94420 + Interview Questions in Chemistry in Class 12

1.	The most active carbonyl compound is
Answer» `HCHO` `CH_(3)CHO` `CH_(3)COCH_(3)` `C_(2)H_(5)CHO` ANSWER :A

Discussion

2.	The maximum oxidation state shown by Mn in its compounds is :
Answer» `+4` `+5` `+6` `+7` Solution :Mn shows + 7 OXIDATION STATE in PERMANGANATE ion `(MnO_(4)^(-))`

Discussion

3.	The most acidic of the following is
Answer» `ClCH_(2)COOH` `C_(6)H_(5)COOH` `CD_(3)COOH` `CH_(3)CH_(2)COOH` Solution :Any electron withdrawing substituent (having-I-effect) STABILISES the anion by dispersing the negative charge AD THEREFORE, INCREASES the acidity. Chlorine is an electron withdrawing group.

Discussion

4.	The most acidic among the followingis :
Answer» `TeO_(2)` `SeO_(2)` `SO_(2)` `PoO_(2)` ANSWER :C

Discussion

5.	The maximum oxidation state of osmium is
Answer» `+6` `+7` `+8` `+5` ANSWER :c

Discussion

6.	The most acidic compound in water is
Answer» `AlCl_(3)` `BeCl_(2)` `FeCl_(2)` None of these Answer :C

Discussion

7.	The maximum oxidation state of chromium is :
Answer» `+6` `+4` `+8` `+7` ANSWER :A

Discussion

8.	The most acidic among the following is :
Answer» `CH_3CH_2OH` `C_6H_5OH` `CH_3COOH` `CH_3CH_2CH_2OH` ANSWER :C

Discussion

9.	The most acidic and thermally stable hydride of chalcogens are respectively
Answer» `H_(2)O, H_(2)TE` `H_(2)Te, H_(2)S` `H_(2)S, H_(2)TS` `H_(2)Te,H_(2)O` ANSWER :D

Discussion

10.	The most accepted electronic configuration of f-block element is
Answer» `(n-2) s^(2), p^(6) , d^(10) , f(0-14), (n-1) s^(2), p^(6) d^(0-1) , NS^(0-2)` `(n-2) s ^(2), p^(6), d^(10) , f^(1-14), (n-1) s ^(2),p^(6)d ^(0-1) , ns^(2)` `(n-2) s^(2), p ^(6), d ^(10),f ^(0-14) , (n-1) s^(2), p ^(6)d^(1) , ns^(0-1)` `(n-2) s ^(2), p^(6) , d^(10) , f^(0-14) , (n-1) s^(2), p ^(6)d^(1), ns^(2) ` Answer :B

Discussion

11.	Most acidic oxide among the following is
Answer» `CH_3CH_2OH` `C_6H_5OH` `CH_3COOH` `CH_3CH_2CH_2OH` ANSWER :C

Discussion

12.	The maximum oxidation state in 3d series elements is shown by
Answer» Cu V Mn Fe Answer :C

Discussion

13.	The most acidic among the following is _______ .
Answer» p - nitrophenol p - hydroxy benzoic acid o - hydroxy benzoic acid p - TOLUIC acid Answer :C

Discussion

14.	The maximum oxidation state exhibited by actinide ions is
Answer» `+5` `+4` `+7` `+8` ANSWER :C

Discussion

15.	The most accepted abserved electronic configuration of lanthanide is
Answer» `6S^(2), 4f^(0-14) , 5D^(1)` `6s^(2), 4f ^(1-14) , 5d ^(0-1)` `6s^(2), 4f^(2-14), 5d ^(0-1)` `6s^(2), 4f ^(2-14), 5d^(1)` Answer :B

Discussion

16.	The maximum oxidation state exhibited by actinide ions is :
Answer» ` + 5` `+4` `+7` `+8` Answer :C

Discussion

17.	The most abundant transition element is present in ……
Answer» 3D series 4d series 5d series 6d series Solution :FE is most ABUNDANT TRANSITION ELEMENT

Discussion

18.	The maximum oxidation number of transition metals may be :
Answer» `+4` `+6` `+8` `+10` ANSWER :C

Discussion

19.	The maximum numbr of 90^(@) angles between bond pair bond pair of electrons is observed in
Answer» `DSP^(3)` hybridisation `sp^(3)d` hybridisation `dsp^(2)` hybridisation `sp^(3)d^(2)` hybridisation. Solution :`sp^(3)d^(2)`- hybridisation has an octahedral structure such that FOUR HYBRID orbitals are at `90^(@)` with respect to each other and OTHERS two at `90^(@)` with first four.

Discussion

20.	The most abundant transition metal in earth crust is :
Answer» Zn Fe Hg Au Answer :B

Discussion

21.	The most abundant organic compound in the world is:
Answer» `CH_4` Chlorophyll Alkaloids Cellulose Answer :D

Discussion

22.	The maximum number of unpaired electrons present in 4f-energy level is:
Answer» 5 7 10 6 Answer :B

Discussion

23.	The maximum number of stereoisomers that could exist for the compound below ?
Answer» 6 8 10 16 Solution :When moleculeis symmetrical and has even no. of CHIRAL centres then TOTAL no. of isomers `""underset(O.A.)"=2"^(n-1)underset(meso)+"2"^(n)//^(2-1)` (O.A.-Optically ACTIVE )

Discussion

24.	The maximum number of unpaired electrons exists in:
Answer» `O_2` `O_2^-` `O_2^(2-)` `O_2^(2+)` ANSWER :A

Discussion

25.	The most abundant ore of iron is :
Answer» Haematite Limonite Magnetite Siderite Answer :A

Discussion

26.	The most abundant ore of Fe is
Answer» LIMONITE MAGNETITE siderite Answer :A

Discussion

27.	The maximum number of stereoisomers possible for 2-hydroxy-2-methyl butanoic acid is
Answer» 1 2 3 4 Solution :`{:(""CH_(3)),("\|"),(COOH-C^(**)-CH_(2)-CH_(3)),("\|"),(""OH):}` ONE chiral CENTRE. Therefore TWO forms are possible.

Discussion

28.	The maximum number of stereoisomers possible for 3-hydroxy-2-methyl butanoic acid is:
Answer» 1 2 3 4 Answer :D

Discussion

29.	The most abundant metal is the earth's crust is
Answer» iron aluminium cobalt manganese Answer :B

Discussion

30.	The most abundant metal in earth's crust is:
Answer» iron magnesium calcium aluminium Answer :D

Discussion

31.	The mostabundant metalin theearth'scrustis ………… .
Answer» ANSWER :ALUMINIUM

Discussion

32.	The maximum number of stereo isomers possible for 2-hydroxy - 2-methyl butanoic acid is :
Answer» 1 2 3 4 Answer :D

Discussion

33.	The most abundant metal in the earth crust is :
Answer» Na Ca AL Fe Answer :C

Discussion

34.	The maximum number of possible optical isomers in 1-bromo-2-methyl cyclobutane is :
Answer» 4 2 8 16 Solution :STRUCTURE of 1-bromo-2-methylcyclobutane is Thismolecule cannot be divided into two equal HALVES ,i.e., the molecule has no symmetry and n is the number if d-and-l-forms,`a=2^(n)=2^(2)=4` The number of meso forms ,m=0 TOTAL no. of optical isomers=a+m=4+0=4.

Discussion

35.	The most abundant isotope of hydrogen is:
Answer» Tritium Deuterium Protium Para hydrogen Answer :C

Discussion

36.	The most abundant inert gas in the atmosphere is
Answer» He Ne Ar Kr Answer :C

Discussion

37.	The maximum number of P-H bonds are contained in which of the following molecules
Answer» <P>`H_(3)PO_(2)` `H_(3)PO_(3)` `H_(3)PO_(4)` `H_(4)P_2O_(7)` Solution :`H_(3)PO_(2) to H-overset(O)overset(uarr)underset(H)underset(\|)(P)-OH` `H_(3)PO_3 to H-overset(O)overset(uarr)underset(OH)underset(\|)(P)-OH` `H_(3)PO_(4) to HO-overset(O)overset(uarr)underset(OH)underset(\|)(P)-OH` `H_(4)P_(2)O_(7) to HO-overset(O)overset(uarr)underset(OH)underset(\|)(P)-O-overset(O)overset(uarr)underset(OH)underset(\|)(P)-OH` MAXIMUM NUMBER of P-H BONDS are is present in `H_(3)PO_(2)`

Discussion

38.	The most abundant inert gas in air is:
Answer» He Ne Ar Kr Answer :C

Discussion

39.	Which is most abundant hydrocarbon pollutant
Answer» METHANE ETHANE ACETYLENE BENZENE ANSWER :A

Discussion

40.	The most abundant gas in ordinary air among the following is :
Answer» ARGON Helium Carbon dioxide Carbon monoxide Answer :A

Discussion

41.	The maximum number of planes having maximum number of identical atoms in PCl_(5) will be.
Answer» SOLUTION :`PCl_(5)` is TRIGONAL bipyramidal.

Discussion

42.	The most abundant elements by mass in the body of a helthy human adult are : Oxygen (61.4%), Carbon (22.9%), Hydrogen (10.0%) and Nitrogen (2.6%) The weight which a 75 kg person would gain if all the .^(1)H atoms are replaced by .^(2)H atoms is
Answer» 7.5 kg 10 kg 15 kg 37.5 kg Solution :As the human ADULT CONTAINS `10%` of `.^(1)H`, `therefore .^(1)G" present"=(10)/(100)xx75=7.5kg` If all `.^(1)H` were replaced by `.^(2)H`, i.e., each atom has double the weight now, then gain in weight = 7.5 kg (H now present will be 15 kg).

Discussion

43.	The most abundant elements by mass in the body of a healthy human adult are : Oxygen (61.4%) , Carbon (22.9%), Hydrogen (10.0%) , and Nitrogen (2.6%). The weight which a 75 kg person would gain if all ""^(1)H atoms are replaced by ""^(2)H atoms is
Answer» `15 KG` `37.5 kg` `7.5 kg` `10 kg` ANSWER :C

Discussion

44.	The maximum numberof molesof an acetylatingagent, consumedby a moleof each of 1^(0),2^(0) and3^(0)aminesarerespectively.
Answer» 2, 3 and4 1,2 and 3 2,1 and 0 0,2 and 1 ANSWER :C

Discussion

45.	The most abundant elements by mass in the body of a healthy human adult are: Oxygen (61.4%), carbon (22.9%), hydrogen (10.0%) and Nitrogen (2.6%) the weight which a 75 kg person would gain if all .^(1)H atoms are replaced by .^(2)H atoms is
Answer» 15kg 37.5kg 7.5kg 10kg Solution :Mass of hydrogen in healthy human audlt `=75xx(10)/(100)` =7.5kg if `._(1)^(1)H` isotope is replaced by `._(1)^(2)H` the mass of hydrogen =15G Net gain in mass `=15kg-7.5kg` =7.5kg

Discussion

46.	The maximum number of N-Co-O bond angle in [Co(gly_(3))]^(@) is :
Answer» SOLUTION : EachN can have 3 TYPES of N-Co-O. So, TOTAL 3 N are PRESENT.

Discussion

47.	The most abundant element in the earth's crust (by weight ) is :
Answer» SI Al O Fe Solution :OXYGEN is the most abundant element (46.6%) in earth's CRUST.

Discussion

48.	The most abundant element in the earth's crust (by weight) is :
Answer» Si Al O Fe Answer :C

Discussion

49.	The most abundant element in the earth's crust is:
Answer» Oxygen Aluminium Silicon None of these Answer :A

Discussion

50.	The maximum number of moles of Ba_(3)(PO_4)_(2) that can be formed if 2 mole BaCl_2 is mixed with 1 mole Na_3PO_(4) is
Answer» 0.66 0.25 0.33 0.5 Answer :D

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The most active carbonyl compound is

The maximum oxidation state shown by Mn in its compounds is :

The most acidic of the following is

The most acidic among the followingis :

The maximum oxidation state of osmium is

The most acidic compound in water is

The maximum oxidation state of chromium is :

The most acidic among the following is :

The most acidic and thermally stable hydride of chalcogens are respectively

The most accepted electronic configuration of f-block element is

Most acidic oxide among the following is

The maximum oxidation state in 3d series elements is shown by

The most acidic among the following is _______ .

The maximum oxidation state exhibited by actinide ions is

The most accepted abserved electronic configuration of lanthanide is

The maximum oxidation state exhibited by actinide ions is :

The most abundant transition element is present in ……

The maximum oxidation number of transition metals may be :

The maximum numbr of 90^(@) angles between bond pair bond pair of electrons is observed in

The most abundant transition metal in earth crust is :

The most abundant organic compound in the world is:

The maximum number of unpaired electrons present in 4f-energy level is:

The maximum number of stereoisomers that could exist for the compound below ?

The maximum number of unpaired electrons exists in:

The most abundant ore of iron is :

The most abundant ore of Fe is

The maximum number of stereoisomers possible for 2-hydroxy-2-methyl butanoic acid is

The maximum number of stereoisomers possible for 3-hydroxy-2-methyl butanoic acid is:

The most abundant metal is the earth's crust is

The most abundant metal in earth's crust is:

The mostabundant metalin theearth'scrustis ………… .

The maximum number of stereo isomers possible for 2-hydroxy - 2-methyl butanoic acid is :

The most abundant metal in the earth crust is :

The maximum number of possible optical isomers in 1-bromo-2-methyl cyclobutane is :

The most abundant isotope of hydrogen is:

The most abundant inert gas in the atmosphere is

The maximum number of P-H bonds are contained in which of the following molecules

The most abundant inert gas in air is:

Which is most abundant hydrocarbon pollutant

The most abundant gas in ordinary air among the following is :

The maximum number of planes having maximum number of identical atoms in PCl_(5) will be.

The most abundant elements by mass in the body of a helthy human adult are : Oxygen (61.4%), Carbon (22.9%), Hydrogen (10.0%) and Nitrogen (2.6%) The weight which a 75 kg person would gain if all the .^(1)H atoms are replaced by .^(2)H atoms is

The most abundant elements by mass in the body of a healthy human adult are : Oxygen (61.4%) , Carbon (22.9%), Hydrogen (10.0%) , and Nitrogen (2.6%). The weight which a 75 kg person would gain if all ""^(1)H atoms are replaced by ""^(2)H atoms is

The maximum numberof molesof an acetylatingagent, consumedby a moleof each of 1^(0),2^(0) and3^(0)aminesarerespectively.

The most abundant elements by mass in the body of a healthy human adult are: Oxygen (61.4%), carbon (22.9%), hydrogen (10.0%) and Nitrogen (2.6%) the weight which a 75 kg person would gain if all .^(1)H atoms are replaced by .^(2)H atoms is

The maximum number of N-Co-O bond angle in [Co(gly_(3))]^(@) is :

The most abundant element in the earth's crust (by weight ) is :

The most abundant element in the earth's crust (by weight) is :

The most abundant element in the earth's crust is:

The maximum number of moles of Ba_(3)(PO_4)_(2) that can be formed if 2 mole BaCl_2 is mixed with 1 mole Na_3PO_(4) is