46295 + Interview Questions in Chemistry

1.	60. In case of structure of pcl3f2 it is a trigonal bipyramidal structure. Why is the fluorine placed in the axial plane and chlorine in the equatorial plane and not vice versa?
Answer» 60. In case of structure of pcl3f2 it is a trigonal bipyramidal structure. Why is the fluorine placed in the axial plane and chlorine in the equatorial plane and not vice versa?

Discussion

2.	28.STEP:1 O3 is in equilibrium with O2 & O with forward rate constant k1 an backward rate constant k2 (fast). STEP 2: O3 + O -> 2O2 (slow) rate constant k find order of the reaction
Answer» 28.STEP:1 O3 is in equilibrium with O2 & O with forward rate constant k1 an backward rate constant k2 (fast). STEP 2: O3 + O -> 2O2 (slow) rate constant k find order of the reaction

Discussion

3.	The amount of ice that will separate out on cooling a solution containing 50 g of ethylene glycol in 200 g water to −9.3∘C is: (K′f=1.86Kmolality−1)
Answer» The amount of ice that will separate out on cooling a solution containing $50 g$ of ethylene glycol in $200 g$ water to $- {9.3}^{\circ} C$ is: $(K_{f}^{'} = 1.86 K m o l a l i t y^{- 1})$

Discussion

4.	For certain first order reaction, 75% of the reaction complete in 30 min. How much time it require to complete 99.9% of the reaction?
Answer» For certain first order reaction, 75% of the reaction complete in 30 min. How much time it require to complete 99.9% of the reaction?

Discussion

5.	explanation of line spectrum of hydrogen
Answer» explanation of line spectrum of hydrogen

Discussion

6.	We know that in isothermal process ΔT=0 which implies Q=W. My doubt is that Q also equals nCΔT and ΔT=0 due to which Q should be equal to zero and W as well.please resolve my confusion
Answer» We know that in isothermal process ΔT=0 which implies Q=W. My doubt is that Q also equals nCΔT and ΔT=0 due to which Q should be equal to zero and W as well.please resolve my confusion

Discussion

7.	Number of aromatic species among the following___
Answer» Number of aromatic species among the following___

Discussion

8.	what is the difference between spectra of hydrogen atom and multielectron atoms?
Answer» what is the difference between spectra of hydrogen atom and multielectron atoms?

Discussion

9.	Differentiate between the principle of estimation of nitrogen in an organic compound by (i) Dumas method and (ii) Kjeldahl’s method.
Answer» Differentiate between the principle of estimation of nitrogen in an organic compound by (i) Dumas method and (ii) Kjeldahl’s method.

Discussion

10.	Electrolysis of H2SO4 (conc.) gives the following atanode (1) H2 (2) O2 (3) H2S203 (4) H2S2O8
Answer» Electrolysis of H2SO4 (conc.) gives the following atanode (1) H2 (2) O2 (3) H2S203 (4) H2S2O8

Discussion

11.	18. Energy required for ionization of 0.02 gram atom of magnesium is x kJ. The amount of energy required to ionise 1 atoom of magnesium is 1) x kJ 2) x / (0.02 * NA) J 3) (x1000 ) / (0.02 NA) J 4) x NA J
Answer» 18. Energy required for ionization of 0.02 gram atom of magnesium is x kJ. The amount of energy required to ionise 1 atoom of magnesium is 1) x kJ 2) x / (0.02 * NA) J 3) (x1000 ) / (0.02 NA) J 4) x NA J

Discussion

12.	arrangeTHE FOLLOWING in order of basic character,NH^{2-},OH^-,O^{2-},S^{2-
Answer» arrangeTHE FOLLOWING in order of basic character,NH^{2-},OH^-,O^{2-},S^{2-

Discussion

13.	For an element of group no. 13 sidden jump on ionization energy will be observed 1. IE1 and IE42.IE1 IE23.IE2 IE3.4.IE4 IE5
Answer» For an element of group no. 13 sidden jump on ionization energy will be observed 1. IE1 and IE4 2.IE1 IE2 3.IE2 IE3. 4.IE4 IE5

Discussion

14.	42.An inductor of 10 mH shows 50 mH when operated with a core made of ferrite. The susceptibility of ferrite is- A)5 B)4 C)3 D)2
Answer» 42.An inductor of 10 mH shows 50 mH when operated with a core made of ferrite. The susceptibility of ferrite is- A)5 B)4 C)3 D)2

Discussion

15.	A Carnot's engine operates with an efficiency of 40% with its sink at 27 °C. The amount by which the temperature of the source be increased with an aim to increase the efficiency by 10% is K.
Answer» A Carnot's engine operates with an efficiency of 40% with its sink at $27 ° C$ . The amount by which the temperature of the source be increased with an aim to increase the efficiency by 10% is K.

Discussion

16.	What is a free vector? What is a localized vector? Give graphs to elaborate them.
Answer» What is a free vector? What is a localized vector? Give graphs to elaborate them.

Discussion

17.	A thin metal pipe of 1 meter length and 1 cm radius carries steam at 100∘C. This is covered by two layers of lagging. The thermal conductivity of outer layer, which is 2 cm thick is 3.6×10−4 cal/cm∘C sec while that of inner layer, which is 1 cm thick is 1.2×10−4 cal/m∘C sec. If the outer surface of the laggings is at 30∘C, find (a) temperature of the cylindrical interface of two lagging materials (b) the mass of steam condensed per second. Given loge=0.6931.
Answer» A thin metal pipe of 1 meter length and 1 cm radius carries steam at $100^{\circ} C$ . This is covered by two layers of lagging. The thermal conductivity of outer layer, which is 2 cm thick is $3.6 \times 10^{- 4} c a l / c m^{\circ} C$ sec while that of inner layer, which is 1 cm thick is $1.2 \times 10^{- 4} c a l / m^{\circ} C$ sec. If the outer surface of the laggings is at $30^{\circ} C$ , find (a) temperature of the cylindrical interface of two lagging materials (b) the mass of steam condensed per second. Given $l o g_{e} = 0.6931$ .

Discussion

18.	Why solid particles have negligible space between them?
Answer» Why solid particles have negligible space between them?

Discussion

19.	what is basic difference between antibonding and bonding
Answer» what is basic difference between antibonding and bonding

Discussion

20.	Alkene CH3−CH=CH2 reacts readily with B2H6 and the product on oxidation with alkaline hydrogen peroxides produces:
Answer» Alkene $C H_{3} - C H = C H_{2}$ reacts readily with $B_{2} H_{6}$ and the product on oxidation with alkaline hydrogen peroxides produces:

Discussion

21.	36. What amount of bromine will be react to convert 2g phenol into 2,4,6-tribromophenol ??
Answer» 36. What amount of bromine will be react to convert 2g phenol into 2,4,6-tribromophenol ??

Discussion

22.	According to Bohr's theory, the energy of an electron in the nth energy level of hydrogen like species is given by:En=−21.76×10−19n2(Z2) JCalculate the longest wavelength of light that will be needed to completely remove an electron from the third Bohr orbit of He+ ion.
Answer» According to Bohr's theory, the energy of an electron in the $n^{t h}$ energy level of hydrogen like species is given by: $E_{n} = \frac{- 21.76 \times 10^{- 19}}{n^{2}} (Z^{2}) J$ Calculate the longest wavelength of light that will be needed to completely remove an electron from the third Bohr orbit of $H e^{+}$ ion.

Discussion

23.	Which of the following represents + E effect ?
Answer» Which of the following represents + E effect ?

Discussion

24.	37. A crystalline solid ab has nacl type structure with b having radius. 250 pm. Which of following cation can be made slip into tetrahedral site of Crystal AB.? A. P (radius 180pm) B. Radius 56 pm. C. Radius 200pm D. Radius 150pm
Answer» 37. A crystalline solid ab has nacl type structure with b having radius. 250 pm. Which of following cation can be made slip into tetrahedral site of Crystal AB.? A. P (radius 180pm) B. Radius 56 pm. C. Radius 200pm D. Radius 150pm

Discussion

25.	163. Given, Cu^{2+} +2e=Cu, E_o=+0.32 V,Ksp of Cu(OH)_2= 1.0 x 10^{-19}What is E^° Of Cu2+/Cu couple at pH12?(a) 0.78 V(c) 0.12 V(b) 0.12 V(d) +0.10 V10l2
Answer» 163. Given, Cu^{2+} +2e=Cu, E_o=+0.32 V,Ksp of Cu(OH)_2= 1.0 x 10^{-19}What is E^° Of Cu2+/Cu couple at pH12?(a) 0.78 V(c) 0.12 V(b) 0.12 V(d) +0.10 V10l2

Discussion

26.	could it is possible that water freeze(become ice) at a temperature above 100^0C with very high pressure.
Answer» could it is possible that water freeze(become ice) at a temperature above 100^0C with very high pressure.

Discussion

27.	Balance by iso electron method As2 S3 +NO3- -----------> AsO4 -3 +NO +S
Answer» Balance by iso electron method As2 S3 +NO3- -----------> AsO4 -3 +NO +S

Discussion

28.	1-) when we talk about nitrogen what should we consider it to be N or N2.
Answer» 1-) when we talk about nitrogen what should we consider it to be N or N2.

Discussion

29.	The solubility of CdSO4 in water is 8.0×10–4 mol L–1. Its solubility in 0.01 M H2SO4 solution is ______× 10–6 mol L–1. (Round off to the Nearest Integer).Assume that solubility is much less than 0.01 M.
Answer» The solubility of $C d S O_{4}$ in water is $8.0 \times 10^{- 4}$ mol L $^{- 1}$ . Its solubility in $0.01 M H_{2} S O_{4}$ solution is ______× $10^{- 6} m o l L^{- 1}$ . (Round off to the Nearest Integer). Assume that solubility is much less than 0.01 M.

Discussion

30.	Waterdrops are spherical in shape. This can be explained by? 1)viscosity 2)surface tension 3)volatility 4)vaporization
Answer» Waterdrops are spherical in shape. This can be explained by? 1)viscosity 2)surface tension 3)volatility 4)vaporization

Discussion

31.	What are esters?
Answer» What are esters?

Discussion

32.	Diels - Alder reaction is an example of:
Answer» Diels - Alder reaction is an example of:

Discussion

33.	Ionized compound
Answer» Ionized compound

Discussion

34.	At what [Br−1]√[CO23 −] does the following cell have its reaction at equilibrium? Ag(s)\|Ag2CO3(s)\|Na2CO3(aq)\|\|KBr(aq)\|AgBr(s)\|Ag(s) Ksp = 8×10−12 for Ag2CO3 and Ksp=4×10−13 for AgBr
Answer» At what $\frac{[B r^{- 1}]}{\sqrt{[C O_{3}^{2}^{-}]}}$ does the following cell have its reaction at equilibrium? $A g (s) \| A g_{2} C O_{3} (s) \| N a_{2} C O_{3} (a q) \| \| K B r (a q) \| A g B r (s) \| A g (s)$ $K_{s p}$ = $8 \times 10^{- 12} f o r A g_{2} C O_{3} a n d K_{s p} = 4 \times 10^{- 13} f o r A g B r$

34.

At what [Br−1]√[CO23 −] does the following cell have its reaction at equilibrium? Ag(s)|Ag2CO3(s)|Na2CO3(aq)||KBr(aq)|AgBr(s)|Ag(s) Ksp = 8×10−12 for Ag2CO3 and Ksp=4×10−13 for AgBr

Answer»

At what $\frac{[B r^{- 1}]}{\sqrt{[C O_{3}^{2}^{-}]}}$ does the following cell have its reaction at equilibrium?

$A g (s) | A g_{2} C O_{3} (s) | N a_{2} C O_{3} (a q) | | K B r (a q) | A g B r (s) | A g (s)$

$K_{s p}$ = $8 \times 10^{- 12} f o r A g_{2} C O_{3} a n d K_{s p} = 4 \times 10^{- 13} f o r A g B r$

Discussion

35.	For the reaction A+B→ products,it is observed that a)on doubling the initial concentration of A only the rate of the reaction is doubled and b)on doubling the initial concentrations of both A and B there is a change by a factor of 8 in the rate of the reaction The rate of this reaction is given by,
Answer» For the reaction A+B→ products,it is observed that a)on doubling the initial concentration of A only the rate of the reaction is doubled and b)on doubling the initial concentrations of both A and B there is a change by a factor of 8 in the rate of the reaction The rate of this reaction is given by,

Discussion

36.	Theionization constant of dimethylamine is 5.4 × 10–4.Calculate its degree of ionization in its 0.02M solution. Whatpercentage of dimethylamine is ionized if the solution is also 0.1Min NaOH?
Answer» The ionization constant of dimethylamine is 5.4 × 10^–4. Calculate its degree of ionization in its 0.02M solution. What percentage of dimethylamine is ionized if the solution is also 0.1M in NaOH?

Discussion

37.	An aqueous solution of a non volatile solute boils at 101.04^° C . If the solute does not dissociate in aqueous solution . what is the mole fraction of the solute
Answer» An aqueous solution of a non volatile solute boils at 101.04^° C . If the solute does not dissociate in aqueous solution . what is the mole fraction of the solute

Discussion

38.	The half life of a zero order reaction is equal to:
Answer» The half life of a zero order reaction is equal to:

Discussion

39.	In CCP,there are 8 tetrahedral sites and all are present completely inside the unit cell.There are 13 octahedral sites out of which 1 is at the body centre and 12 are at edge centres.Like CCP,another packing is HCP,in which the number of tetrahedral sites that are completely inside one unit cell is x.find x
Answer» In CCP,there are 8 tetrahedral sites and all are present completely inside the unit cell.There are 13 octahedral sites out of which 1 is at the body centre and 12 are at edge centres.Like CCP,another packing is HCP,in which the number of tetrahedral sites that are completely inside one unit cell is x.find x

Discussion

40.	The specific heat of an ideal gas varies according to S=aT3, where, a is a constant and T is absolute temperature. The heat energy needed to raise the temperature of a unit mass of the gas from 1 K to 2 K will be
Answer» The specific heat of an ideal gas varies according to $S = a T^{3}$ , where, $a$ is a constant and $T$ is absolute temperature. The heat energy needed to raise the temperature of a unit mass of the gas from $1 K$ to $2 K$ will be

Discussion

41.	The reagent used for converting ethanoic acid to ethanol is
Answer» The reagent used for converting ethanoic acid to ethanol is

Discussion

42.	Which of the following compound does not contain a carbonyl group?
Answer» Which of the following compound does not contain a carbonyl group?

Discussion

43.	Li3N+H2O→A(gas)Li2CO3Δ−→B(gas) Hybridisation of the central atom in A and B respectively:
Answer» $L i_{3} N + H_{2} O \to A (gas)$ $L i_{2} C O_{3} Δ - \to B (gas)$ Hybridisation of the central atom in $A$ and $B$ respectively:

Discussion

44.	Iso-butylene when subjected to hydroboration oxidation reaction yields
Answer» Iso-butylene when subjected to hydroboration oxidation reaction yields

Discussion

45.	How many resonating structures can be made in case of C6H5OH and how?
Answer» How many resonating structures can be made in case of C6H5OH and how?

Discussion

46.	44. What is reformatsky reaction
Answer» 44. What is reformatsky reaction

Discussion

47.	why hcl predominantly covalent in gaseous state but is ionic in gaseous solution give explanation
Answer» why hcl predominantly covalent in gaseous state but is ionic in gaseous solution give explanation

Discussion

48.	Which order is correct in spectrochemical series of ligands?
Answer» Which order is correct in spectrochemical series of ligands?

Discussion

49.	Calculatethe energy required for the processTheionization energy for the H atom in the ground state is 2.18 ×10–18J atom–1
Answer» Calculate the energy required for the process The ionization energy for the H atom in the ground state is 2.18 ×10^–18 J atom^–1

49.

Calculatethe energy required for the processTheionization energy for the H atom in the ground state is 2.18 ×10–18J atom–1

Answer»

Calculate
the energy required for the process

The
ionization energy for the H atom in the ground state is 2.18 ×10^–18
J atom^–1

Discussion

50.	consider the following radioactive decay {}^{90}X\xrightarrow{β-emission}{}^{90}Y\xrightarrow{β-emission}Z If half life of {}^{90}Y is 73 hours and that of {}^{90}X is 20 years,then the amount of {}^{90}Y in equilibrium with 1g of {}^{90}X i
Answer» consider the following radioactive decay {}^{90}X\xrightarrow{β-emission}{}^{90}Y\xrightarrow{β-emission}Z If half life of {}^{90}Y is 73 hours and that of {}^{90}X is 20 years,then the amount of {}^{90}Y in equilibrium with 1g of {}^{90}X i

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

60. In case of structure of pcl3f2 it is a trigonal bipyramidal structure. Why is the fluorine placed in the axial plane and chlorine in the equatorial plane and not vice versa?

28.STEP:1 O3 is in equilibrium with O2 & O with forward rate constant k1 an backward rate constant k2 (fast). STEP 2: O3 + O -> 2O2 (slow) rate constant k find order of the reaction

The amount of ice that will separate out on cooling a solution containing 50 g of ethylene glycol in 200 g water to −9.3∘C is: (K′f=1.86Kmolality−1)

For certain first order reaction, 75% of the reaction complete in 30 min. How much time it require to complete 99.9% of the reaction?

explanation of line spectrum of hydrogen

We know that in isothermal process ΔT=0 which implies Q=W. My doubt is that Q also equals nCΔT and ΔT=0 due to which Q should be equal to zero and W as well.please resolve my confusion

Number of aromatic species among the following___

what is the difference between spectra of hydrogen atom and multielectron atoms?

Differentiate between the principle of estimation of nitrogen in an organic compound by (i) Dumas method and (ii) Kjeldahl’s method.

Electrolysis of H2SO4 (conc.) gives the following atanode (1) H2 (2) O2 (3) H2S203 (4) H2S2O8

18. Energy required for ionization of 0.02 gram atom of magnesium is x kJ. The amount of energy required to ionise 1 atoom of magnesium is 1) x kJ 2) x / (0.02 * NA) J 3) (x*1000 ) / (0.02 * NA) J 4) x NA J

arrangeTHE FOLLOWING in order of basic character,NH^{2-},OH^-,O^{2-},S^{2-

For an element of group no. 13 sidden jump on ionization energy will be observed 1. IE1 and IE42.IE1 IE23.IE2 IE3.4.IE4 IE5

42.An inductor of 10 mH shows 50 mH when operated with a core made of ferrite. The susceptibility of ferrite is- A)5 B)4 C)3 D)2

A Carnot's engine operates with an efficiency of 40% with its sink at 27 °C. The amount by which the temperature of the source be increased with an aim to increase the efficiency by 10% is K.

What is a free vector? What is a localized vector? Give graphs to elaborate them.

Why solid particles have negligible space between them?

what is basic difference between antibonding and bonding

Alkene CH3−CH=CH2 reacts readily with B2H6 and the product on oxidation with alkaline hydrogen peroxides produces:

36. What amount of bromine will be react to convert 2g phenol into 2,4,6-tribromophenol ??

According to Bohr's theory, the energy of an electron in the nth energy level of hydrogen like species is given by:En=−21.76×10−19n2(Z2) JCalculate the longest wavelength of light that will be needed to completely remove an electron from the third Bohr orbit of He+ ion.

Which of the following represents + E effect ?

37. A crystalline solid ab has nacl type structure with b having radius. 250 pm. Which of following cation can be made slip into tetrahedral site of Crystal AB.? A. P (radius 180pm) B. Radius 56 pm. C. Radius 200pm D. Radius 150pm

163. Given, Cu^{2+} +2e=Cu, E_o=+0.32 V,Ksp of Cu(OH)_2= 1.0 x 10^{-19}What is E^° Of Cu2+/Cu couple at pH12?(a) 0.78 V(c) 0.12 V(b) 0.12 V(d) +0.10 V10l2

could it is possible that water freeze(become ice) at a temperature above 100^0C with very high pressure.

Balance by iso electron method As2 S3 +NO3- -----------> AsO4 -3 +NO +S

1-) when we talk about nitrogen what should we consider it to be N or N2.

The solubility of CdSO4 in water is 8.0×10–4 mol L–1. Its solubility in 0.01 M H2SO4 solution is ______× 10–6 mol L–1. (Round off to the Nearest Integer).Assume that solubility is much less than 0.01 M.

Waterdrops are spherical in shape. This can be explained by? 1)viscosity 2)surface tension 3)volatility 4)vaporization

What are esters?

Diels - Alder reaction is an example of:

Ionized compound

At what [Br−1]√[CO23 −] does the following cell have its reaction at equilibrium? Ag(s)|Ag2CO3(s)|Na2CO3(aq)||KBr(aq)|AgBr(s)|Ag(s) Ksp = 8×10−12 for Ag2CO3 and Ksp=4×10−13 for AgBr

Theionization constant of dimethylamine is 5.4 × 10–4.Calculate its degree of ionization in its 0.02M solution. Whatpercentage of dimethylamine is ionized if the solution is also 0.1Min NaOH?

An aqueous solution of a non volatile solute boils at 101.04^° C . If the solute does not dissociate in aqueous solution . what is the mole fraction of the solute

The half life of a zero order reaction is equal to:

The specific heat of an ideal gas varies according to S=aT3, where, a is a constant and T is absolute temperature. The heat energy needed to raise the temperature of a unit mass of the gas from 1 K to 2 K will be

The reagent used for converting ethanoic acid to ethanol is

Which of the following compound does not contain a carbonyl group?

Li3N+H2O→A(gas)Li2CO3Δ−→B(gas) Hybridisation of the central atom in A and B respectively:

Iso-butylene when subjected to hydroboration oxidation reaction yields

How many resonating structures can be made in case of C6H5OH and how?

44. What is reformatsky reaction

why hcl predominantly covalent in gaseous state but is ionic in gaseous solution give explanation

Which order is correct in spectrochemical series of ligands?

Calculatethe energy required for the processTheionization energy for the H atom in the ground state is 2.18 ×10–18J atom–1

consider the following radioactive decay {}^{90}X\xrightarrow{β-emission}{}^{90}Y\xrightarrow{β-emission}Z If half life of {}^{90}Y is 73 hours and that of {}^{90}X is 20 years,then the amount of {}^{90}Y in equilibrium with 1g of {}^{90}X i

18. Energy required for ionization of 0.02 gram atom of magnesium is x kJ. The amount of energy required to ionise 1 atoom of magnesium is 1) x kJ 2) x / (0.02 * NA) J 3) (x1000 ) / (0.02 NA) J 4) x NA J