46295 + Interview Questions in Chemistry

1.	Ketones react with dimethylsulfonium methylide to yield epoxides. Suggest a mechanism for the reaction.? Assume, the substrate is cyclohexanone and choose the correct options :
Answer» Ketones react with dimethylsulfonium methylide to yield epoxides. Suggest a mechanism for the reaction.? Assume, the substrate is cyclohexanone and choose the correct options :

Discussion

2.	Write the mechanism of the reaction of HI with methoxymethane.
Answer» Write the mechanism of the reaction of HI with methoxymethane.

Discussion

3.	A mixture of carbon dioxide and carbon monoxide is found to have a density of 1.5 gram per litre at 30 degree temperature at 730 torr pressure. Calculate the mole percentage of the component gases in the mixture.
Answer» A mixture of carbon dioxide and carbon monoxide is found to have a density of 1.5 gram per litre at 30 degree temperature at 730 torr pressure. Calculate the mole percentage of the component gases in the mixture.

Discussion

4.	ClF3 hybridisation
Answer» ClF3 hybridisation

Discussion

5.	Butane – 2 – ol is a
Answer» Butane – 2 – ol is a

Discussion

6.	Which of the following is not a pair of enantiomers?
Answer» Which of the following is not a pair of enantiomers?

Discussion

7.	How was Neil's Bohr able to explain the origin of discontinuous line spectrum in case of hydrogen atom?
Answer» How was Neil's Bohr able to explain the origin of discontinuous line spectrum in case of hydrogen atom?

Discussion

8.	10.The difference between number of shared electron pairs and unpaired electrons in NH3 is ?? a) 4 b) 2 c) 0 d) 3
Answer» 10.The difference between number of shared electron pairs and unpaired electrons in NH3 is ?? a) 4 b) 2 c) 0 d) 3

Discussion

9.	Which of the following is not a Doebereiner triad-
Answer» Which of the following is not a Doebereiner triad-

Discussion

10.	Match the elements given in List - I with their correct option given in List - II. List-IList - IIP.4.5 m solution of CaCO3 of density 1.45 g/mL1.mole fraction of solute is 0.2Q.3 M 100 mL HCl mixed with 1 M 300 mL solution of HCl2.Molarity = 1.5 MR.14.5 m solution of Ca2+3.Molarity = 4.5 MS.5 m NaOH solution4.16.66 % w/w of NaOH in the solution
Answer» Match the elements given in List - I with their correct option given in List - II. $List-IList - IIP.4.5 m solution of CaCO3 of density 1.45 g/mL1.mole fraction of solute is 0.2Q.3 M 100 mL HCl mixed with 1 M 300 mL solution of HCl2.Molarity = 1.5 MR.14.5 m solution of Ca2+3.Molarity = 4.5 MS.5 m NaOH solution4.16.66 % w/w of NaOH in the solution$

Discussion

11.	The systematic (IUPAC) name of tertiary butyl chloride is:
Answer» The systematic (IUPAC) name of tertiary butyl chloride is:

Discussion

12.	2. suppose in a particular structure there is presence of 2 carbon atoms.there exists a single bond between them but one of the carbon forms double bond with oxygen. so what will be the hybrid state of that carbon which is bonded to oxygen??
Answer» 2. suppose in a particular structure there is presence of 2 carbon atoms.there exists a single bond between them but one of the carbon forms double bond with oxygen. so what will be the hybrid state of that carbon which is bonded to oxygen??

Discussion

13.	When 100 mL of 0.4 M CH3COOH is mixed with 100 mL of 0.2 M NaOH, the approximate value of [H3O+] in the solution mixture is? [Ka(CH3COOH)=1.8×10−5]
Answer» When $100 mL$ of $0.4 M C H_{3} C O O H$ is mixed with $100 mL$ of $0.2 M N a O H$ , the approximate value of $[H_{3} O^{+}]$ in the solution mixture is? $[K_{a} (C H_{3} C O O H) = 1.8 \times 10^{- 5}]$

Discussion

14.	An element of a certain material in plane strain has εx=800×10−6 εy=400×10−6 γxy=300×10−6What is the maximum shearing strain?
Answer» An element of a certain material in plane strain has $ε_{x} = 800 \times 10^{- 6}$ $ε_{y} = 400 \times 10^{- 6}$ $γ_{x y} = 300 \times 10^{- 6}$ What is the maximum shearing strain?

14.

An element of a certain material in plane strain has εx=800×10−6 εy=400×10−6 γxy=300×10−6What is the maximum shearing strain?

Answer»

An element of a certain material in plane strain has

$ε_{x} = 800 \times 10^{- 6}$

$ε_{y} = 400 \times 10^{- 6}$

$γ_{x y} = 300 \times 10^{- 6}$

What is the maximum shearing strain?

Discussion

15.	The number of unit cells possible in monoclinic crystal system is
Answer» The number of unit cells possible in monoclinic crystal system is

Discussion

16.	59, A hypothetical reaction A2 + B2→ 2 ABfollows the mechanism as given below:A2 A +A (fast)A + B2 → AB + B (slow)A + B → AB (fast)The order of the over all reaction is
Answer» 59, A hypothetical reaction A2 + B2→ 2 ABfollows the mechanism as given below:A2 A +A (fast)A + B2 → AB + B (slow)A + B → AB (fast)The order of the over all reaction is

Discussion

17.	According to Bronsted - Lowry's Acids and Bases concept, select the species which can act as an acid as well as a base ?
Answer» According to Bronsted - Lowry's Acids and Bases concept, select the species which can act as an acid as well as a base ?

Discussion

18.	Mention the hazards of working in the glass bangles industry.
Answer» Mention the hazards of working in the glass bangles industry.

Discussion

19.	Very pure hydrogen (99.9) can be made by which of the following processes?
Answer» Very pure hydrogen (99.9) can be made by which of the following processes?

Discussion

20.	Why are crystalline anisotropic ? Give reasons
Answer» Why are crystalline anisotropic ? Give reasons

Discussion

21.	25. 1) What are the orbital angular momentum values of electrons in 2p and 3p orbitals in hydrogen atom?
Answer» 25. 1) What are the orbital angular momentum values of electrons in 2p and 3p orbitals in hydrogen atom?

Discussion

22.	How does the presence of an electron withdrawing group or an electron releasing group effect the ease of dehydration of an alcohol?
Answer» How does the presence of an electron withdrawing group or an electron releasing group effect the ease of dehydration of an alcohol?

Discussion

23.	AB has NaCl type ideal structure .If edge length of crystal lattice is 282Armstrong. The radius of A+ is
Answer» AB has NaCl type ideal structure .If edge length of crystal lattice is 282Armstrong. The radius of A+ is

Discussion

24.	36. The standard electrode potential for the following redox couples are given as E_{(Fe^{2+}/Fe)}=xV,E_{(Fe^{3+}/Fe^{2+})}=yV. The potential E_{ (Fe^{3+}/Fe)} in V will be 1)2x+y 2)x+y .3)x+2y/3. 4) 2x+y/3
Answer» 36. The standard electrode potential for the following redox couples are given as E_{(Fe^{2+}/Fe)}=xV,E_{(Fe^{3+}/Fe^{2+})}=yV. The potential E_{ (Fe^{3+}/Fe)} in V will be 1)2x+y 2)x+y .3)x+2y/3. 4) 2x+y/3

Discussion

25.	Diazomethane reacts with acid chloride followed by Ag2o and hydrolysis to produce
Answer» Diazomethane reacts with acid chloride followed by Ag2o and hydrolysis to produce

Discussion

26.	In which of the following, oxygen is not in +2 oxidation state?
Answer» In which of the following, oxygen is not in $+ 2$ oxidation state?

Discussion

27.	Identify the type of reaction(s) in the following equations.(i)CH4+2O2→CO2+2H2O(ii) Pb(NO3)2+2KI→Pbl2+2KNO3(iii) CaO+H2O→Ca(OH)2(iv) CuSO4+Zn→ZnSO4+Cu
Answer» Identify the type of reaction(s) in the following equations. $(i) C H_{4} + 2 O_{2} \to C O_{2} + 2 H_{2} O$ $(ii) P b (N O_{3}) 2 + 2 K I \to P b l_{2} + 2 K N O_{3}$ $(iii) C a O + H_{2} O \to C a (O H)_{2}$ $(iv) C u S O_{4} + Z n \to Z n S O_{4} + C u$

Discussion

28.	In a trigonsl bipyramaidal MX5 the number of X--- M---X bonds at 90 degree is
Answer» In a trigonsl bipyramaidal MX5 the number of X--- M---X bonds at 90 degree is

Discussion

29.	Calculate the number of formula units of [Ag(NH3)2]Cl in 1 kilomole of [Ag(NH3)2]Cl.
Answer» Calculate the number of formula units of $[A g (N H_{3})_{2}] C l$ in 1 kilomole of $[A g (N H_{3})_{2}] C l$ .

Discussion

30.	Normality of 2M sulphuric acid is
Answer» Normality of 2M sulphuric acid is

Discussion

31.	In polymeric (BeCl2)n, there are:(1) 3C-4e bonds(2) 3C-3e bonds(3) 2C-3e bonds(4) 2C-2e bonds
Answer» In polymeric (BeCl2)n, there are:(1) 3C-4e bonds(2) 3C-3e bonds(3) 2C-3e bonds(4) 2C-2e bonds

Discussion

32.	explain why pure liquids and solids can be ignored while writing the equlibrium cons†an t expression ?
Answer» explain why pure liquids and solids can be ignored while writing the equlibrium cons†an t expression ?

Discussion

33.	In a lithium ion Li2+, an orbit has a diameter of about 3.18 ∘A. What is the maximum number of electrons that can be accommodated in this orbit?
Answer» In a lithium ion $L i^{2 +}$ , an orbit has a diameter of about $3.18 \circ A$ . What is the maximum number of electrons that can be accommodated in this orbit?

Discussion

34.	An element is represented by ZXA, where Z is atomic number which is also equal to number of proton, A is mass number and X is symbol of the element. Mass number (A) = Number of protons (Z) + Number of neutrons. Isotopes: Atoms having same number of proton Isobar: Elements having same mass number Isotones: Elements having same number of neutron (A-Z) Which of the following is a pair of isobar?
Answer» An element is represented by $_{Z} X^{A}$ , where Z is atomic number which is also equal to number of proton, A is mass number and X is symbol of the element. Mass number (A) = Number of protons (Z) + Number of neutrons. Isotopes: Atoms having same number of proton Isobar: Elements having same mass number Isotones: Elements having same number of neutron (A-Z) Which of the following is a pair of isobar?

Discussion

35.	In ABAB close packing in 3-D, what are the types of voids present?
Answer» In ABAB close packing in 3-D, what are the types of voids present?

Discussion

36.	An example of auto-catalytic reaction
Answer» An example of auto-catalytic reaction

Discussion

37.	What is the concentration of H+ ions in 2M H2SO4 solution?
Answer» What is the concentration of H+ ions in 2M H2SO4 solution?

Discussion

38.	Phthalamide on strong heating forms
Answer» Phthalamide on strong heating forms

Discussion

39.	The coordination number of Al in AlCl3 is:
Answer» The coordination number of Al in AlCl3 is:

Discussion

40.	24. If the pH of a base is 14 at 25 C then on increasing temp to 35 C 1) ph will be more than 14 2) less than 14 3) equal to 14
Answer» 24. If the pH of a base is 14 at 25 C then on increasing temp to 35 C 1) ph will be more than 14 2) less than 14 3) equal to 14

Discussion

41.	what is the molality of 900 gms water
Answer» what is the molality of 900 gms water

Discussion

42.

Write these sentences in the correct order. Also, choose the right word from the box and add it before each sentence. Remember to put a comma after it, for example, Finally, ... FirstThenAfter thatFinally(a) It gave him its branches to make a house._____________________(b) It asked him to sit on the stump._(c) It gave him its trunk to make a boat._(d) The tree gave its apples to the boy._____________________

Answer»

Write these sentences in the correct order. Also, choose the right word from the box and add it before each sentence. Remember to put a comma after it, for example, Finally, ...

First

Then

After that

Finally

(a) It gave him its branches to make a house.

_________________________________________

(b) It asked him to sit on the stump.

_________________________________________

(c) It gave him its trunk to make a boat.

_________________________________________

(d) The tree gave its apples to the boy.

_________________________________________

Discussion

43.	Which one of the following is the correct formula of dichlorodiphenyl trichloroethane?
Answer» Which one of the following is the correct formula of dichlorodiphenyl trichloroethane?

Discussion

44.	Which of the following elements gain one electron more readily in comparison to other elements of the same group?
Answer» Which of the following elements gain one electron more readily in comparison to other elements of the same group?

Discussion

45.	1.70 g of a metal oxide required 933 mL of hydrogen at STP to be reduced to a pure metal. Find the equivalent weight of the metal.
Answer» $1.70 g$ of a metal oxide required $933 mL$ of hydrogen at STP to be reduced to a pure metal. Find the equivalent weight of the metal.

Discussion

46.	Total number of structural isomers form on monochlorination of isopentane is:
Answer» Total number of structural isomers form on monochlorination of isopentane is:

Discussion

47.	9 When 0.1 mole of N2O4(g) was placed in a 1 L flask at 400 K and closed ,the following equilibrium is reached with a total pressure of 6 bar N2O4(g) gives 2 NO2 (g).Assuming ideal behavior of the gases ,the partial pressure of N2O4( g) at equilibrium in bar is (R=0.083 bar L /mol K)
Answer» 9 When 0.1 mole of N2O4(g) was placed in a 1 L flask at 400 K and closed ,the following equilibrium is reached with a total pressure of 6 bar N2O4(g) gives 2 NO2 (g).Assuming ideal behavior of the gases ,the partial pressure of N2O4( g) at equilibrium in bar is (R=0.083 bar L /mol K)

Discussion

48.	The number of isomers possible for square planar complex K2[Pt(ClBr2SCN)] is:
Answer» The number of isomers possible for square planar complex $K_{2} [P t (C l B r_{2} S C N)]$ is:

Discussion

49.	Consider a weak monoacidic base BOH having a concentration C with dissociation α<<1. The pH of this weak base in terms of base dissociation constant Kb and concentration C is :
Answer» Consider a weak monoacidic base $B O H$ having a concentration C with dissociation $α << 1.$ The pH of this weak base in terms of base dissociation constant $K_{b}$ and concentration $C$ is :

Discussion

50.	Consider two reactions I. Zn + conc.HNO3 (hot) →Zn(NO3)2+X+H2O II. Zn + dil. HNO3 (cold) →Zn(NO3)2+Y+H2O Compounds X and Y are respectively:-
Answer» Consider two reactions I. Zn + conc. $H N O_{3}$ (hot) $\to Z n (N O_{3})_{2} + X + H_{2} O$ II. Zn + dil. $H N O_{3}$ (cold) $\to Z n (N O_{3})_{2} + Y + H_{2} O$ Compounds X and Y are respectively:-

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Ketones react with dimethylsulfonium methylide to yield epoxides. Suggest a mechanism for the reaction.? Assume, the substrate is cyclohexanone and choose the correct options :

Write the mechanism of the reaction of HI with methoxymethane.

A mixture of carbon dioxide and carbon monoxide is found to have a density of 1.5 gram per litre at 30 degree temperature at 730 torr pressure. Calculate the mole percentage of the component gases in the mixture.

ClF3 hybridisation

Butane – 2 – ol is a

Which of the following is not a pair of enantiomers?

How was Neil's Bohr able to explain the origin of discontinuous line spectrum in case of hydrogen atom?

10.The difference between number of shared electron pairs and unpaired electrons in NH3 is ?? a) 4 b) 2 c) 0 d) 3

Which of the following is not a Doebereiner triad-

The systematic (IUPAC) name of tertiary butyl chloride is:

2. suppose in a particular structure there is presence of 2 carbon atoms.there exists a single bond between them but one of the carbon forms double bond with oxygen. so what will be the hybrid state of that carbon which is bonded to oxygen??

When 100 mL of 0.4 M CH3COOH is mixed with 100 mL of 0.2 M NaOH, the approximate value of [H3O+] in the solution mixture is? [Ka(CH3COOH)=1.8×10−5]

An element of a certain material in plane strain has εx=800×10−6 εy=400×10−6 γxy=300×10−6What is the maximum shearing strain?

The number of unit cells possible in monoclinic crystal system is

59, A hypothetical reaction A2 + B2→ 2 ABfollows the mechanism as given below:A2 A +A (fast)A + B2 → AB + B (slow)A + B → AB (fast)The order of the over all reaction is

According to Bronsted - Lowry's Acids and Bases concept, select the species which can act as an acid as well as a base ?

Mention the hazards of working in the glass bangles industry.

Very pure hydrogen (99.9) can be made by which of the following processes?

Why are crystalline anisotropic ? Give reasons

25. 1) What are the orbital angular momentum values of electrons in 2p and 3p orbitals in hydrogen atom?

How does the presence of an electron withdrawing group or an electron releasing group effect the ease of dehydration of an alcohol?

AB has NaCl type ideal structure .If edge length of crystal lattice is 282Armstrong. The radius of A+ is

36. The standard electrode potential for the following redox couples are given as E_{(Fe^{2+}/Fe)}=xV,E_{(Fe^{3+}/Fe^{2+})}=yV. The potential E_{ (Fe^{3+}/Fe)} in V will be 1)2x+y 2)x+y .3)x+2y/3. 4) 2x+y/3

Diazomethane reacts with acid chloride followed by Ag2o and hydrolysis to produce

In which of the following, oxygen is not in +2 oxidation state?

Identify the type of reaction(s) in the following equations.(i)CH4+2O2→CO2+2H2O(ii) Pb(NO3)2+2KI→Pbl2+2KNO3(iii) CaO+H2O→Ca(OH)2(iv) CuSO4+Zn→ZnSO4+Cu

In a trigonsl bipyramaidal MX5 the number of X--- M---X bonds at 90 degree is

Calculate the number of formula units of [Ag(NH3)2]Cl in 1 kilomole of [Ag(NH3)2]Cl.

Normality of 2M sulphuric acid is

In polymeric (BeCl2)n, there are:(1) 3C-4e bonds(2) 3C-3e bonds(3) 2C-3e bonds(4) 2C-2e bonds

explain why pure liquids and solids can be ignored while writing the equlibrium cons†an t expression ?

In a lithium ion Li2+, an orbit has a diameter of about 3.18 ∘A. What is the maximum number of electrons that can be accommodated in this orbit?

In ABAB close packing in 3-D, what are the types of voids present?

An example of auto-catalytic reaction

What is the concentration of H+ ions in 2M H2SO4 solution?

Phthalamide on strong heating forms

The coordination number of Al in AlCl3 is:

24. If the pH of a base is 14 at 25 C then on increasing temp to 35 C 1) ph will be more than 14 2) less than 14 3) equal to 14

what is the molality of 900 gms water

Which one of the following is the correct formula of dichlorodiphenyl trichloroethane?

Which of the following elements gain one electron more readily in comparison to other elements of the same group?

1.70 g of a metal oxide required 933 mL of hydrogen at STP to be reduced to a pure metal. Find the equivalent weight of the metal.

Total number of structural isomers form on monochlorination of isopentane is:

9 When 0.1 mole of N2O4(g) was placed in a 1 L flask at 400 K and closed ,the following equilibrium is reached with a total pressure of 6 bar N2O4(g) gives 2 NO2 (g).Assuming ideal behavior of the gases ,the partial pressure of N2O4( g) at equilibrium in bar is (R=0.083 bar L /mol K)

The number of isomers possible for square planar complex K2[Pt(ClBr2SCN)] is:

Consider a weak monoacidic base BOH having a concentration C with dissociation α&lt;&lt;1. The pH of this weak base in terms of base dissociation constant Kb and concentration C is :

Consider two reactions I. Zn + conc.HNO3 (hot) →Zn(NO3)2+X+H2O II. Zn + dil. HNO3 (cold) →Zn(NO3)2+Y+H2O Compounds X and Y are respectively:-

Consider a weak monoacidic base BOH having a concentration C with dissociation α<<1. The pH of this weak base in terms of base dissociation constant Kb and concentration C is :