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This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Iron is obtained on a large scale from Fe_(2)O_(3) by |
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Answer» Reduction with Al |
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| 2. |
Iron is obtained ona large scale by reduction of Fe_(2)O_3 with : |
| Answer» Answer :A | |
| 3. |
Iron is mainly extracted by ___________. |
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Answer» self reduction method |
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| 4. |
IUPAC name of (##MBD_HKR_CHE_XII_P02_C12_E07_439_Q01.png" width="80%"> |
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Answer» Hexan-1-al-6-oic ACID |
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| 5. |
Iron is made inactive or passive by: |
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Answer» `H_3PO_4` |
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| 6. |
Iron is extracted from magnetite by reduction with : |
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Answer» C |
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| 7. |
IUPAC name of the following isO=CHCH_2CH_2CH_2CH_2COOH |
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Answer» Hexan-1-al-6-oic ACID |
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| 10. |
IUPAC name of malonic acid is |
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Answer» propanedioicacid |
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| 11. |
IUPAC name of m-cresol is_____. |
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Answer» 3-methylphenol |
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| 12. |
IUPAC name of malic acid is |
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Answer» 3-hydroxybutanoicacid |
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| 13. |
Iron (+II) is one of the most important oxidation states and salts are called ferrous salts. Most of the Fe(+II) salts are pale green and contain [Fe(H_(2)O)_(6_]^(2+) ion. Fe(+II) compounds are easily oxidised by air and so are difficult to obtain pure Fe^(2+) form many complexes like K_(4)[Fe(CN)_(6)]. Q.FeSO_(4) is used in brown ring test for nitrates and nitrites. In this test, a freshly prepared FeSO_(4) solution is mixed with solution containing NO_(2)^(-) or NO_(3)^(-) and the conc. H_(2)SO_(4) is run down the side of the test tube. It the mixture gets hot or is shaken. (I) the brown colour disappear(II)NO is evolved(III) a yellow solution in Fe_(2)(SO_(4))_(3) is formed |
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Answer» I, II, III |
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| 14. |
Iron (+II) is one of the most important oxidation states and salts are called ferrous salts. Most of the Fe(+II) salts are pale green and contain [Fe(H_(2)O)_(6_]^(2+) ion. Fe(+II) compounds are easily oxidised by air and so are difficult to obtain pure Fe^(2+) form many complexes like K_(4)[Fe(CN)_(6)]. Q. K_(3)[Fe(CN)_(6)] is used in the detection of Fe^(2+) ion with which it gives a deep blue colour. This colour is due to the formation of : |
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Answer» `K_(2)FE[Fe(CN)_(6)]` |
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| 15. |
IUPAC name of m-cresol is |
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Answer» 3-methylphenol |
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| 16. |
Iron (+II) is one of the most important oxidation states and salts are called ferrous salts. Most of the Fe(+II) salts are pale green and contain [Fe(H_(2)O)_(6_]^(2+) ion. Fe(+II) compounds are easily oxidised by air and so are difficult to obtain pure Fe^(2+) form many complexes like K_(4)[Fe(CN)_(6)]. Q. Anhydrous FeCl_(2) is made by : |
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Answer» HEATING Fe with DILUTE HCl |
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| 17. |
Iron (+II) is one of the most important oxidation states, and salts are called ferrous salts. Most of the Fe (+II) salts are pale green and contain [Fe(H_2O)_6]^(2+) ion. Fe (+II) compounds are easily oxidised by air. and so are difficult to obtain pure Fe^(2+) form many complexes like K_3[Fe(CN)_6] Anhydrous FeCl_2 is made by |
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Answer» heating Fe with dilute HCL By heating REACTIONS takes place in backward direction and `Fe^(+2)` oxidizes to `Fe^(+3)` |
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| 18. |
IUPAC name of m - cresol is ___________. |
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Answer» 3-methylphenol |
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| 19. |
Iron has lowest oxidation state in: |
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Answer» `FE(CO)_5` |
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| 20. |
Iron has density of 7.86 gcm^(-3)and an atomic mass of 55.85 u. The volume occupied by 1 mol of Fe is |
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Answer» `22.8 cm^3 "mol"^(-1)` ` = (55.85 g "mol"^(-1) )/(7.86 g cm^(-3) )= 7.11 cm^3 "mol"^(-1)` |
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| 21. |
IUPAC name of m-cresol is …. |
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Answer» 3-methylphenol 
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| 22. |
Iron has a body-centred cubic unit cell with the cell dimension of 286.65 pm. Density of iron is 7.87 g cm^(-3). Use this information to calculate Avogadro's number. Atomic mass of Fe = 56.0 u. |
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Answer» Solution :Given `a=286.65" PM "=286.65xx10^(-10)cm, d=7.87gcm^(-3), z=2" (for bcc)"` USE the relation `d=(zM)/(a^(3)N_(A)) or N_(A)=(zM)/(a^(3)d)` Substituting the VALUES in the above equation, we have `N_(A)=(2xx56)/((286.65xx10^(-10))^(3)xx7.87) or N_(A)=6.02xx10^(23)` |
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| 23. |
Iron has a body-centred cubic unit cell with a cell edge of 286.65 pm. The density of iron is 7.87 g cm^(-3). Use this information to calculate Avogadro's number. [At. mass of Fe = 56 g mol^(-1)] |
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Answer» Solution :APPLY the following relation : `N_(A)=(zxxM)/(dxxa^(3)` As it has a BCC structure z = 2. SUBSTITUTING the values in the above relation, we have `N_(A)=(2xx56)/((286.65)^(3)xx10^(-30)xx7.87)=6xx10^(23)`. |
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| 24. |
Iron has a body centred cubic unit cell with a cell dimension of 286.65 pm. The density of Iron is 7.874 g cm^(-3). Use this information to calculate Avogadro's number. (At mass of Fe = 55.845 u). |
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Answer» Solution :`d = (Z xx M)/(a^(3) xx d)` For bcc lattice Z = 2 `N_(A) = (2 xx 55.845 G mol^(-1))/((286.65 xx 10^(-10) cm)^(3) N_(A))` `N_(A) = (2 xx 55.845 g mol^(-1))/((286.65 xx 10^(-10) cm)^(3) xx 7.874 g cm^(-3))` `N_(A) = 6.04 xx 10^(23) mol^(-1)` |
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| 25. |
Iron forms iron halides salts by reacting the metal directly with halogen. FeI_(3) does not exist. FeF_(3) is white soled inspite of five unpaired electronswith d^(5) configuration . FeCl_(3) is soluble in water and is used as a mordant in dyeing industry. Q.Anhydrous FeCl_(3) can be prepared by reaction of: |
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Answer» Fe with dry chlorine |
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| 26. |
Iron forms iron halides salts by reacting the metal directly with halogen. FeI_(3) does not exist. FeF_(3) is white soled inspite of five unpaired electronswith d^(5) configuration . FeCl_(3) is soluble in water and is used as a mordant in dyeing industry. Q.FeCl_(3) solution added to K_(4)[Fe(CN)_(6)] gives A while with KSCN gives B. A and B respectively are: |
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Answer» `Fe_(3)[Fe(CN)_(6)]_(2), Fe(CNS)_(3)` |
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| 28. |
Iron forms iron halides salts by reacting the metal directly with halogen. FeI_(3) does not exist. FeF_(3) is white soled inspite of five unpaired electronswith d^(5) configuration . FeCl_(3) is soluble in water and is used as a mordant in dyeing industry. Q.FeI_(3) does not exist because: |
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Answer» of LARGE SIZE |
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| 29. |
IUPAC name of Li[AlH_4] is |
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Answer» LITHIUM aluminium hydride |
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| 30. |
Iron exhibits bcc structure at room temperature. Above 900^@C, it transforms to foc structure. The ratio of density of iron at room temperature to that at 900^@C (assuming molar mass and atomic radius of iron remains constant with temperature) is .......... |
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Answer» `(SQRT3)/(sqrt2)` For fcc lattice `: Z = 4, a = 2sqrt(2)r` `(d_(R.T))/(d_(900^@C)) = (((ZM)/(a^3N_A))_("bcc"))/((ZM)/(a^3N_A))_("fcc") = 2/4((2sqrt(2)r)/((4r)/(sqrt3))) = (3sqrt(3))/(4sqrt(2))` |
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| 31. |
Iron exhibits property of ferromagnetism__________. |
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Answer» above 1800K |
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| 33. |
Iron exhibits bcc structure at room temperature. Above 900^(@)C, it transforms to fee structure. The ratio of density of iron at room temperature to that at 900^(@)C (assuming molar mass and atomic radii of iron remains constant with temperature) is |
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Answer» `(3sqrt(2))/(4sqrt(2))` |
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| 34. |
Iron exhibits +2 and +3 oxidation states. Which of the following statements about iron is incorrect ? |
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Answer» Ferrous compounds are more EASILY HYDROLYSED than the corresponding ferric compounds |
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| 35. |
Iron exhibits (+2) and (+3) oxidation states. Which of the following statements about iron is incorrect? |
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Answer» Ferrous COMPOUNDS are relatively more ionic than the corresponding ferric compounds |
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| 36. |
IUPAC name of K_(4)[Fe(CN)_(6)] is- |
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Answer» tetrapotassium ferrocynaide |
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| 37. |
Iron does not rust even if the zinc coating is broken in a galvanised iron pipe but rusting occurs much faster if the tin coating over iron is broken. Explain. |
| Answer» SOLUTION :ZINC is more electropositive WHEREAS tin is less electropositive than iron. | |
| 38. |
Iron crystallizes in several modifications. At about 910^(@)C, the body centred cubic alpha - form undergoes a transition to the face centred cubic gamma- form. Assuming that the distance between nearest neighbours is same in the two forms at the transition temperature. Calculate the ratio of density of gamma - iron to that of alpha - iron at the transition temperature. |
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Answer» |
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| 39. |
IUPAC name of K_(3)[Fe(CN)_(6)] is (Ker CET) |
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Answer» potassiumhexacyanoferrate (II) |
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| 40. |
Iron, cobalt and nickel are collectively called as "…................" metals. |
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Answer» |
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| 41. |
IUPAC name of K_(3)[Fe(CN)_(6)] is |
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Answer» potassium HEXACYANOFERRATE (III) |
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| 42. |
Iron carbonyl, Fe(CO)_5 is |
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Answer» trinuclear |
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| 43. |
Iron carbonyl, Fe(CO)_(5) is - |
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Answer» Trinuclear |
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| 44. |
IUPAC name ofK_(3)[Fe(C_(2)O_(4))_(3)] is |
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Answer» POTASSIUM trioxalatoferrate (I) |
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| 45. |
Iron catalyst is used in |
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Answer» CONTACT process |
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| 46. |
Iron cannot form complexes with ammonia because |
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Answer» In alkaline solution, iron salts are precipitated as their hydroxides which are insoluble in excess of alkali |
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| 47. |
Iron can be prevented from rusting by |
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Answer» Connecting iron to more electropositive metal `-` a case of cathodic protection Anodic protection `:` A technique to control corrosion of a matal by making it work as anode developing a PASSIVE film on the metal. it used in extremely corrosive CONDITIONS and most extensively used to store and hangle sulphuric acid container. |
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| 48. |
IUPACname of K_(3)[Fe(C_(2)O_(4))_(3)] is |
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Answer» POTASSIUM trisoxalato FERRATE (III) |
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| 49. |
Ironarticlesusually rustwithinfew years.But since400 A.D theDelhiiron pillerNear Kutab Minaris existingwithout anyrustor signof decay. Explainhow ? |
| Answer» Solution :Iron rustsdue totheformation ofhydrated ferricoxide ` (Fe _ 2 O_3 .x H _ 2 O ) `which keepson peelingoff,exposingfresh surfaceto airand moisturefor rusting. ONTHE OTHERHAND,magnetite`(Fe_ 3O_ 4 ) `isanotheroxideof ironwhichstickstothe surfaceto metalofcenturies. THUS, Delhiiron pillar doesnot rustsincea thinfilmofmagnetite hasbeenappliedon itssurfacebyapplyingamixtureofdifferentsalts,heatingand quenching. | |