94420 + Interview Questions in Chemistry in Class 12

1.	IUPAC name of secondary butyl alcohol is
Answer» 2-methylpropan-1-ol butan-2-ol 2-methylpropan-2-ol butan-1-ol ANSWER :B

Discussion

2.	IUPAC name of serine is
Answer» 2-Aminoethanoic acid 2-Aminopripanoic acid 2-Amino-3-hydroxypropanoic acid 2-Amino-3-mercaptopropanoic Answer :C

Discussion

3.	Iron sheets are galvanized mainly to :
Answer» HARDEN the surface Increase lustre Prevent ACTION of water Prevent action of OXYGEN and water Answer :D

Discussion

4.	IUPAC name of [Pt(NH_(3))_(3) (Br) (NO_(2))Cl]Cl is
Answer» triamminebromochloronitroplatinum (IV) chloride <BR>triamminebromonitrochloroplatinum (IV) chloride triamminechlorobromonitroplatinum (IV) chloride triamminenitrochlorobromoplatinum (IV) chloride Solution :The IUPAC NAME of `[Pt(NH_(3))_(3)(Br)Cl` is triamminebromochloronitroplatinum chloride. (Oxidation number of Pt = + 4, and ligands are arranged in alphabetical ORDER)

Discussion

5.	IUPAC name of [Pt(NH_(3))_(2)Cl(NO_(2))] is:
Answer» PLATINUM disminechlorite Chloronitriti-N-ammine platinum(II) Diamminechloridonitritr-N-platinum(II) Diamminechlornitrite-N-platinate(II) ANSWER :C

Discussion

6.	IUPAC name of [Pt(NH_(3))_(2)Cl(NO_(2))] is
Answer» PLATINUM diaminechloronitrite Chloronitrito-N-ammineplatinum (II) Diamminechloridonitrito-N-platinum (II) Diamminechloronitrito-N platinate (II) ANSWER :C

Discussion

7.	Iron scraps are advisable and advantageous than zinc scraps for reducing thelow grade copper ores. Why?
Answer» SOLUTION :ZINC is COSTLIER METAL than IRON.

Discussion

8.	IUPAC name of [Pt(NH_(3))_(2)Cl(NO_(2))] is :
Answer» PLATINUM diaminechloronitrite Chloronitrito-N-ammineplatinum (II) Diamminechloridonitrito-N-platinum (II) Diamminechloronitrito-N-platinate (II) SOLUTION :N//A

Discussion

9.	Iron rod is immersed in NaCl solution such that half its length is exposed to air and the other half immersed in NaCl solution. Which part is corroded and why ?
Answer» ANSWER :

Discussion

10.	Iron rusts in the persence of :
Answer» O and `N_2` `O_2` and MOISTURE Moisture only `O_2` only Answer :B

Discussion

11.	Iron reacts with steam to form
Answer» `Fe_(2)O_(3)` `Fe_(3)O_(4)` `H_(2)` Both B & C Solution :`3Fe+4H_(2)O("Steam")RARR Fe_(3)O_(4)(s)+4H_(2)(G)` (b) and (c) are CORRECT. (a) and (d) are not correct.

Discussion

12.	Iron present in haemoglobin is an
Answer» FERROUS state ferric state PARTLY in ferrous and partly in ferric elemental state Answer :A

Discussion

13.	The IUPAC name of phenetole is ________.
Answer» Phenoxy benzene Ethoxy benzene Methoxy benzene Propoxy benzene Answer :B

Discussion

14.	Iron pipes lying under acidic soil are often attached to blocks of magnesium offers protection to iron against corrosion because it
Answer» Prevents AIR from reaching the surface of IRON Is more readily converted into POSITIVE ions Is HIGHER electropositive than iron Forms a corrosion-resistance alloy with iron SOLUTION :Due to electropositive and reactive in nature, magnesium is readily converted into positive ions on contact with iron pipes and hence, iron pipes remains as it is.

Discussion

15.	IUPAC name of pinacol is
Answer» 2,3-dimethylbutan - 2,3-diol 2,3 -DIMETHYLBUTANE -2,3-diol 2,3-dimethylbutan-2-ol 2,3-dimethylbutan -3-ol ANSWER :B

Discussion

16.	Iron ores are dressed by :
Answer» FROTH FLOATATION process Magnetic separation Hand picking All the above Answer :B

Discussion

17.	Iron pipe are usually coated with zinc.
Answer» SOLUTION :To PREVENT rusting/corrosion of IRON.

Discussion

18.	IUPAC name of phenatole is
Answer» methoxymethane. ethoxybenzene. ethoxyethane. methoxybenzene. Answer :B

Discussion

19.	ores dressing for iron by :
Answer» FROTH FLOATATION process Magnetic separation Hand picking All the above Answer :B

Discussion

20.	Iron, once dipped in concentrated H_(2)SO_(4), does not displace copper from copper sulphate solution, because
Answer» it is LESS reactive than COPPER a layer of sulphate is deposited on it a layer of oxide is deposited on it none of the above Answer :C

Discussion

21.	Write the IUPAC names of [Ni(CO)_(4)]co-ordination compounds.
Answer» tetracarbonyl NICKEL(II) tetracarbonyl Nickel (O) tetracarbonyl Nickelate (II) tetracarbonyl Nickelate (O) ANSWER :B

Discussion

22.	Iron ore is concentrated by
Answer» FROTHFLOATATION Electrolysis Roasting Magnetic treatement Answer :D

Discussion

23.	Iron, once dipped in concentratred H_2SO_4 , does not displace copper from copper sulphate solution , because :
Answer» It is less reactive than COPPER A layer of sulphte is DEPOSITED on it A layer of OXIDE is deposited on it None Answer :C

Discussion

24.	Iron occurs as body-centred as well as face centred cubic systems. If the effectiveness radius of an atom of iron is 124 pm, calculate the density of iron in both the structures.
Answer» ANSWER :`7.89 g//cm^3 (BC C), 8.59 g//cm^3 (FC c)`

Discussion

25.	IUPAC name of oxalic acid is :
Answer» Hexane-1 ,2-dioic ACID Ethane-1, 2-dioic acid ETHANOIC acid Butane-1, 2-dioic acid ANSWER :B

Discussion

26.	The iron obtained from the blast furnace is called as
Answer» Steel Cast iron Wrought iron Pig iron Answer :C

Discussion

27.	Iron metal is produced commercially by reducing iron (III) oxide in iron ore with carbon monoixde :
Answer» Write down the balanced chemical equation for the above reduction of iron (III) oxide? Enthalpies of FORMATION for various substance at `25^(@)C` are given in the following table. `{:(,FeO_(3(g)),CO_(g),Fe_(g),CO2_(g)),(DeltaH_(f)^(@)(KJ//"mol"),-824.2,-110.5,0,-393.5),(S[J//(K."mol")],87.5,197.6,27.3,213.6):}` Calculate the standard free-energy change for this reaction at `25^(@)`C ? Is the reaction spontaneous at `25^(@)`C ? Does the reverse reaction become spontaneous at higher TEMPERATURE? Explain. Solution :N//A

Discussion

28.	IUPAC name of the complex, Ni(CO)_4 is
Answer» TETRACARBONYLNICKEL (II) tetracarbonylNickel (O) tetracarbonylNickelate(II) tetracarbonylNickelate (O) ANSWER :B

Discussion

29.	Iron nails are dipped into blue copper sulphate solution. After sometime iron nails are
Answer» dissolved and blue colour is DISCHARGED dissolved but blue colour is not discharged not dissolved and blue colour is not discharged not dissolved but blue colour is discharged Solution :Iron is more REACTIVE than copper , thus DISPLACES copper from copper SULPHATE solutions. `Fe + underset("blue")(CuSO_(4)) to underset("green")(FeSO_(4)) + underset("red-brown")(Cu)` The copper formed get deposited over the iron nail and blue colour of the solution gradually disappears and REMOVED from the solution.

Discussion

30.	IUPAC name of neo-pentyl halide is
Answer» 2-halopropane 2-halo-2-methylpropane 1-halo-2-methylpropanes 2-halobutane Answer :B

Discussion

31.	Iron loses magnetic property at
Answer» Melting POINT 1000 K Curie point Boiling point Solution :Iron LOSES MAGNETIC PROPERTY at curie point.

Discussion

32.	IUPAC name of Na_3[Al(C_2O_4)_3] is
Answer» SODIUM trioxalatoaluminate (III) Sodium trisoxalatoaluminate (III) Sodium ALUMINIUM oxalate Sodium trioxalatonluminute (O) ANSWER :A

Discussion

33.	Iron is rendered passive when treated with conc. :
Answer» `H_(2)SO_(4)` HCl `H_(3)PO_(4)` `HNO_(3)` ANSWER :D

Discussion

34.	Iron is rendered passive by treatment with concentrated :
Answer» `HCl` `H_(2)SO_(4)` `CU` `Ag` Solution :`HNO_(3)` being strong oxiding agent oxidises IRON to its oxides `(Fe_(3)O_(4))` which forms a THIN protective layer over the metal. This makes the iron passive

Discussion

35.	Iron is rendered passive in concentrated :
Answer» `H_2SO_4` `H_3PO_4` HCL `HNO_3` ANSWER :D

Discussion

36.	Iron is rendered passive by treatment with:
Answer» `H_(2)SO_(4)`(dil) `H_(2)PO_(4)` CONC.`HNO_(3)` HCl Answer :C

Discussion

37.	IUPAC name of Na_3[CO(ONO)_6] is :
Answer» SODIUM cobaltinitrite Sodium hexanitritocobaltate (III) Sodium hexanitrocobMt (III) Sodium hexanitritocobaltate(ll) ANSWER :B

Discussion

38.	Iron is rendered passive by the action of
Answer» Conc. `H_(2)SO_(4)` Conc. `H_(3)PO_(4)` Conc. `HCl` Conc. `HNO_(3)` Solution :Iron is rendered passive by conc. `HNO_(3)` and other OXIDIZING agents like `K_(2)Cr_(2)O_7),KMnO_(4),` CHLORIC acid, CHROMIC acid, silver nitrate etc. A specimen of passive iron can be rendered active by scratching the film mechanically or chemically.

Discussion

39.	Iron is prepared from one of its ore hematite Fe_(2)O_(3) by reaction with carbon as follows: Fe_(2)O_(3)(s)+C(s)rarrFe(s)+CO_(2)(g)uparrow Above reaction occur in an open furnance. In above question number 8 how much carbon was consumed.
Answer» 9gm 0.4kg 9kg 40kg Solution :`n_(C) "consumed"=(3xxn_(FE))/(4)=(3)/(4)xx10^(3)` `w_(C) "consumed"=(3)/(4)xx12=9kg`

Discussion

40.	IUPAC name of Na_(3)[Co(NO_(2))_(6)] is
Answer» sodium hexanitritocobaltate(II) sodium hexanitritocobalt(III) sodium hexanitrocobaltate(III) sodium cobaltnitrite Solution :IUPAC name of `Na_(3)[Co(No_(2))_(6)]` sodium hexanitritocobaltate (III) OXIDATION STATE : `3(1) + x + 6(-1) = 0` or `x - 3 = 0 Rightarrow x = 3`.

Discussion

41.	Iron is rendered passive by
Answer» CONC. `HCl` Conc. `HNO_(3)` Conc. `H_(2)SO_(4)` Conc. `H_(3)PO_(4)` Answer :B

Discussion

42.	IUPAC name of methyl n-propyl ether is
Answer» propoxymethyl 2-methoxy propane 1-methoxypropane methylpropaonate Answer :C

Discussion

43.	Iron is prepared from one of its ore hematite Fe_(2)O_(3) by reaction with carbon as follows: Fe_(2)O_(3)(s)+C(s)rarrFe(s)+CO_(2)(g)uparrow Above reaction occur in an open furnance. If carbon was taken in limiting quality, as a result finally 100kg of crude iron (a mixture of Fe_(2)O_(3) and Fe) was obtained. And crude iron has 56% pure Fe. Then what mass of Fe_(2)O was taken initially
Answer» 80kg 124kg 44kg 100kg Solution :`2Fe_(2)O_(3)(s)+3C(s)rarr4Fe(s)+3CO_(2)` after reaction 44kg 56 KG `n_(Fe(2)O_(3))"used"=n_(Fe)=("formed")/(2)=(56)/(56)xx(10^(3))/(2)` `w_(Fe_(2)O_(3))"used"=(160)/(2)kg=80kg` `w_(Fe_(2)O_(3))` initially taken =80+44=124kg

Discussion

44.	Iron is prepared from one of its ore hematite Fe_(2)O_(3) by reaction with carbon as follows: Fe_(2)O_(3)(s)+C(s)rarrFe(s)+CO_(2)(g)uparrow Above reaction occur in an open furnance. Mass of Carbon required to produce 112kg of pure iron:
Answer» 36kg 18kg 48kg 72kg Solution :`2Fe_(2)O_(3)(s)+3C(s)rarr12Fe(s)+3CO_(2)(G)uparrow` `n_(C)=(n_(Fe))/(4)xx3=(112)/(56)xx(3)/(4)` `w_(C)=(112)/(56)xx(3)/(4)xx18kg`

Discussion

45.	Iron is protected by coating it with a thin layer of:
Answer» Cu Zn Pb Mg Answer :B

Discussion

46.	IUPAC name of methylene chloride is dichloromethane.
Answer»

Discussion

47.	Iron is obtained on large scale from haematite,
Answer» By REDUCTION By OXIDATION By reduction FOLLOWED by oxidation By oxidation FOLLOWING by reduction Answer :B

Discussion

48.	IUPAC name of methyl ethyl ether is_____.
Answer» SOLUTION :METHOXYETHANE

Discussion

49.	Iron is obtained on large scale from Fe_2O_3 by:
Answer» REDUCTION with CO Reducing with Al calcination Passing `H_2` ANSWER :A

Discussion

50.	IUPAC name of mesityl oxide is
Answer» 4-methyl PENTA - 3 - none 4-methylpente - 3- none 4-methylphent -3-en-2- one 4-methyl ENT - 3-en- 1-one ANSWER :C

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

IUPAC name of secondary butyl alcohol is

IUPAC name of serine is

Iron sheets are galvanized mainly to :

IUPAC name of [Pt(NH_(3))_(3) (Br) (NO_(2))Cl]Cl is

IUPAC name of [Pt(NH_(3))_(2)Cl(NO_(2))] is:

IUPAC name of [Pt(NH_(3))_(2)Cl(NO_(2))] is

Iron scraps are advisable and advantageous than zinc scraps for reducing thelow grade copper ores. Why?

IUPAC name of [Pt(NH_(3))_(2)Cl(NO_(2))] is :

Iron rod is immersed in NaCl solution such that half its length is exposed to air and the other half immersed in NaCl solution. Which part is corroded and why ?

Iron rusts in the persence of :

Iron reacts with steam to form

Iron present in haemoglobin is an

The IUPAC name of phenetole is ________.

Iron pipes lying under acidic soil are often attached to blocks of magnesium offers protection to iron against corrosion because it

IUPAC name of pinacol is

Iron ores are dressed by :

Iron pipe are usually coated with zinc.

IUPAC name of phenatole is

ores dressing for iron by :

Iron, once dipped in concentrated H_(2)SO_(4), does not displace copper from copper sulphate solution, because

Write the IUPAC names of [Ni(CO)_(4)]co-ordination compounds.

Iron ore is concentrated by

Iron, once dipped in concentratred H_2SO_4 , does not displace copper from copper sulphate solution , because :

Iron occurs as body-centred as well as face centred cubic systems. If the effectiveness radius of an atom of iron is 124 pm, calculate the density of iron in both the structures.

IUPAC name of oxalic acid is :

The iron obtained from the blast furnace is called as

Iron metal is produced commercially by reducing iron (III) oxide in iron ore with carbon monoixde :

IUPAC name of the complex, Ni(CO)_4 is

Iron nails are dipped into blue copper sulphate solution. After sometime iron nails are

IUPAC name of neo-pentyl halide is

Iron loses magnetic property at

IUPAC name of Na_3[Al(C_2O_4)_3] is

Iron is rendered passive when treated with conc. :

Iron is rendered passive by treatment with concentrated :

Iron is rendered passive in concentrated :

Iron is rendered passive by treatment with:

IUPAC name of Na_3[CO(ONO)_6] is :

Iron is rendered passive by the action of

Iron is prepared from one of its ore hematite Fe_(2)O_(3) by reaction with carbon as follows: Fe_(2)O_(3)(s)+C(s)rarrFe(s)+CO_(2)(g)uparrow Above reaction occur in an open furnance. In above question number 8 how much carbon was consumed.

IUPAC name of Na_(3)[Co(NO_(2))_(6)] is

Iron is rendered passive by

IUPAC name of methyl n-propyl ether is

Iron is prepared from one of its ore hematite Fe_(2)O_(3) by reaction with carbon as follows: Fe_(2)O_(3)(s)+C(s)rarrFe(s)+CO_(2)(g)uparrow Above reaction occur in an open furnance. Mass of Carbon required to produce 112kg of pure iron:

Iron is protected by coating it with a thin layer of:

IUPAC name of methylene chloride is dichloromethane.

Iron is obtained on large scale from haematite,

IUPAC name of methyl ethyl ether is_____.

Iron is obtained on large scale from Fe_2O_3 by:

IUPAC name of mesityl oxide is