94420 + Interview Questions in Chemistry in Class 12

1.	In diborane, the boron is ………………. Hybridised.
Answer» ANSWER :`SP^(3)`

Discussion

2.	In diborane molecule,
Answer» 4 BRIDGED HYDROGENS & 2 terminal hydrogens are present 2 bridged hydrogens & 4 terminal hydrogens are present 3 bridged hydrogens &3 terminal hydrogens are present None of these Answer :B

Discussion

3.	In diborane (B_2H_6) there are :
Answer» three `3C - 2e^(-)` bonds and three `2C - 2e^(-)` bonds four `3c - 2e^(-)` bonds and two `2c - 2e^(-)` bonds two `3c - 2e^(-)` bonds and four `2c - 2e^(-)` bonds NONE of the above Answer :C

Discussion

4.	In diazotisation reaction, carbolic acid is prepared from
Answer» curnene chlorobenzene aniline sod. phenoxide Answer :C

Discussion

5.	In determination of boiling points, the Van- der-Waal's force is likely to hp dominant in.....
Answer» `Br_(2)`<BR>HCL `H_(2)S` `NH_(3)` Solution :`Br_(2)` is a non-polar molecule.

Discussion

6.	In diamond carbon is……hybridised.
Answer» SP `sp^2` `sp^3` None Answer :C

Discussion

7.	In deriving the kinetic equation we make use of the root mean square speed of the molecules which is :
Answer» The average speed of molecules The most probable speed of molecules The square root of the average of the square of the speed of the molecules The most ACCURATE FORM in which speed can be used in the calculations Answer :C

Discussion

8.	In Delhi on a polluted day, concentration of SO_(2) in air is 40ppm. Assuming density of air is 2gm/litre. How many gram of SO_(2) is present in 100 litre of air?
Answer» 4mg 4gm `8xx10^(-3)kg` 8mg Solution :`40ppm=("Mass of" SO_(2))/("Mass of AIR")xx10^(6)RARR"Mass of" SO_(2)=(40xx"Mass of air")/(10^(6))` `d_("air")=("Mass of air")/(V_("air")(lit.))=(2GM)/(lit.)rArr"Mass of air"=2xx100=200gm` Mass of `SO_(2)=(400xx200)/(10^(6))=8xx10^(-3)gmrArr 8mg`

Discussion

9.	In dehydration of alcohol 1^(st) step is
Answer» FORMATION of carbonium ion formation of carbonion LOSS of PROTON from carbonium ion protonated of ALCOHOL Answer :D

Discussion

10.	In deep sea diving, the disease called bends or decompression sickness is caused due to dissolution of ……………….in the blood.
Answer» SOLUTION :NITROGEN GAS

Discussion

11.	In Daniel cell zinc displaces copper from CuSO^(4) solution since it has
Answer» LOWER OXIDATION potential higher oxidation potential equivalent oxidation potential higher REDUCTION potential Solution :emf series position.

Discussion

12.	In Daniel cell, the charges developed by Zn//Zn^(2+) and Cu//Cu^(2+) are ________
Answer» POSITIVE, positive negative, negative positive, negative negative, positive Answer :D

Discussion

13.	In deacon's process the catalyst used is :
Answer» `CoCl_2` `CuCl_2` `Cu_2Cl_2` `MnO_2` ANSWER :A

Discussion

14.	In dark, which of the following reacts with hydrogen
Answer» `Br_(2)` `F_(2)` `I_2` `Cl_(2)` Solution :`H_(2) +F_(2) to 2HF`

Discussion

15.	In cyclic structure of lactose glycosidic linkage present between
Answer» C-1 of `BETA`-D-glucopyranose and C-2 of `beta`-D-galactopyranose C-4 of `beta`-D-glucopyranose and C-1 of `beta`-D-galactopyranose C-1 of `beta`-D-glucopyranose and C-4 of `beta`-D-galactopyranose C-4 of `beta`-D-glucopyanose and C-1 of `beta`-D-galactopyranose Answer :B

Discussion

16.	In d-block elements, ul"(n - 2)d-subshell is incomplete"
Answer» SOLUTION :(n-1) d-subshell is INCOMPLETE

Discussion

17.	In cyclic structure of maltose, acetal bond is formed between
Answer» C-2 of ONE GLUCOPYRANOSE and C-2 of ANOTHER glucopyranose C-1 of one glucopyranose and C-2 of another glucopyranose C-1 of one glucopyranose and C-4 of another glucopyranose C-1 of one glucopyranose and C-4 of fructofurnose Answer :C

Discussion

18.	In cyclic structure of cellulose glycosidic bond present in between
Answer» C-1 of `BETA`-D-glucopyranose and C-4 of `beta`-D-galactopyranose C-1 of `beta`-D-glucopyranose and C-4 of `beta`-D-galactopyranose C-1 of `beta`-D-glucopyranose and C-4 of `beta`-D-galactopyranose C-1 of `beta`-D-glucopyanose and C-4 of `beta`-D-galactopyranose Answer :A

Discussion

19.	In cyclic structure of cellobiose acetal bond is formed between
Answer» C-1 of `BETA`-D-glucopyranose and C-2 of `beta`-D-galactopyranose C-1 of `beta`-D-glucopyranose and C-4 of `beta`-D-galactopyranose C-1 of `beta`-D-glucopyranose and C-4 of `beta`-D-galactopyranose C-1 of `beta`-D-glucopyanose and C-4 of `beta`-D-galactopyranose Answer :B

Discussion

20.	In cyclic structure of cane sugar glycosidic bond is formed in between
Answer» C-1 of `ALPHA`-D-GLUCOPYRANOSE and C-5 of `BETA`-D-fructofuranose `C-5 of `alpha`-D-glucopyranose and C-1 of `beta`-D-glucopyranose C-1 of `alpha`-(D)-glucopyranose and C-2 of `beta`-(D)-fructofuranose C-2 of `alpha`-(D)-glucopyranose and C-1 of `beta`-(D)-fructofuranose Answer :C

Discussion

21.	In cyanidation of gold and silver the formation of HCN is prevented by addition of ........
Answer» `H_2SO_4` `NaCN` `NaOH` `Pb(NO_3)_2` SOLUTION :At a low pH, the NaCN or KCN produces a toxic GAS HCN. Thus, MEDIUM of REACTION is maintained alkaline to prevent FORMATION of HCN `H^(+) + NaCN to HCN + Na^(+)`

Discussion

22.	In CuSO_4 solution, on adding excess of NH_4OH.the solution turns blue due to the formation of:
Answer» `CuSo_4NH_4OH` `[CU(NH_3)_4]SO_4` `[Cu(NH_3)_2](So_4)_2` `Cu(OH)_2` Answer :B

Discussion

23.	In Cu-Zn cell
Answer» Reduction OCCURS at the COPPER cathode oxidation occurs at the copper cathode Reduction occurs at the anode Chemical ENERGY is CONVERTED to LIGHT energy Solution :Because the reduction potential of Cu is highest.

Discussion

24.	In CsCl structure, the coordination number of Cs^(+) is
Answer» Equal to that of `Cl^(-)`, that is 6 Equal to that of `Cl^(-)` that is 8 Not equal to that of `Cl^(-)`, that is 6 Not equal to that of `Cl^(-)`, that is 8 Solution :`Cl^(-)` ions in CSCL adopt BCC TYPE of packing.

Discussion

25.	In CsCl structure, the coordination numbers of Cs^(+) and Cl^(-) ions are respectively.
Answer» 8,8 8,6 6,8 6,6 Answer :B

Discussion

26.	In CsCl stricture, the coordination number ofCs^(+)is
Answer» EQUAL of that of`CL^(-)` , that is 6 Equla to that of`Cl^(-)`, that is 8 Not equla to that of`Cl^(-)` , that is 6 Not equla to that of `Cl^(-)`, that is 8 SOLUTION :Radius RATIO range `0.732-1.00`signifies co-ordination NUMBER 8 . In CsCl, co-ordination number ratio is 8 : 8.

Discussion

27.	In CsCI lattice the coordination number of Cs ion is
Answer» 8,8 4,4 6,6 8,4 Solution :CSCL has a bcc structure . Each `CS^+` ION is surrounded by 8 `Cl^-` ions and each `Cl^-` ion is surrounded by 8 `Cs^+` ions. Thus, the structure has 8:8 coordination number.

Discussion

28.	In crystals, atoms are located at the position of …….
Answer» MAXIMUM POTENTIAL energy Zero potential energy INFINITE potential energy Minimum potential energy Answer :D

Discussion

29.	In crystalline solid, atoms, ions or molecules are held in an orderly array. But some point defect is observed in a crystal, when a vacancy is created by an atom or ion dislocated from its normal position to an interstitial site. What is the defect called?
Answer» ANSWER :FRENKEL DEFECT

Discussion

30.	In crystal structure of rock salt (NaCI), the arrangement of CI^- ion is:
Answer» FCC bcc Both (a) and (B) None Answer :A

Discussion

31.	In Cr_(2) O _(7)^(2-) , Cr -O-Cr bond anlge is
Answer» `109^(@)` `126^(@)` `180^(@)` `90^(@)` ANSWER :B

Discussion

32.	In Cr_(2)O_(7)^(2-) :
Answer» 4 Cr-O BONDS are EQUIVALENT 6 Cr-O bonds are equivalent all Cr-O bonds are equivalent all Cr-O bonds are non equivalent Answer :B

Discussion

33.	In [Cr(NH_3)_4CI_2]CI the ligands are:
Answer» `NH_3` `CI^-` only Both `NH_3` and `CI^-` `CR,NH_3,CI^-` ANSWER :C

Discussion

34.	In countries nearer to polar region, the rods are sprinkled with CaCl_(2). This is
Answer» To minimisethe snow FALL To minimise pollution To minimise the accumulation of dust on the road To minimise the wear and tear of the roads SOLUTION :`CaCl_(2)` acts as a non-volatile solute and results in depression in freezing point. Thus, snow fall is reduced and PREVENTS blocking of roads in the polar REGION.

Discussion

35.	In countries nearer to polar region, the roads are sprinkled with CaCl_2. This is
Answer» to minimise the snow FALL to minimise POLLUTION to minimise the accumulation of dust on the road to minimise the wear and tear of the roads SOLUTION :`CaCl_2` acts as a non-volatile solute and RESULT indepressionin freezing POINT. Thus, snow fall is reduced and prevents blocking of roads in the polar region.

Discussion

36.	In countries nearer to polar region , the roads are sprinkled with CaCl_2 . This is
Answer» To MINIMUM the effect of SNOW on roads To minimise pollution To minimise the accumulation of dust on the road To minimise the WEAR and tear of the roads. Answer :A

Discussion

37.	In Costner's process the correct anodic reaction and the type of reaction occurs at anode is
Answer» `OH^(-) to H_(2)+O_(2)` Reduction `4OH^(-)to 2H_(2)O_()+I_(2) +4e^(-)` OXIDATION `2OH^(-) to H_(2)+O_(2)` Oxidation None Solution : In Castner.s process the correct ANODIC reaction is `4OH^(-) to 2H_(2)O_(2)+O_(2)+4e^(-)` (Oxidation)

Discussion

38.	In corundum, oxide ions are arranged in hcp arrangement and the aluminium ions occupy two-third of the octahedral holes. Its formula is :
Answer» `Al_(2)O_(4)` `Al_(2)O_(3)` `Al_(3)O_(4)` `AlO_(2)` Solution :In a close packed arrangement, there is one octahedral site corresponding to each atom constituting the lattice. No. of oxide ions per UNIT CELL in hcp = 6. No. of octahedral holes `= 6 xx1 = 6` Formula of compound `=Al_(4) O_(6) ` or `Al_(2) O_(3)`

Discussion

39.	In corrosion of Fe, anode is
Answer» FE in CONTACT with water Fe contact with air that where `Fe^(2+)` is CONVERTED to `Fe^(3+)` that where `H_(2)O` is converted to `O_(2)`3 Solution :Electromechanism of RUSTING.

Discussion

40.	In-correct statement among the following is
Answer» methanamine is more basic than AMMONIA ammonia FORMS H-bonds BOILING POINT of ethyl amine is higher than propane dimethyl amine is less basic than aniline Answer :D

Discussion

41.	In correct statement about given carbohydrate is
Answer» Above COMPOUND is a REDUCING sugar Above compound UNDERGO mutarotation Above compound is a non-reducing sugar Above compound has a GLYCOSIDIC linkag Answer :C

Discussion

42.	In coordination chemistry there are a veriety of methods applied to find out the structure of complexes. One method involves treating the complex with known reagents and from the nature of reaction, the formula0 of the complex can be predicted. An isomers of the complex Co(en)_(2)(H_(2)O)Cl_(2)Br, on reaction withconcentrated H_(2)SO_(4) (dehydrating agent ) it suffers loss in weight and on reaction with AgNO_(3) solution it gives a white precipitate which is soluble in NH_(3)(aq). The number of geometrical isomers of the formula of the above original complex are (including the complex ) :
Answer» 2 3 4 1 Answer :A

Discussion

43.	In coordination chemistry there are a veriety of methods applied to find out the structure of complexes. One method involves treating the complex with known reagents and from the nature of reaction, the formula0 of the complex can be predicted. An isomers of the complex Co(en)_(2)(H_(2)O)Cl_(2)Br, on reaction withconcentrated H_(2)SO_(4) (dehydrating agent ) it suffers loss in weight and on reaction with AgNO_(3) solution it gives a white precipitate which is soluble in NH_(3)(aq). If one moles of original complex is treated with excess (Pb(NO_(3))_(2) solution, then the number of moles of white precipitate ( of PbCl_(2)) formed will be :
Answer» 0.5 `1.0` `0.0` `3.0` ANSWER :A

Discussion

44.	In coordination chemistry there are a veriety of methods applied to find out the structure of complexes. One method involves treating the complex with known reagents and from the nature of reaction, the formula0 of the complex can be predicted. An isomers of the complex Co(en)_(2)(H_(2)O)Cl_(2)Br, on reaction withconcentrated H_(2)SO_(4) (dehydrating agent ) it suffers loss in weight and on reaction with AgNO_(3) solution it gives a white precipitate which is soluble in NH_(3)(aq). Similarly if all the ligands in the coordination sphere be replaced by CO_(2)^(-), then the magnetic moment of the complex ion ( due to spin only ) will be :
Answer» 1.73 BM 0.0 BM 4.9 BM 5.9 BM Answer :B

Discussion

45.	In coordination compounds, the primary valences are normally satisfied by negative ions.
Answer» ANSWER :1

Discussion

46.	In- correct statement about aniline is
Answer» It is LESS basic than ethyl amine It is steam volatile On reaction with NA, It gives `H_2` It is highlysoluble in WATER Answer :D

Discussion

47.	In coordination compounds, the hydrate isomers differ in :
Answer» the NUMBER of WATER molecule of HYDRATION only the number of water molecules present as LIGANDS Both (a) and (B) their coordination number of the metal atom Answer :C

Discussion

48.	In coordination chemistry there are a veriety of methods applied to find out the structure of complexes. One method involves treating the complex with known reagents and from the nature of reaction, the formula0 of the complex can be predicted. An isomers of the complex Co(en)_(2)(H_(2)O)Cl_(2)Br, on reaction withconcentrated H_(2)SO_(4) (dehydrating agent ) it suffers loss in weight and on reaction with AgNO_(3) solution it gives a white precipitate which is soluble in NH_(3)(aq). If all the ligands in the coordination sphere of the above complex be replaced by F^(-), then the magnetic moment of the complex ion ( due to spin only ) will be :
Answer» 2.8 BM 5.9 BM 4.9 BM 1.73 BM Answer :C

Discussion

49.	In coordination chemistry there are a variety of methods applied to find out the structure of complexes. One method involves treating the complex with known reagents and from the nature of raction, the formula of the complex can be predicted. An isomer of the complex Co(en)_(2)(H_(2)O)Cl_(2)Br, on reaction with concentrated H_(2)SO_(4) (dehydrating agent), suffers loss in weight and on reaction with AgNO_(3) solution it gives a white precipitate which is soluble in NH_(3)(aq). If one mole of original complex is treated with excess Pb(NO_(3))_(2) solution, then the number of moles of white precipitate (of PbCla_(2)) formed will be :
Answer» 0.5 `1.0` `0.0` `3.0` SOLUTION :Applying POAC on CL, we GET, `1xx1=n_(PbCl_(2))xx2`

Discussion

50.	In coordination chemistry there are a variety of methods applied to find out the structure of complexes. One method involves treating the complex with known reagents and from the nature of raction, the formula of the complex can be predicted. An isomer of the complex Co(en)_(2)(H_(2)O)Cl_(2)Br, on reaction with concentrated H_(2)SO_(4) (dehydrating agent), suffers loss in weight and on reaction with AgNO_(3) solution it gives a white precipitate which is soluble in NH_(3)(aq). The number of geometrical isomers of the formula fo the above original complex are (including the complex) :
Answer» 2 3 4 1 Solution :`[M(AA)_(2))AB] implies"cis form and trans form"`.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

In diborane, the boron is ………………. Hybridised.

In diborane molecule,

In diborane (B_2H_6) there are :

In diazotisation reaction, carbolic acid is prepared from

In determination of boiling points, the Van- der-Waal's force is likely to hp dominant in.....

In diamond carbon is……hybridised.

In deriving the kinetic equation we make use of the root mean square speed of the molecules which is :

In Delhi on a polluted day, concentration of SO_(2) in air is 40ppm. Assuming density of air is 2gm/litre. How many gram of SO_(2) is present in 100 litre of air?

In dehydration of alcohol 1^(st) step is

In deep sea diving, the disease called bends or decompression sickness is caused due to dissolution of ……………….in the blood.

In Daniel cell zinc displaces copper from CuSO^(4) solution since it has

In Daniel cell, the charges developed by Zn//Zn^(2+) and Cu//Cu^(2+) are ________

In deacon's process the catalyst used is :

In dark, which of the following reacts with hydrogen

In cyclic structure of lactose glycosidic linkage present between

In d-block elements, ul"(n - 2)d-subshell is incomplete"

In cyclic structure of maltose, acetal bond is formed between

In cyclic structure of cellulose glycosidic bond present in between

In cyclic structure of cellobiose acetal bond is formed between

In cyclic structure of cane sugar glycosidic bond is formed in between

In cyanidation of gold and silver the formation of HCN is prevented by addition of ........

In CuSO_4 solution, on adding excess of NH_4OH.the solution turns blue due to the formation of:

In Cu-Zn cell

In CsCl structure, the coordination number of Cs^(+) is

In CsCl structure, the coordination numbers of Cs^(+) and Cl^(-) ions are respectively.

In CsCl stricture, the coordination number ofCs^(+)is

In CsCI lattice the coordination number of Cs ion is

In crystals, atoms are located at the position of …….

In crystalline solid, atoms, ions or molecules are held in an orderly array. But some point defect is observed in a crystal, when a vacancy is created by an atom or ion dislocated from its normal position to an interstitial site. What is the defect called?

In crystal structure of rock salt (NaCI), the arrangement of CI^- ion is:

In Cr_(2) O _(7)^(2-) , Cr -O-Cr bond anlge is

In Cr_(2)O_(7)^(2-) :

In [Cr(NH_3)_4CI_2]CI the ligands are:

In countries nearer to polar region, the rods are sprinkled with CaCl_(2). This is

In countries nearer to polar region, the roads are sprinkled with CaCl_2. This is

In countries nearer to polar region , the roads are sprinkled with CaCl_2 . This is

In Costner's process the correct anodic reaction and the type of reaction occurs at anode is

In corundum, oxide ions are arranged in hcp arrangement and the aluminium ions occupy two-third of the octahedral holes. Its formula is :

In corrosion of Fe, anode is

In-correct statement among the following is

In correct statement about given carbohydrate is

In coordination compounds, the primary valences are normally satisfied by negative ions.

In- correct statement about aniline is

In coordination compounds, the hydrate isomers differ in :