94420 + Interview Questions in Chemistry in Class 12

1.	Sodium salts of some acids are used as food preservatives. Suggest a few such acids.
Answer» SOLUTION :BENZOIC ACID, sorbic acid and PROPANOIC acid.

Discussion

2.	Sodium salt of long chain allyl benzene sulphonic acids are called ..
Answer» soap DETERGENT disinfectant antiseptic Solution :detergent

Discussion

3.	Sodium salt of which acid is used as food preservative ?
Answer» Phthellic ACID Adipic acid Formic acid BENZOIC acid Answer :D

Discussion

4.	Sodium salt of benzene sulphonic acid on fusion with caustic soda gives:
Answer» `C_6H_5OH` `C_6H_6` `C_6H_5COOH` None Answer :A

Discussion

5.	Sodium salt of formic acid on strong heating followed by acid hydrolysis yields:
Answer» HCHO HCOOH COOH-COOH `CH_3CHO` ANSWER :C

Discussion

6.	Sodium salt of benzene sulphonic acid on fusion with caustic soda followed by acidification gives
Answer» Benzene Phenol Thiophenol Benzenesulfonic acid Answer :B

Discussion

7.	Sodium salt of benzene sulphonic acid on fusion with caustic soda and followed by treatment with HCI gives
Answer» ACETIC acid cumene phenol picric acid Answer :C

Discussion

8.	Sodium salt of an organic acid 'X' produces effervescence with conc. H_2SO_4. 'X' reacts with the acidified aqueous CaCl_2 solution to give a white precipitate which decolourises acidic solution of KMnO_4. 'X' is :
Answer» `C_6H_5COONa` HCOONA `CH_3COONa` `Na_2C_2H_4` SOLUTION :

Discussion

9.	Sodium salt of an organic acid 'X' produces effervescence with conc. H_2SO_4 . 'X' reacts with the acidified aqueous CaCl_2 solution to give a white precipitate which decolourises acidic solution of KMnO_4.'X' is -
Answer» HCOONA `CH_3COONa` `Na_2C_2O_4` `C_6H_5COONa` ANSWER :C

Discussion

10.	Sodium salt of alpha-halo carboxylic acid is heated with sodium nitrite and followed by hydrolysis gives
Answer» AMIDES nitroparaffins AMINES ALCHOLS ANSWER :B

Discussion

11.	Sodium saltof aci- formof nitroalkanewhentreatedwith 50% H_(2)SO_(4) gives- CHO orgt C=O compounds. Thisisknown as
Answer» NEF CARBONYL SYNTHESIS Sandmeyersynthesis Balz sysnthsis Gattermannsysthesis ANSWER :A

Discussion

12.	Sodiumsaltof acidformof ethyl methylnitromicacids is treatedwith 50%H_(2)SO_(4) gives
Answer» `CH_(3) - CH_(2) - CH_(2) - COOH` `CH_(3) - CO - CH_(2)- CH_(3)` `CH_(3) - CO -CH_(3)` `CH_(3) - CH_(2)- CHO` Answer :B

Discussion

13.	Sodium rosinate is generally added in the soap because it :
Answer» Prevents RAPID drying of SOAP PRODUCES rich lather Gives ANTISEPTIC property Acts as a perfume. Answer :B

Discussion

14.	Sodium reacts with water less vigorously thann potassium because:
Answer» It has HIGHER ATOMIC weight It is LESS electropositive It is more electronegative It is a metal Answer :B

Discussion

15.	Sodium reacts with alcohol as given below 2R-OH + 2Na to 2R - O Na + H_2Place the type of alcohol into decreasing order of reactivity towards sodium.
Answer» `3^@gt 2^@ gt 1^@` `1^@gt 3^@ gt 2^@` `2^@gt 3^@ gt 1^@` `1^@gt 2^@ gt 3^@` Solution :Reactivity of ALCOHOL toward sodium depends upon the ACIDIC NATURE of the alcohol. More the acidic nature of alcohol, the faster is the reaction between alcohol and sodium.The electron RELEASING alkyl groups decrease the acidic nature of alcohol. DECREASING order of acidity of alcohol is `CH_3OH gt 1^@ gt 2^@ gt 3^@` . The same is the order of reactivity towards sodium metal.

Discussion

16.	Sodium reacts with alcohol as given below 2Na+ 2ROH rarrH_2+2[Na^(+) bar(O)R] place the types of alcohol into decreasing order of reactivity towards Na
Answer» `1^@ GT 2^@ gt 3^@` `1^@ gt 3^@ gt 2^@` `2^@ gt 3^@ gt 1^@` `3^@ gt 2^@ gt 1^@` ANSWER :A

Discussion

17.	Sodium phenoxide reacts with CO_2 at 400 K and 4 - 7bar pressure to give …………………. .
Answer» SODIUM SALICYLATE Salicylaldehyde Cate CHOL PYROGALLOL SOLUTION :Sodium salicylate

Discussion

18.	Sodium potassium citrate is one of the components of the following reagent :
Answer» Fehling.s SOLUTION Tollen.s REAGENT Benedict.s solution Baeyer.s reagent ANSWER :C

Discussion

19.	Sodium phthalamide overset(Br_(2).KOH)toXoverset(H_(3)O^(+))toYThe product Y is :
Answer» ANTHRANILIC acid o- PHENYLENE diamine terephthalic acid adipic acid Solution :

Discussion

20.	Sodium phenoxide on reaction with methyl iodide produces compound X, which on Friedel-Craft's acylation produces compounds Y and Z. Mention compounds X, Y and Z.
Answer» X= Methoxy Benzene, Y = 0-methoxy TOLUENE, Z = p-methoxy toluene X = Methoxy Benzene, Y=o-chloro anisole, Z= p-chloro anisole X = Anisole, Y= 1(2-methoxy phenyl) ethan 1 - one, Z=1(4-methoxy phenyl) ethan - 1 - one X = Anisole, Y= o - NITRO Anisole, Z= p-nitro anisole Solution :X = Anisole, Y= 1(2-methoxy phenyl) ethan 1 - one, Z=1(4-methoxy phenyl) ethan - 1 - one

Discussion

21.	Sodium pheoxide reacts with CO_(2) at 400K and 4-7 atm pressure to give
Answer» SODIUM SALICYLATE salicyladehyde catechol BENZOIC acid Answer :A

Discussion

22.	Sodium phenoxide is reacted with ethyl chloride gives
Answer» o-ethyl SODIUM phenoxide p-ethyl sodium phenoxide ethoxy benzene m-ethyl sodium phenoxide Answer :C

Discussion

23.	Sodium oxalate on heating with conc. H_(2)SO_(4) gives
Answer» CO only `CO_(2)` only CO and `CO_(2)` `SO_(2)` and `SO_(3)` SOLUTION :Sodium OXALATE react with conc. `H_(2)SO_(4)` to form CO and `CO_(2)` GAS.

Discussion

24.	Sodium palmitate is a major constituent in soap. When an aqueous solution of sodium palmitate having 1 kg of solvent is analysed for its boiling point, following data is obtained. Identify the option(s) which is/are correct.
Answer» Aqueous mixture of SODIUM palmitate having concentration EQUAL to 0.07 M will be heterogeneous. The CMC value of sodium palmitate should be LESS than 0.06M. Osmotic pressure at 0.08 M at 300 K will be 1.9704 atm. At 0.4 M concentration, the SOLUTION is homogeneous. Answer :A::B

Discussion

25.	Sodium peroxide in contact with moist air turns white due to the formation of:
Answer» `Na_2O` `Na_2CO_3` `NaHCO_3` NaOH Answer :D

Discussion

26.	Sodium nitroprusside when added to an alkanie solution of sulphide ions produces purple colourations due to the formation of
Answer» `Na[FE(H_(2)O)_(5)NOS]` `Na_(4)[(CN)_(5)NOS]` `Na_(3)[(CN)_(5)NOS]` `[Cr(NH_(3))_(6)CI_(6)` Solution :(b) `Na_(2)S+Na_(2)[Fe(CN)_(5)NOrarrNH_(4)[Fe(CN)_(5)NOS]`

Discussion

27.	Sodium or potassium salts of higher fatty acids are called
Answer» SOAPS Terpenes Sugars Alkaloids Solution :Soaps are the sodium or POTASSIUM salts of higher FATTY ACIDS.

Discussion

28.	Sodium nitroprusside, when added to an alkaline solution of sulphide ions, produces purple colour ion due to the formation off
Answer» `NA[Fe(H_(2)O)_(5)NOS]` `Na_(2)[H_(2)O)_(5)NOS]` `Na_(3)[Fe(CN)_(5)NOS]` `Na_(4)[Fe(CN)_(5)NOS]` Solution :`Na_(4)[Fe(CN)_(5)NO]+S^(2-)to UNDERSET("Sodium thio-nitroprusside (VIOLET)")(Na_(4)[Fe(CN)_(5)NOS])`

Discussion

29.	Sodium nitroprusside, when added to an alkaline solution of sulphide ions, produces purple colour ion due to the formation of
Answer» `NA[Fe(H_(2)O)_(5)NOS]` `Na_(2)[Fe(H_(2)O)_(5)NOS]` `Na_(3)[Fe(CN)_(5)NOS]` `Na_(4)[Fe(CN)_(5)NOS]` Solution :`Na_(4)[Fe(CN)_(5)NO]+S^(2-)rarr Na_(4)[Fe(CN)_(5)NOS]` Sodium thio-nitroprusside (violet)]

Discussion

30.	Sodium nitroprusside whenadded to an alkaline solution ions produces a colouration which is :
Answer» red BLUE brown purple Solution :`NH_(4)[Fe(CN)_(5)NO_(5)]` blue

Discussion

31.	Sodiumnitroprusside reacts with sulphide ion give a purple colour due to the formation of
Answer» `[Fe(CN)_(5)NO]^(3-)` `[Fe(NO)_(5)CN]^(-)` `[Fe(CN)_(5)NOS]^(4-)` `[Fe(CN)_(5)NOS]^(3-)` Solution :`underset("Sodium nitroprusside")([Fe(CN)_(5)NO]^(2-))+S^(2-)rarrunderset("PURPLE COMPLEX")([Fe(CN)_(5)NOS]^(4-))`

Discussion

32.	Sodium nitroprusside test is used to distinguish between
Answer» alcohols and phenols aldehydes and ketones formic ACID and other carboxylic acids `1^@ , 2^@` and `3^@` amines. SOLUTION :Sodium nitroprusside test is used to DISTINGUISH between aldehydes and ketones . Alkaline solution of ketone react with nitroprusside to form coloured ion. `CH_(3) underset("(Acetone)") (COCH_(3)) + OH^(-) to CH_(3) COCH_(2) + H_(2)O` `underset("Nitroprusside ion")([Fe(CN)_(5) NO]^(2-)) + CH_3 COCH_(2)^(-) to [Fe (CN)_(5) underset("(red coloured)")(NO * CH_(3) CO) CH_(2)]^(3-)` Aldehydes do not show this reaction .

Discussion

33.	Sodium nitrophrusside when added to an alkaline solution of sulphide ions produce as
Answer» RED colouration Blue colouration Purple colouration Brown colouration Solution :`Na_(2)S+underset("SODIUM nitroprusside")(Na_(2)[Fe(NO)(CN)_(5)])to underset("Violet coloured complex")(Na_(3)[Fe(ONSNa)(CN)_(5)])` or `underset("Purple colour complex")(Na_(4)[Fe(CN)_(5)NOS])`

Discussion

34.	Sodium nitroprusside Na_(2)[Fe(CN)_(5)NO] is used as a reagent for the detection of
Answer» sulphur nitrogen BROMINE iodine. Answer :A

Discussion

35.	Sodium nitrate decomposes above 800^@C to give
Answer» `N_2` `O_2` `NO_2` `Na_2O` ANSWER :B

Discussion

36.	Sodium nitrate used in …………….. .
Answer» Photography FIREARMS Royal water Cryosurgery Solution :Firearms

Discussion

37.	Sodium nitrate on reduction with Zn in presence of NaOH solution produces NH_(3). Mass of sodium nitrate nitrate absorbing 1 mole of electron will be
Answer» `7.750` `10.625` `8.000` `9.875` Solution :AMMONIA is formed by reduction of nitrates and nitrites with Zn and NaOH. Zn and caustic soda produce nascent hydrogen which reacts with nitrates to FORM ammonia. `NaNO_(3)+8H^(+)+8e OVERSET(Zn//NaOH)(RARR) NaOH+NH_(3)+2 H_(2)O` From the equation Mass of `NaNO_(3)` absorbing 8 moles of electron `=85 g` `:.` Mass of `NaNO_(3)` absorbing 1 mole of electron `=85/8=10.625 g`.

Discussion

38.	Sodium nitrate on heating with zinc dust and caustic soda gives
Answer» `NaNO_2` `NH_3` `NO_2` `N_2O` ANSWER :B

Discussion

39.	Sodium metal reacts readily with
Answer» R-CHO `R-CH_2OH` ESTER `R-NH_2` ANSWER :B

Discussion

40.	Sodium metal is soft but Iron is a hard metal. This difference arises due to.
Answer» Sodium has lesser atomic MASS than IRON Sodium has only ONE valence ELECTRON where as iron has more There is one unpaired electron is sodium but four unpired electrons in iron Sodium reacts readily with air and moisture but iron is resistanct to action of water ANSWER :C

Discussion

41.	Sodium metal is obtained by:
Answer» The ELECTROLYSIS of concentrated NaCl (AQ) HEATING `Na_2O` with `H_2` Heating FUSED sodium chloride Electrolysis of fused sodium chloride Answer :D

Discussion

42.	Sodium metal is extracted by
Answer» Electrolysis of AQUEOUS SOLUTION of sodium chloride Electrolysis of fused sodium chloride Heating sodium oxide with carbon Heating sodium oxide with hydrogen Answer :B

Discussion

43.	Sodium metal exists in bcc unit cell. The distance between nearest sodium atoms is 0.368 nm. The edge length of unit cell is .........
Answer» 0.368 nm 0.184 nm 0.425 nm 0.575 nm Solution :In bcc structure, the closest DISTANCE (d) between two ATOMS `= (sqrt(3)a)/2` `THEREFORE` distance `(d) = 0.368 = (sqrt(3)a)/(2)` `IMPLIES a = 0.425`.

Discussion

44.	Sodium metal in liquid ammonia is
Answer» an IONIC CONDUCTOR an ELECTRONIC conductor a MIXED conductor NON - conductor

Discussion

45.	Sodium metal crystallizes in bcc structure with the edge length of the unit cell 4.3 xx 10^(-8) cm. Calculate the radius of sodium atom.
Answer» Solution :Edge length of theunit CELL `(a)=4.3xx10^(-8)`cm Radius of SODIUM atom (r) `=?` For bcc structure, `r=sqrt(3)/4 a` `=(sqrt(3))/(4)(4.3xx10^(-8)cm)` `=(1.732xx4.3xx10^(-8))/(4)` `=(7.4476)/(4)xx10^(-8)`cm `=1.86xx10^(-8)cm=1.86 Å`

Discussion

46.	Sodium metal crystallizes in bee structure with the edge length of the unit cell 4.3 xx10^(-) cm. Caleulate the radius of sodium atom.
Answer» SOLUTION :`"Edge LENGTH of the UNIT cell (a)"=4.3xx10^(-8)CM` `"Radius of sodium atom (r )"=?` `"for bcc structure, r"=(sqrt3)/(4)a` `=(sqrt3)/(4)(4.3xx10^(-8)cm)` `=(1.732xx4.3xx10^(-8))/(4)` `=(7.4476)/(4)xx10^(-8)cm` `=1.86xx10^(-8)cm=1.86Å`

Discussion

47.	Sodium metal crystallizes in B.C.C. lattice with edge length of 4.29A^(@). The radius of sodium atom is
Answer» `2.857 A^(@)` `1.601 A^(@)` `2.145 A^(@)` `1.857 A^(@)` ANSWER :D

Discussion

48.	Sodium metal crystallizers in B.C.C. lattice with edge length of 4.29 A^o. The radius of sodium atom is
Answer» `2.145 Å` `2.857Å` `1.857Å` `1.601Å` SOLUTION :EDGE length `a = 4.29Å` For B.C.C. lattice `R = ( SQRT( 3) a )/( 4) = ( sqrt( 3))/( 4) xx 4.29` `= 1.857 Å`

Discussion

49.	Sodium metal crystallizes in a body-centred cubic lattice with a unit cell edge of 4.29 A^@. The radius of sodium atom is approximately…...
Answer» `5.72 A^@` `0.93 A^@` `1.86 A^@` `3.22 A^@` Solution :For bcc structure `R = (SQRT3)/4 a` `r = (sqrt3)/(4) XX 4.29` `r = 1.86 A^@`.

Discussion

50.	Sodium metal crystallizes in a body centred cubic lattice with a unit cell edge of 4.29Å. The radius of sodium atom is approximately :
Answer» `1.86Å` `3.22Å` `5.72Å` `0.93Å` Solution :For body CENTRED cubic LATTICE, Radius, `R = ( SQRT( 3))/( 4) a ` `a = 4.29 Å` `:. r = ( 1.732)/( 4) xx 4.29 = 1.86 Å`

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Sodium salts of some acids are used as food preservatives. Suggest a few such acids.

Sodium salt of long chain allyl benzene sulphonic acids are called ..

Sodium salt of which acid is used as food preservative ?

Sodium salt of benzene sulphonic acid on fusion with caustic soda gives:

Sodium salt of formic acid on strong heating followed by acid hydrolysis yields:

Sodium salt of benzene sulphonic acid on fusion with caustic soda followed by acidification gives

Sodium salt of benzene sulphonic acid on fusion with caustic soda and followed by treatment with HCI gives

Sodium salt of an organic acid 'X' produces effervescence with conc. H_2SO_4. 'X' reacts with the acidified aqueous CaCl_2 solution to give a white precipitate which decolourises acidic solution of KMnO_4. 'X' is :

Sodium salt of an organic acid 'X' produces effervescence with conc. H_2SO_4 . 'X' reacts with the acidified aqueous CaCl_2 solution to give a white precipitate which decolourises acidic solution of KMnO_4.'X' is -

Sodium salt of alpha-halo carboxylic acid is heated with sodium nitrite and followed by hydrolysis gives

Sodium saltof aci- formof nitroalkanewhentreatedwith 50% H_(2)SO_(4) gives- CHO orgt C=O compounds. Thisisknown as

Sodiumsaltof acidformof ethyl methylnitromicacids is treatedwith 50%H_(2)SO_(4) gives

Sodium rosinate is generally added in the soap because it :

Sodium reacts with water less vigorously thann potassium because:

Sodium reacts with alcohol as given below 2R-OH + 2Na to 2R - O Na + H_2Place the type of alcohol into decreasing order of reactivity towards sodium.

Sodium reacts with alcohol as given below 2Na+ 2ROH rarrH_2+2[Na^(+) bar(O)R] place the types of alcohol into decreasing order of reactivity towards Na

Sodium phenoxide reacts with CO_2 at 400 K and 4 - 7bar pressure to give …………………. .

Sodium potassium citrate is one of the components of the following reagent :

Sodium phthalamide overset(Br_(2).KOH)toXoverset(H_(3)O^(+))toYThe product Y is :

Sodium phenoxide on reaction with methyl iodide produces compound X, which on Friedel-Craft's acylation produces compounds Y and Z. Mention compounds X, Y and Z.

Sodium pheoxide reacts with CO_(2) at 400K and 4-7 atm pressure to give

Sodium phenoxide is reacted with ethyl chloride gives

Sodium oxalate on heating with conc. H_(2)SO_(4) gives

Sodium palmitate is a major constituent in soap. When an aqueous solution of sodium palmitate having 1 kg of solvent is analysed for its boiling point, following data is obtained. Identify the option(s) which is/are correct.

Sodium peroxide in contact with moist air turns white due to the formation of:

Sodium nitroprusside when added to an alkanie solution of sulphide ions produces purple colourations due to the formation of

Sodium or potassium salts of higher fatty acids are called

Sodium nitroprusside, when added to an alkaline solution of sulphide ions, produces purple colour ion due to the formation off

Sodium nitroprusside, when added to an alkaline solution of sulphide ions, produces purple colour ion due to the formation of

Sodium nitroprusside whenadded to an alkaline solution ions produces a colouration which is :

Sodiumnitroprusside reacts with sulphide ion give a purple colour due to the formation of

Sodium nitroprusside test is used to distinguish between

Sodium nitrophrusside when added to an alkaline solution of sulphide ions produce as

Sodium nitroprusside Na_(2)[Fe(CN)_(5)NO] is used as a reagent for the detection of

Sodium nitrate decomposes above 800^@C to give

Sodium nitrate used in …………….. .

Sodium nitrate on reduction with Zn in presence of NaOH solution produces NH_(3). Mass of sodium nitrate nitrate absorbing 1 mole of electron will be

Sodium nitrate on heating with zinc dust and caustic soda gives

Sodium metal reacts readily with

Sodium metal is soft but Iron is a hard metal. This difference arises due to.

Sodium metal is obtained by:

Sodium metal is extracted by

Sodium metal exists in bcc unit cell. The distance between nearest sodium atoms is 0.368 nm. The edge length of unit cell is .........

Sodium metal in liquid ammonia is

Sodium metal crystallizes in bcc structure with the edge length of the unit cell 4.3 xx 10^(-8) cm. Calculate the radius of sodium atom.

Sodium metal crystallizes in bee structure with the edge length of the unit cell 4.3 xx10^(-) cm. Caleulate the radius of sodium atom.

Sodium metal crystallizes in B.C.C. lattice with edge length of 4.29A^(@). The radius of sodium atom is

Sodium metal crystallizers in B.C.C. lattice with edge length of 4.29 A^o. The radius of sodium atom is

Sodium metal crystallizes in a body-centred cubic lattice with a unit cell edge of 4.29 A^@. The radius of sodium atom is approximately…...

Sodium metal crystallizes in a body centred cubic lattice with a unit cell edge of 4.29Å. The radius of sodium atom is approximately :