94420 + Interview Questions in Chemistry in Class 12

1.	Chlorination of ethane is carried out in presence of
Answer» ANHYDROUS `AlBr_(3)` mercuric chloride ULTRAVIOLET light zinc chloride Solution :Chlorination of alkane is free radical SUBSTITION reaction, HENCE it is carried out in the presence of ultra violet light.

Discussion

2.	Chlorination of ethane is carried out in the presence of
Answer» ANHYDROUS `AlBr_(3)` MERCURIC chloride ultraviolet light zinc chloride Answer :C

Discussion

3.	Chlorination of ethane in the presence of U.V. light folowed by treatement with aq. NaOH gives.
Answer» sodium ethoxide ethanol ethene metha Solution :`C_(2)H_(6)+Cl_(2)OVERSET(U.V."light") to C_(2) H_(5)CL+HCl` `C_(2)H_(5)+NaOH overset(AQ) to C_(2)H_(5)OH+NaCl`

Discussion

4.	Chlorination of CS_2 gives :
Answer» `C Cl_4` `CS_2Cl_2` `CH_4` `CHCl_3` ANSWER :A

Discussion

5.	Chlorination of CH_4 in sunlight involves
Answer» Homolytic CLEAVAGE Heterolytic cleavage Carbocation carbanion Solution :`CH_4+Cl_2 rarrCH_3Cl+HCL` `CH_4+Cl_2 rarrCH_3Cl+HCl` `Cl_(2)voverset("bv")rarr2Cl""CH_(4)+Cl^(-)rarroverset(.)CH_(3)+HCl` `overset(.)CH_(3)+Cl._(2)rarrCH_(3)Cl+Cl` `Cl.+Cl.rarrCl_(2)`

Discussion

6.	Chlorination of carbon disulphide gives ………
Answer» Methyl CHLORIDE CARBON tetrachloride CHLOROFORM Freon ANSWER :B

Discussion

7.	Chlorination of benzene is not possible in the following reaction
Answer» `C_6H_6+Cl_2 overset(FeCl_3)to` `C_6H_6+HOCl overset(H^+)to` `C_6H_6+I - Cloverset(ZnCl_2)to` `C_6H_6+Cl_2 overset(AlCl_3)to` SOLUTION :REACTION is CALLED Gattermann-Koch synthesis, which is carried by catalyst `AlCl_3`

Discussion

8.	Chlorination of a gas X with chlorine gives a substance Y. Y is used to prepare anhydrous ferric chloride from its hexahydrated salt and also used to convert ethanol to ethylchloride. Identify Y and write necessary equations.
Answer» SOLUTION :`Y=SO_(2)Cl_(2)`

Discussion

9.	Chlorides react with conc. H_2SO_4 and evolve :
Answer» `HCL ` GAS `Cl_2` gas HOCL `ClO_2` gas . ANSWER :A

Discussion

10.	Chloride of which of the following elements will be coloured
Answer» Silver Mercury Zinc Coblat Solution :COBALT DUE to PRESENCE of UNPAIRED `E^(-)`.

Discussion

11.	Chloride ion and potassium ion are isoelectronic Then
Answer» POTASSIUM ion is relatively bigger depends on the other cation and anion their sezes are same chloride ion is bigger than potassium ion. Solution :`Cl^(-) and K^(+)` are isoelectric species having same number of electrons (=18). Greater the nuclear CHARGE of an ion, more will be FORCE of ATTRACTION for same number of electrons. `K^(+)` have greater nuclear charge than `Cl^(-)` so attractive pull exerted by the NUCLEUS is more and the size is smaller in `K^(+)` ion.

Discussion

12.	Chloride are among the following is :
Answer» Malachite Magnesite Magnetite Rock salt Answer :D

Discussion

13.	Chloramphenioclo is used as an
Answer» analgesic anesthetic antibiotic antiseptic Answer :C

Discussion

14.	Chloramphenicol is an:Antifertility drug,Antihistaminic,antiseptic and disinfectant,antibiotic-broad spectrum.
Answer» Antifertilitydrug Antihistaminic antiseptic and disinfectant antibiotic-broad spectrum Answer :D

Discussion

15.	Chloramphenicol is a narrow spectrum antibiotic
Answer» ANSWER :F

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16.	Chloramphenicol is
Answer» BACTERICIDAL antibiotics bacteristatic antibiotics antisptic antimalerial drugs Answer :B

Discussion

17.	Chloramphenicol.
Answer» Solution :CHLORAMPHENICOL is used in TREATING ACUTE FEVER, DYSENTERY, typhoid, meningitis, pneumonia, etc.

Discussion

18.	Chloramophenciol is
Answer» DISINFECTANT antipyretics antiseptics antibiotics ANSWER :D

Discussion

19.	Chloramine-T is a/an
Answer» Disinfectant ANTISEPTIC Analgesic Antipyretic Solution :Antiseptic drugs causes destruction of micro-organism that produce septic disease e.g., Dettol, Savlon acriflavin, BORICACID, Phenol Iodoform, `KMnO_(4)` and some DYES such as Chloramine T, methylene BLUE.

Discussion

20.	Chloramine-T is a:
Answer» Disinfectant Antiseptic Analgesic Antipyretic Answer :B

Discussion

21.	Chloramine-R is a
Answer» disinfectant ANTISEPTIC q analgesic antipyretics SOLUTION :Antiseptics DRUGS cause destruction of micro organism, which produce septic diseases, eg, dettol, savlon acriflavin, boric acid, PHENOL, iodoform, `KMnO_(4)` and some dyes suchas chloramineT methylene blue.

Discussion

22.	Chloral is prepared industrially by the chlorination of:
Answer» Propanone Formaldehyde Ethanol Chloroform Answer :C

Discussion

23.	Chloral is:
Answer» `C Cl_3`CHO `CCl_3. CO. CH_3` `CCl_3. CO. CCl_3` `CCl_3. CH_2OH` ANSWER :A

Discussion

24.	Chloral hydrate is:
Answer» `C Cl_3CH(OH)_2` `CCl_3COCH_3` `CCl_3COCCl_3` `CCl_3CH_2OH` ANSWER :A

Discussion

25.	Chloral belongs to the class of:
Answer» Alcohols Aldehyde Amides Ketones Answer :B

Discussion

26.	CHl_3 overset (HNO_3) (rarr) (X) ltbRgt In the above sequence , (X ) is :
Answer» Nitrochloromethane Chloropicrin Ethanenitrile NONE of the above Solution :` H-C.Cl_3 overset (HNO_3) (RARR) UNDERSET ("Chloropicrin") (O_2-C Cl_3)`.

Discussion

27.	Chirality of carbon compound is because to its
Answer» TETRAHEDRAL NATURE of CARBON Monovalent nature of carbon Divalent nature of carbon Trivalent nature of carbon Solution :CHIRALITY of carbon COMPOUND is because of tetrahedral nature of carbon.

Discussion

28.	Chiral which correct statements(s) is/are
Answer» not super imposable on their mirror IMAGE aresuper imposable on their mirror image show geometrical ISOMERISM show OPTION isomerism Answer :A

Discussion

29.	Chiral molecules are those which :
Answer» are not superimposable on their mirror images are superimposable on their mirror images undergo INTERNAL compensation of their optical ACTIVITY :show GEOMETRICAL isomerism Answer :A

Discussion

30.	Chiral molecules are :
Answer» Superimposable on their MIRRO image Not superimposable on their mirro image unstable molecules capable of SHOWING GEOMETRICAL isomerism Answer :B

Discussion

31.	Chiral molecuels are those which are:
Answer» superimposable on their MIRROR image not superimposable on their mirror image unstable MOLECULES capable of SHOWING GEOMETRICAL isomersim. Answer :B

Discussion

32.	Chinese white is:
Answer» `ZNO` `ZnCO_3` `ZNS` `ZnS+BaSO_4` ANSWER :A

Discussion

33.	Chile saltpetre is the ore of:
Answer» Mg K Na Ca Answer :C

Discussion

34.	Chile salt petre contains sodium iodate upto
Answer» `0.02%` `0.2%` `0.002%` `0.5%` ANSWER :B

Discussion

35.	Chile salt peter a soure of NaNO_(3) also contains NalO_(3). The NalO_(3) can be used as a surece of iodine produced in the following reactions : Step 1 :lO_(3)^(-) + 3HSO_(3)^(-) to l^(-) + 3H^(+) + 3SO_(4)^(2-) Step 2 : 5l^(-) + lO_(3)^(-) + 6H^(+) to 3l_(2) + 3H_(2)O One litre of chile salt peter solution containing amount of same solutionis added to the reaction mixture to bring about the secondreaction . How many grams of NaHSO_(3)are required in step 1 andwhat additional volume of chile peter must be added in step 2 to bring in complete conversion of l^(-) " to " l_(2) ?
Answer» Solution :Meq. of `NaHSO_(3) = " Meq. of " NalO_(3) = N xx V = (5.8)/(198) xx 6 xx 1000 ` `l^(5+) + 6e^(-) to l^(-) "( For " KlO_(3), " n-FACTOR = 6 ")` . ` :. " Meq. Of " NaHSO_(3) = 175.76` `W_(NaHSO_(3))/(M//2) xx 1000 = 175.76` `rArr W_(NaHSO_(3)) = (175.75 xx 104)/(2 xx 1000) = 9.14` gm ALSO , Meq. of `l^(-)` formed using n-factor `6 = 175.76` In step 2, n-factor of `l^(-) ` is 1 andn- factor for `lO_(3)^(-)` is 5 Meq. of `l^(-)`formed using n-factor `1 = (175.76)/6` Meq. of `NalO_(3) " used in " 2^(nd) " step " = (175.76)/6` `rArr(5.8)/(198) xx 5 xx V = (175.76)/6` `V_(NalO_(3)) = 20 ` ml

Discussion

36.	The chief ore of Aluminium is __________
Answer» Bauxite Clay Haematite Magnetite Answer :A

Discussion

37.	Chief ore of Al is :
Answer» Cryolite Alunite Feldspar Bauxite Answer :D

Discussion

38.	Chernobyl tragedy occurred in
Answer» 9th May, 1945 26th APRIL, 1986 6th Aug, 1947 26th May, 1966 Solution :On 26 April , 1986 at the CHERNOBYL power station RELEASED a huge amount of radiaactive cloud into the ATMOSPHERE in which tragedy many people were killed

Discussion

39.	"Chemisorption is highly specific. " Illustrate with an example .
Answer» Solution :As it INVOLVES CHEMICAL BONDING between ADSORBENT and adsorbate .

Discussion

40.	chemisorption..............
Answer» increases with INCREASE in temperature decreases with increase in temperature remains UNAFFECTED by the change of temperature FIRST increases and then decreases. Solution :first increases and then decreases.

Discussion

41.	Chemisorption is :
Answer» MULTIMOLECULAR in nature Reversible Often HIGHLY SPECIFIC and directional Not very specific Answer :C

Discussion

42.	Chemicals which lower the body temperature in high fever are called _______
Answer» ANSWER :ANTIPYRETICS

Discussion

43.	Chemicals which prevent the growth of microorganisims are called _____.
Answer» SOLUTION :ANTISEPTIC

Discussion

44.	Chemicals used for reducing pain are called _______
Answer» ANSWER :ANALGESICS

Discussion

45.	Chemicals compound 'A' is used to remove temporary hardness from water. It reacts with Na_2 CO_3 to generate caustic soda. When CO_2 is bubbled through 'A'. It turns cloudy. What is the chemical formula of 'A' ?
Answer» `CaCO_3` CAO `CA(OH)_2` `Ca(HCO_3)_2` ANSWER :D

Discussion

46.	Chemically zeolites are:
Answer» Aluminosilicate Calcium aluminosilicate Hydrated SODIUM aluminosilicate None of the above Answer :C

Discussion

47.	Chemically what are detergents ?
Answer» SODIUM SALTS of organic sulphonic acid Potassium salts of organic acid Sodium salts of FATTY acid Potassium salts of fatty acid Solution :Sodium salts of organic sulphonic acid

Discussion

48.	Chemically soap is a .................... or .................... salt of higher fatty acids.
Answer» SOLUTION :SODIUM, POTASSIUM

Discussion

49.	Chemically salol is known as -
Answer» ACETYL SALICYLIC acid Sodium SALICYLATE Methyl salicylate PHENYL salicylate Solution :Phenyl salicylate

Discussion

50.	Chemically soap is :
Answer» Base Acid Salt None Answer :C

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Chlorination of ethane is carried out in presence of

Chlorination of ethane is carried out in the presence of

Chlorination of ethane in the presence of U.V. light folowed by treatement with aq. NaOH gives.

Chlorination of CS_2 gives :

Chlorination of CH_4 in sunlight involves

Chlorination of carbon disulphide gives ………

Chlorination of benzene is not possible in the following reaction

Chlorination of a gas X with chlorine gives a substance Y. Y is used to prepare anhydrous ferric chloride from its hexahydrated salt and also used to convert ethanol to ethylchloride. Identify Y and write necessary equations.

Chlorides react with conc. H_2SO_4 and evolve :

Chloride of which of the following elements will be coloured

Chloride ion and potassium ion are isoelectronic Then

Chloride are among the following is :

Chloramphenioclo is used as an

Chloramphenicol is an:Antifertility drug,Antihistaminic,antiseptic and disinfectant,antibiotic-broad spectrum.

Chloramphenicol is a narrow spectrum antibiotic

Chloramphenicol is

Chloramphenicol.

Chloramophenciol is

Chloramine-T is a/an

Chloramine-T is a:

Chloramine-R is a

Chloral is prepared industrially by the chlorination of:

Chloral is:

Chloral hydrate is:

Chloral belongs to the class of:

CHl_3 overset (HNO_3) (rarr) (X) ltbRgt In the above sequence , (X ) is :

Chirality of carbon compound is because to its

Chiral which correct statements(s) is/are

Chiral molecules are those which :

Chiral molecules are :

Chiral molecuels are those which are:

Chinese white is:

Chile saltpetre is the ore of:

Chile salt petre contains sodium iodate upto

The chief ore of Aluminium is __________

Chief ore of Al is :

Chernobyl tragedy occurred in

"Chemisorption is highly specific. " Illustrate with an example .

chemisorption..............

Chemisorption is :

Chemicals which lower the body temperature in high fever are called _______

Chemicals which prevent the growth of microorganisims are called _____.

Chemicals used for reducing pain are called _______

Chemicals compound 'A' is used to remove temporary hardness from water. It reacts with Na_2 CO_3 to generate caustic soda. When CO_2 is bubbled through 'A'. It turns cloudy. What is the chemical formula of 'A' ?

Chemically zeolites are:

Chemically what are detergents ?

Chemically soap is a .................... or .................... salt of higher fatty acids.

Chemically salol is known as -

Chemically soap is :