46295 + Interview Questions in Chemistry

1.	Which of the following shows the correct order of decreasing acidity? (Here Ph− indicates phenyl group)
Answer» Which of the following shows the correct order of decreasing acidity? (Here $P h -$ indicates phenyl group)

Discussion

2.	The photohalogenation reactions of paraffins with chlorine proceed by a free radical chain mechanism. From the following set of reactions, pick up the chain terminating reaction.
Answer» The photohalogenation reactions of paraffins with chlorine proceed by a free radical chain mechanism. From the following set of reactions, pick up the chain terminating reaction.

Discussion

3.	Which of the following is true regarding preparation of aldehydes and ketones ? (i) Both can be prepared by the oxidation of the concerned alcohol with copper at about 250∘C (ii) Both can be prepared by the oxidation of the concerned alcohol by oppenauer oxidation. (iii) Both can be prepared by the oxidation of respective alcohol with acidic dichromate.
Answer» Which of the following is true regarding preparation of aldehydes and ketones ? (i) Both can be prepared by the oxidation of the concerned alcohol with copper at about $250^{\circ} C$ (ii) Both can be prepared by the oxidation of the concerned alcohol by oppenauer oxidation. (iii) Both can be prepared by the oxidation of respective alcohol with acidic dichromate.

Discussion

4.	The standard enthalpies of formation ofCO2(g) , H2O(l) and glucose (s) at 25° C are –400 kJ/mole, – 300 kJ/mole, –1300 kJ./molerespectively. The standard enthalpy ofcombustion per gram of glucose at 25° C is : which formula should be used as enthalpy of combustion is givenenthalpy(product- reactant)enthalpy(reactent-product)also,solve the problem
Answer» The standard enthalpies of formation of CO2(g) , H2O(l) and glucose (s) at 25° C are – 400 kJ/mole, – 300 kJ/mole, –1300 kJ./mole respectively. The standard enthalpy of combustion per gram of glucose at 25° C is : which formula should be used as enthalpy of combustion is given enthalpy(product- reactant) enthalpy(reactent-product) also,solve the problem

Discussion

5.	In a given reaction; Ag(CN)−2⇌Ag++2CN−, the equilibrium constant at 25∘C is 4.0×10−19, then the silver ion concentration in a solution which was originally 0.1 M in KCN and 0.03 M in AgNO3 is:
Answer» In a given reaction; $A g (C N)_{2}^{-} ⇌ A g^{+} + 2 C N^{-}$ , the equilibrium constant at $25^{\circ} C$ is $4.0 \times 10^{- 19}$ , then the silver ion concentration in a solution which was originally $0.1 M$ in $K C N$ and $0.03 M$ in $A g N O_{3}$ is:

Discussion

6.	Calculate the molarity of ethanol in water , in which the mole fraction of ethanol is 0.040 (density of water is 1.)
Answer» Calculate the molarity of ethanol in water , in which the mole fraction of ethanol is 0.040 (density of water is 1.)

Discussion

7.	19. What is dihedral angle? For what value of this angle will ethane have maximum potential energy and why?
Answer» 19. What is dihedral angle? For what value of this angle will ethane have maximum potential energy and why?

Discussion

8.	The compound which is largely responsible for initial setting and early strength gain of Ordinary Portland Cement is
Answer» The compound which is largely responsible for initial setting and early strength gain of Ordinary Portland Cement is

Discussion

9.	Write the correct order of atomic radii in group 13 elements:
Answer» Write the correct order of atomic radii in group 13 elements:

Discussion

10.	Which of the following reducing agents can be used for the following transformation?CH3−CH=CH−COOH→CH3−CH=CH−CH2OH
Answer» Which of the following reducing agents can be used for the following transformation? $C H_{3} - C H = C H - C O O H \to C H_{3} - C H = C H - C H_{2} O H$

Discussion

11.	The major product when C2H5O− is in excess is
Answer» The major product when $C_{2} H_{5} O^{-}$ is in excess is

Discussion

12.	Can a -NO2 group be converted to -NH2 with the help of lithiumaluminiumhydride?
Answer» Can a -NO2 group be converted to -NH2 with the help of lithiumaluminiumhydride?

Discussion

13.	Where neo- and iso- used as prefixes in isomerism
Answer» Where neo- and iso- used as prefixes in isomerism

Discussion

14.	A gas is allowed to expand in a well insulated container against a constant external pressure of 2.5 atm from an initial volume of 2.50 L to a final volume of 4.50 L. The change in internal energy ΔU of the gas in joules will be
Answer» A gas is allowed to expand in a well insulated container against a constant external pressure of 2.5 atm from an initial volume of 2.50 L to a final volume of 4.50 L. The change in internal energy $Δ U$ of the gas in joules will be

Discussion

15.	Hoffmann bromamide degradation of benzamide gives product A, which upon heating with CHCl3 and NaOH gives product B. The structures of A and B are :
Answer» Hoffmann bromamide degradation of benzamide gives product A, which upon heating with $C H C l_{3}$ and $N a O H$ gives product B. The structures of A and B are :

Discussion

16.	If some charge say q1 is given to the outer shell of two concentric conducting shell then no charge is developed on the inner shell. Why ?
Answer» If some charge say q1 is given to the outer shell of two concentric conducting shell then no charge is developed on the inner shell. Why ?

Discussion

17.	Write the mechanism ofthe following reaction:
Answer» Write the mechanism of the following reaction:

17.

Write the mechanism ofthe following reaction:

Answer»

Write the mechanism of
the following reaction:

Discussion

18.	The bond dissociation energy of C - H in CH4 from the equationC(g) + 4H(g) ⟶ CH4(g) ΔH = -397.8 Kcal is
Answer» The bond dissociation energy of C - H in $C H_{4}$ from the equation C(g) + 4H(g) $⟶$ $C H_{4}$ (g) $Δ$ H = -397.8 Kcal is

Discussion

19.	A rod of uniform thickness is placed along X axis with the one end at origin.If length of rod is L and its linear mass density is proportional to X, then find distance o its centre of mass from origin
Answer» A rod of uniform thickness is placed along X axis with the one end at origin.If length of rod is L and its linear mass density is proportional to X, then find distance o its centre of mass from origin

Discussion

20.	How does calcium has 8 electrons in its third orbit instead of 10 electrons as the third orbit can hold a maximum of 18 electrons?
Answer» How does calcium has 8 electrons in its third orbit instead of 10 electrons as the third orbit can hold a maximum of 18 electrons?

Discussion

21.	The count rate of radioactive sample falls from 8.0×106 per second to 1.0×106 per second in 12 hours. What will be the count rate after 20 hours from the beginning?
Answer» The count rate of radioactive sample falls from $8.0 \times 10^{6}$ per second to $1.0 \times 10^{6}$ per second in 12 hours. What will be the count rate after 20 hours from the beginning?

Discussion

22.	Which of the followin option is correct for the bond dissociation ethalpy of halogen molecules?
Answer» Which of the followin option is correct for the bond dissociation ethalpy of halogen molecules?

Discussion

23.	15 The molar volume of liquid benzene (density =0.877 g/ml) increases by a factor of 2750 as it vaporises at 20 degree C and that of liquid toluene (density 0.867 g/ml) increases by a factor of 7720 at 20 degree C.A solution of benzene and toluene at 20 degree C has a vapour pressure of 46 torr.Find the mole fraction of benzene in the vapour above the solution.
Answer» 15 The molar volume of liquid benzene (density =0.877 g/ml) increases by a factor of 2750 as it vaporises at 20 degree C and that of liquid toluene (density 0.867 g/ml) increases by a factor of 7720 at 20 degree C.A solution of benzene and toluene at 20 degree C has a vapour pressure of 46 torr.Find the mole fraction of benzene in the vapour above the solution.

Discussion

24.	Q.Among the butane conformers, whenviewed about C2-C3 bond, which occur atenergy minima on a graph of potentialenergy versus dihedral angle?a) Gauche onlyb) Gauchec) Antid) Eclipsed
Answer» Q.Among the butane conformers, whenviewed about C2-C3 bond, which occur atenergy minima on a graph of potentialenergy versus dihedral angle?a) Gauche onlyb) Gauchec) Antid) Eclipsed

Discussion

25.	Which of the following are formed on addition reaction of DCI with 3-methyl-1-butene
Answer» Which of the following are formed on addition reaction of DCI with 3-methyl-1-butene

Discussion

26.	Q 27/30 The freezing point of a solution that contains 10 g urea in100 g water is (Kf for H20 1.86^° C m)
Answer» Q 27/30 The freezing point of a solution that contains 10 g urea in100 g water is (Kf for H20 1.86^° C m)

Discussion

27.	What happens when acid react with base?
Answer» What happens when acid react with base?

Discussion

28.	The specific heat at constant pressure and at constant volume for an ideal gas are Cp and Cv and its adiabatic and isothermal elasticities are Ephi and Eθ respectively. The ratio of Eϕ to Eθ is
Answer» The specific heat at constant pressure and at constant volume for an ideal gas are $C_{p}$ and $C_{v}$ and its adiabatic and isothermal elasticities are $E_{p h i}$ and $E_{θ}$ respectively. The ratio of $E_{ϕ}$ to $E_{θ}$ is

Discussion

29.	Work function of a metal Is 10 EV.The longest wavelength of light that can cause photoelectric emission from this metal is
Answer» Work function of a metal Is 10 EV.The longest wavelength of light that can cause photoelectric emission from this metal is

Discussion

30.	What is the coordination number of octahedral and tetrahedral voids in lattice ??
Answer» What is the coordination number of octahedral and tetrahedral voids in lattice ??

Discussion

31.	which is more stable?explain 1.CF2(SINGLET CARBENE) 2.CF2(TRIPLET CARBENE)
Answer» which is more stable?explain 1.CF2(SINGLET CARBENE) 2.CF2(TRIPLET CARBENE)

Discussion

32.	Which one of the following is the smallest in size?
Answer» Which one of the following is the smallest in size?

Discussion

33.	Which among the following would be the most reactive?
Answer» Which among the following would be the most reactive?

Discussion

34.	The edge length of rock salt type unit cell is 508 pm . If the radius of the cation is 110 pm ,the ratio of the anion assumiing NaCl type struture is
Answer» The edge length of rock salt type unit cell is 508 pm . If the radius of the cation is 110 pm ,the ratio of the anion assumiing NaCl type struture is

Discussion

35.	53 Explain energy level diagram of O2 molecules. Also explain its paramagnetic and diamagnetic property
Answer» 53 Explain energy level diagram of O2 molecules. Also explain its paramagnetic and diamagnetic property

Discussion

36.	What is the order of reactivity of the following compounds towards nucleophilic substitution?
Answer» What is the order of reactivity of the following compounds towards nucleophilic substitution?

Discussion

37.	An ideal gas in a cylinder is separated by a piston in such a way that the entropy of one part is S1 and that of the other part is S2. Given that S1>S2. If the piston is removed, then the total entropy of the system will be :
Answer» An ideal gas in a cylinder is separated by a piston in such a way that the entropy of one part is $S_{1}$ and that of the other part is $S_{2}$ . Given that $S_{1} > S_{2}$ . If the piston is removed, then the total entropy of the system will be :

Discussion

38.	Specific conductance of 0.2 M aqueous solution is 16.4×10−2 ohm−1 cm−1. The molar conductance of solution is
Answer» Specific conductance of $0.2 M$ aqueous solution is $16.4 \times 10^{- 2} o h m^{- 1} c m^{- 1}$ . The molar conductance of solution is

Discussion

39.	Find the total number of oxygen atoms in 3×103 formula units of [Ni(H2O)6]Cl2.
Answer» Find the total number of oxygen atoms in $3 \times 10^{3}$ formula units of $[N i (H_{2} O)_{6}] C l_{2}$ .

Discussion

40.	Why square planar complexes do not show optical activity?
Answer» Why square planar complexes do not show optical activity?

Discussion

41.	Which one of the following is a highly corrosive salt?
Answer» Which one of the following is a highly corrosive salt?

Discussion

42.	What are coordination complexes
Answer» What are coordination complexes

Discussion

43.	If the amount of heat required to raise temperature Of 2 mol of monoatomic ideal gas by 1 degree celsius At constant pressure is 10 cal then change in internal energy of gas is
Answer» If the amount of heat required to raise temperature Of 2 mol of monoatomic ideal gas by 1 degree celsius At constant pressure is 10 cal then change in internal energy of gas is

Discussion

44.	What are metal carbonyles?
Answer» What are metal carbonyles?

Discussion

45.	AlF3+B2O3→ ________ +BF3
Answer» $A l F_{3} + B_{2} O_{3}$ $\to$ ________ $+ B F_{3}$

Discussion

46.	Dihydrogengas used in Haber’s process is produced by reacting methanefrom natural gas with high temperature steam. The first stage of twostage reaction involves the formation of CO and H2.In second stage, CO formed in first stage is reacted with more steamin water gas shift reaction,Ifa reaction vessel at 400°C is charged with an equimolar mixtureof CO and steam such that 4.0bar, what will be the partial pressure of H2at equilibrium? Kp=10.1 at 400°C
Answer» Dihydrogen gas used in Haber’s process is produced by reacting methane from natural gas with high temperature steam. The first stage of two stage reaction involves the formation of CO and H₂. In second stage, CO formed in first stage is reacted with more steam in water gas shift reaction, If a reaction vessel at 400°C is charged with an equimolar mixture of CO and steam such that 4.0 bar, what will be the partial pressure of H₂ at equilibrium? Kp= 10.1 at 400°C

46.

Dihydrogengas used in Haber’s process is produced by reacting methanefrom natural gas with high temperature steam. The first stage of twostage reaction involves the formation of CO and H2.In second stage, CO formed in first stage is reacted with more steamin water gas shift reaction,Ifa reaction vessel at 400°C is charged with an equimolar mixtureof CO and steam such that 4.0bar, what will be the partial pressure of H2at equilibrium? Kp=10.1 at 400°C

Answer»

Dihydrogen
gas used in Haber’s process is produced by reacting methane
from natural gas with high temperature steam. The first stage of two
stage reaction involves the formation of CO and H₂.
In second stage, CO formed in first stage is reacted with more steam
in water gas shift reaction,

If
a reaction vessel at 400°C is charged with an equimolar mixture
of CO and steam such that
4.0
bar, what will be the partial pressure of H₂
at equilibrium? Kp=
10.1 at 400°C

Discussion

47.	10g of argon gas is compressed reversibly and is isothermally from a volume 10l to 5l at 27'C, what will be W,Q,E,H.
Answer» 10g of argon gas is compressed reversibly and is isothermally from a volume 10l to 5l at 27'C, what will be W,Q,E,H.

Discussion

48.	The freezing point of a solution prepared from 1.25 gm of a non-electrolyte and 20gm of water is 271.9 K. If molar depression constant is 1.86 K mole-1, then molar mass of the solute will be
Answer» The freezing point of a solution prepared from 1.25 gm of a non-electrolyte and 20gm of water is 271.9 K. If molar depression constant is 1.86 K mole^-1, then molar mass of the solute will be

Discussion

49.	Which of the following is an E-isomer?
Answer» Which of the following is an E-isomer?

Discussion

50.	The correct matching is
Answer» The correct matching is

50.

The correct matching is

Answer»

The correct matching is

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Which of the following shows the correct order of decreasing acidity? (Here Ph− indicates phenyl group)

The photohalogenation reactions of paraffins with chlorine proceed by a free radical chain mechanism. From the following set of reactions, pick up the chain terminating reaction.

In a given reaction; Ag(CN)−2⇌Ag++2CN−, the equilibrium constant at 25∘C is 4.0×10−19, then the silver ion concentration in a solution which was originally 0.1 M in KCN and 0.03 M in AgNO3 is:

Calculate the molarity of ethanol in water , in which the mole fraction of ethanol is 0.040 (density of water is 1.)

19. What is dihedral angle? For what value of this angle will ethane have maximum potential energy and why?

The compound which is largely responsible for initial setting and early strength gain of Ordinary Portland Cement is

Write the correct order of atomic radii in group 13 elements:

Which of the following reducing agents can be used for the following transformation?CH3−CH=CH−COOH→CH3−CH=CH−CH2OH

The major product when C2H5O− is in excess is

Can a -NO2 group be converted to -NH2 with the help of lithiumaluminiumhydride?

Where neo- and iso- used as prefixes in isomerism

A gas is allowed to expand in a well insulated container against a constant external pressure of 2.5 atm from an initial volume of 2.50 L to a final volume of 4.50 L. The change in internal energy ΔU of the gas in joules will be

Hoffmann bromamide degradation of benzamide gives product A, which upon heating with CHCl3 and NaOH gives product B. The structures of A and B are :

If some charge say q1 is given to the outer shell of two concentric conducting shell then no charge is developed on the inner shell. Why ?

Write the mechanism ofthe following reaction:

The bond dissociation energy of C - H in CH4 from the equationC(g) + 4H(g) ⟶ CH4(g) ΔH = -397.8 Kcal is

A rod of uniform thickness is placed along X axis with the one end at origin.If length of rod is L and its linear mass density is proportional to X, then find distance o its centre of mass from origin

How does calcium has 8 electrons in its third orbit instead of 10 electrons as the third orbit can hold a maximum of 18 electrons?

The count rate of radioactive sample falls from 8.0×106 per second to 1.0×106 per second in 12 hours. What will be the count rate after 20 hours from the beginning?

Which of the followin option is correct for the bond dissociation ethalpy of halogen molecules?

Q.Among the butane conformers, whenviewed about C2-C3 bond, which occur atenergy minima on a graph of potentialenergy versus dihedral angle?a) Gauche onlyb) Gauchec) Antid) Eclipsed

Which of the following are formed on addition reaction of DCI with 3-methyl-1-butene

Q 27/30 The freezing point of a solution that contains 10 g urea in100 g water is (Kf for H20 1.86^° C m)

What happens when acid react with base?

The specific heat at constant pressure and at constant volume for an ideal gas are Cp and Cv and its adiabatic and isothermal elasticities are Ephi and Eθ respectively. The ratio of Eϕ to Eθ is

Work function of a metal Is 10 EV.The longest wavelength of light that can cause photoelectric emission from this metal is

What is the coordination number of octahedral and tetrahedral voids in lattice ??

which is more stable?explain 1.CF2(SINGLET CARBENE) 2.CF2(TRIPLET CARBENE)

Which one of the following is the smallest in size?

Which among the following would be the most reactive?

The edge length of rock salt type unit cell is 508 pm . If the radius of the cation is 110 pm ,the ratio of the anion assumiing NaCl type struture is

53 Explain energy level diagram of O2 molecules. Also explain its paramagnetic and diamagnetic property

What is the order of reactivity of the following compounds towards nucleophilic substitution?

An ideal gas in a cylinder is separated by a piston in such a way that the entropy of one part is S1 and that of the other part is S2. Given that S1&gt;S2. If the piston is removed, then the total entropy of the system will be :

Specific conductance of 0.2 M aqueous solution is 16.4×10−2 ohm−1 cm−1. The molar conductance of solution is

Find the total number of oxygen atoms in 3×103 formula units of [Ni(H2O)6]Cl2.

Why square planar complexes do not show optical activity?

Which one of the following is a highly corrosive salt?

What are coordination complexes

If the amount of heat required to raise temperature Of 2 mol of monoatomic ideal gas by 1 degree celsius At constant pressure is 10 cal then change in internal energy of gas is

What are metal carbonyles?

AlF3+B2O3→ ________ +BF3

10g of argon gas is compressed reversibly and is isothermally from a volume 10l to 5l at 27'C, what will be W,Q,E,H.

The freezing point of a solution prepared from 1.25 gm of a non-electrolyte and 20gm of water is 271.9 K. If molar depression constant is 1.86 K mole-1, then molar mass of the solute will be

Which of the following is an E-isomer?

The correct matching is

An ideal gas in a cylinder is separated by a piston in such a way that the entropy of one part is S1 and that of the other part is S2. Given that S1>S2. If the piston is removed, then the total entropy of the system will be :