46295 + Interview Questions in Chemistry

1.	There are 1 mole of atoms of an element A. When half of the atoms transfer one electron to another atom, 405 kJmol−1 of energy was found to be consumed. An additional energy of 745 kJ/mol was further required to convert all the A− ions to A+. Calculate the ionisation energy of atom A in kJ
Answer» There are 1 mole of atoms of an element A. When half of the atoms transfer one electron to another atom, 405 $k J m o l^{- 1}$ of energy was found to be consumed. An additional energy of 745 $k J / m o l$ was further required to convert all the $A^{-}$ ions to $A^{+}$ . Calculate the ionisation energy of atom A in $k J$

Discussion

2.	The product X and Y are respectively:
Answer» The product X and Y are respectively:

Discussion

3.	what is R inverse { i.e. R to power -1} in relation chapter
Answer» what is R inverse { i.e. R to power -1} in relation chapter

Discussion

4.	0.004 M Na2SO4 is isotonic with 0.01 M glucose. Degree of dissociation of Na2SO4 is:
Answer» $0.004 M N a_{2} S O_{4}$ is isotonic with $0.01 M$ glucose. Degree of dissociation of $N a_{2} S O_{4}$ is:

Discussion

5.	Question 51 What is meant by the term average bond enthalpy? Why is there difference in bond enthlpy of O - H bond in ethanol (C2H5OH) and water?
Answer» Question 51 What is meant by the term average bond enthalpy? Why is there difference in bond enthlpy of O - H bond in ethanol $(C_{2} H_{5} O H)$ and water?

5.

Question 51 What is meant by the term average bond enthalpy? Why is there difference in bond enthlpy of O - H bond in ethanol (C2H5OH) and water?

Answer»

Question 51

What is meant by the term average bond enthalpy? Why is there difference in bond enthlpy of O - H bond in ethanol $(C_{2} H_{5} O H)$ and water?

Discussion

6.	238U decays to 206Pb with a half-life of 4.47×109. This happens in a number of steps. Can you justify a single half-life for this chain of process ? A sample of rock is found to contain 2.00 mg of 238U and 0.600 mg of 206Pb. Assuming that all the lead has come from uranium, find the life of the rock.
Answer» $^{238} U$ decays to $^{206} Pb$ with a half-life of $4.47 \times 10^{9}$ . This happens in a number of steps. Can you justify a single half-life for this chain of process ? A sample of rock is found to contain 2.00 mg of $^{238} U$ and 0.600 mg of $^{206} Pb$ . Assuming that all the lead has come from uranium, find the life of the rock.

Discussion

7.	In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the coreect answer out of the following choices. (a) Both assertion and reason are true and reason is the coreect explanation of assertion. (b) Both assertion and reason are true but reason is not the correct explanation of assertion. (c) Assertion is true but reason is false. (d) Assertion is false but reason is true. (e) Assertion and reason both are wrong. Assertion (A) Nickel can be purified by Mond's process. Reason (R) Ni (CO)4 is volatile compound which decomposes at 460 K to give pure Ni.
Answer» In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the coreect answer out of the following choices. (a) Both assertion and reason are true and reason is the coreect explanation of assertion. (b) Both assertion and reason are true but reason is not the correct explanation of assertion. (c) Assertion is true but reason is false. (d) Assertion is false but reason is true. (e) Assertion and reason both are wrong. Assertion (A) Nickel can be purified by Mond's process. Reason (R) Ni $(C O)_{4}$ is volatile compound which decomposes at 460 K to give pure Ni.

Discussion

8.	XdiH2SO4−−−−−→boiYZndust−−−−→ΔQ if one mole Y on ozonolysis yields three moles of ethan dial, X and Q respectively are
Answer» $X d i H_{2} S O_{4} - ---- \to b o i Y Z n d u s t - --- \to Δ Q$ if one mole Y on ozonolysis yields three moles of ethan dial, X and Q respectively are

Discussion

9.	NH4Cl crystallises in BCC with unit length 387pm. Find distance between oppositely charged ions
Answer» NH₄Cl crystallises in BCC with unit length 387pm. Find distance between oppositely charged ions

9.

NH4Cl crystallises in BCC with unit length 387pm. Find distance between oppositely charged ions

Answer»

NH₄Cl crystallises in BCC with unit length 387pm.

Find distance between oppositely charged ions

Discussion

10.	Ortho-chloro phenol is less polar than O-fluoro phenol. Why?
Answer» Ortho-chloro phenol is less polar than O-fluoro phenol. Why?

Discussion

11.	Which of the following reactions involves oxidation-reduction
Answer» Which of the following reactions involves oxidation-reduction

11.

Which of the following reactions involves oxidation-reduction

Answer»

Which of the following reactions involves oxidation-reduction

Discussion

12.	Write the formula of the compound of sulphur which is obtained when conc.HNO3 oxidises S8
Answer» Write the formula of the compound of sulphur which is obtained when $c o n c . H N O_{3}$ oxidises $S_{8}$

Discussion

13.	Calculate the maximum mass (in g) of AgBr precipitate that will be formed when 0.2 mol of the starting material is taken in the above reaction? (Molar mass of AgBr=188 g/mol)
Answer» Calculate the maximum mass (in g) of $A g B r$ precipitate that will be formed when 0.2 mol of the starting material is taken in the above reaction? (Molar mass of $A g B r$ =188 g/mol)

Discussion

14.	Aniline when treated with HNO2 and HCl at 0o Celsius gives [CPMT 1982, 89; RPMT 2000]
Answer» Aniline when treated with $H N O_{2}$ and $H C l$ at $0^{o}$ Celsius gives [CPMT 1982, 89; RPMT 2000]

14.

Aniline when treated with HNO2 and HCl at 0o Celsius gives [CPMT 1982, 89; RPMT 2000]

Answer»

Aniline when treated with $H N O_{2}$ and $H C l$ at $0^{o}$ Celsius gives

[CPMT 1982, 89; RPMT 2000]

Discussion

15.	Keto-enol tautomerism is observed in :
Answer» Keto-enol tautomerism is observed in :

Discussion

16.	2.0 molar solution in obtained, when 0.5 mole solute in dissolved in
Answer» 2.0 molar solution in obtained, when 0.5 mole solute in dissolved in

Discussion

17.	Question 42 (a) Explain the following phenomena with the help of Henry's Law. (i) Painful condition known as bends. (ii) Feeling of weakness and discomfort in breathing at high altitude. (b) Why soda water bottle kept at room temperature fizzes on opening/
Answer» Question 42 (a) Explain the following phenomena with the help of Henry's Law. (i) Painful condition known as bends. (ii) Feeling of weakness and discomfort in breathing at high altitude. (b) Why soda water bottle kept at room temperature fizzes on opening/

Discussion

18.	Which is not colloidal [CPMT 1984; MP PET 1989, 91]
Answer» Which is not colloidal [CPMT 1984; MP PET 1989, 91]

Discussion

19.	The hybridizations of the cation and the anion respectively, when PCl5 exists as a solid are:
Answer» The hybridizations of the cation and the anion respectively, when $P C l_{5}$ exists as a solid are:

Discussion

20.	Why axial bonds are larger than equatorial bonds??
Answer» Why axial bonds are larger than equatorial bonds??

Discussion

21.	The product B is:
Answer» The product B is:

Discussion

22.	Standard electrode potential of 4 elements A= -3.05 b= -1.66 C= -0.40 D= +0.80 The highest chemical reactivity will be exhibited by? [Pls explain the Concept and answer]
Answer» Standard electrode potential of 4 elements A= -3.05 b= -1.66 C= -0.40 D= +0.80 The highest chemical reactivity will be exhibited by? [Pls explain the Concept and answer]

22.

Standard electrode potential of 4 elements A= -3.05 b= -1.66 C= -0.40 D= +0.80 The highest chemical reactivity will be exhibited by? [Pls explain the Concept and answer]

Answer»

Standard electrode potential of 4 elements

A= -3.05

b= -1.66

C= -0.40

D= +0.80

The highest chemical reactivity will be exhibited by?

[Pls explain the Concept and answer]

Discussion

23.	A sample of ammonium phosphate (NH4)3PO4 contains 3.18 mol of hydrogen atoms. The number of moles of oxygen atoms in the sample is:
Answer» A sample of ammonium phosphate $(N H_{4})_{3} P O_{4}$ contains $3.18 m o l$ of hydrogen atoms. The number of moles of oxygen atoms in the sample is:

Discussion

24.	Why are rubber called elastomers ?
Answer» Why are rubber called elastomers ?

Discussion

25.	Which of the following molecules has the lowest bond angle?
Answer» Which of the following molecules has the lowest bond angle?

Discussion

26.	Is there any truth in saying that white objects are more prone to lightning
Answer» Is there any truth in saying that white objects are more prone to lightning

Discussion

27.	So, I am not expert in ISOMERISM but after listening to my tacher I have come to the point that. Suppose I have the compound CH3 CH2 -O- CH2 CH3 then can I say that it is Metamer of following two compound: CH3 -O- CH2 CH2 CH3 AND CH3 CH2 CH2 -O- CH3 I asked this question to my friends when we came out of our chemistry class. Some of them said me that they will tell me after reading the book and some told me that It is a STUPID question. I will read the book only after your answer beacause I want to know that what is level of my brain of asking questions without studying book. Do really this question is STUPID or really I am intelligent boy?
Answer» So, I am not expert in ISOMERISM but after listening to my tacher I have come to the point that. Suppose I have the compound CH3 CH2 -O- CH2 CH3 then can I say that it is Metamer of following two compound: CH3 -O- CH2 CH2 CH3 AND CH3 CH2 CH2 -O- CH3 I asked this question to my friends when we came out of our chemistry class. Some of them said me that they will tell me after reading the book and some told me that It is a STUPID question. I will read the book only after your answer beacause I want to know that what is level of my brain of asking questions without studying book. Do really this question is STUPID or really I am intelligent boy?

27.

So, I am not expert in ISOMERISM but after listening to my tacher I have come to the point that. Suppose I have the compound CH3 CH2 -O- CH2 CH3 then can I say that it is Metamer of following two compound: CH3 -O- CH2 CH2 CH3 AND CH3 CH2 CH2 -O- CH3 I asked this question to my friends when we came out of our chemistry class. Some of them said me that they will tell me after reading the book and some told me that It is a STUPID question. I will read the book only after your answer beacause I want to know that what is level of my brain of asking questions without studying book. Do really this question is STUPID or really I am intelligent boy?

Answer»

So, I am not expert in ISOMERISM but after listening to my tacher I have come to the point that. Suppose I have the compound

CH3 CH2 -O- CH2 CH3

then can I say that it is Metamer of following two compound:

CH3 -O- CH2 CH2 CH3 AND

CH3 CH2 CH2 -O- CH3

I asked this question to my friends when we came out of our chemistry class. Some of them said me that they will tell me after reading the book and some told me that It is a STUPID question.

I will read the book only after your answer beacause I want to know that what is level of my brain of asking questions without studying book.

Do really this question is STUPID or really I am intelligent boy?

Discussion

28.	10ml of concentrated H2SO4 (18M) is diluted to one litre. The approximate strength of the dilute acid is (1)18 M (2)180 M (3)0.18 M (4)1.8M
Answer» 10ml of concentrated H₂SO₄(18M) is diluted to one litre. The approximate strength of the dilute acid is (1)18 M (2)180 M (3)0.18 M (4)1.8M

28.

10ml of concentrated H2SO4 (18M) is diluted to one litre. The approximate strength of the dilute acid is (1)18 M (2)180 M (3)0.18 M (4)1.8M

Answer»

10ml of concentrated H₂SO₄(18M) is diluted to one litre. The approximate strength of the dilute acid is

(1)18 M (2)180 M (3)0.18 M (4)1.8M

Discussion

29.	Which of the following does not contain a peroxy bond?
Answer» Which of the following does not contain a peroxy bond?

Discussion

30.	pH of a saturated solution of Ba(OH)2 is 12. The value of solubility product (Ksp) of Ba(OH)2 is :
Answer» $p H$ of a saturated solution of $B a (O H)_{2}$ is $12$ . The value of solubility product $(K_{s p})$ of $B a (O H)_{2}$ is :

Discussion

31.	What is the major product of the following reaction sequence? HO−CH2−O\|\|C−OHSOCl2−−−−→excess CH3ONa−−−−−→1 eqv.
Answer» What is the major product of the following reaction sequence? $H O - C H_{2} - O \| \| C - O H S O C l_{2} - --- \to excess C H_{3} O N a - ---- \to 1 eqv.$

Discussion

32.	STATEMENT-1 Molecularity has no meaning for a complex reaction. STATEMENT-2 Molecularity is defined only for Rate determining Step. Examine the statements carefully and mark the correct answer according to the instructions given below:
Answer» STATEMENT-1 Molecularity has no meaning for a complex reaction. STATEMENT-2 Molecularity is defined only for Rate determining Step. Examine the statements carefully and mark the correct answer according to the instructions given below:

Discussion

33.	In a saturated solution of the sparingly soluble strong electrolyte AgIO3 (Molecular mass = 283) the equilibrium which sets in is AgIO3(s)⇌Ag+(aq)+IO−3(aq) If the solubility product constant Ksp of AgIO3 at a given temperature is 1.0×10−8, what is the mass of AgIO3 contained in 100 ml of its saturated solution ?
Answer» In a saturated solution of the sparingly soluble strong electrolyte $A g I O_{3}$ (Molecular mass = 283) the equilibrium which sets in is $A g I O_{3} (s) ⇌ A g^{+} (a q) + I O_{3}^{-} (a q)$ If the solubility product constant $K_{s p}$ of $A g I O_{3}$ at a given temperature is $1.0 \times 10^{- 8}$ , what is the mass of $A g I O_{3}$ contained in 100 ml of its saturated solution ?

Discussion

34.	The order of reactivity of the following substrates in a nucleophilic addition reaction is:
Answer» The order of reactivity of the following substrates in a nucleophilic addition reaction is:

Discussion

35.	In the reaction, product (S) would be:
Answer» In the reaction, product (S) would be:

Discussion

36.	Consider the following transformations. H−C≡C−CH2−CH2−CH3→H3C−CH=CH−CH2−CH3 Which reaction sequence will bring about the above transformation?
Answer» Consider the following transformations. $H - C \equiv C - C H_{2} - C H_{2} - C H_{3} \to H_{3} C - C H = C H - C H_{2} - C H_{3}$ Which reaction sequence will bring about the above transformation?

Discussion

37.	Why H2O is a liquid while H2S is a gas
Answer» Why H2O is a liquid while H2S is a gas

Discussion

38.	The forward reaction proceeds towards near completion if the equilibrium constant of a reaction is:
Answer» The forward reaction proceeds towards near completion if the equilibrium constant of a reaction is:

Discussion

39.	Which of the following compounds will form a hydrocarbon on reaction with Grignard reagent
Answer» Which of the following compounds will form a hydrocarbon on reaction with Grignard reagent

Discussion

40.	Which pair of quantum numbers determine the energy of an electron in an orbital?
Answer» Which pair of quantum numbers determine the energy of an electron in an orbital?

Discussion

41.	During dehydration of alcohols to alkenes by heating with conc. H2SO4, the initiation step is
Answer» During dehydration of alcohols to alkenes by heating with conc. $H_{2} S O_{4}$ , the initiation step is

Discussion

42.	How to memorize the colour of all the salts????
Answer» How to memorize the colour of all the salts????

Discussion

43.	Why are pentahalides more covalent than trihalides ?
Answer» Why are pentahalides more covalent than trihalides ?

Discussion

44.	CH3COCl+H2------->CH3CH2OH------->CH3CHO(in presence of pd,BaSO4 and quinoline). Here quinoline acts as what? a)+ve catalyst b)catalyst poison c)promoter d)medium
Answer» CH3COCl+H2------->CH3CH2OH------->CH3CHO(in presence of pd,BaSO4 and quinoline). Here quinoline acts as what? a)+ve catalyst b)catalyst poison c)promoter d)medium

44.

CH3COCl+H2------->CH3CH2OH------->CH3CHO(in presence of pd,BaSO4 and quinoline). Here quinoline acts as what? a)+ve catalyst b)catalyst poison c)promoter d)medium

Answer»

CH3COCl+H2------->CH3CH2OH------->CH3CHO(in presence of pd,BaSO4 and quinoline).

Here quinoline acts as what?

a)+ve catalyst

b)catalyst poison

c)promoter

d)medium

Discussion

45.	Order of a reaction can be:
Answer» Order of a reaction can be:

Discussion

46.	Mention the role of vectors in DNA technology. Give 2 examples?
Answer» Mention the role of vectors in DNA technology. Give 2 examples?

Discussion

47.	The rate of a first order reaction is 0.04mol/L/s at10minutes and 0.03mol/L/s at 20minutes after initiation. Find the half life of the reaction.
Answer» The rate of a first order reaction is 0.04mol/L/s at10minutes and 0.03mol/L/s at 20minutes after initiation. Find the half life of the reaction.

Discussion

48.	Find the dimensions of (a) the specific heat capacity c, (b) the coefficient of linear expansion α and (c) lthe gas constant R. Some of the equations involving these quatities are Q=mc(T2−T1), l1=l0[1+α(T2−T1)] and PV = nRT.
Answer» Find the dimensions of (a) the specific heat capacity c, (b) the coefficient of linear expansion $α$ and (c) lthe gas constant R. Some of the equations involving these quatities are $Q = m c (T_{2} - T_{1}), l_{1} = l_{0} [1 + α (T_{2} - T_{1})]$ and PV = nRT.

48.

Find the dimensions of (a) the specific heat capacity c, (b) the coefficient of linear expansion α and (c) lthe gas constant R. Some of the equations involving these quatities are Q=mc(T2−T1), l1=l0[1+α(T2−T1)] and PV = nRT.

Answer»

Find the dimensions of

(a) the specific heat capacity c,

(b) the coefficient of linear expansion $α$ and

(c) lthe gas constant R.

Some of the equations involving these quatities are $Q = m c (T_{2} - T_{1}), l_{1} = l_{0} [1 + α (T_{2} - T_{1})]$ and PV = nRT.

Discussion

49.	Two absolute scales A and b have triple point of water defined to be 200A and 350B. What is the relation between TA and TB ?
Answer» Two absolute scales A and b have triple point of water defined to be 200A and 350B. What is the relation between T_Aand T_B ?

Discussion

50.	The stream of electrons from a heated filament was passed between two charged plates kept at a potential difference of 2 V volts. If e and m are the charge and the mass of electron respectively, then the value of hλ is: (where λ is the de Broglie wavelength of the electron)
Answer» The stream of electrons from a heated filament was passed between two charged plates kept at a potential difference of $2 V$ volts. If e and m are the charge and the mass of electron respectively, then the value of $\frac{h}{λ}$ is: (where $λ$ is the de Broglie wavelength of the electron)

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

There are 1 mole of atoms of an element A. When half of the atoms transfer one electron to another atom, 405 kJmol−1 of energy was found to be consumed. An additional energy of 745 kJ/mol was further required to convert all the A− ions to A+. Calculate the ionisation energy of atom A in kJ

The product X and Y are respectively:

what is R inverse { i.e. R to power -1} in relation chapter

0.004 M Na2SO4 is isotonic with 0.01 M glucose. Degree of dissociation of Na2SO4 is:

Question 51 What is meant by the term average bond enthalpy? Why is there difference in bond enthlpy of O - H bond in ethanol (C2H5OH) and water?

XdiH2SO4−−−−−→boiYZndust−−−−→ΔQ if one mole Y on ozonolysis yields three moles of ethan dial, X and Q respectively are

NH​​​​​4​​​​Cl crystallises in BCC with unit length 387pm. Find distance between oppositely charged ions

Ortho-chloro phenol is less polar than O-fluoro phenol. Why?

Which of the following reactions involves oxidation-reduction

Write the formula of the compound of sulphur which is obtained when conc.HNO3 oxidises S8

Calculate the maximum mass (in g) of AgBr precipitate that will be formed when 0.2 mol of the starting material is taken in the above reaction? (Molar mass of AgBr=188 g/mol)

Aniline when treated with HNO2 and HCl at 0o Celsius gives [CPMT 1982, 89; RPMT 2000]

Keto-enol tautomerism is observed in :

2.0 molar solution in obtained, when 0.5 mole solute in dissolved in

Question 42 (a) Explain the following phenomena with the help of Henry's Law. (i) Painful condition known as bends. (ii) Feeling of weakness and discomfort in breathing at high altitude. (b) Why soda water bottle kept at room temperature fizzes on opening/

Which is not colloidal [CPMT 1984; MP PET 1989, 91]

The hybridizations of the cation and the anion respectively, when PCl5 exists as a solid are:

Why axial bonds are larger than equatorial bonds??

The product B is:

Standard electrode potential of 4 elements A= -3.05 b= -1.66 C= -0.40 D= +0.80 The highest chemical reactivity will be exhibited by? [Pls explain the Concept and answer]

A sample of ammonium phosphate (NH4)3PO4 contains 3.18 mol of hydrogen atoms. The number of moles of oxygen atoms in the sample is:

Why are rubber called elastomers ?

Which of the following molecules has the lowest bond angle?

Is there any truth in saying that white objects are more prone to lightning

10ml of concentrated H2SO4 (18M) is diluted to one litre. The approximate strength of the dilute acid is (1)18 M (2)180 M (3)0.18 M (4)1.8M

Which of the following does not contain a peroxy bond?

pH of a saturated solution of Ba(OH)2 is 12. The value of solubility product (Ksp) of Ba(OH)2 is :

What is the major product of the following reaction sequence? HO−CH2−O||C−OHSOCl2−−−−→excess CH3ONa−−−−−→1 eqv.

STATEMENT-1 Molecularity has no meaning for a complex reaction. STATEMENT-2 Molecularity is defined only for Rate determining Step. Examine the statements carefully and mark the correct answer according to the instructions given below:

The order of reactivity of the following substrates in a nucleophilic addition reaction is:

In the reaction, product (S) would be:

Consider the following transformations. H−C≡C−CH2−CH2−CH3→H3C−CH=CH−CH2−CH3 Which reaction sequence will bring about the above transformation?

Why H2O is a liquid while H2S is a gas

The forward reaction proceeds towards near completion if the equilibrium constant of a reaction is:

Which of the following compounds will form a hydrocarbon on reaction with Grignard reagent

Which pair of quantum numbers determine the energy of an electron in an orbital?

During dehydration of alcohols to alkenes by heating with conc. H2SO4, the initiation step is

How to memorize the colour of all the salts????

Why are pentahalides more covalent than trihalides ?

CH3COCl+H2-------&gt;CH3CH2OH-------&gt;CH3CHO(in presence of pd,BaSO4 and quinoline). Here quinoline acts as what? a)+ve catalyst b)catalyst poison c)promoter d)medium

Order of a reaction can be:

Mention the role of vectors in DNA technology. Give 2 examples?

The rate of a first order reaction is 0.04mol/L/s at10minutes and 0.03mol/L/s at 20minutes after initiation. Find the half life of the reaction.

Find the dimensions of (a) the specific heat capacity c, (b) the coefficient of linear expansion α and (c) lthe gas constant R. Some of the equations involving these quatities are Q=mc(T2−T1), l1=l0[1+α(T2−T1)] and PV = nRT.

Two absolute scales A and b have triple point of water defined to be 200A and 350B. What is the relation between TA and TB ?

The stream of electrons from a heated filament was passed between two charged plates kept at a potential difference of 2 V volts. If e and m are the charge and the mass of electron respectively, then the value of hλ is: (where λ is the de Broglie wavelength of the electron)

NH4Cl crystallises in BCC with unit length 387pm. Find distance between oppositely charged ions

CH3COCl+H2------->CH3CH2OH------->CH3CHO(in presence of pd,BaSO4 and quinoline). Here quinoline acts as what? a)+ve catalyst b)catalyst poison c)promoter d)medium