46295 + Interview Questions in Chemistry

1.	The ore which is not concentrated by froth floatation but concentrated by leaching ? Exception to froth flotation .
Answer» The ore which is not concentrated by froth floatation but concentrated by leaching ? Exception to froth flotation .

Discussion

2.	For 2C6H6(l)+15O2(g)→12CO2(g)+6H2O(g) the difference in change in enthalpy and change in internal energy at 25∘C (kJ) is:
Answer» For $2 C_{6} H_{6} (l) + 15 O_{2} (g) \to 12 C O_{2} (g) + 6 H_{2} O (g)$ the difference in change in enthalpy and change in internal energy at $25^{\circ} C$ (kJ) is:

Discussion

3.	Can a value be both more precise and more accurate?
Answer» Can a value be both more precise and more accurate?

Discussion

4.	Whether pyrophosphorous acid has P-O-P bond in it?
Answer» Whether pyrophosphorous acid has P-O-P bond in it?

Discussion

5.	What is charge? Can single electron loose it's charge and gain some charge in nature
Answer» What is charge? Can single electron loose it's charge and gain some charge in nature

Discussion

6.	In the crystalline state, PCl5 shows which of the following hybridization/s?
Answer» In the crystalline state, $P C l_{5}$ shows which of the following hybridization/s?

Discussion

7.	The standard free energy change for the given reaction is - 10.26 kcal mol−1 at 25∘C.H2(g)+2AgCl(s)→2Ag(s)+2H+(aq)+2Cl−(aq)A cell using the above reaction is operated at 25∘C under conditions,PH2=1 atm[H+] and [Cl−]=0.1 MCalculate the emf of the cell.(Up to two decimal ,where 2.303RTF=0.059,R=8.314 J K−1,F=96500C)
Answer» The standard free energy change for the given reaction is - $10.26 k c a l m o l^{- 1}$ at $25^{\circ} C .$ $H_{2} (g) + 2 A g C l (s) \to 2 A g (s) + 2 H^{+} (a q) + 2 C l^{-} (a q)$ A cell using the above reaction is operated at $25^{\circ} C$ under conditions, $P_{H_{2}} = 1 a t m$ $[H^{+}] and [C l^{-}] = 0.1 M$ Calculate the emf of the cell. (Up to two decimal ,where $\frac{2.303 R T}{F} = 0.059, R = 8.314 J K^{- 1}, F = 96500 C$ )

Discussion

8.	is reaction equilibrium possible in irreversible reaction?
Answer» is reaction equilibrium possible in irreversible reaction?

Discussion

9.	What is volume of O2 required at zero degree Celsius and 1 atm to burn completly 1L propane gas
Answer» What is volume of O2 required at zero degree Celsius and 1 atm to burn completly 1L propane gas

Discussion

10.	The compound X (given below) is treated with 2 equivalents of CHBr3 in KOH, the possible products formed are:
Answer» The compound X (given below) is treated with 2 equivalents of $C H B r_{3}$ in $K O H$ , the possible products formed are:

Discussion

11.	7. The reaction A_2 +B_2 --------------> 2AB occurs in the following step A_2---------->A+A (slow) A+B_2 ------->AB +B (fast) A+B ---------->AB (fast ) The order of reaction is
Answer» 7. The reaction A_2 +B_2 --------------> 2AB occurs in the following step A_2---------->A+A (slow) A+B_2 ------->AB +B (fast) A+B ---------->AB (fast ) The order of reaction is

Discussion

12.	Describe the following. Acetylation Cannizzaro reaction Cross aldol condensation Decarboxylation
Answer» Describe the following. Acetylation Cannizzaro reaction Cross aldol condensation Decarboxylation

12.

Describe the following. Acetylation Cannizzaro reaction Cross aldol condensation Decarboxylation

Answer»

Describe the following.
Acetylation

Cannizzaro reaction

Cross aldol condensation

Decarboxylation

Discussion

13.	The enthalpy of neutralization of a weak acid in 1 M solution with a strong base is –56.1 kJ mol−1. The enthalpy of ionization of the acid is Y kJmol−1 and enthalpy of neutralization of the strong acid with a strong base is −57.3 kJequiv−1, if the % ionization of the weak acid in molar solution is 20% (assume the acid to be monobasic), then what is value of Y?
Answer» The enthalpy of neutralization of a weak acid in 1 M solution with a strong base is $- 56.1 k J m o l^{- 1}$ . The enthalpy of ionization of the acid is $Y k J m o l^{- 1}$ and enthalpy of neutralization of the strong acid with a strong base is $- 57.3 k J e q u i v^{- 1}$ , if the $%$ ionization of the weak acid in molar solution is $20 %$ (assume the acid to be monobasic), then what is value of Y?

Discussion

14.	58. What is the role of catalyst Cu in conversion of 3degree alcohol to Corresponding alkene and water? Explain
Answer» 58. What is the role of catalyst Cu in conversion of 3degree alcohol to Corresponding alkene and water? Explain

Discussion

15.	The general outermost electronic configuration of the most electropositive element isसर्वाधिक विद्युतधनी तत्व का सामान्य बाह्यतम इलेक्ट्रॉनीय विन्यास है
Answer» The general outermost electronic configuration of the most electropositive element is सर्वाधिक विद्युतधनी तत्व का सामान्य बाह्यतम इलेक्ट्रॉनीय विन्यास है

Discussion

16.	A metal salt (M) on reacting with sodium hydroxide forms sodium sulphate and a gelatinous white precipitate of a metal hydroxide. The precipitate is soluble in excess of sodium hydroxide. Identify M.
Answer» A metal salt (M) on reacting with sodium hydroxide forms sodium sulphate and a gelatinous white precipitate of a metal hydroxide. The precipitate is soluble in excess of sodium hydroxide. Identify M.

Discussion

17.	The compound (X) is
Answer» The compound (X) is

Discussion

18.	QUESTION 14.10 Enumerate the reactions of D-glucose which cannot be explained by its open chain structure.
Answer» QUESTION 14.10 Enumerate the reactions of D-glucose which cannot be explained by its open chain structure.

18.

QUESTION 14.10 Enumerate the reactions of D-glucose which cannot be explained by its open chain structure.

Answer»

QUESTION 14.10

Enumerate the reactions of D-glucose which cannot be explained by its open chain structure.

Discussion

19.	The lattice energy order for lithium halides is:
Answer» The lattice energy order for lithium halides is:

Discussion

20.	Which of the following processes is used in extractive metallurgy of Magnesium?
Answer» Which of the following processes is used in extractive metallurgy of Magnesium?

Discussion

21.	What is the quantum number which specifies the location as well as the energy of an electron?
Answer» What is the quantum number which specifies the location as well as the energy of an electron?

Discussion

22.	the ratio of number of collisions per second at the walls of container by He and O2 gas molecules kept at same volume and temperature is ?
Answer» the ratio of number of collisions per second at the walls of container by He and O2 gas molecules kept at same volume and temperature is ?

Discussion

23.	what is sextext electronic configuration in heterolytic clevage ?
Answer» what is sextext electronic configuration in heterolytic clevage ?

Discussion

24.	25.A mixture of CO and CO2 is found to have a density of 1.5 g/l at 303 K and 760 mmHg .what is their composition in the mixture
Answer» 25.A mixture of CO and CO2 is found to have a density of 1.5 g/l at 303 K and 760 mmHg .what is their composition in the mixture

Discussion

25.	Compare acidic nature A)Ortho amino phenol and meta amino phenol.does h bonding play a role here.
Answer» Compare acidic nature A)Ortho amino phenol and meta amino phenol.does h bonding play a role here.

Discussion

26.	why thiophene is aromatic ? Explain its aromaticity by the presence of (4n+2)pi delocalised electrons where n= 0,1,2,3 etc
Answer» why thiophene is aromatic ? Explain its aromaticity by the presence of (4n+2)pi delocalised electrons where n= 0,1,2,3 etc

Discussion

27.	At what temperature will the total KE of 0.30 mole of He be the same as the total KE of 0.40 mole of Ar at 400 K?
Answer» At what temperature will the total KE of 0.30 mole of He be the same as the total KE of 0.40 mole of Ar at 400 K?

Discussion

28.	For the reaction,PCI3(g) +Cl2(g)---->PCI5 (g), ◇H= -x kJIf the ◇H PCI3, is-y kJ, what is ◇Hf PCI5? (1) (x-y) kJ(2) (y-x) kJ(3)-x+y) kJ(4) (x+ y)
Answer» For the reaction,PCI3(g) +Cl2(g)---->PCI5 (g), ◇H= -x kJIf the ◇H PCI3, is-y kJ, what is ◇Hf PCI5? (1) (x-y) kJ(2) (y-x) kJ(3)-x+y) kJ(4) (x+ y)

Discussion

29.	What are Nucleophile
Answer» What are Nucleophile

Discussion

30.	Why does the change in entropy of the universe has to be positive forthe reaction to be spontaneous?
Answer» Why does the change in entropy of the universe has to be positive forthe reaction to be spontaneous?

Discussion

31.	37. lectrophilic aromatic substitution in napthalene,which position is more electrophilic?
Answer» 37. lectrophilic aromatic substitution in napthalene,which position is more electrophilic?

Discussion

32.	A typical compound that undergoes aldol condensation is:
Answer» A typical compound that undergoes aldol condensation is:

Discussion

33.	Why does amylopectin have a branched structure?
Answer» Why does amylopectin have a branched structure?

Discussion

34.	A pure crystallinesubstance, on being heated gradually, first forms a turbid looking liquid andthen the turbidity completely disappears. This behaviour is the characteristicof substances forming[BHU 2000]
Answer» A pure crystalline substance, on being heated gradually, first forms a turbid looking liquid and then the turbidity completely disappears. This behaviour is the characteristic of substances forming [BHU 2000]

34.

A pure crystallinesubstance, on being heated gradually, first forms a turbid looking liquid andthen the turbidity completely disappears. This behaviour is the characteristicof substances forming[BHU 2000]

Answer»

A pure crystalline
substance, on being heated gradually, first forms a turbid looking liquid and
then the turbidity completely disappears. This behaviour is the characteristic
of substances forming

[BHU 2000]

Discussion

35.	Question 9Which of the following groups contain all synthetic substances?(a) Nylon, Terylene, Wool(b) Cotton, Polycot, Rayon(c) PVC, Polythene, Bakelite(d) Acrylic, Silk, Wool
Answer» Question 9 Which of the following groups contain all synthetic substances? (a) Nylon, Terylene, Wool (b) Cotton, Polycot, Rayon (c) PVC, Polythene, Bakelite (d) Acrylic, Silk, Wool

Discussion

36.	In polythionic acid, H2SxO6(x=3 to 5) the oxidation state(s) of sulphur is/are :
Answer» In polythionic acid, $H_{2} S_{x} O_{6} (x = 3 to 5)$ the oxidation state(s) of sulphur is/are :

Discussion

37.	Identify the least stable ion amongst the following:
Answer» Identify the least stable ion amongst the following:

Discussion

38.	22.Which is the third member of alkyne group?
Answer» 22.Which is the third member of alkyne group?

Discussion

39.	how to convert cyclohexane into pen†an
Answer» how to convert cyclohexane into pen†an

Discussion

40.	Out of -O− and -NH−, which has greater +I (Inductive) Effect?
Answer» Out of -O− and -NH−, which has greater +I (Inductive) Effect?

Discussion

41.	Which of the following compounds contains unpaired electrons? KO2,NO2,SO2,BaO2,ClO2,O2,NO,N2O,O3,CO
Answer» Which of the following compounds contains unpaired electrons? $K O_{2}, N O_{2}, S O_{2}, B a O_{2}, C l O_{2}, O_{2}, N O, N_{2} O, O_{3}, C O$

Discussion

42.	Calculate the molality of ethanol in water in which the mole fraction of ethnol is 0.06 ?
Answer» Calculate the molality of ethanol in water in which the mole fraction of ethnol is $0.06 ?$

Discussion

43.	61 What is meant by HOMO-LUMO gap in a group?
Answer» 61 What is meant by HOMO-LUMO gap in a group?

Discussion

44.	What is the difference between serine and threonine?
Answer» What is the difference between serine and threonine?

Discussion

45.	Out of the following compounds, which will show geometrical isomerism?
Answer» Out of the following compounds, which will show geometrical isomerism?

Discussion

46.	1. Pair of species with the same bond order is 1)NO,CO 2)N2,O2 3)O2-,B2 4)O2+,NO+
Answer» 1. Pair of species with the same bond order is 1)NO,CO 2)N2,O2 3)O2-,B2 4)O2+,NO+

Discussion

47.	32.Calculate the nearest distance of approach of an alpha particle of energy 2.5 Mev being scattered by a gold nucleus Z=79
Answer» 32.Calculate the nearest distance of approach of an alpha particle of energy 2.5 Mev being scattered by a gold nucleus Z=79

Discussion

48.	In which oxidation state the boron can show stable covalent componds? And boron mosr stable and predominate oxidation state?
Answer» In which oxidation state the boron can show stable covalent componds? And boron mosr stable and predominate oxidation state?

Discussion

49.	Which one of the following exhibits optical isomerism?
Answer» Which one of the following exhibits optical isomerism?

Discussion

50.	The most reactive towards SN1 is:
Answer» The most reactive towards $S_{N} 1$ is:

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The ore which is not concentrated by froth floatation but concentrated by leaching ? Exception to froth flotation .

For 2C6H6(l)+15O2(g)→12CO2(g)+6H2O(g) the difference in change in enthalpy and change in internal energy at 25∘C (kJ) is:

Can a value be both more precise and more accurate?

Whether pyrophosphorous acid has P-O-P bond in it?

What is charge? Can single electron loose it's charge and gain some charge in nature

In the crystalline state, PCl5 shows which of the following hybridization/s?

is reaction equilibrium possible in irreversible reaction?

What is volume of O2 required at zero degree Celsius and 1 atm to burn completly 1L propane gas

The compound X (given below) is treated with 2 equivalents of CHBr3 in KOH, the possible products formed are:

7. The reaction A_2 +B_2 --------------> 2AB occurs in the following step A_2---------->A+A (slow) A+B_2 ------->AB +B (fast) A+B ---------->AB (fast ) The order of reaction is

Describe the following. Acetylation Cannizzaro reaction Cross aldol condensation Decarboxylation

58. What is the role of catalyst Cu in conversion of 3degree alcohol to Corresponding alkene and water? Explain

The general outermost electronic configuration of the most electropositive element isसर्वाधिक विद्युतधनी तत्व का सामान्य बाह्यतम इलेक्ट्रॉनीय विन्यास है

A metal salt (M) on reacting with sodium hydroxide forms sodium sulphate and a gelatinous white precipitate of a metal hydroxide. The precipitate is soluble in excess of sodium hydroxide. Identify M.

The compound (X) is

QUESTION 14.10 Enumerate the reactions of D-glucose which cannot be explained by its open chain structure.

The lattice energy order for lithium halides is:

Which of the following processes is used in extractive metallurgy of Magnesium?

What is the quantum number which specifies the location as well as the energy of an electron?

the ratio of number of collisions per second at the walls of container by He and O2 gas molecules kept at same volume and temperature is ?

what is sextext electronic configuration in heterolytic clevage ?

25.A mixture of CO and CO2 is found to have a density of 1.5 g/l at 303 K and 760 mmHg .what is their composition in the mixture

Compare acidic nature A)Ortho amino phenol and meta amino phenol.does h bonding play a role here.

why thiophene is aromatic ? Explain its aromaticity by the presence of (4n+2)pi delocalised electrons where n= 0,1,2,3 etc

At what temperature will the total KE of 0.30 mole of He be the same as the total KE of 0.40 mole of Ar at 400 K?

For the reaction,PCI3(g) +Cl2(g)---->PCI5 (g), ◇H= -x kJIf the ◇H PCI3, is-y kJ, what is ◇Hf PCI5? (1) (x-y) kJ(2) (y-x) kJ(3)-x+y) kJ(4) (x+ y)

What are Nucleophile

Why does the change in entropy of the universe has to be positive forthe reaction to be spontaneous?

37. lectrophilic aromatic substitution in napthalene,which position is more electrophilic?

A typical compound that undergoes aldol condensation is:

Why does amylopectin have a branched structure?

A pure crystallinesubstance, on being heated gradually, first forms a turbid looking liquid andthen the turbidity completely disappears. This behaviour is the characteristicof substances forming[BHU 2000]

Question 9Which of the following groups contain all synthetic substances?(a) Nylon, Terylene, Wool(b) Cotton, Polycot, Rayon(c) PVC, Polythene, Bakelite(d) Acrylic, Silk, Wool

In polythionic acid, H2SxO6(x=3 to 5) the oxidation state(s) of sulphur is/are :

Identify the least stable ion amongst the following:

22.Which is the third member of alkyne group?

how to convert cyclohexane into pen†an

Out of -O− and -NH−, which has greater +I (Inductive) Effect?

Which of the following compounds contains unpaired electrons? KO2,NO2,SO2,BaO2,ClO2,O2,NO,N2O,O3,CO

Calculate the molality of ethanol in water in which the mole fraction of ethnol is 0.06 ?

61 What is meant by HOMO-LUMO gap in a group?

What is the difference between serine and threonine?

Out of the following compounds, which will show geometrical isomerism?

1. Pair of species with the same bond order is 1)NO,CO 2)N2,O2 3)O2-,B2 4)O2+,NO+

32.Calculate the nearest distance of approach of an alpha particle of energy 2.5 Mev being scattered by a gold nucleus Z=79

In which oxidation state the boron can show stable covalent componds? And boron mosr stable and predominate oxidation state?

Which one of the following exhibits optical isomerism?

The most reactive towards SN1 is: