94420 + Interview Questions in Chemistry in Class 12

1.	OMG is used for the qualitative chemical analysis of
Answer» `NI^(+2)` `CI^(+3)` `FE^(+2)` `Mn^(+2)` Answer :A

Discussion

2.	Omega^(-1) m^(-1) is the unit of
Answer» Molar conductivity Specific conductivity EQUIVALENT conductivity Molar conductivity at INFINITE DILUTION . Solution :`OMEGA^(-1) m^(-1)` is the UNIT of specific conductivity .

Discussion

3.	Omeprazole and lansopyrazole are _______
Answer» ANSWER :ANTACIDS

Discussion

4.	Olis are purified by :
Answer» FRACTIONAL DISTILLATION STEAM distillation VACUUM distillation simple distillation Solution :N//A

Discussion

5.	Oleum or fuming H_(2)SO_(4) is
Answer» A mixture of conc. `H_(2)SO_(4)` and oil Sulphuric acid which GIVES fumes of sulhure dioxide Sulphuric acid SATURATED with sulphur TRIOXIDE, i.e., `H_(2) S_(2) O_(7)` A mixture of sulphuric acid and nitric acid Answer :C

Discussion

6.	Oligosaccharides contain _____ simple sugar units :
Answer» 2 to 10 4 to 8 6 to 12 6 to 10 Answer :A

Discussion

7.	Oleum or fuming H_2SO_4 is:
Answer» A MIXTURE of CONC.`H_2SO_4` and oil Sulphuric acid which gives fumes of SULPHUR dioxide Sulphuric acid saturated with Sulphur TRIOXIDE, i.e., `H_2S_2O_7` A mixture of sulphuric acid and nitric acid Answer :C

Discussion

8.	Oleum is pyrosulphuric acid.
Answer» ANSWER :1

Discussion

9.	Oleum is formed when .............is passed through conc. H_(2)SO_(4).
Answer» SOLUTION :`SO_(3)`

Discussion

10.	Oleum is formed when conc. H_2SO_4
Answer» REACTS with `SO_2` reacts with `SO_3` is refluxed is HEATED with ELEMENTAL sulphur Answer :B

Discussion

11.	Oleum is a mixture of:
Answer» `H_2SO_4 + SO_2` `H_2S_2O_8 + SO_2` `H_2SO_4 + SO_3` `H_2S_2O_3 + SO_3` ANSWER :C

Discussion

12.	Oleum is
Answer» a mixture CONC. `H_(2)SO_(4)` and oil sulphuric acid saturated with `SO_(3)` a mixture of `H_(2)SO_(4)` and `HNO_(3)` a mixture of `H_(2)SO_(4)` and HCl Answer :B

Discussion

13.	Oleum is:H_2S_2O_7,H_2S_2O_6,H_4S_2O_7,H_3S_2O_7.
Answer» `H_2S_2O_7` `H_2S_2O_6` `H_4S_2O_7` `H_3S_2O_7` ANSWER :A

Discussion

14.	Oleum is :
Answer» CASTOR oil oil of Vitriol fuming `H_2SO_4` NONE of these Answer :C

Discussion

15.	Oleic, stearic and palmitie acids are
Answer» NUCLEIC acids Amino acids Fatty acids None of these Answer :C

Discussion

16.	Oleic, stearic and palmitic acid are:
Answer» NUCLEIC acids Amino acids Fatty acids NONE Answer :C

Discussion

17.	Olefins are obtained from alcohols by heating with
Answer» `Al_2O_3` `LiAlH_4` `B_2H_6` `NaBH_4` ANSWER :A

Discussion

18.	Olefins can be hydrogenated by
Answer» ZINC and HCl Nascent hydrogen Raney Ni and `H_2` Lithium HYDRIDE in ether Solution :`underset"Ethene"(CH_2)=CH_2+H_2underset(300^@)OVERSET(Ni)to underset"Ethane"(CH_3-CH_3)`

Discussion

19.	Olefins can be halogenated in the allylic position by number of reagents of which N-bromo succinimide (NBS) is the most common. When this reagent is used the reaction is known as WohlZiegler bromination. Other N-bromoamides have also been used. To a much lesser extent allylic chlorination has been carried out with N-chloro-succinimide. N-Chloro-N-cyclohexyl benzene sulphonamide or t-hypochlorite when the allylic radical intermediate is unsymmetrical allylic rearrangement takes place so that the mixture of both possible products is obtained.CH_3 - CH_2 -CH = CH_2underset(hv)overset(NBS)(to) CH_3 - CH = CH - CH_2 - Br + CH_3 - undersetoverset(\|)(Br)(C ) - CH = CH_2NBS is also a highly regioselective brominating agent at other positions, including positions a to a carbonyl group. Which of the following is allylic chlorinating agent ?
Answer» N-Chlorosuccinimide Chloro-N-cyclohexyl BENZENE SULPHONAMIDE `SO_2Cl_2//hv` All of these Solution :CONCEPTUAL

Discussion

20.	Olefins are converted to paraffins by:
Answer» Hydrolysis Halogenation Dehydration Hydrogenation Answer :D

Discussion

21.	Oils contain a higher percentage of :
Answer» STEARIN Butyrin Olein Palmitin Answer :C

Discussion

22.	Oils are liquids at room temperature since they contain higher percentage of
Answer» OLEATES palmitates stearates myristates Solution :Oleates are gycerides of unsaturated OLEIC ACID. Glycerides of unsaturated acids are LIQUID at room TEMPERATURE.

Discussion

23.	Oils are converted into fats by
Answer» Hydration Decarboxylation Hydrogenation Dehydrogenation Solution :Oil are UNSATURATED ESTERS which are converted into FATS by saturating it by CATALYTIC hydrogenation

Discussion

24.	Oils are
Answer» TRIGLYCERIDES of SATURATED FATTY acids triglycerides of UNSATURATED fatty acids diglycerides of saturated fatty acids diglycerides of unsaturated fatty acids Answer :B

Discussion

25.	Oils and fats are stored by the addition of BHA and BHT because they prevent_______.
Answer» saponification reduction rancidification hydration Answer :C

Discussion

26.	Oils are :
Answer» PHOSPHOLIPIDS LIQUID FATS Steroids All Answer :B

Discussion

27.	Oils and fats are jointly called
Answer» Lipids Soaps Proteins Polymers Answer :A

Discussion

28.	Oils and facts in our food not only provide us energy but also act as carriers of certain vitamins such as:
Answer» A and B A and C B and C A and D Answer :D

Discussion

29.	Oils and facts in our food not only provide us energy but also act as carries of certain vitamins such as:
Answer» A and B A and C B and C A and D Answer :D

Discussion

30.	Oil used as frothing agent in froth floatation process is ............
Answer» PINE OIL OLIVE oil Mustard oil Turpentine oil ANSWER :A

Discussion

31.	Oil used as frother in froth floatation process
Answer» PINE OIL MUSTARD oil COCONUT oil Olive oil Answer :A

Discussion

32.	Oil soluble dye is mixed with water - in - oil emulsion then
Answer» dispersion MEIDUM is coloured disperssed phase is coloured Both (a) and (b) None of these Solution :Dye test oil soluble dye if the EMULSION acquires the colour of the dye it is water in oil TYPE emulsion

Discussion

33.	Oil soluble dye is mixed with emulsion and emulsion remains colourless then it is
Answer» 0-in-W W-in-O O-in-o W-in-W SOLUTION :Dye test OIL soluble dye = emulsion remains colourless it is oil in WATER type emulsion

Discussion

34.	Oil soluble dye is mixed with emulsion and emulsion remains colourless then, the emulsion is
Answer» O/W W/O O/O W/W Answer :A

Discussion

35.	Oil of winter green is
Answer» an ester a carboxylic acid an alcohol a ketone SOLUTION :Methyl salicylate (an ORGANIC ester) is the MAIN constituent of the oil of wintergreen.

Discussion

36.	Oil of winter green and salol are the esters of :
Answer» SALICYLIC ACID Lactic acid Acetic acid Sulphanillic acid ANSWER :A

Discussion

37.	Oil of vitriol is:
Answer» `H_2SO_4` `H_2SO_3` `H_2S_2O_7` `H_2S_2O_8` ANSWER :A

Discussion

38.	Oil of vitriol is:CuSO_4,H_2SO_4,Al_2(SO_4)_3,Na_2SO_4.
Answer» `CuSO_4` `H_2SO_4` `Al_2(SO_4)_3` `Na_2SO_4` ANSWER :B

Discussion

39.	Oil of vitriol is
Answer» `PbSO_4` `ZnSO_4.7H_2O` `CuSO_4.5H_2O` `H_2SO_4` ANSWER :D

Discussion

40.	Oil of mirbane is another name for :
Answer» ANILINE is stornger BASE than ammoia Nitrobenzene Toluene Toluidine Answer :B

Discussion

41.	Oil of mirbane is………………
Answer» nitrobenzene benzaldehyde methyl salicylate aspirin Answer :A

Discussion

42.	Oil gas is obtained in laboratory by :
Answer» HEATING of alcohol Cracking of kerosene Heating CASTOR oil Heating COCONUT oil Answer :B

Discussion

43.	Oil abtained from petroleum is called:
Answer» ESSENTIAL OIL VEGETABLE oil Mineral oil Animal oil Answer :C

Discussion

44.	Oif 28.0% of a sample of Ag-112 decays in 1.52h, what is the half-life of this isotope?
Answer» ANSWER :3.21h

Discussion

45.	Ohm's law is mathematically expressed as
Answer» `I=V/R` `I=R/V` `V=I/R` `R=I/V` ANSWER :A

Discussion

46.	OH CH_2 CH_2- OH on heating with periodic acid gives ………………………. .
Answer» methanoic ACID GLYOXAL METHANOL `CO_2` SOLUTION :methanol

Discussion

47.	{:(OH), (\|),(CH_(2)-C-CH_(2)-COOH),(""\|\|),(""CH),(""\|),(""CH_(3)):}Total number of carbon atoms in parent carbon chain is :-
Answer» 4 5 6 3 Answer :B

Discussion

48.	Oflaxacin is
Answer» BROAD SPECTRUM bacteriostic antibitoic broad spectrum BACTERICIDAL antibiotic narrow spectrum BACTERIOSTATIC antibiotic narrow spectrum bactericidal antibiotic Answer :B

Discussion

49.	Off the following, the metals that cannot be obtained by electrolysis of the aqueous solution of their salts are (1) Ag (2) Mg (3) Cu and (4) Al
Answer» 1, 2 2, 3 3, 4 2, 4 Answer :D

Discussion

50.	Oflaxacin is a drug used as
Answer» ANALGESICS antipyretics antibiotics b Answer :C

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

OMG is used for the qualitative chemical analysis of

Omega^(-1) m^(-1) is the unit of

Omeprazole and lansopyrazole are _______

Olis are purified by :

Oleum or fuming H_(2)SO_(4) is

Oligosaccharides contain _____ simple sugar units :

Oleum or fuming H_2SO_4 is:

Oleum is pyrosulphuric acid.

Oleum is formed when .............is passed through conc. H_(2)SO_(4).

Oleum is formed when conc. H_2SO_4

Oleum is a mixture of:

Oleum is

Oleum is:H_2S_2O_7,H_2S_2O_6,H_4S_2O_7,H_3S_2O_7.

Oleum is :

Oleic, stearic and palmitie acids are

Oleic, stearic and palmitic acid are:

Olefins are obtained from alcohols by heating with

Olefins can be hydrogenated by

Olefins are converted to paraffins by:

Oils contain a higher percentage of :

Oils are liquids at room temperature since they contain higher percentage of

Oils are converted into fats by

Oils are

Oils and fats are stored by the addition of BHA and BHT because they prevent_______.

Oils are :

Oils and fats are jointly called

Oils and facts in our food not only provide us energy but also act as carriers of certain vitamins such as:

Oils and facts in our food not only provide us energy but also act as carries of certain vitamins such as:

Oil used as frothing agent in froth floatation process is ............

Oil used as frother in froth floatation process

Oil soluble dye is mixed with water - in - oil emulsion then

Oil soluble dye is mixed with emulsion and emulsion remains colourless then it is

Oil soluble dye is mixed with emulsion and emulsion remains colourless then, the emulsion is

Oil of winter green is

Oil of winter green and salol are the esters of :

Oil of vitriol is:

Oil of vitriol is:CuSO_4,H_2SO_4,Al_2(SO_4)_3,Na_2SO_4.

Oil of vitriol is

Oil of mirbane is another name for :

Oil of mirbane is………………

Oil gas is obtained in laboratory by :

Oil abtained from petroleum is called:

Oif 28.0% of a sample of Ag-112 decays in 1.52h, what is the half-life of this isotope?

Ohm's law is mathematically expressed as

OH CH_2 CH_2- OH on heating with periodic acid gives ………………………. .

{:(OH), (|),(CH_(2)-C-CH_(2)-COOH),(""||),(""CH),(""|),(""CH_(3)):}Total number of carbon atoms in parent carbon chain is :-

Oflaxacin is

Off the following, the metals that cannot be obtained by electrolysis of the aqueous solution of their salts are (1) Ag (2) Mg (3) Cu and (4) Al

Oflaxacin is a drug used as