from sodium ethanoate is

calcium oxide

24. size of the container do not affect the chemical reaction

25. group of organic compounds which differ by one CH2 GROUP IS CALLED

IS homologous series

Explanation:

i hope this will help you :)

9.02 * 10^23 atoms is contained in the molar mass of the element so we check with the periodic table.

the metal whose molar mass is 55.85 is iron (answer).