26. hydrochloric acid. This is ___________ reaction.
27. When the iron nail dipped in copper sulphate solution becoming __________.
28. If two reactants exchange their constituents chemically and form two products, then
the reaction iscalled as ____________ reaction.
29. Na2SO4 + BaCl2 → ______ + 2 NaCl
30. ‘Oxidation’ is a reaction that involves the addition of _________ or removal of ________.
31. ‘Reduction’ is a reaction that involves the addition of __________ or removal of _________ .
32. Generally oxidation and reduction occur in the same reaction. If one reactant gets oxidized, the other gets reduced. Such reactions are called ____________ reactions or _______ reactions.
33. Apples pears, bananas, potatoes etc., contain enzyme called _____________ or ___________, which reacts with oxygen and changes the colour on the cut surface of the fruit.
34. The browning of iron, when left for sometime in moist air, is a process commonly known as __________ of iron.
35. Rusting of Iron is basically oxidation reaction which requires both _______ and __________.
36. Rusting does not occur in ________ free water or ________ .
37. Burning of crackers is also __________ process of variety of chemicals.
38. When some metals are exposed to moisture, acids etc., they tarnish due to the formation of respective metal oxide on their surface. This process is called __________.
39. ____________ is a method of protecting iron from rusting by coating them a thin layer of Zinc.
40. __________ is also a very good method of improving properties of metal.
41. Iron is mixed with carbon, nickel and chromium to get an alloy _________.
42. Examples of Alloys are _________ and steel.
43. Combustion is the most common example for ________ reactions.
44. The metal oxide is an electrical ___________ .
45. When fats and oils are oxidized they become _______. Their smell and taste change.
46. Rancidity is an ___________ reaction.
47. The spoilage of food can be prevented by adding preservatives like __________ and _________.
48. The manufacturers of potato chips flush bags of chips with ________ gas to prevent the chips from getting oxidized.
No comments