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° Here is your Answer which you are searching for °
Ans:- 1 According to Electronic concept of redox reaction Oxidation is less of electrons and Reduction is Gain of electron
Ans:-2 1) 4 Na + O2 gives 2Na2O
In this reaction 4Na in reactent side and O in the product side is reduction or 4Na in L.H.S and 2Na in R.H.S is the oxidation.
2) CuO +H2O gives Cu+H2O
CuO in L.H.S or Cu in R.H.S is reduction and H2 in left hand side and H2O in right hand side is Oxidation.
3) MnO2+ 4HCL gives MnCl2+ 2H2O +Cl2
In this MnO in left hand side and MnCl2 in right hand side is reduction and 4HCL in left hand side and Cl2 is Oxidation
Ans:- 3 (A) Oxidizing agent is the substance which help in oxidation and itself get reduced
While Reducing agent is the substance which help in reduction and itself get oxide .
(B) (i) Zn + 2AgNO3 gives Zn(NO3)2 +2Ag
In this Zn(NO3)2 is Oxidizing agent while 2Ag is Reducing agent
(ii) Fe2O3 + 3CO gives 2Fe +3CO
In this Fe2O3 is Reducing agent
While 2Al is Oxidizing agent.
Ans:-4 The Chemical or electrochemical reaction between a material, usually a metal ,and it's environment that produces a deterioration of the material and it's properties is called corrosion.
Ans-:5 (a) Iron corrodes readily when exposed to moisture and get converted with a brown flaky substance called rust . It is called rusting of iron .
(B) 2Fe +3/2O2 +H2O gives Fe2O3 (Reddish brown) +H2O
Ans:-6 Silver
Reaction involved in this is Ag +H2S +O2 gives Ag2S (Silver sulphide Black colour ) +H2O
Ans:-7 Copper reacts with moist carbon dioxide in the air and slowly losses it's shiny brown surface and aquires a green coating of basic copper carbonate . Reaction involved in this is Cu + CO2 +O2 gives CuCO3 . Cu[OH ] 2
Ans:-8 It is caused due to prongoled exposure of food
in air . oxygen in food /oil present in food and form volatile substance, which have bad odour .
Ans:-9 Prevention of rancidity
(A) It can be retarded by keeping food in refrigerator .
(B) Rancidity can be prevented by packaging fat and oil containing foods in the presence of nitrogen gas .
(C) It can be retarded by storing Foods away from light
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Hope you satisfied with my answer
All the best for exam
Be Brainly
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Together we make a difference
Warm Regards
@Brainlestuser
brainly star,Ace
=°°========°°===========
° Here is your Answer which you are searching for °
Ans:- 1 According to Electronic concept of redox reaction Oxidation is less of electrons and Reduction is Gain of electron
Ans:-2 1) 4 Na + O2 gives 2Na2O
In this reaction 4Na in reactent side and O in the product side is reduction or 4Na in L.H.S and 2Na in R.H.S is the oxidation.
2) CuO +H2O gives Cu+H2O
CuO in L.H.S or Cu in R.H.S is reduction and H2 in left hand side and H2O in right hand side is Oxidation.
3) MnO2+ 4HCL gives MnCl2+ 2H2O +Cl2
In this MnO in left hand side and MnCl2 in right hand side is reduction and 4HCL in left hand side and Cl2 is Oxidation
Ans:- 3 (A) Oxidizing agent is the substance which help in oxidation and itself get reduced
While Reducing agent is the substance which help in reduction and itself get oxide .
(B) (i) Zn + 2AgNO3 gives Zn(NO3)2 +2Ag
In this Zn(NO3)2 is Oxidizing agent while 2Ag is Reducing agent
(ii) Fe2O3 + 3CO gives 2Fe +3CO
In this Fe2O3 is Reducing agent
While 2Al is Oxidizing agent.
Ans:-4 The Chemical or electrochemical reaction between a material, usually a metal ,and it's environment that produces a deterioration of the material and it's properties is called corrosion.
Ans-:5 (a) Iron corrodes readily when exposed to moisture and get converted with a brown flaky substance called rust . It is called rusting of iron .
(B) 2Fe +3/2O2 +H2O gives Fe2O3 (Reddish brown) +H2O
Ans:-6 Silver
Reaction involved in this is Ag +H2S +O2 gives Ag2S (Silver sulphide Black colour ) +H2O
Ans:-7 Copper reacts with moist carbon dioxide in the air and slowly losses it's shiny brown surface and aquires a green coating of basic copper carbonate . Reaction involved in this is Cu + CO2 +O2 gives CuCO3 . Cu[OH ] 2
Ans:-8 It is caused due to prongoled exposure of food
in air . oxygen in food /oil present in food and form volatile substance, which have bad odour .
Ans:-9 Prevention of rancidity
(A) It can be retarded by keeping food in refrigerator .
(B) Rancidity can be prevented by packaging fat and oil containing foods in the presence of nitrogen gas .
(C) It can be retarded by storing Foods away from light
=====°========°=========
Hope you satisfied with my answer
All the best for exam
Be Brainly
Be Proud
Together we make a difference
Warm Regards
@Brainlestuser
brainly star,Ace
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