46295 + Interview Questions in Chemistry

1.	The dipole moment of H2O is 1.84D. The bond angle in H2O is 104.50. The bond moment of O - H bond is (cos 52.250 = 0.61)
Answer» The dipole moment of $H_{2} O$ is 1.84D. The bond angle in $H_{2} O$ is ${104.5}^{0}$ . The bond moment of O - H bond is (cos ${52.25}^{0}$ = 0.61)

1.

The dipole moment of H2O is 1.84D. The bond angle in H2O is 104.50. The bond moment of O - H bond is (cos 52.250 = 0.61)

Answer»

The dipole moment of $H_{2} O$ is 1.84D. The bond angle in $H_{2} O$ is ${104.5}^{0}$ . The bond moment of O - H bond is (cos ${52.25}^{0}$ = 0.61)

Discussion

2.	The number of moles of C02 molecules formed when 2 mol of benzene is burnt with sufficient oxygen is1.) 6 2.) 83.) 10 4.) 12
Answer» The number of moles of C02 molecules formed when 2 mol of benzene is burnt with sufficient oxygen is 1.) 6 2.) 8 3.) 10 4.) 12

Discussion

3.	Predict the products formed due to the homolytic cleavage of the C−Br bond in (CH3)3CBr.
Answer» Predict the products formed due to the homolytic cleavage of the $C - B r$ bond in $(C H_{3})_{3} C B r$ .

Discussion

4.	5 moles of oxygen are heated at constant volume from 10 ∘C to 20 ∘C. What will be the change in the internal energy of gas? (The molar heat of oxygen at constant pressure, Cp=7.03 cal mol−1 K−1 and R=8.31 J mol−1K−1)
Answer» 5 moles of oxygen are heated at constant volume from $10^{\circ} C t o 20^{\circ} C .$ What will be the change in the internal energy of gas? (The molar heat of oxygen at constant pressure, $C_{p} = 7.03$ cal mol $^{- 1}$ K $^{- 1}$ and $R = 8.31 J$ mol $^{- 1} K^{- 1}$ )

Discussion

5.	Which of the following gives the correct ratio between time periods of an electron for each revolution in second and third Bohr's orbits ?
Answer» Which of the following gives the correct ratio between time periods of an electron for each revolution in second and third Bohr's orbits ?

Discussion

6.	What will happen to (i)kinetic energy of photoelectrons and (ii) photocurrent of the light is changed from ultraviolet to x-rays in a photoelectric experiment? Intensity of the beam is same in both cases.
Answer» What will happen to (i)kinetic energy of photoelectrons and (ii) photocurrent of the light is changed from ultraviolet to x-rays in a photoelectric experiment? Intensity of the beam is same in both cases.

Discussion

7.	In lithium tetrahydroaluminate (III) the ligand is
Answer» In lithium tetrahydroaluminate (III) the ligand is

Discussion

8.	The options with only amphoteric oxides are
Answer» The options with only amphoteric oxides are

Discussion

9.	If the molecular formula of compound E is CxHyOz. Then, the value of y−x−z is:
Answer» If the molecular formula of compound E is $C_{x} H_{y} O_{z}$ . Then, the value of $y - x - z$ is:

Discussion

10.	Find the products when (CH3)3C-CHO reacts with ch3coch3 in dil. NaOH
Answer» Find the products when (CH3)3C-CHO reacts with ch3coch3 in dil. NaOH

Discussion

11.	73. Molarity of KMnO_4 in acidic medium which can oxidise 20ml of 30 volume H_2O_2 completely is ??
Answer» 73. Molarity of KMnO_4 in acidic medium which can oxidise 20ml of 30 volume H_2O_2 completely is ??

Discussion

12.	X2 -11x/4 + 15/8
Answer» X2 -11x/4 + 15/8

Discussion

13.	During the nuclear explosion, one of the products is 90Sr with half life of 6.93 years. If 1 μg of 90Sr was absorbed in the bones of a newly born baby in place of Ca, how much time, in years, is required to reduce it by 90% if it is not lost metabolically?
Answer» During the nuclear explosion, one of the products is $^{90} Sr$ with half life of 6.93 years. If 1 $μ g$ of $^{90} Sr$ was absorbed in the bones of a newly born baby in place of $C a$ , how much time, in years, is required to reduce it by 90% if it is not lost metabolically?

Discussion

14.	The structure of a mixed oxide is cubic closed packed (ccp). The cubic unit cell of mixed oxide is composed of oxide ions. One fourth of the tetrahedral voids are occupied by divalent mtal A and the octahedral voids are occupied by a monovalent metal B. The formula of the oxide is:
Answer» The structure of a mixed oxide is cubic closed packed (ccp). The cubic unit cell of mixed oxide is composed of oxide ions. One fourth of the tetrahedral voids are occupied by divalent mtal A and the octahedral voids are occupied by a monovalent metal B. The formula of the oxide is:

Discussion

15.	Find the osmotic pressure of 0.1 M solution of urea at 127∘C Molecular formula of urea is (CH4N2O)
Answer» Find the osmotic pressure of $0.1 M$ solution of urea at $127^{\circ} C$ $Molecular formula of urea is (C H_{4} N_{2} O)$

Discussion

16.	What is the definition of chemical reaction.
Answer» What is the definition of chemical reaction.

Discussion

17.	43 How many isomers possible for C8H18 (octane) a)12 b) 18 c)9 d) 15 Is there any trick/formula to directly calculate number of isomers without drawing all structures?
Answer» 43 How many isomers possible for C8H18 (octane) a)12 b) 18 c)9 d) 15 Is there any trick/formula to directly calculate number of isomers without drawing all structures?

Discussion

18.	Sort the given metal halides in increasing order of melting point.
Answer» Sort the given metal halides in increasing order of melting point.

Discussion

19.	Benzene to cyclopentene, what will be the appropriate steps and reagents for this conversionconversion!
Answer» Benzene to cyclopentene, what will be the appropriate steps and reagents for this conversionconversion!

Discussion

20.	9. Structure of 1-methyl ethanol
Answer» 9. Structure of 1-methyl ethanol

Discussion

21.	In a 3.2 Kbp long piece of DNA, 820 adenine bases were found. What would be the number cytosine bases?
Answer» In a 3.2 Kbp long piece of DNA, 820 adenine bases were found. What would be the number cytosine bases?

Discussion

22.	Is BeF5^-3 possible
Answer» Is BeF5^-3 possible

Discussion

23.	How many 3digit no can be formed with 1 2 3 4 5 if repition is not allowded
Answer» How many 3digit no can be formed with 1 2 3 4 5 if repition is not allowded

Discussion

24.	One mole of a liquid (1 bar, 100 ml) is taken in an adiabatic container and the pressure increases steeply to 100 bar. Then at constant pressure of 100 bar, volume decrases by 1 mL. Calculate ΔH.
Answer» One mole of a liquid ( $1 b a r, 100 m l$ ) is taken in an adiabatic container and the pressure increases steeply to $100 b a r$ . Then at constant pressure of $100 b a r$ , volume decrases by $1 m L$ . Calculate $Δ H$ .

Discussion

25.	62. What is the Percentage of nitrogen in HNO3?
Answer» 62. What is the Percentage of nitrogen in HNO3?

Discussion

26.	Bleaching powder and bleach solution are produced on a large scale and used in several household products. The effectiveness of bleach solution is often measured by iodometry.Bleaching powder contains a salt of an oxoacid as one of its components. The anhydride of that oxoacid is
Answer» Bleaching powder and bleach solution are produced on a large scale and used in several household products. The effectiveness of bleach solution is often measured by iodometry. Bleaching powder contains a salt of an oxoacid as one of its components. The anhydride of that oxoacid is

Discussion

27.	What is hybridization ? And what are these spdf orbitals
Answer» What is hybridization ? And what are these spdf orbitals

Discussion

28.	Which is most reactive towards electrophilic reagent?
Answer» Which is most reactive towards electrophilic reagent?

Discussion

29.	53. In the cell reaction 2 Cu(s) 2Ag (aq) Cu (aq) 2Ag(s) + + + +, E 0 cell = 0.46 V. By doubling the concentration of Cu2+, E0 cell is: (a) doubled (b) halved (c) increases but less than double (d) decreases by a small fraction
Answer» 53. In the cell reaction 2 Cu(s) 2Ag (aq) Cu (aq) 2Ag(s) + + + +, E 0 cell = 0.46 V. By doubling the concentration of Cu2+, E0 cell is: (a) doubled (b) halved (c) increases but less than double (d) decreases by a small fraction

Discussion

30.	The concentration of NO_3^- ions when equal volumes of 0.1MAgNO_3 and 0.1MNaCl are mixed together is
Answer» The concentration of NO_3^- ions when equal volumes of 0.1MAgNO_3 and 0.1MNaCl are mixed together is

Discussion

31.	.Suggest a mechanism for the reaction )(-)-2-bromaooctane when treated with aqueous NaOH produces (+)-octan-2-ol
Answer» .Suggest a mechanism for the reaction )(-)-2-bromaooctane when treated with aqueous NaOH produces (+)-octan-2-ol

31.

.Suggest a mechanism for the reaction )(-)-2-bromaooctane when treated with aqueous NaOH produces (+)-octan-2-ol

Answer»

.Suggest a mechanism for the reaction

)(-)-2-bromaooctane when treated with aqueous NaOH produces (+)-octan-2-ol

Discussion

32.	ΔU is equal to
Answer» $Δ U$ is equal to

Discussion

33.	27.The hybridisation of C atoms in CH2=CH-CO-CH3 are
Answer» 27.The hybridisation of C atoms in CH2=CH-CO-CH3 are

Discussion

34.	A glass capillary tube of inner diameter 0.28 mm is lowered vertically into water in a vessel the pressure to be applied on the water in the capillary tube so that water level in the tube is same as that in the vessel is (surface tension of water equals 0.07 Newton per metre and atmospheric pressure = 10 raise to power 5 Newton per metre square)
Answer» A glass capillary tube of inner diameter 0.28 mm is lowered vertically into water in a vessel the pressure to be applied on the water in the capillary tube so that water level in the tube is same as that in the vessel is (surface tension of water equals 0.07 Newton per metre and atmospheric pressure = 10 raise to power 5 Newton per metre square)

Discussion

35.	The number of molecules in 1 kg of nitrogen gas sample (molar mass = 28 g/mol) is approximately:
Answer» The number of molecules in $1 kg$ of nitrogen gas sample (molar mass = 28 g/mol) is approximately:

Discussion

36.	How to compare basicity of d block elements
Answer» How to compare basicity of d block elements

Discussion

37.	Gases H2 He O2 N2 Critical temperature(K) 33.2 5.3 154.3 126 From the above data what whould be the order of liquefaction of these gases? Start writing the order from the gas liquefying first.
Answer» Gases $H_{2} H e O_{2} N_{2}$ $Critical temperature(K) 33.2 5.3 154.3 126$ From the above data what whould be the order of liquefaction of these gases? Start writing the order from the gas liquefying first.

Discussion

38.	One mole each of CaC2, Al4C3 and Mg2C3 react with H2O in separate open flasks at 25oC. Numerical value of the work done by the system is in the order: Given reactions: CaC2(s)+2H2O(l)→Ca(OH)2(s)+C2H2(g) Al4C3(s)+12H2O(l)→4Al(OH)3(s)+3CH4(g) Mg2C3(s)+4H2O(l)→2Mg(OH)2(s)+CH3−C≡CH(g)
Answer» One mole each of $C a C_{2}, A l_{4} C_{3} a n d M g_{2} C_{3}$ react with $H_{2} O$ in separate open flasks at $25^{o} C .$ Numerical value of the work done by the system is in the order: Given reactions: $C a C_{2} (s) + 2 H_{2} O (l) \to C a (O H)_{2} (s) + C_{2} H_{2} (g)$ $A l_{4} C_{3} (s) + 12 H_{2} O (l) \to 4 A l (O H)_{3} (s) + 3 C H_{4} (g)$ $M g_{2} C_{3} (s) + 4 H_{2} O (l) \to 2 M g (O H)_{2} (s) + C H_{3} - C \equiv C H (g)$

Discussion

39.	If the anions (A) form hexagonal closed packing and cations (C) occupy 2/3rd of all octahedral voids in it, then the general formula of the compound is:
Answer» If the anions $(A)$ form hexagonal closed packing and cations $(C)$ occupy $2 / 3^{r d}$ of all octahedral voids in it, then the general formula of the compound is:

Discussion

40.	Why Photoelectric effect cannot be explained by wave theory?
Answer» Why Photoelectric effect cannot be explained by wave theory?

Discussion

41.	Which bond angle of the following molecule has the largest value?
Answer» Which bond angle of the following molecule has the largest value?

Discussion

42.	When 400 mL of 0.2 M H2SO4 solution is mixed with 600 mL of 0.1 M NaOHsolution, the increase in temperature of the final solution is x×10−2KThe value of x (Round off to the Nearest Integer) is [Use :H+(aq)+OH−(aq)→H2O:ΔγH=−57.1 kJ mol−1Specific heat of H2O=4.18J k−1g−1Density of H2O=1.0 g cm−3[ Assume no change in volume of solution on mixing.]
Answer» When $400 m L$ of $0.2 M H_{2} S O_{4}$ solution is mixed with $600 m L$ of $0.1 M N a O H$ solution, the increase in temperature of the final solution is $x \times 10^{- 2} K$ The value of x (Round off to the Nearest Integer) is [Use : $H^{+} (a q) + O H^{-} (a q) \to H_{2} O : Δ_{γ} H = - 57.1 {kJ mol}^{- 1}$ $Specific heat of H_{2} O = 4.18 {J k}^{- 1} g^{- 1}$ $Density of H_{2} O = 1.0 {g cm}^{- 3}$ [ Assume no change in volume of solution on mixing.]

Discussion

43.	4. As we know that the last shell or second last shell have electrons of 32 and 18 respectively but we use only 8 electrons as a max .
Answer» 4. As we know that the last shell or second last shell have electrons of 32 and 18 respectively but we use only 8 electrons as a max .

Discussion

44.	if we add a base to water the number OH- ions will decrease or increase
Answer» if we add a base to water the number OH- ions will decrease or increase

Discussion

45.	Which one of the following is/are true in the formation of emulsion?i) the liquid in larger proportion act as dispersion of mediumii) the liquid with higher surface tension forms the dispersion mediumiii) the liquid in which the emulsifying agent is more soluble forms the dispersion mediumiv) an emulsion is formed by vigorous shaking of two immiscible liquids
Answer» Which one of the following is/are true in the formation of emulsion? i) the liquid in larger proportion act as dispersion of medium ii) the liquid with higher surface tension forms the dispersion medium iii) the liquid in which the emulsifying agent is more soluble forms the dispersion medium iv) an emulsion is formed by vigorous shaking of two immiscible liquids

45.

Which one of the following is/are true in the formation of emulsion?i) the liquid in larger proportion act as dispersion of mediumii) the liquid with higher surface tension forms the dispersion mediumiii) the liquid in which the emulsifying agent is more soluble forms the dispersion mediumiv) an emulsion is formed by vigorous shaking of two immiscible liquids

Answer»

Which one of the following is/are true in the formation of emulsion?

i) the liquid in larger proportion act as dispersion of medium

ii) the liquid with higher surface tension forms the dispersion medium

iii) the liquid in which the emulsifying agent is more soluble forms the dispersion medium

iv) an emulsion is formed by vigorous shaking of two immiscible liquids

Discussion

46.	A carnot engine works between 400k and 600k if it absorbs 3 × 10 ^6 cal heat at highest temperature how much work per cycle can engine perform
Answer» A carnot engine works between 400k and 600k if it absorbs 3 × 10 ^6 cal heat at highest temperature how much work per cycle can engine perform

Discussion

47.	Determine the molar concentration of H+ and OH- ion in a mixture of equal volumes of milar H3PO4 and semimolar Ca(OH)2
Answer» Determine the molar concentration of H+ and OH- ion in a mixture of equal volumes of milar H3PO4 and semimolar Ca(OH)2

Discussion

48.	2. Calculate total number of geometrical isomers in the following compound CH3-CH=CH-CH=CH-CH=CH-C6H5 1) 2 2) 4 3)6 4)8
Answer» 2. Calculate total number of geometrical isomers in the following compound CH3-CH=CH-CH=CH-CH=CH-C6H5 1) 2 2) 4 3)6 4)8

Discussion

49.	Ethylene reacts with S2Cl2 to give
Answer» Ethylene reacts with S2Cl2 to give

Discussion

50.	The reaction of ethyl magnesium bromide with acetaldehyde gives after acidification
Answer» The reaction of ethyl magnesium bromide with acetaldehyde gives after acidification

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The dipole moment of H2O is 1.84D. The bond angle in H2O is 104.50. The bond moment of O - H bond is (cos 52.250 = 0.61)

The number of moles of C02 molecules formed when 2 mol of benzene is burnt with sufficient oxygen is1.) 6 2.) 83.) 10 4.) 12

Predict the products formed due to the homolytic cleavage of the C−Br bond in (CH3)3CBr.

5 moles of oxygen are heated at constant volume from 10 ∘C to 20 ∘C. What will be the change in the internal energy of gas? (The molar heat of oxygen at constant pressure, Cp=7.03 cal mol−1 K−1 and R=8.31 J mol−1K−1)

Which of the following gives the correct ratio between time periods of an electron for each revolution in second and third Bohr's orbits ?

What will happen to (i)kinetic energy of photoelectrons and (ii) photocurrent of the light is changed from ultraviolet to x-rays in a photoelectric experiment? Intensity of the beam is same in both cases.

In lithium tetrahydroaluminate (III) the ligand is

The options with only amphoteric oxides are

If the molecular formula of compound E is CxHyOz. Then, the value of y−x−z is:

Find the products when (CH3)3C-CHO reacts with ch3coch3 in dil. NaOH

73. Molarity of KMnO_4 in acidic medium which can oxidise 20ml of 30 volume H_2O_2 completely is ??

X2 -11x/4 + 15/8

During the nuclear explosion, one of the products is 90Sr with half life of 6.93 years. If 1 μg of 90Sr was absorbed in the bones of a newly born baby in place of Ca, how much time, in years, is required to reduce it by 90% if it is not lost metabolically?

The structure of a mixed oxide is cubic closed packed (ccp). The cubic unit cell of mixed oxide is composed of oxide ions. One fourth of the tetrahedral voids are occupied by divalent mtal A and the octahedral voids are occupied by a monovalent metal B. The formula of the oxide is:

Find the osmotic pressure of 0.1 M solution of urea at 127∘C Molecular formula of urea is (CH4N2O)

What is the definition of chemical reaction.

43 How many isomers possible for C8H18 (octane) a)12 b) 18 c)9 d) 15 Is there any trick/formula to directly calculate number of isomers without drawing all structures?

Sort the given metal halides in increasing order of melting point.

Benzene to cyclopentene, what will be the appropriate steps and reagents for this conversionconversion!

9. Structure of 1-methyl ethanol

In a 3.2 Kbp long piece of DNA, 820 adenine bases were found. What would be the number cytosine bases?

Is BeF5^-3 possible

How many 3digit no can be formed with 1 2 3 4 5 if repition is not allowded

One mole of a liquid (1 bar, 100 ml) is taken in an adiabatic container and the pressure increases steeply to 100 bar. Then at constant pressure of 100 bar, volume decrases by 1 mL. Calculate ΔH.

62. What is the Percentage of nitrogen in HNO3?

Bleaching powder and bleach solution are produced on a large scale and used in several household products. The effectiveness of bleach solution is often measured by iodometry.Bleaching powder contains a salt of an oxoacid as one of its components. The anhydride of that oxoacid is

What is hybridization ? And what are these spdf orbitals

Which is most reactive towards electrophilic reagent?

53. In the cell reaction 2 Cu(s) 2Ag (aq) Cu (aq) 2Ag(s) + + + +, E 0 cell = 0.46 V. By doubling the concentration of Cu2+, E0 cell is: (a) doubled (b) halved (c) increases but less than double (d) decreases by a small fraction

The concentration of NO_3^- ions when equal volumes of 0.1MAgNO_3 and 0.1MNaCl are mixed together is

.Suggest a mechanism for the reaction )(-)-2-bromaooctane when treated with aqueous NaOH produces (+)-octan-2-ol

ΔU is equal to

27.The hybridisation of C atoms in CH2=CH-CO-CH3 are

The number of molecules in 1 kg of nitrogen gas sample (molar mass = 28 g/mol) is approximately:

How to compare basicity of d block elements

Gases H2 He O2 N2 Critical temperature(K) 33.2 5.3 154.3 126 From the above data what whould be the order of liquefaction of these gases? Start writing the order from the gas liquefying first.

One mole each of CaC2, Al4C3 and Mg2C3 react with H2O in separate open flasks at 25oC. Numerical value of the work done by the system is in the order: Given reactions: CaC2(s)+2H2O(l)→Ca(OH)2(s)+C2H2(g) Al4C3(s)+12H2O(l)→4Al(OH)3(s)+3CH4(g) Mg2C3(s)+4H2O(l)→2Mg(OH)2(s)+CH3−C≡CH(g)

If the anions (A) form hexagonal closed packing and cations (C) occupy 2/3rd of all octahedral voids in it, then the general formula of the compound is:

Why Photoelectric effect cannot be explained by wave theory?

Which bond angle of the following molecule has the largest value?

4. As we know that the last shell or second last shell have electrons of 32 and 18 respectively but we use only 8 electrons as a max .

if we add a base to water the number OH- ions will decrease or increase

A carnot engine works between 400k and 600k if it absorbs 3 × 10 ^6 cal heat at highest temperature how much work per cycle can engine perform

Determine the molar concentration of H+ and OH- ion in a mixture of equal volumes of milar H3PO4 and semimolar Ca(OH)2

2. Calculate total number of geometrical isomers in the following compound CH3-CH=CH-CH=CH-CH=CH-C6H5 1) 2 2) 4 3)6 4)8

Ethylene reacts with S2Cl2 to give

The reaction of ethyl magnesium bromide with acetaldehyde gives after acidification