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Question 1

the pure iron has ……….

Answer 1

no industrial important

Question 2

give reason the pure iron has no industrial important

Answer 2

1. because 1 - it is relatively soft . with low hardness
2. malleable . ductile طيع . قابل للسحب -
3. has magnetic properties
4. melts at 1538 , it is density is 7.87 gm / cm3

Question 3

its physical properties depend up on ………..and ,,,,,,,,,,,,,,,,,,,,

Answer 3

1. it is purity
2. the nature of its impurities

Question 4

a large number of seels and oher iron allos ma be produced wih specific propeties suitable for man uses

Question 5

iron differs from the elements before it in the first transtion series GR

Answer 5

because it has not the maximum the oxidation state correponding o removal of all elecrons ( 8 electron ) from 4s and 3d electrons

Question 6

in iron all oxidation state above ,,,,, are not important

Answer 6

+3

Question 7

when iron give +2 ion

Answer 7

when iron lose all elecron in s sup level

Question 8

when iron las suplevel be half filed

Answer 8

when it lose 2 elecron from s sup level and 1 elecron from d suplevel

Question 9

effect of air on red hot iron

Answer 9

3Fe_(s) + 2O_2(g) →H→ Fe₃O_4(s)

Question 10

effect of water on red hot iron

Answer 10

3Fe_(s) +4H₂O_(v) →H-500 C→Fe₂O_4(s) + 4H(g)

Question 11

effect of non metals ( chlorine ) and (sulphur) on red hot iron

Answer 11

2Fe_(s) + 3Cl_2(g)→H→ 2FeCl_3(s)

Fe_(s) + S_(s) → H → FeS_(s)

Question 12

give reason when red hot iron reacats with chlorine give iron III chloride not iron II chloride

Answer 12

bec chlorine is oxidizing agent

2Fe_(s) + 3Cl_2(g)→H→ 2FeCl_3(s)

Question 13

give reason when red hot iron reacats with sulphur give iron II sulphide not iron III sulphide

Answer 13

bec sulphur is reducing agent

Fe(s) + S(s) → H → FeS(s)

Question 14

effect of iron with mineral acid till me two of them

Answer 14

1. Fe_(s) +H₂SO_4(aq)→dil→FeSO_4(aq) +H_2(g)
2. Fe_(S) + 2HCl_(aq)→dil→ FeSO_4(aq) + H_2(g)

Question 15

effect of asids with conc sulphuric acid ( reducing agent )

Answer 15

2Fe_(s) + 8H₂SO_4(l) →H/conc→

→ FeSO_4(aq) + Fe₂(SO₄)_3(aq) + 4SO_3(g) +8H₂O_(v)

Question 16

effect of nitric acid acid till me about them sympol and words

Answer 16

passivity occurs due to the formation of thin layer of iron III oxide which protects the metal from further recatioin which can be removed by scraping or by diluted hydrochloric acid

Question 17

dilute acids react with iron give iron II salts not iron III salts

GR

Answer 17

bec H gas is reducing agent ,

Fe_(s) + 2HCl_(aq) →H→ FeCl_2(aq) +H_2(g)

Question 18

give reason iron doesnt affect by conc , nitric acid

Answer 18

passivity occurs due to the formation of thin layer of iron III oxide which protects the metal from further recatioin which can be removed by scraping or by diluted hydrochloric acid

Question 19

iron oxidized to ……..

write eqution

Answer 19

1. magneic iron oxide
2. 3Fe_(s) + 2O_2(g) →H→ Fe₃O_4(S)

Question 20

sm3 reducing agent

Answer 20

1. hydogen
2. carbon mono oxide

Question 21

any one of iron oxides reduced by hdrogen or carbon mono oxide at ……………C to iron magnetic oxide

Answer 21

230^oC to 300^oC

Question 22

any one of iron oxides reduced by hdrogen or carbon mono oxide at ……………C to iron II oxide

Answer 22

400^oC to 700^oC

Question 23

any one of iron oxides reduced by hdrogen or carbon mono oxide at ……………C to iron

Answer 23

700^oC

Question 24

any one of iron oxides oxidized by oxygen at to ……………

Answer 24

iron III oxide

Question 25

tell me all ways to preapre iron II oxide

Answer 25

1. Fe₂O_3(s) +H_2(g) →400 - 700→2FeO_(s) + H₂O_(v)
2. Fe₃O_4(s) + H_2(g) →400 - 700→ 3FeO_(s) +H₂O_(v)
3. ^COOFe_(s) →H abs of air→ FeO_(s) +CO_(g) + CO_2(g)
4. FeCO_3(s) →H→ FeO_(s) + CO_2(g)

Question 26

what is the properies of FeO

Answer 26

1. Black powder
2. insoluvle in water