94420 + Interview Questions in Chemistry in Class 12

1.	Hydroxylation of propyne in the presence of HgSO_4//H_2SO_4 is initiated by the attack of :
Answer» Carbene Free radical Electrophile Nucleophile Answer :C

Discussion

2.	Hydroxylamine reacts with
Answer» `CH_(3)COCl` `CH_(3)COCH_(3)` `CH_(3)COOC_(2)H_(5)` `CH_(3)CONH_(2)` SOLUTION :`CH_(3)CONH_(2)` does not react with `NH_(2)OH`.

Discussion

3.	Hydroxylamine condenseswith benzaldehyde to give
Answer» PHCH=NOH `PhCONH_(2)` Phc=NHOH `PhCH_(2)CH=NOH` ANSWER :A

Discussion

4.	Hydroxy derivatives of aromatic compound are called _____.
Answer» ANSWER :ACIDIC,PHENOLS.

Discussion

5.	Hydroxyl ion concentartion of 1 M HCI is
Answer» `1 xx 10^(1) mol` `dm^(-3)` `1 xx 10^(-13) mol` `dm^(-3)` `1 xx 10^(-1) mol` `dm^(-3)` `1 xx 10^(-14) mol` `dm^(-3)` Solution :1 M HCI, CONC. Of `H^(+) = 1 "mol"/dm^(3)` Now `K_(w) = [H^(+)][OH^(-)]` i.e `10^(-14) = 1 xx [OH^(-)]` `THEREFORE [OH^(-)] = 1 xx 10^(-14)` mol/`dm^(3)`

Discussion

6.	Hydroxyl amine (NH_(2)OH
Answer» Solution :Action of HYDROXYL amine: Glucose reacts with hydroxyl amine in aqueous solution to form glucose OXIME. This indicates the PRESENCE of CHO group in glucose. `underset("Glucose")underset(CH_(2)OH)underset(\|)overset(CHO)overset(\|)((CHOH)_(4)) underset("hydroxyl amine")overset(NH_(2)-OH)tounderset("Glucose oxime")underset(CH_(2)OH)underset(\|)overset(CH=NOH)overset(\|)((CHOH)_(4)) `

Discussion

7.	Hydroxide soluble in ammonia is
Answer» `Al(OH)_(3)` `Fe(OH)_(3)` `Cr(OH)_(3)` `Cu(OH)_(2)` Solution :Due to FORMATION of complex `Cu(OH)_(2)+4NH_(3)rarr[Cu(NH_(3))_(4)](OH)_(2)`

Discussion

8.	Hydroxide ion in the following reaction behaves as a/an
Answer» Catalyst Electrophile Nucleophile Reducing agent Answer :C

Discussion

9.	Hydrophobic sol is easily coagulated. Give reason.
Answer» SOLUTION :HYDROPHOBIC sols are not stable because they do not undergo hydration. HENCE, they are easily COAGULATED by addition of a SMALL amount of electrolyte, heating or by shaking.

Discussion

10.	Hydrometallurgy method is used for the extraction of which of the following metals?
Answer» ZN and Ag Ag and CU Zn and Hg Hg and Cu Answer :B

Discussion

11.	Hydrometallurgy is useful in the extraction of:
Answer» Sn Al Hg Ag Answer :D

Discussion

12.	Hydrometallurgy is useful in the extraction of
Answer» Sn Fe Hg Ag Answer :D

Discussion

13.	Hydrometallurgy is a technique used
Answer» for extracting silver from AQUEOUS SOLUTIONS for extracting SODIUM from aqueous solutions for extracting silver from its FUSED SALT for extracting sodium from its fused salt Answer :A

Discussion

14.	Hydrometallurgy.
Answer» Solution :It is a process of extraction of metals by converting their ores into aqueous SOLUTIONS of METAL COMPOUNDS and REDUCING then by suitable reducing AGENTS.

Discussion

15.	Hydrolytic reaction of fats with is an ester
Answer» Esterification Saponification Acetylation CARBOXYLATION ANSWER :D

Discussion

16.	Hydrolytic reaction of fats, with causticsoda, is known as
Answer» Acetylation Carboxylation SAPONIFICATION Esterification Solution :Oil/fat + ALKALI `OVERSET("Saponification")to` Soap+glycerol.

Discussion

17.	Hydrolytic reaction of fats with caustic soda is known as
Answer» Esterification Saponification Acetylation Carboxylation Answer :B

Discussion

18.	Hydrolytic reaction of fats with caustic soda is known as____.
Answer» carboxylation acetylation saponification esterification Answer :C

Discussion

19.	Hydrolysis products of maltose are :
Answer» GLUCOSE and glucose Glucose and SUCROSE Glucose and GALACTOSE NONE of these Answer :A

Discussion

20.	Hydrolysis products of lactose are
Answer» GLUCOSE and glucose glucose and fructose glucose and GALACTOSE NONE of these ANSWER :C

Discussion

21.	Hydrolysis of which saccharide does not give aldose or ketose ?
Answer» Disaccharide MONOSACCHARIDE Polysaccharide OLIGOSACCHARIDE SOLUTION :Monosaccharide

Discussion

22.	Hydrolysis of ______yields acids.
Answer» cyanides amides esters All the above ANSWER :D

Discussion

23.	Hydrolysis of XeF_2 gives
Answer» XE and `O_2` only Xe, HF and `O_2` `O_2` only `XeF_6` and `O_2` only Answer :B

Discussion

24.	Hydrolysis of which of the following compound liberates acidic gas?
Answer» `Li_(2)NH` `Al_(2)S_(3)` `CaC_(2)` `CaNCN` Solution :`Al_(2)S_(3)` on hydrolysis GIVES `H_(2)S` GAS which is acidic.

Discussion

25.	Hydrolysis of urea is an examples of
Answer» HOMOGENOUS catalyst Heterogenous catalyst biochemical catalyst zeolite catalyst Solution :Hydrolysis of urea can be REPRESENTED as FOLLOWS Since it involves BIOLOGICAL catalyst (ENZYME) so it is an example of biochemical catalysis.

Discussion

26.	Hydrolysis of urea is an example of
Answer» HOMOGENOUS catalysis heterogenous catalysis biochemical catalysis zeolite catalysis Solution :Hydrolysis of urea can be represented as follows `H_(2)N-underset(O)(C)-NH_(2)+H_(2)Ounderset(enzyme)overset(UREASE)to2NH_(3)+CO_(2)` Since it involves BIO"log"ical catalyst (enzyme) so it is an example of biochemical catalysis.

Discussion

27.	Hydrolysis of the salt of a strong acid and weak base will
Answer» Increase with increase in temperature Decrease with increase in temperature REMAINS unaffected with CHANGE in temperature Remains uneffected with change in concentration of the SALT ANSWER :A

Discussion

28.	Hydrolysis of the monomers of polyacrylonitrile gives
Answer» Propanamine ETHANOIC acid BUTANAMINE Propanoic acids ANSWER :D

Discussion

29.	Hydrolysis of sugar is called :
Answer» MUTAROTATION SAPONIFICATION inversion deesterification. ANSWER :C

Discussion

30.	Hydrolysis of sucrose with dilute aqueous sulphuric acid yields
Answer» 1:1 (D) (+)-GLUCOSE,D-(-)-fructose 1:2(D) (+)-Glucose,D-(-)-fructose 1:1(D) (-)-Glucose,D-(+)-fructose 1:2(D) (-)-Glucose,D-(+)-fructose Answer :A

Discussion

31.	Hydrolysis of sucrose is called
Answer» hydration saponification esterification INVERSION Solution : Since sucrose is dextrorotatory while hydrolysis PRODUCT of sucrose, having equimolar MIXTURE of glucose and fructose, is laevorotatory. HENCE the hydrolysed product of sucrose is known as invert SUGAR and the hydrolysis of sucrose is known as inversion.

Discussion

32.	Hydrolysis of sucrose gives glucose.TRUE/FALSE
Answer» Answer :Hydrolysis of sucrose GIVES INVERT SUGAR (equal mixture) of GLUCOSE and FRUCTOSE

Discussion

33.	Hydrolysis of sucrose gives ……………………..
Answer» GLUCOSE and FRUCTOSE GALACTOSE and maltose Galactose and glucose NONE of these SOLUTION :Glucose and fructose

Discussion

34.	Hydrolysis of sucrose (C_12H_22O_11) by invertase give :
Answer» Gluose Fructose Both (a) and (B) None Answer :C

Discussion

35.	Hydrolysis of proteins give
Answer» `alpha`-amino ACID only `beta`-amino acids only `gamma`-amino acids only mixture of all i.e. `alpha , beta` and `gamma`-amino acids Solution :Only `alpha`-amino acid are obtained on HYDROLYSIS of PROTEIN.

Discussion

36.	Hydrolysis of protein in the stomach and interstine takes place due to presence of the enzymes
Answer» TRYPSIN and pepsin RESPECTIVELY pepsin and trypsin respectively trypsin in both cases pepsin in both cases SOLUTION :Pepsin in STOMACH and trypsin in intestine.

Discussion

37.	Hydrolysis of prop-1- yne in the presence of HgSO_4and H_2SO_4gives .............
Answer» `CH_3 - undersetoverset(\|\|)(O)(C ) - CH_3` `CH_3CHO` `CH_3CH_2CHO` `HCHO` SOLUTION :`CH_3 - undersetoverset(\|\|)(O)(C ) - CH_3`

Discussion

38.	Hydrolysis of protein in stomach and in intestine takes place due to action of enzyme.
Answer» PEPSIN in STOMACH, TRYPSIN in intestine Trypsin in stomach, pepsin in intestine Both (a) and (B) None Answer :A

Discussion

39.	Hydrolysis of phenyl isocyanide forms
Answer» BENZOIC acid FORMIC acid Acetic acid None of these Solution :HYDROLYSIS of phenyl ISOCYANIDE forms formic acid.

Discussion

40.	Hydrolysis of phenyl isocyanide forms :
Answer» BENZOIC ACID FORMIC acid acetanilide acetic acid ANSWER :B

Discussion

41.	Hydrolysis of PCI_5 gives
Answer» `H_(3)PO_(3)` `H_(3)PO_(4)` `HPO_(3)` `PH_(3)` ANSWER :B

Discussion

42.	Hydrolysis of oxide ion in water produces
Answer» `H^+` `OH^-` `O_2` `H_2O` ANSWER :B

Discussion

43.	Hydrolysis of one mole of peroxidisulphuric acid produces
Answer» TWO moles of sulphuric ACID Two moles of peroxomonosulphuric acid One mole of sulphuric acid and one mole of peroxomonosulphuric acid One mole of sulphuric acid, one mole of hydrogen PEROXIDE. Solution :`underset("Peroxidisulphuric acid")(HO-overset(O)overset(\|\|)underset(O)underset(\|\|)(S)-O-O-overset(O)overset(\|\|)underset(O)underset(\|\|)(S)-OH) +H_(2)O to underset("Peroxomonosulphuric acid")(HO -overset(O)overset(\|\|)underset(O)underset(\|\|)(S)-O-OH)+ underset("Sulphuric acid")(HO-overset(O)overset(\|\|)underset(O)underset(\|\|)(S)-OH)`

Discussion

44.	Hydrolysis of one mole of peroxodisulphuric acid produces :
Answer» two MOLES of SULPHURIC ACID two moles of peroxomonosulphuric aicd one mole of sulphuric acid and one mole of peroxomonosulphuric acid one mole of sulphuric acid, one mole of peroxomono sulphuric acid and one mole of hydrogen peroxide. Solution :`H_(2)S_(2)O_(8)+H_(2)Orarr H_(2)SO_(4)+H_(2)SO_(5)`

Discussion

45.	Hydrolysis of oils and fats gives glycerol and long chain fatty acids containing:
Answer» Even NUMBER of carbon ATOMS Odd number of carbon atoms Both (a) and (B) None Answer :C

Discussion

46.	Hydrolysis of NCl_(3) indicates
Answer» `N^(-)-CI^(+)` POLARITY `N^(+) -CI^(-)` polarity `N^(-)-CI^(-)`polarity `N^(+)-CI^(+)`polarity Answer :A

Discussion

47.	Hydrolysis of nitriles with alkaline solution gives
Answer» SLAT of ACID AMIDES acid ESTERS ANSWER :A

Discussion

48.	Hydrolysis of NCl_(3) gives NH_(3) and X. Which of the following is X.
Answer» `HClO_(4)` `HClO_(3)` `HOCL` `HClO_(2)` ANSWER :C

Discussion

49.	Hydrolysis of methyl acetate in aqueous solution has been studied by titrating the liberated acetic acid against sodium hydroxide. The concentration of an ester at different temperatures is given below. {:("t (min)",0,20,40,60,prop),("v (mL)",20.2,25.6,29.5,32.8,50.4):} Show that the reaction is the first order reactions.
Answer» Solution :`k=(2.303)/(t)"log"((V_(OO)-V_(0)))/((V_(oo)-V_(0)))` `V_(oo)-V_(0)=50.4-20.2=30.2` When t = 20 MTS. `k=(2.303)/(20)"log"(50.4-20.2)/(50.4-25.6)` `=0.1151"log"^(30.2)/(24.8)` `= 0.1151 log 1.2479` `= 0.1151xx0.0959` ` = 11.03xx10^(-3)"MIN"^(-1)` When t = 40 mts `k=(2.303)/(40)"log"(50.4-20.2)/(50.4-29.5)` `=0.0576xx "log"(30.2)/(20.9)` `= 0.0576xx0.1596` `= 9.19xx10^(-3)"min"^(-1)` When t = 60 mts `k=(2.303)/(60)"log"(50.4-20.2)/(50.4-32.8)` `= 0.03838xx "log"(30.2)/(17.6)` `=0.03838xx0.2343` `= 8.99xx10^(-3)"min"^(-1)` The constant values of k show that the REACTION is of first order.

Discussion

50.	Hydrolysis of methyl cyanide gives :
Answer» FORMIC acid Acetic acid Acetaldehyde Formaldehyde. Solution :`CH_(3)CNoverset(H_(2)O)tounderset("Acetic acid")(CH_(3)COOH)`

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Hydroxylation of propyne in the presence of HgSO_4//H_2SO_4 is initiated by the attack of :

Hydroxylamine reacts with

Hydroxylamine condenseswith benzaldehyde to give

Hydroxy derivatives of aromatic compound are called _____.

Hydroxyl ion concentartion of 1 M HCI is

Hydroxyl amine (NH_(2)OH

Hydroxide soluble in ammonia is

Hydroxide ion in the following reaction behaves as a/an

Hydrophobic sol is easily coagulated. Give reason.

Hydrometallurgy method is used for the extraction of which of the following metals?

Hydrometallurgy is useful in the extraction of:

Hydrometallurgy is useful in the extraction of

Hydrometallurgy is a technique used

Hydrometallurgy.

Hydrolytic reaction of fats with is an ester

Hydrolytic reaction of fats, with causticsoda, is known as

Hydrolytic reaction of fats with caustic soda is known as

Hydrolytic reaction of fats with caustic soda is known as____.

Hydrolysis products of maltose are :

Hydrolysis products of lactose are

Hydrolysis of which saccharide does not give aldose or ketose ?

Hydrolysis of ______yields acids.

Hydrolysis of XeF_2 gives

Hydrolysis of which of the following compound liberates acidic gas?

Hydrolysis of urea is an examples of

Hydrolysis of urea is an example of

Hydrolysis of the salt of a strong acid and weak base will

Hydrolysis of the monomers of polyacrylonitrile gives

Hydrolysis of sugar is called :

Hydrolysis of sucrose with dilute aqueous sulphuric acid yields

Hydrolysis of sucrose is called

Hydrolysis of sucrose gives glucose.TRUE/FALSE

Hydrolysis of sucrose gives ……………………..

Hydrolysis of sucrose (C_12H_22O_11) by invertase give :

Hydrolysis of proteins give

Hydrolysis of protein in the stomach and interstine takes place due to presence of the enzymes

Hydrolysis of prop-1- yne in the presence of HgSO_4and H_2SO_4gives .............

Hydrolysis of protein in stomach and in intestine takes place due to action of enzyme.

Hydrolysis of phenyl isocyanide forms

Hydrolysis of phenyl isocyanide forms :

Hydrolysis of PCI_5 gives

Hydrolysis of oxide ion in water produces

Hydrolysis of one mole of peroxidisulphuric acid produces

Hydrolysis of one mole of peroxodisulphuric acid produces :

Hydrolysis of oils and fats gives glycerol and long chain fatty acids containing:

Hydrolysis of NCl_(3) indicates

Hydrolysis of nitriles with alkaline solution gives

Hydrolysis of NCl_(3) gives NH_(3) and X. Which of the following is X.

Hydrolysis of methyl cyanide gives :