Step-by-step explanation:C
Combustion reaction defined as reaction of compound with the oxygen gas along with release of the large amount heat,.

When compound with nitrogen and metal atoms undergoes combustion reaction it gives nitrogen dioxide gas and solid metallic oxide of the metal as a products.
Compound X is nitrogen dioxide. 
Compound Y is metal oxide, 
True the shading is called an solution set
Answer:
33.5°
Step-by-step explanation:
All angles of a triangle on an euclidean plane add up to a sum of 180°. Therfore, subtract 113 (the known value) from 180 and divide by (for the missing angles).