46295 + Interview Questions in Chemistry

1.	18. Stability order of carbanion in A. Ethyne carbanion B. Allyl carbanion C. Benzyl carbanion D. Tertiary carbanion
Answer» 18. Stability order of carbanion in A. Ethyne carbanion B. Allyl carbanion C. Benzyl carbanion D. Tertiary carbanion

Discussion

2.	Model a torch battery of length l to be made up of a thin cylindrical bar of radius a and a concentric thin cylindrical shell of radius b filled in between with an electrolyte of resistivity ρ (as shown in the figure). If the battery is connected to a resistance of value R, the maximum Joule's heating in R will take place for-
Answer» Model a torch battery of length $l$ to be made up of a thin cylindrical bar of radius $a$ and a concentric thin cylindrical shell of radius $b$ filled in between with an electrolyte of resistivity $ρ$ (as shown in the figure). If the battery is connected to a resistance of value $R$ , the maximum Joule's heating in $R$ will take place for-

Discussion

3.	Explain why alcohols and ethers of comparable molecular mass have different boiling points?
Answer» Explain why alcohols and ethers of comparable molecular mass have different boiling points?

Discussion

4.	A compound with formula AB2O4 adopts a crystal structure in which O2− ions forms ccp arrangement. A2+ ions occupy octahedral voids while B3+ ions are distributed equally between tetrahedral and octahedral voids. The fraction of octahedral and tetrahedral voids occupied respectively are:
Answer» A compound with formula $A B_{2} O_{4}$ adopts a crystal structure in which $O^{2 -}$ ions forms ccp arrangement. $A^{2 +}$ ions occupy octahedral voids while $B^{3 +}$ ions are distributed equally between tetrahedral and octahedral voids. The fraction of octahedral and tetrahedral voids occupied respectively are:

Discussion

5.	Among the following, the surfactant that will form micelles in an aqueous solution at the lowest molar concentration at the ambient condition is:
Answer» Among the following, the surfactant that will form micelles in an aqueous solution at the lowest molar concentration at the ambient condition is:

Discussion

6.	explain:mole fraction is independent of the temperature because it does not contains volume term.explain the term "volume term "also.
Answer» explain: mole fraction is independent of the temperature because it does not contains volume term. explain the term "volume term "also.

Discussion

7.	the maximum number of electron in an atom with quantum number n=3 ,l=2 i
Answer» the maximum number of electron in an atom with quantum number n=3 ,l=2 i

Discussion

8.	Ferrous oxide has a cubic structure and each edge of the unit cell is 5.0 angstrom. Assuming density of the oxide as 4.0 g/cm2, then find he number of Fe2+ and O2-ions present in each unit cell.
Answer» Ferrous oxide has a cubic structure and each edge of the unit cell is 5.0 angstrom. Assuming density of the oxide as 4.0 g/cm2, then find he number of Fe2+ and O2-ions present in each unit cell.

Discussion

9.

think this ten thin that top three thought tank

Answer»

think	this	ten
thin	that	top
three	thought	tank

Discussion

10.	Differentiate cos(sqrtx) w.r.t x using first principle.
Answer» Differentiate cos(sqrtx) w.r.t x using first principle.

Discussion

11.	Which one of the following can be made n-type semiconductor only when doped with some group 15 elements like P or As?
Answer» Which one of the following can be made n-type semiconductor only when doped with some group 15 elements like P or As?

Discussion

12.	Which of the following order of basic strength is correct?(1) NH3 < NH2OH < HN3 < NH2-NH2 (2) NH20H < HN3 < NH2- NH2 < NH3 (3) HN3 < NH3 < NH2OH < NH2-NH2 (4) HN3 < NH2OH < NH2 NH2 < NH3
Answer» Which of the following order of basic strength is correct?(1) NH3 < NH2OH < HN3 < NH2-NH2 (2) NH20H < HN3 < NH2- NH2 < NH3 (3) HN3 < NH3 < NH2OH < NH2-NH2 (4) HN3 < NH2OH < NH2 NH2 < NH3

Discussion

13.	In a reaction 3A+ B2 ⟶A3B2 if 180 atoms of A and 100 molecules of B react then1) B2 is limiting reagent and 100 molecules of A3B2 will be formed.2) A is limiting reagent and 60 molecules of A3B2 is formed3) A is limiting reagent and 180 molecules of A3B2 will be formed4) B is limiting reactant and 60 molecules of A3B2 will be formed.
Answer» In a reaction 3A+ $B_{2}$ $⟶ A_{3} B_{2}$ if 180 atoms of A and 100 molecules of B react then 1) $B_{2}$ is limiting reagent and 100 molecules of $A_{3} B_{2}$ will be formed. 2) A is limiting reagent and 60 molecules of $A_{3} B_{2}$ is formed 3) A is limiting reagent and 180 molecules of $A_{3} B_{2}$ will be formed 4) B is limiting reactant and 60 molecules of $A_{3} B_{2}$ will be formed.

13.

In a reaction 3A+ B2 ⟶A3B2 if 180 atoms of A and 100 molecules of B react then1) B2 is limiting reagent and 100 molecules of A3B2 will be formed.2) A is limiting reagent and 60 molecules of A3B2 is formed3) A is limiting reagent and 180 molecules of A3B2 will be formed4) B is limiting reactant and 60 molecules of A3B2 will be formed.

Answer»

In a reaction 3A+ $B_{2}$ $⟶ A_{3} B_{2}$ if 180 atoms of A and 100 molecules of B react then

1) $B_{2}$ is limiting reagent and 100 molecules of $A_{3} B_{2}$ will be formed.

2) A is limiting reagent and 60 molecules of $A_{3} B_{2}$ is formed

3) A is limiting reagent and 180 molecules of $A_{3} B_{2}$ will be formed

4) B is limiting reactant and 60 molecules of $A_{3} B_{2}$ will be formed.

Discussion

14.	What is the main product of the reaction between 2-methyl propene with hydrogen bromide?[RPMT 2002]
Answer» What is the main product of the reaction between 2-methyl propene with hydrogen bromide? [RPMT 2002]

14.

What is the main product of the reaction between 2-methyl propene with hydrogen bromide?[RPMT 2002]

Answer»

What is the main product of the reaction between 2-methyl propene with hydrogen bromide?

[RPMT 2002]

Discussion

15.	Choose the correct order of the basic nature of the below given amines.A. Phenyl methanamineB. N, N-DimethylanilineC. N-Methyl anilineD. Benzenamine
Answer» Choose the correct order of the basic nature of the below given amines. A. Phenyl methanamine B. N, N-Dimethylaniline C. N-Methyl aniline D. Benzenamine

Discussion

16.	Which of the following evolves carbon dioxide on oxidation with periodate?
Answer» Which of the following evolves carbon dioxide on oxidation with periodate?

Discussion

17.	Elements A and B crystallize in cubic structure where atoms A are at the corners of cube and B atoms are at the alternate faces. What is the formula of the compound? Here, what is the meaning of alternate faces?
Answer» Elements A and B crystallize in cubic structure where atoms A are at the corners of cube and B atoms are at the alternate faces. What is the formula of the compound? Here, what is the meaning of alternate faces?

Discussion

18.	what do we mean by erg-s?
Answer» what do we mean by erg-s?

Discussion

19.	Find the oxidation number of Fe_3O_4, Fe_{0.94}O, Fe(CO)_5, H_2S_2O_6, Br_3O_8, HNC, XeO_5
Answer» Find the oxidation number of Fe_3O_4, Fe_{0.94}O, Fe(CO)_5, H_2S_2O_6, Br_3O_8, HNC, XeO_5

Discussion

20.	when we will apply E1 and when E2 for obtaining alkene from alkyl halide
Answer» when we will apply E1 and when E2 for obtaining alkene from alkyl halide

Discussion

21.	Which of the following is non-polar
Answer» Which of the following is non-polar

21.

Which of the following is non-polar

Answer»

Which of the following is non-polar

Discussion

22.	give the order of the elctron afffinity of following:-- O, Se, Te, Po, Cl, F, Br, I
Answer» give the order of the elctron afffinity of following :-- O, Se, Te, Po, Cl, F, Br, I

Discussion

23.	The absolute value of the electron gain enthalpy of halogens satisfies:
Answer» The absolute value of the electron gain enthalpy of halogens satisfies:

Discussion

24.	The initial rate of hydrolysis methyl acetate (1 M) by a weak acid (HA, 1M) is 1/100th of that of a strong acid (HX, 1M), at 25°C. The Ka of HA is?
Answer» The initial rate of hydrolysis methyl acetate (1 M) by a weak acid (HA, 1M) is 1/100th of that of a strong acid (HX, 1M), at 25°C. The Ka of HA is?

Discussion

25.	Interhalogen compounds are covalent due to:
Answer» Interhalogen compounds are covalent due to:

Discussion

26.	Write two uses of ClO2?
Answer» Write two uses of $C l O_{2}$ ?

Discussion

27.	22. A compound AB crystallizes in BCC lattice with unit cell edge length of 480 pm. if radius of B(anion) is 225 pm then the radius of A(cation) is 1. 190.7 pm 2. 225 pm 3. 12.7 pm 4. 240 pm
Answer» 22. A compound AB crystallizes in BCC lattice with unit cell edge length of 480 pm. if radius of B(anion) is 225 pm then the radius of A(cation) is 1. 190.7 pm 2. 225 pm 3. 12.7 pm 4. 240 pm

Discussion

28.	Element Hg has two oxidation states Hg1+ & Hg2+, the correct order of radii of these ions?
Answer» Element $H g$ has two oxidation states $H g^{1 +}$ & $H g^{2 +}$ , the correct order of radii of these ions?

Discussion

29.	Explain fehling's solution and tollen's reagent in detail and explain which type of compounds reduces these two reagents
Answer» Explain fehling's solution and tollen's reagent in detail and explain which type of compounds reduces these two reagents

Discussion

30.	Which of the following describes an inhibitor?
Answer» Which of the following describes an inhibitor?

Discussion

31.	Is there any change in hybridisation of B and N as a result of BF3 + NH3 --> F3B.NH3
Answer» Is there any change in hybridisation of B and N as a result of BF3 + NH3 --> F3B.NH3

Discussion

32.	Difference between the term Constant and Uniform.
Answer» Difference between the term Constant and Uniform.

Discussion

33.	If uncertainty in position and momentum of a particle are numerically equal, then the uncertainty in the speed of the particle should be:
Answer» If uncertainty in position and momentum of a particle are numerically equal, then the uncertainty in the speed of the particle should be:

Discussion

34.	If excess water is added into a bottle labelled as 109% H2SO4 and is reacted with 6.6 g Na2CO3 then find the volume of CO2 evolved at 1 atm and 273 K after the completion of the reaction.
Answer» If excess water is added into a bottle labelled as $109 % H_{2} S O_{4}$ and is reacted with $6.6 g N a_{2} C O_{3}$ then find the volume of $C O_{2}$ evolved at $1 a t m$ and $273 K$ after the completion of the reaction.

Discussion

35.	2.Concentration of a given solution is30% (m/v) what will be the concentration in (m/m) % unit. Density of solution is 1.5g/ml
Answer» 2.Concentration of a given solution is30% (m/v) what will be the concentration in (m/m) % unit. Density of solution is 1.5g/ml

Discussion

36.	20. Why down the group stability and solubility of carbonate of alkaly metals increases?
Answer» 20. Why down the group stability and solubility of carbonate of alkaly metals increases?

Discussion

37.	Instantaneous reaction expresses
Answer» Instantaneous reaction expresses

Discussion

38.	[x+[x]]
Answer» [x+[x]]<=2 solve for x

Discussion

39.	Why LiH is not completely ionic?
Answer» Why LiH is not completely ionic?

Discussion

40.	If a 0.75 g sample contains 3.011×1022 molecules, what will be the molar mass of the molecule?
Answer» If a $0.75 g$ sample contains $3.011 \times 10^{22}$ molecules, what will be the molar mass of the molecule?

Discussion

41.	If n+l=6; m=0,±1 and s=±12 then what is the maximum number of electrons in a cesium atom that will have the above set of quantum numbers?(Atomic number of cesium is 55)
Answer» If $n + l = 6$ ; $m = 0, \pm 1$ and $s = \pm \frac{1}{2}$ then what is the maximum number of electrons in a cesium atom that will have the above set of quantum numbers?(Atomic number of cesium is 55)

Discussion

42.	The incorrect option for cyclic process for an ideal gas is:
Answer» The incorrect option for cyclic process for an ideal gas is:

Discussion

43.	A ball weighing 10 g is moving with a velocity of 90 ms−1. If the uncertainty in its velocity is 5%, then the uncertainty in its position is ×10−33m. (Rounded off to the nearest integer)[Given : h=6.63×10−34Js]
Answer» A ball weighing $10 g$ is moving with a velocity of $90 m s^{- 1} .$ If the uncertainty in its velocity is $5 %$ , then the uncertainty in its position is $\times 10^{- 33} m .$ (Rounded off to the nearest integer) [Given : $h = 6.63 \times 10^{- 34} J s$ ]

Discussion

44.	The concentration of HCN and NaCN in a solution is 0.01 M each. Calculate the concentration of hydroxyl ions if the dissociation constant of HCN is 7.2×10−10.
Answer» The concentration of $H C N$ and $N a C N$ in a solution is $0.01 M$ each. Calculate the concentration of hydroxyl ions if the dissociation constant of $H C N$ is $7.2 \times 10^{- 10}$ .

Discussion

45.	Arrange the following in order of decreasing number of unpaired electrons:(I) [Fe(H2O)6]2+ (II) [Fe(CN)6]3−(III) [Fe(CN)6]4− (IV) [Fe(H2O)6]3+
Answer» Arrange the following in order of decreasing number of unpaired electrons: $(I) [F e (H_{2} O)_{6}]^{2 +} (I I) [F e (C N)_{6}]^{3 -}$ $(I I I) [F e (C N)_{6}]^{4 -} (I V) [F e (H_{2} O)_{6}]^{3 +}$

Discussion

46.	Based on VSEPR theory, the number of 90⁰ F-Br-F angles in BrF5 is ___
Answer» Based on VSEPR theory, the number of 90⁰ F-Br-F angles in $B r F_{5}$ is ___

Discussion

47.	16. How many isomers are there of dimethyl cyclopentane neglecting enantiomer
Answer» 16. How many isomers are there of dimethyl cyclopentane neglecting enantiomer

Discussion

48.	The product of the reaction
Answer» The product of the reaction

48.

The product of the reaction

Answer»

The product of the reaction

Discussion

49.	An aqueous solution containing one mole per litre of each Cu(NO3)2, AgNO3, Hg2(NO3)2 and Mg(NO3)2, is being electrolysed by using inert electrodes. The values of standard electrode potentials in volts (reduction potentials) are Ag/Ag+=+0.80, 2Hg/Hg2+2=+0.79, Cu/Cu2+=+0.34, Mg/Mg2+=−2.37 with increasing voltage, the sequence of deposition of metals on the cathode will be
Answer» An aqueous solution containing one mole per litre of each $C u (N O_{3})_{2}, A g N O_{3}, H g_{2} (N O_{3})_{2}$ and $M g (N O_{3})_{2}$ , is being electrolysed by using inert electrodes. The values of standard electrode potentials in volts (reduction potentials) are $A g / A g^{+} = + 0.80, 2 H g / H g_{2}^{2 +} = + 0.79, C u / C u^{2 +} = + 0.34, M g / M g^{2 +} = - 2.37$ with increasing voltage, the sequence of deposition of metals on the cathode will be

Discussion

50.	Describe with one example how moderately reactive metals are extracted?
Answer» Describe with one example how moderately reactive metals are extracted?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

18. Stability order of carbanion in A. Ethyne carbanion B. Allyl carbanion C. Benzyl carbanion D. Tertiary carbanion

Explain why alcohols and ethers of comparable molecular mass have different boiling points?

A compound with formula AB2O4 adopts a crystal structure in which O2− ions forms ccp arrangement. A2+ ions occupy octahedral voids while B3+ ions are distributed equally between tetrahedral and octahedral voids. The fraction of octahedral and tetrahedral voids occupied respectively are:

Among the following, the surfactant that will form micelles in an aqueous solution at the lowest molar concentration at the ambient condition is:

explain:mole fraction is independent of the temperature because it does not contains volume term.explain the term "volume term "also.

the maximum number of electron in an atom with quantum number n=3 ,l=2 i

Ferrous oxide has a cubic structure and each edge of the unit cell is 5.0 angstrom. Assuming density of the oxide as 4.0 g/cm2, then find he number of Fe2+ and O2-ions present in each unit cell.

think this ten thin that top three thought tank

Differentiate cos(sqrtx) w.r.t x using first principle.

Which one of the following can be made n-type semiconductor only when doped with some group 15 elements like P or As?

Which of the following order of basic strength is correct?(1) NH3 < NH2OH < HN3 < NH2-NH2 (2) NH20H < HN3 < NH2- NH2 < NH3 (3) HN3 < NH3 < NH2OH < NH2-NH2 (4) HN3 < NH2OH < NH2 NH2 < NH3

What is the main product of the reaction between 2-methyl propene with hydrogen bromide?[RPMT 2002]

Choose the correct order of the basic nature of the below given amines.A. Phenyl methanamineB. N, N-DimethylanilineC. N-Methyl anilineD. Benzenamine

Which of the following evolves carbon dioxide on oxidation with periodate?

Elements A and B crystallize in cubic structure where atoms A are at the corners of cube and B atoms are at the alternate faces. What is the formula of the compound? Here, what is the meaning of alternate faces?

what do we mean by erg-s?

Find the oxidation number of Fe_3O_4, Fe_{0.94}O, Fe(CO)_5, H_2S_2O_6, Br_3O_8, HNC, XeO_5

when we will apply E1 and when E2 for obtaining alkene from alkyl halide

Which of the following is non-polar

give the order of the elctron afffinity of following:-- O, Se, Te, Po, Cl, F, Br, I

The absolute value of the electron gain enthalpy of halogens satisfies:

The initial rate of hydrolysis methyl acetate (1 M) by a weak acid (HA, 1M) is 1/100th of that of a strong acid (HX, 1M), at 25°C. The Ka of HA is?

Interhalogen compounds are covalent due to:

Write two uses of ClO2?

22. A compound AB crystallizes in BCC lattice with unit cell edge length of 480 pm. if radius of B(anion) is 225 pm then the radius of A(cation) is 1. 190.7 pm 2. 225 pm 3. 12.7 pm 4. 240 pm

Element Hg has two oxidation states Hg1+ &amp; Hg2+, the correct order of radii of these ions?

Explain fehling's solution and tollen's reagent in detail and explain which type of compounds reduces these two reagents

Which of the following describes an inhibitor?

Is there any change in hybridisation of B and N as a result of BF3 + NH3 --&gt; F3B.NH3

Difference between the term Constant and Uniform.

If uncertainty in position and momentum of a particle are numerically equal, then the uncertainty in the speed of the particle should be:

If excess water is added into a bottle labelled as 109% H2SO4 and is reacted with 6.6 g Na2CO3 then find the volume of CO2 evolved at 1 atm and 273 K after the completion of the reaction.

2.Concentration of a given solution is30% (m/v) what will be the concentration in (m/m) % unit. Density of solution is 1.5g/ml

20. Why down the group stability and solubility of carbonate of alkaly metals increases?

Instantaneous reaction expresses

[x+[x]]

Why LiH is not completely ionic?

If a 0.75 g sample contains 3.011×1022 molecules, what will be the molar mass of the molecule?

If n+l=6; m=0,±1 and s=±12 then what is the maximum number of electrons in a cesium atom that will have the above set of quantum numbers?(Atomic number of cesium is 55)

The incorrect option for cyclic process for an ideal gas is:

A ball weighing 10 g is moving with a velocity of 90 ms−1. If the uncertainty in its velocity is 5%, then the uncertainty in its position is ×10−33m. (Rounded off to the nearest integer)[Given : h=6.63×10−34Js]

The concentration of HCN and NaCN in a solution is 0.01 M each. Calculate the concentration of hydroxyl ions if the dissociation constant of HCN is 7.2×10−10.

Arrange the following in order of decreasing number of unpaired electrons:(I) [Fe(H2O)6]2+ (II) [Fe(CN)6]3−(III) [Fe(CN)6]4− (IV) [Fe(H2O)6]3+

Based on VSEPR theory, the number of 90⁰ F-Br-F angles in BrF5 is ___

16. How many isomers are there of dimethyl cyclopentane neglecting enantiomer

The product of the reaction

Describe with one example how moderately reactive metals are extracted?

Element Hg has two oxidation states Hg1+ & Hg2+, the correct order of radii of these ions?

Is there any change in hybridisation of B and N as a result of BF3 + NH3 --> F3B.NH3