46295 + Interview Questions in Chemistry

1.	Which of the following is the most reactive alkyl halide for a SN1 reaction?
Answer» Which of the following is the most reactive alkyl halide for a $S_{N} 1$ reaction?

Discussion

2.	Half mole of Helium gas is contained in a container at STP. Heat energy needed to double pressure of a gas , keeping the volume constant(heat capacity of gas =3j/gm K^°) 1)3276j 2)1638j 3)819j 4)409.5j
Answer» Half mole of Helium gas is contained in a container at STP. Heat energy needed to double pressure of a gas , keeping the volume constant(heat capacity of gas =3j/gm K^°) 1)3276j 2)1638j 3)819j 4)409.5j

Discussion

3.	Ethylacetate is formed by the reaction between ethanol and acetic acid andtheequilibriumis represented as: (i) Writethe concentration ratio (reaction quotient), Qc,for this reaction (note: water is not in excess and is not a solventin this reaction)(ii) At293 K, if one starts with 1.00 mol of acetic acid and 0.18 mol ofethanol, there is 0.171 mol of ethyl acetate in the final equilibriummixture. Calculate the equilibrium constant.(iii) Starting with 0.5 mol of ethanol and 1.0 mol of acetic acid andmaintaining it at 293 K, 0.214 mol of ethyl acetate is found aftersometime. Has equilibrium been reached?
Answer» Ethyl acetate is formed by the reaction between ethanol and acetic acid and the equilibrium is represented as: (i) Write the concentration ratio (reaction quotient), Qc, for this reaction (note: water is not in excess and is not a solvent in this reaction) (ii) At 293 K, if one starts with 1.00 mol of acetic acid and 0.18 mol of ethanol, there is 0.171 mol of ethyl acetate in the final equilibrium mixture. Calculate the equilibrium constant. (iii) Starting with 0.5 mol of ethanol and 1.0 mol of acetic acid and maintaining it at 293 K, 0.214 mol of ethyl acetate is found after sometime. Has equilibrium been reached?

3.

Ethylacetate is formed by the reaction between ethanol and acetic acid andtheequilibriumis represented as: (i) Writethe concentration ratio (reaction quotient), Qc,for this reaction (note: water is not in excess and is not a solventin this reaction)(ii) At293 K, if one starts with 1.00 mol of acetic acid and 0.18 mol ofethanol, there is 0.171 mol of ethyl acetate in the final equilibriummixture. Calculate the equilibrium constant.(iii) Starting with 0.5 mol of ethanol and 1.0 mol of acetic acid andmaintaining it at 293 K, 0.214 mol of ethyl acetate is found aftersometime. Has equilibrium been reached?

Answer»

Ethyl
acetate is formed by the reaction between ethanol and acetic acid and
the

equilibrium
is represented as:

(i) Write
the concentration ratio (reaction quotient), Qc,
for this reaction (note: water is not in excess and is not a solvent
in this reaction)

(ii) At
293 K, if one starts with 1.00 mol of acetic acid and 0.18 mol of
ethanol, there is 0.171 mol of ethyl acetate in the final equilibrium
mixture. Calculate the equilibrium constant.

(iii)
Starting with 0.5 mol of ethanol and 1.0 mol of acetic acid and
maintaining it at 293 K, 0.214 mol of ethyl acetate is found after
sometime. Has equilibrium been reached?

Discussion

4.	Why are alkenes easily oxidised?
Answer» Why are alkenes easily oxidised?

Discussion

5.	100 ml of 0.2 M HCI reacts with sodium hydroxide solution completely. The mass of NaOH reacted is01.290.0.6 g0 2.29O 0.8 g
Answer» 100 ml of 0.2 M HCI reacts with sodium hydroxide solution completely. The mass of NaOH reacted is 01.29 0.0.6 g 0 2.29 O 0.8 g

Discussion

6.	Differentiate between Leadership and Management.
Answer» Differentiate between Leadership and Management.

Discussion

7.	Electron-rich hydrides has excess electrons that are present as
Answer» Electron-rich hydrides has excess electrons that are present as

Discussion

8.	when BrO3^- ion react with Br^- ion in acidic medium ,Br2 is liberated.the equivalent mass of Br2 in the reaction is (M=molar mass of Br2)(1)5/3M (2)3/5M (3)4/6M (4)5/8M
Answer» when BrO3^- ion react with Br^- ion in acidic medium ,Br2 is liberated.the equivalent mass of Br2 in the reaction is (M=molar mass of Br2) (1)5/3M (2)3/5M (3)4/6M (4)5/8M

Discussion

9.	The work functions of Silver and Sodium are 4.6 eV and 2.3 eV respectively. The ratio of the slope of the stopping potential versus frequency plot for Silver to that of Sodium is ___ [2013]
Answer» The work functions of Silver and Sodium are 4.6 eV and 2.3 eV respectively. The ratio of the slope of the stopping potential versus frequency plot for Silver to that of Sodium is ___ [2013]

Discussion

10.	Al2O3 is reduced by electrolysis at low potentials and high currents. If 4.0×104 amperes ofcurrent is passed through molten Al2O3 for 6 hours, what mass of aluminium is produced? (Assume 100% current efficiency, at. mass of Al=27 g mol–1)
Answer» $A l_{2} O_{3}$ is reduced by electrolysis at low potentials and high currents. If $4.0 \times 10^{4} a m p e r e s$ ofcurrent is passed through molten $A l_{2} O_{3}$ for $6 h o u r s$ , what mass of aluminium is produced? (Assume $100 %$ current efficiency, at. mass of $A l = 27 g m o l^{- 1}$ )

Discussion

11.	2. What is the molarity of 0.2N Na2CO3 solution?
Answer» 2. What is the molarity of 0.2N Na2CO3 solution?

Discussion

12.	Number of hypervalent species among the following ClO−4,BF3,SO2−4,CO2−3
Answer» Number of hypervalent species among the following ClO−4,BF3,SO2−4,CO2−3

Discussion

13.	1.What holds different constitutents of various chemical spices in a chemical bond
Answer» 1.What holds different constitutents of various chemical spices in a chemical bond

Discussion

14.	NaOH aqueous solution is labeled as 10% (w/v).Density of the solution is 1.02 g/ml. Then the molefraction of the solute in the solution is(1) 0.05(3) 0.53(2) 0.0466(4) 0.053
Answer» NaOH aqueous solution is labeled as 10% (w/v).Density of the solution is 1.02 g/ml. Then the molefraction of the solute in the solution is(1) 0.05(3) 0.53(2) 0.0466(4) 0.053

Discussion

15.	In Van der Waal's equation of state of the gas law, the constant 'b' is a measure of
Answer» In Van der Waal's equation of state of the gas law, the constant 'b' is a measure of

Discussion

16.	Degree of unsaturation in valium?
Answer» Degree of unsaturation in valium?

Discussion

17.	Which of the following has least boiling point?
Answer» Which of the following has least boiling point?

Discussion

18.	The vapour pressure of a solution with volatile components A and B is given by the equationP. solution = 4.0 + 20 XIf mole fraction of B in vapour phase is 0.6, the mole fraction of A in solution phase is
Answer» The vapour pressure of a solution with volatile components A and B is given by the equation P. solution = 4.0 + 20 X If mole fraction of B in vapour phase is 0.6, the mole fraction of A in solution phase is

Discussion

19.	The mass of an electron is 9.1×10−31 kg. If the K.E. is given as 3.0×10−25 J. Calculate the wavelength of the electron.
Answer» The mass of an electron is $9.1 \times 10^{- 31} k g$ . If the K.E. is given as $3.0 \times 10^{- 25} J$ . Calculate the wavelength of the electron.

Discussion

20.	Why is the frequency of a closed organ pipe is 1:3:5
Answer» Why is the frequency of a closed organ pipe is 1:3:5

Discussion

21.	when to use a=vdv/dt and when dv/dt
Answer» when to use a=vdv/dt and when dv/dt

Discussion

22.	An ideal solution of benzene and toluene boils at 1 atm pressure at 90 ∘C. At 90 ∘C benzene has a vapour pressure of 1022 mm of Hg and toluene has a vapour pressure of 406 mm of Hg. The mole fraction of benzene in the solution:
Answer» An ideal solution of benzene and toluene boils at $1 a t m$ pressure at $90^{\circ} C$ . At $90^{\circ} C$ benzene has a vapour pressure of 1022 mm of Hg and toluene has a vapour pressure of 406 mm of Hg. The mole fraction of benzene in the solution:

Discussion

23.	If the equilibrium concentrations for X2, Y2 and XY are 1.2 x 10^3M, 5.83 x 10^12M and 8.9 x 10^2 M respectively. What is the initial concentration of X2 before the reaction occurred to form XY?a. 8.83 x 10^-1 Mb. 1.65 x 10^3 Mc. 1.13 x 10^3 Md. 2.09 x 10^3 M
Answer» If the equilibrium concentrations for X2, Y2 and XY are 1.2 x 10^3M, 5.83 x 10^12M and 8.9 x 10^2 M respectively. What is the initial concentration of X2 before the reaction occurred to form XY? a. 8.83 x 10^-1 M b. 1.65 x 10^3 M c. 1.13 x 10^3 M d. 2.09 x 10^3 M

Discussion

24.	A sol has positively charged colloidal particles. Which of the following solutions is required in the lowest concentration for coagulation?
Answer» A sol has positively charged colloidal particles. Which of the following solutions is required in the lowest concentration for coagulation?

Discussion

25.	If 7 moles of CaCl2 is mixed with 4 moles of Na3PO4, the maximum number of moles of Ca3(PO4)2 formed will be: CaCl2+Na3PO4→Ca3(PO4)2+NaCl
Answer» If 7 moles of $C a C l_{2}$ is mixed with 4 moles of $N a_{3} P O_{4}$ , the maximum number of moles of $C a_{3} (P O_{4})_{2}$ formed will be: $C a C l_{2} + N a_{3} P O_{4} \to C a_{3} (P O_{4})_{2} + N a C l$

Discussion

26.	Which have higher boiling point Hydrocarbon, Ether, Aldehyde, Ketone, Carboxylic acid, Haloalkanes, Alcohol, Phenol and Haloarenes of Comparable molecular mass ? Arrange them in order of decreasing order ?
Answer» Which have higher boiling point Hydrocarbon, Ether, Aldehyde, Ketone, Carboxylic acid, Haloalkanes, Alcohol, Phenol and Haloarenes of Comparable molecular mass ? Arrange them in order of decreasing order ?

Discussion

27.	Carbon has the highest catenation character because
Answer» Carbon has the highest catenation character because

Discussion

28.	A solution of Na2S2O3 is standarised iodometrically against 0.167 gram of KBrO3. This process requires 50 mL of the Na2S2O3 solution. What would be the normality of the Na2S2O3 solution?(Molar mass of KBrO3 is 167 g/mol)
Answer» A solution of $N a_{2} S_{2} O_{3}$ is standarised iodometrically against $0.167$ gram of $K B r O_{3}$ . This process requires $50 mL$ of the $N a_{2} S_{2} O_{3}$ solution. What would be the normality of the $N a_{2} S_{2} O_{3}$ solution? (Molar mass of $K B r O_{3}$ is $167 g/mol$ )

Discussion

29.	why carbonateions(HCO_3^- ) are inorganic compounds and CCl_{4 }and CF_4 are organic compound
Answer» why carbonateions(HCO_3^- ) are inorganic compounds and CCl_{4 }and CF_4 are organic compound

Discussion

30.	3-phenyl propene on reaction with HBr in presence of benzoyl peroxide gives (major product) explai
Answer» 3-phenyl propene on reaction with HBr in presence of benzoyl peroxide gives (major product) explai

Discussion

31.	A certain gas obeys P(Vm−b)=RT. The value of (δZδP)T is xbRT. The value of x is_____.(Z: compressibility factor)
Answer» A certain gas obeys $P (V_{m} - b) = R T .$ The value of ${(\frac{δ Z}{δ P})}_{T} is \frac{x b}{R T} .$ The value of $x$ is_____. (Z: compressibility factor)

Discussion

32.	The solubility of lead (II) iodide is 0.064 g/100 mL at 25o C. What is its solubility product?
Answer» The solubility of $l e a d (I I) i o d i d e$ is $0.064 g / 100 m L$ at $25^{o} C .$ What is its solubility product?

Discussion

33.	Why 'O' group elements have practically zero Electron Affinity?
Answer» Why 'O' group elements have practically zero Electron Affinity?

Discussion

34.	what is alloy formation?
Answer» what is alloy formation?

Discussion

35.	Which of the following electronic configuration represents argon
Answer» Which of the following electronic configuration represents argon

Discussion

36.	Equal volume of two gases which do not react together are enclosed in separate vessels. Their pressures are 10 mmHg and 400 mmHg respectively. If the two vessels are joined together, then what will be the pressure of the resulting mixture (temperature remaining constant)?
Answer» Equal volume of two gases which do not react together are enclosed in separate vessels. Their pressures are $10 mmHg$ and $400 mmHg$ respectively. If the two vessels are joined together, then what will be the pressure of the resulting mixture (temperature remaining constant)?

Discussion

37.	The reagent(s) used for softening the temporary hardness of water is (are):
Answer» The reagent(s) used for softening the temporary hardness of water is (are):

Discussion

38.	The air isa mixture of a number of gases. The major components are oxygenandnitrogen with approximate proportion of 20% is to 79% by volume at298K.The water is in equilibrium with air at a pressure of 10 atm. At 298Kif theHenry’slaw constants for oxygen and nitrogen are 3.30 × 107mm and 6.51 × 107mm respectively, calculate the composition of these gases in water.
Answer» The air is a mixture of a number of gases. The major components are oxygen and nitrogen with approximate proportion of 20% is to 79% by volume at 298 K. The water is in equilibrium with air at a pressure of 10 atm. At 298 Kif the Henry’s law constants for oxygen and nitrogen are 3.30 × 10⁷ mm and 6.51 × 10⁷ mm respectively, calculate the composition of these gases in water.

38.

The air isa mixture of a number of gases. The major components are oxygenandnitrogen with approximate proportion of 20% is to 79% by volume at298K.The water is in equilibrium with air at a pressure of 10 atm. At 298Kif theHenry’slaw constants for oxygen and nitrogen are 3.30 × 107mm and 6.51 × 107mm respectively, calculate the composition of these gases in water.

Answer»

The air is
a mixture of a number of gases. The major components are oxygen

and
nitrogen with approximate proportion of 20% is to 79% by volume at
298

K.
The water is in equilibrium with air at a pressure of 10 atm. At 298
Kif the

Henry’s
law constants for oxygen and nitrogen are 3.30 × 10⁷
mm and 6.51 × 10⁷
mm respectively, calculate the composition of these gases in water.

Discussion

39.	AgCI dissolved in KCN, NH3 and Na2S2O3, solutions, the complex ions produced respectively are
Answer» AgCI dissolved in $K C N, N H_{3}$ and $N a_{2} S_{2} O_{3}$ , solutions, the complex ions produced respectively are

Discussion

40.	What is the increase change in entropy when 11.2L of O2 are mixed with 11.2 L of H2 at STP?
Answer» What is the increase change in entropy when 11.2L of O2 are mixed with 11.2 L of H2 at STP?

Discussion

41.	H_2O and H_2O_2 resemble in (1) Hybridisation of oxygen (2) oxidation state of oxygen (3) structure (4) Bond angl
Answer» H_2O and H_2O_2 resemble in (1) Hybridisation of oxygen (2) oxidation state of oxygen (3) structure (4) Bond angl

Discussion

42.	Which of the following reagents could be used to distinguish between butanone and tert-butyl alcohol?
Answer» Which of the following reagents could be used to distinguish between butanone and tert-butyl alcohol?

Discussion

43.	Reduction of phenylethanenitrile using sodiumin ethanol gives(A) ethanaminelea(B) 1-phenylmethanamineN-methylaniline(C)D) 2-phenylethanamine
Answer» Reduction of phenylethanenitrile using sodiumin ethanol gives(A) ethanaminelea(B) 1-phenylmethanamineN-methylaniline(C)D) 2-phenylethanamine

Discussion

44.	In neutral medium, KMnO4 acts as a powerful oxidizing agent according to the reaction:2KMnO4+H2O→2MnO2+2KOH+3(O). The change involves
Answer» In neutral medium, $K M n O_{4}$ acts as a powerful oxidizing agent according to the reaction: $2 K M n O_{4} + H_{2} O \to 2 M n O_{2} + 2 K O H + 3 (O)$ . The change involves

Discussion

45.	80 Why is ammonia termed as a base though it does not contain OH- ions
Answer» 80 Why is ammonia termed as a base though it does not contain OH- ions

Discussion

46.	What is the difference between screening and penetrating effect? And Their different affect on ionisation energy?
Answer» What is the difference between screening and penetrating effect? And Their different affect on ionisation energy ?

Discussion

47.	Which of the following statements is correct for the boiling point of solvent containing a dissolved solid substance
Answer» Which of the following statements is correct for the boiling point of solvent containing a dissolved solid substance

Discussion

48.	Barium ions, CN− and Co+2 form an ionic complex. If this complex is 75% ionized in aqueous solution with Vant Hoff factor(i) equal to four and paramagnetic moment is found to be 1.73 BM(due to spin only) then hybridization state of Co(II) in the complex will be
Answer» Barium ions, $C N^{-}$ and $C o^{+ 2}$ form an ionic complex. If this complex is 75% ionized in aqueous solution with Vant Hoff factor(i) equal to four and paramagnetic moment is found to be 1.73 BM(due to spin only) then hybridization state of Co(II) in the complex will be

Discussion

49.	Why longer hydrophobic tail has lesser cmc
Answer» Why longer hydrophobic tail has lesser cmc

Discussion

50.	Calculate electronegativity of fluorine using paulings scale ,mullikens scale and allred Rochows scale.
Answer» Calculate electronegativity of fluorine using paulings scale ,mullikens scale and allred Rochows scale.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Which of the following is the most reactive alkyl halide for a SN1 reaction?

Half mole of Helium gas is contained in a container at STP. Heat energy needed to double pressure of a gas , keeping the volume constant(heat capacity of gas =3j/gm K^°) 1)3276j 2)1638j 3)819j 4)409.5j

Why are alkenes easily oxidised?

100 ml of 0.2 M HCI reacts with sodium hydroxide solution completely. The mass of NaOH reacted is01.290.0.6 g0 2.29O 0.8 g

Differentiate between Leadership and Management.

Electron-rich hydrides has excess electrons that are present as

when BrO3^- ion react with Br^- ion in acidic medium ,Br2 is liberated.the equivalent mass of Br2 in the reaction is (M=molar mass of Br2)(1)5/3M (2)3/5M (3)4/6M (4)5/8M

The work functions of Silver and Sodium are 4.6 eV and 2.3 eV respectively. The ratio of the slope of the stopping potential versus frequency plot for Silver to that of Sodium is ___ [2013]

Al2O3 is reduced by electrolysis at low potentials and high currents. If 4.0×104 amperes ofcurrent is passed through molten Al2O3 for 6 hours, what mass of aluminium is produced? (Assume 100% current efficiency, at. mass of Al=27 g mol–1)

2. What is the molarity of 0.2N Na2CO3 solution?

Number of hypervalent species among the following ClO−4,BF3,SO2−4,CO2−3

1.What holds different constitutents of various chemical spices in a chemical bond

NaOH aqueous solution is labeled as 10% (w/v).Density of the solution is 1.02 g/ml. Then the molefraction of the solute in the solution is(1) 0.05(3) 0.53(2) 0.0466(4) 0.053

In Van der Waal's equation of state of the gas law, the constant 'b' is a measure of

Degree of unsaturation in valium?

Which of the following has least boiling point?

The vapour pressure of a solution with volatile components A and B is given by the equationP. solution = 4.0 + 20 XIf mole fraction of B in vapour phase is 0.6, the mole fraction of A in solution phase is

The mass of an electron is 9.1×10−31 kg. If the K.E. is given as 3.0×10−25 J. Calculate the wavelength of the electron.

Why is the frequency of a closed organ pipe is 1:3:5

when to use a=vdv/dt and when dv/dt

An ideal solution of benzene and toluene boils at 1 atm pressure at 90 ∘C. At 90 ∘C benzene has a vapour pressure of 1022 mm of Hg and toluene has a vapour pressure of 406 mm of Hg. The mole fraction of benzene in the solution:

If the equilibrium concentrations for X2, Y2 and XY are 1.2 x 10^3M, 5.83 x 10^12M and 8.9 x 10^2 M respectively. What is the initial concentration of X2 before the reaction occurred to form XY?a. 8.83 x 10^-1 Mb. 1.65 x 10^3 Mc. 1.13 x 10^3 Md. 2.09 x 10^3 M

A sol has positively charged colloidal particles. Which of the following solutions is required in the lowest concentration for coagulation?

If 7 moles of CaCl2 is mixed with 4 moles of Na3PO4, the maximum number of moles of Ca3(PO4)2 formed will be: CaCl2+Na3PO4→Ca3(PO4)2+NaCl

Which have higher boiling point Hydrocarbon, Ether, Aldehyde, Ketone, Carboxylic acid, Haloalkanes, Alcohol, Phenol and Haloarenes of Comparable molecular mass ? Arrange them in order of decreasing order ?

Carbon has the highest catenation character because

A solution of Na2S2O3 is standarised iodometrically against 0.167 gram of KBrO3. This process requires 50 mL of the Na2S2O3 solution. What would be the normality of the Na2S2O3 solution?(Molar mass of KBrO3 is 167 g/mol)

why carbonateions(HCO_3^- ) are inorganic compounds and CCl_{4 }and CF_4 are organic compound

3-phenyl propene on reaction with HBr in presence of benzoyl peroxide gives (major product) explai

A certain gas obeys P(Vm−b)=RT. The value of (δZδP)T is xbRT. The value of x is_____.(Z: compressibility factor)

The solubility of lead (II) iodide is 0.064 g/100 mL at 25o C. What is its solubility product?

Why 'O' group elements have practically zero Electron Affinity?

what is alloy formation?

Which of the following electronic configuration represents argon

Equal volume of two gases which do not react together are enclosed in separate vessels. Their pressures are 10 mmHg and 400 mmHg respectively. If the two vessels are joined together, then what will be the pressure of the resulting mixture (temperature remaining constant)?

The reagent(s) used for softening the temporary hardness of water is (are):

AgCI dissolved in KCN, NH3 and Na2S2O3, solutions, the complex ions produced respectively are

What is the increase change in entropy when 11.2L of O2 are mixed with 11.2 L of H2 at STP?

H_2O and H_2O_2 resemble in (1) Hybridisation of oxygen (2) oxidation state of oxygen (3) structure (4) Bond angl

Which of the following reagents could be used to distinguish between butanone and tert-butyl alcohol?

Reduction of phenylethanenitrile using sodiumin ethanol gives(A) ethanaminelea(B) 1-phenylmethanamineN-methylaniline(C)D) 2-phenylethanamine

In neutral medium, KMnO4 acts as a powerful oxidizing agent according to the reaction:2KMnO4+H2O→2MnO2+2KOH+3(O). The change involves

80 Why is ammonia termed as a base though it does not contain OH- ions

What is the difference between screening and penetrating effect? And Their different affect on ionisation energy?

Which of the following statements is correct for the boiling point of solvent containing a dissolved solid substance

Barium ions, CN− and Co+2 form an ionic complex. If this complex is 75% ionized in aqueous solution with Vant Hoff factor(i) equal to four and paramagnetic moment is found to be 1.73 BM(due to spin only) then hybridization state of Co(II) in the complex will be

Why longer hydrophobic tail has lesser cmc

Calculate electronegativity of fluorine using paulings scale ,mullikens scale and allred Rochows scale.