46295 + Interview Questions in Chemistry

1.	At 0∘C and 2.00 atm partial pressure of oxygen, the aqueous solubility of O2(g) is 60.2 mL O2 per litre. Thus, molarity of O2 in a saturated water solution when the O2 is under the normal partial pressure of 0.3024 atm is
Answer» At $0^{\circ} C$ and $2.00 a t m$ partial pressure of oxygen, the aqueous solubility of $O_{2} (g)$ is $60.2 m L$ $O_{2}$ per litre. Thus, molarity of $O_{2}$ in a saturated water solution when the $O_{2}$ is under the normal partial pressure of $0.3024 a t m$ is

Discussion

2.	The degree of dissociation of I2(iodine gas) molecule of 1000^°C and under atmospheric pressure is 40% by volume. If dissociation is reduced to 20% at the same temperature, total equilibrium pressure on the gas is (a) 1.57 atm (b) 2.57 atm (c)3.57 (d) 4.57 atm
Answer» The degree of dissociation of I2(iodine gas) molecule of 1000^°C and under atmospheric pressure is 40% by volume. If dissociation is reduced to 20% at the same temperature, total equilibrium pressure on the gas is (a) 1.57 atm (b) 2.57 atm (c)3.57 (d) 4.57 atm

Discussion

3.	Write two situations when fire can not be controlled using water.
Answer» Write two situations when fire can not be controlled using water.

Discussion

4.	16. The table shown below gives the bond dissociation energies (E diss) for single covalent bonds of carbon (c) atoms with element A, B ,Z and D .Which element has the smallest atoms ? (1) Z (2) D (3) A (4) B
Answer» 16. The table shown below gives the bond dissociation energies (E diss) for single covalent bonds of carbon (c) atoms with element A, B ,Z and D .Which element has the smallest atoms ? (1) Z (2) D (3) A (4) B

Discussion

5.	Why Conductivity decreases with concentration ?
Answer» Why Conductivity decreases with concentration ?

Discussion

6.	Following phenomena occurs due to the presence of ________.
Answer» Following phenomena occurs due to the presence of ________.

Discussion

7.	A dye emits 75% of the absorbed energy as fluorescence. The number of quanta absorbed and emitted out are in the ratio 2:3. Find the wavelength of the emitted radiation if the absorbed radiation has a wavelength of x oA.
Answer» A dye emits $75 %$ of the absorbed energy as fluorescence. The number of quanta absorbed and emitted out are in the ratio $2 : 3$ . Find the wavelength of the emitted radiation if the absorbed radiation has a wavelength of $x o A$ .

Discussion

8.	Some statements are given about acylation of amines with acid chloride I. Tertiary amines do not react with acid chloride II. This reaction is an example of a nuclophilic addition reaction III. This reaction is carried out in the presence of pyridine IV. Aliphatic and aromatic primary and secondary amines involve in this reaction The correct statements is/ are
Answer» Some statements are given about acylation of amines with acid chloride I. Tertiary amines do not react with acid chloride II. This reaction is an example of a nuclophilic addition reaction III. This reaction is carried out in the presence of pyridine IV. Aliphatic and aromatic primary and secondary amines involve in this reaction The correct statements is/ are

8.

Some statements are given about acylation of amines with acid chloride I. Tertiary amines do not react with acid chloride II. This reaction is an example of a nuclophilic addition reaction III. This reaction is carried out in the presence of pyridine IV. Aliphatic and aromatic primary and secondary amines involve in this reaction The correct statements is/ are

Answer»

Some statements are given about acylation of amines with acid chloride

I. Tertiary amines do not react with acid chloride

II. This reaction is an example of a nuclophilic addition reaction

III. This reaction is carried out in the presence of pyridine

IV. Aliphatic and aromatic primary and secondary amines involve in this reaction

The correct statements is/ are

Discussion

9.	In the electrolysis of acidified water:(a) Name the gas collected at (i) anode, and (ii) cathode(b) Why is the volume of gas collected at one electrode double than that at the other electrode?(c) What would happen if dilute sulphuric acid is not added to water?
Answer» In the electrolysis of acidified water: (a) Name the gas collected at (i) anode, and (ii) cathode (b) Why is the volume of gas collected at one electrode double than that at the other electrode? (c) What would happen if dilute sulphuric acid is not added to water?

Discussion

10.	Zeolite used to soften hardness of water is hydrated.
Answer» Zeolite used to soften hardness of water is hydrated.

Discussion

11.	A crystalline salt when heated becomes anhydrous and loses 51.2% of its weight. The anhydrous salt on analysis gave the percentage composition as Mg-20.0% S-26.66% and O-53.33% Calculate the molecular formula of the anhydrous salt and the crystalline salt. Molecular mass of anhydrous salt is 120
Answer» A crystalline salt when heated becomes anhydrous and loses 51.2% of its weight. The anhydrous salt on analysis gave the percentage composition as Mg-20.0% S-26.66% and O-53.33% Calculate the molecular formula of the anhydrous salt and the crystalline salt. Molecular mass of anhydrous salt is 120

Discussion

12.	14. Titanium crystallizes in a face centred cubic latticeIt reacts with carbon or hydrogen interstitially byallowing atoms of these elements to occupy holesin the host lattice. Hydrogen occupies tetrahedralholes but carbon occupies octahedral holes theformula of titanium carbide and hydride are
Answer» 14. Titanium crystallizes in a face centred cubic latticeIt reacts with carbon or hydrogen interstitially byallowing atoms of these elements to occupy holesin the host lattice. Hydrogen occupies tetrahedralholes but carbon occupies octahedral holes theformula of titanium carbide and hydride are

Discussion

13.	A compound X formed after heating coke with lime react with water to give Y which on passing over red-hot iron at 873 produces Z. The compound Z is
Answer» A compound X formed after heating coke with lime react with water to give Y which on passing over red-hot iron at 873 produces Z. The compound Z is

Discussion

14.	What is the unit for entropy change?
Answer» What is the unit for entropy change?

Discussion

15.	what is significant figures ?
Answer» what is significant figures ?

Discussion

16.	If an electron in a hydrogen atom (ground state) absorbs a photon of 12.1 eV, then change in angular momentum of electron is
Answer» If an electron in a hydrogen atom (ground state) absorbs a photon of $12.1 e V$ , then change in angular momentum of electron is

Discussion

17.	Question 20.1Explain the following term with one example: Corrosion.
Answer» Question 20.1 Explain the following term with one example: Corrosion.

Discussion

18.	What is the value of Z ( rank ) for Diamond?
Answer» What is the value of Z ( rank ) for Diamond?

Discussion

19.	explain in breif about soil,air,tip&serpantine layering?
Answer» explain in breif about soil,air,tip&serpantine layering?

Discussion

20.	Which of the following statements is correct ?(1) All the three N–O bond lengths in HNO3are equal(2) All P–Cl bond lengths in PCl5 molecule ingaseous state are equal(3) P4 molecule in white phosphorus haveangular strain therefore white phosphorusis very reactive(4) PBr5 is ionic in solid state in which cationis tetrahedral and anion is octahedra(acc. to me both 3&4 are correct ,is it so?)
Answer» Which of the following statements is correct ? (1) All the three N–O bond lengths in HNO3 are equal (2) All P–Cl bond lengths in PCl5 molecule in gaseous state are equal (3) P4 molecule in white phosphorus have angular strain therefore white phosphorus is very reactive (4) PBr5 is ionic in solid state in which cation is tetrahedral and anion is octahedra (acc. to me both 3&4 are correct ,is it so?)

Discussion

21.	Predict conditions under which Al might be expected to reduce MgO.
Answer» Predict conditions under which Al might be expected to reduce MgO.

Discussion

22.	Compounds having the same molecular formula but a difference in their functional groups are known as
Answer» Compounds having the same molecular formula but a difference in their functional groups are known as

Discussion

23.	Complétez avec les articles partitifs.
Answer» Complétez avec les articles partitifs.

Discussion

24.	Equilibriumconstant, Kcforthe reaction at500 K is 0.061.Ata particular time, the analysis shows that composition of thereaction mixture is 3.0 mol L–1N2,2.0 mol L–1H2and 0.5 mol L–1NH3.Is the reaction at equilibrium? If not in which direction does thereaction tend to proceed to reach equilibrium?
Answer» Equilibrium constant, K_cfor the reaction at 500 K is 0.061. At a particular time, the analysis shows that composition of the reaction mixture is 3.0 mol L^–1 N₂, 2.0 mol L^–1 H₂ and 0.5 mol L^–1 NH₃. Is the reaction at equilibrium? If not in which direction does the reaction tend to proceed to reach equilibrium?

24.

Equilibriumconstant, Kcforthe reaction at500 K is 0.061.Ata particular time, the analysis shows that composition of thereaction mixture is 3.0 mol L–1N2,2.0 mol L–1H2and 0.5 mol L–1NH3.Is the reaction at equilibrium? If not in which direction does thereaction tend to proceed to reach equilibrium?

Answer»

Equilibrium
constant, K_cfor
the reaction

at
500 K is 0.061.

At
a particular time, the analysis shows that composition of the
reaction mixture is 3.0 mol L^–1
N₂,
2.0 mol L^–1
H₂
and 0.5 mol L^–1
NH₃.
Is the reaction at equilibrium? If not in which direction does the
reaction tend to proceed to reach equilibrium?

Discussion

25.	Propene when heated with chlorine at about 500∘C forms
Answer» Propene when heated with chlorine at about $500^{\circ} C$ forms

Discussion

26.	Half - lives of decomposition of NH3 on the surface of a catalyst for different initial pressures are given as :p(torr) 200 300 500t1.2(min) 10 15 25The order of the reaction is :
Answer» Half - lives of decomposition of $N H_{3}$ on the surface of a catalyst for different initial pressures are given as : p(torr) 200 300 500 $t_{1.2 (m i n)}$ 10 15 25 The order of the reaction is :

Discussion

27.	Why has the use of methods like Teflon coating become more common?
Answer» Why has the use of methods like Teflon coating become more common?

Discussion

28.	Ionic hydride reacts with water to give:
Answer» Ionic hydride reacts with water to give:

Discussion

29.	The entropy change when two moles of an ideal monoatomic gas is heated from 200∘C to 300∘C reversibly and isochorically?
Answer» The entropy change when two moles of an ideal monoatomic gas is heated from $200^{\circ} C to 300^{\circ} C$ reversibly and isochorically?

Discussion

30.	how many lone pair are and bond pair are there in so3. is there any short trick to find lone pair and bond pair
Answer» how many lone pair are and bond pair are there in so3. is there any short trick to find lone pair and bond pair

Discussion

31.	Why hybridization of C in C3O2 is sp
Answer» Why hybridization of C in C3O2 is sp

Discussion

32.	Which of the following represents an heterogenous equilibrium?
Answer» Which of the following represents an heterogenous equilibrium?

Discussion

33.	& AllMS16. For a certain gas the ratio of specific heats is givento be y = 1.5. Foi this gas3R(2) Cp3R(1) CyJ5R5R(4) C(3) СpJ
Answer» & AllMS16. For a certain gas the ratio of specific heats is givento be y = 1.5. Foi this gas3R(2) Cp3R(1) CyJ5R5R(4) C(3) СpJ

Discussion

34.	Which of the following aqueous solutions can act as an acidic buffer?
Answer» Which of the following aqueous solutions can act as an acidic buffer?

Discussion

35.	ntin qualitative analysis group 1 metals can be separated from other ions by precipitating them as chloride salts. a solution initially contains Ag+ and Pb2+ at a concentration of 0.10M . aqueous HCl is added to the solution untill the Cl- concentration is 0.10M. what will be the concentration of Ag+ and Pb2+ be at equilibrium ? [Ksp for AgCl=1.8/10000000000 , Ksp for PbCl2 =1.7/100000]n
Answer» ntin qualitative analysis group 1 metals can be separated from other ions by precipitating them as chloride salts. a solution initially contains Ag+ and Pb2+ at a concentration of 0.10M . aqueous HCl is added to the solution untill the Cl- concentration is 0.10M. what will be the concentration of Ag+ and Pb2+ be at equilibrium ? [Ksp for AgCl=1.8/10000000000 , Ksp for PbCl2 =1.7/100000]n

Discussion

36.	what is the product of reaction benzene with chloroiodide(CLI)? orC6H6+CL
Answer» what is the product of reaction benzene with chloroiodide(CLI)? orC6H6+CL

Discussion

37.	Identify the chiral molecule in the following pair:
Answer» Identify the chiral molecule in the following pair:

Discussion

38.	What is the effect of elctron releasing group and electron withdrawing group in coupling rxn of benzene diazoniumhalide?
Answer» What is the effect of elctron releasing group and electron withdrawing group in coupling rxn of benzene diazoniumhalide?

Discussion

39.	11 A given metal crystalises out with a cubic structure having edge lenght of 361pm. If there are four metal atom in one unit cell, what is the radius of one atom?
Answer» 11 A given metal crystalises out with a cubic structure having edge lenght of 361pm. If there are four metal atom in one unit cell, what is the radius of one atom?

Discussion

40.	How many structural isomers are there of dimethylcyclohexane
Answer» How many structural isomers are there of dimethylcyclohexane

Discussion

41.	In polyatomic molecules the term mean or average bond enthalpy is used. It is calculated by dividing the total bond dissociation enthalpy by?
Answer» In polyatomic molecules the term mean or average bond enthalpy is used. It is calculated by dividing the total bond dissociation enthalpy by?

Discussion

42.	ate the atomic and ionic mass on an element same? plese explain.
Answer» ate the atomic and ionic mass on an element same? plese explain.

Discussion

43.

The value of a function f(x) are tabulated below x0123f(x)12110Using Newton's forward difference formula, the cubic polynomial that can be fitted to the above data, is

Answer»

The value of a function f(x) are tabulated below

x	0	1	2	3
f(x)	1	2	1	10

Using Newton's forward difference formula, the cubic polynomial that can be fitted to the above data, is

Discussion

44.	State the role of silica in the metallurgy of copper .
Answer» State the role of silica in the metallurgy of copper .

Discussion

45.	Match the following enzymes given in Column I with the reactions they catalyse given in Column II. Column I Column II (Enzymes) (Reactions)A. Invertase1. Decomposition of ureainto NH3 and CO2.B. Maltase2. Conversion of glucose into ethyl alcohol.C. Pepsin3. Hydrolysis ofmaltose into glucose.D. Urease4. Hydrolysis of cane sugar.E. Zymase5. Hydrolysis of proteins into peptides.
Answer» Match the following enzymes given in Column I with the reactions they catalyse given in Column II. $\begin{matrix} C o l u m n I & C o l u m n I I (E n z y m e s) & (R e a c t i o n s) A . I n v e r t a s e & 1. D e c o m p o s i t i o n o f u r e a i n t o N H_{3} a n d C O_{2} . B . M a l t a s e & 2. C o n v e r s i o n o f g l u c o s e i n t o e t h y l a l c o h o l . C . P e p s i n & 3. H y d r o l y s i s o f m a l t o s e i n t o g l u c o s e . D . U r e a s e & 4. H y d r o l y s i s o f c a n e s u g a r . E . Z y m a s e & 5. H y d r o l y s i s o f p r o t e i n s i n t o p e p t i d e s . \end{matrix}$

Discussion

46.	kclo3 decomposes to form kcl and 02.if the volume of o2 obtained in this reaction is 1.12 l at stp,weight of kcl formed in this reaction
Answer» kclo3 decomposes to form kcl and 02.if the volume of o2 obtained in this reaction is 1.12 l at stp,weight of kcl formed in this reaction

Discussion

47.	. 25mL of N/10caustic soda solution exactly neutralises20mL of an acid solution containing7.875g ofacid per litre. Calculate the equivalent mass of the acid(A)25% (B)100% (C)50% (D)75%
Answer» . 25mL of N/10caustic soda solution exactly neutralises20mL of an acid solution containing7.875g of acid per litre. Calculate the equivalent mass of the acid (A)25% (B)100% (C)50% (D)75%

Discussion

48.	The number of isomer for the compound with molecular formula C2BrClFl is
Answer» The number of isomer for the compound with molecular formula $C_{2} B r C l F l is$

Discussion

49.	50.0 kg of N_2(g) and 10.0 kg of H_2(g). Calculate the NH_3(g) formed
Answer» 50.0 kg of N_2(g) and 10.0 kg of H_2(g). Calculate the NH_3(g) formed

Discussion

50.	A microphone of cross-sectional area 0.80cm2 is placed in front of a small speaker emitting 3.0W of sound output. If the distance between the microphone and the speaker is 2m, how much energy falls on the microphone in 5.0s?
Answer» A microphone of cross-sectional area $0.80 c m^{2}$ is placed in front of a small speaker emitting $3.0 W$ of sound output. If the distance between the microphone and the speaker is $2 m$ , how much energy falls on the microphone in $5.0 s$ ?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

At 0∘C and 2.00 atm partial pressure of oxygen, the aqueous solubility of O2(g) is 60.2 mL O2 per litre. Thus, molarity of O2 in a saturated water solution when the O2 is under the normal partial pressure of 0.3024 atm is

The degree of dissociation of I2(iodine gas) molecule of 1000^°C and under atmospheric pressure is 40% by volume. If dissociation is reduced to 20% at the same temperature, total equilibrium pressure on the gas is (a) 1.57 atm (b) 2.57 atm (c)3.57 (d) 4.57 atm

Write two situations when fire can not be controlled using water.

16. The table shown below gives the bond dissociation energies (E diss) for single covalent bonds of carbon (c) atoms with element A, B ,Z and D .Which element has the smallest atoms ? (1) Z (2) D (3) A (4) B

Why Conductivity decreases with concentration ?

Following phenomena occurs due to the presence of ________.

A dye emits 75% of the absorbed energy as fluorescence. The number of quanta absorbed and emitted out are in the ratio 2:3. Find the wavelength of the emitted radiation if the absorbed radiation has a wavelength of x oA.

In the electrolysis of acidified water:(a) Name the gas collected at (i) anode, and (ii) cathode(b) Why is the volume of gas collected at one electrode double than that at the other electrode?​(c) What would happen if dilute sulphuric acid is not added to water?

Zeolite used to soften hardness of water is hydrated.

A crystalline salt when heated becomes anhydrous and loses 51.2% of its weight. The anhydrous salt on analysis gave the percentage composition as Mg-20.0% S-26.66% and O-53.33% Calculate the molecular formula of the anhydrous salt and the crystalline salt. Molecular mass of anhydrous salt is 120

14. Titanium crystallizes in a face centred cubic latticeIt reacts with carbon or hydrogen interstitially byallowing atoms of these elements to occupy holesin the host lattice. Hydrogen occupies tetrahedralholes but carbon occupies octahedral holes theformula of titanium carbide and hydride are

A compound X formed after heating coke with lime react with water to give Y which on passing over red-hot iron at 873 produces Z. The compound Z is

What is the unit for entropy change?

what is significant figures ?

If an electron in a hydrogen atom (ground state) absorbs a photon of 12.1 eV, then change in angular momentum of electron is

Question 20.1Explain the following term with one example: Corrosion.

What is the value of Z ( rank ) for Diamond?

explain in breif about soil,air,tip&serpantine layering?

Predict conditions under which Al might be expected to reduce MgO.

Compounds having the same molecular formula but a difference in their functional groups are known as

Complétez avec les articles partitifs.

Propene when heated with chlorine at about 500∘C forms

Half - lives of decomposition of NH3 on the surface of a catalyst for different initial pressures are given as :p(torr) 200 300 500t1.2(min) 10 15 25The order of the reaction is :

Why has the use of methods like Teflon coating become more common?

Ionic hydride reacts with water to give:

The entropy change when two moles of an ideal monoatomic gas is heated from 200∘C to 300∘C reversibly and isochorically?

how many lone pair are and bond pair are there in so3. is there any short trick to find lone pair and bond pair

Why hybridization of C in C3O2 is sp

Which of the following represents an heterogenous equilibrium?

& AllMS16. For a certain gas the ratio of specific heats is givento be y = 1.5. Foi this gas3R(2) Cp3R(1) CyJ5R5R(4) C(3) СpJ

Which of the following aqueous solutions can act as an acidic buffer?

what is the product of reaction benzene with chloroiodide(CLI)? orC6H6+CL

Identify the chiral molecule in the following pair:

What is the effect of elctron releasing group and electron withdrawing group in coupling rxn of benzene diazoniumhalide?

11 A given metal crystalises out with a cubic structure having edge lenght of 361pm. If there are four metal atom in one unit cell, what is the radius of one atom?

How many structural isomers are there of dimethylcyclohexane

In polyatomic molecules the term mean or average bond enthalpy is used. It is calculated by dividing the total bond dissociation enthalpy by?

ate the atomic and ionic mass on an element same? plese explain.

The value of a function f(x) are tabulated below x0123f(x)12110Using Newton's forward difference formula, the cubic polynomial that can be fitted to the above data, is

State the role of silica in the metallurgy of copper .

kclo3 decomposes to form kcl and 02.if the volume of o2 obtained in this reaction is 1.12 l at stp,weight of kcl formed in this reaction

. 25mL of N/10caustic soda solution exactly neutralises20mL of an acid solution containing7.875g ofacid per litre. Calculate the equivalent mass of the acid(A)25% (B)100% (C)50% (D)75%

The number of isomer for the compound with molecular formula C2BrClFl is

50.0 kg of N_2(g) and 10.0 kg of H_2(g). Calculate the NH_3(g) formed

A microphone of cross-sectional area 0.80cm2 is placed in front of a small speaker emitting 3.0W of sound output. If the distance between the microphone and the speaker is 2m, how much energy falls on the microphone in 5.0s?

In the electrolysis of acidified water:(a) Name the gas collected at (i) anode, and (ii) cathode(b) Why is the volume of gas collected at one electrode double than that at the other electrode?(c) What would happen if dilute sulphuric acid is not added to water?