Question

Q9. How do carbohydeates, Protiens and fats get digested in human beings?
Q10. What is rust?
Q11. What is redox reaction? Give example.
Q12. Aluminium is a reactive metal but is still used for packing food articles
Q13. Identify the type of reaction from the following equations:-
a) CuSO4 + Zn + ZnSO2; +Cu
b) Cao +H2O + Ca(OH)2
Q14. A few drops of sulphuric acid are added to water before electrolysis.
Q15. What are the antacids? Name two compound Which are used as anta
016. A white powder is added while baking breads and cakes to make the
fluffy. What is the name of the powder? What are the main ingredients in
the functions of each ingredient?
Q17. What is a spherical mirror? What are its types?
Q18. Define refractive index of a transparent medium. What is its unit?
higher refractive index, water or glass?
Q19. State Snell's law of refraction.
Q20 A concave lens has focal length of 20 cm. At what distance from th
Tall object be placed so that it forms an image at 15 cm from the lens?
che size of the image formed.
ndar
7730 M COUE O​

Answer 1

Answer:

ans.9 carbohydrates are digested in the form of glucose ,protein into amino acids and fats into fatty acids

ans. 10 rust is a reddish or yellowish flaking coating of iron oxide that is formed on iron or steel by oxidation

ans.11 redox is a type of reaction in which the oxidation states of atoms are changed .

ans 12 aluminium is used for packing food articles because the upper surface gets converted into aluminium oxide which gets deposited as a thin coating on the surface of the metal