46295 + Interview Questions in Chemistry

1.	In which of the following crystals alternate tetrahedral voids are occupied?[IIT 2005]
Answer» In which of the following crystals alternate tetrahedral voids are occupied? [IIT 2005]

1.

In which of the following crystals alternate tetrahedral voids are occupied?[IIT 2005]

Answer»

In which of the following crystals alternate tetrahedral voids are occupied?

[IIT 2005]

2.	Why inside throughout the shell potential is constant?
Answer» Why inside throughout the shell potential is constant?

Discussion

3.	40 For a first order bragg's diffraction observed in an ionic crystal at an incident angle 60 degree, the inter atomic distance between the two layers is( wavelength of X-Ray used is 10 nm)
Answer» 40 For a first order bragg's diffraction observed in an ionic crystal at an incident angle 60 degree, the inter atomic distance between the two layers is( wavelength of X-Ray used is 10 nm)

Discussion

4.	At a certain temperature and a total pressure of 105 Pa, iodine vapours contain 40 % by volume of iodine atoms[I2(g) ⇋ 2 I(g)]. Kp for the equilibrium will be
Answer» At a certain temperature and a total pressure of $10_{5}$ Pa, iodine vapours contain $40 %$ by volume of iodine atoms $[I_{2} (g) ⇋ 2 I (g)] . K_{p}$ for the equilibrium will be

Discussion

5.	51. Mixture of vilatile components has total pressure in torr as P=254-Xa where Xa is the mole fraction of A. What are Pa and Pb in their pure states?
Answer» 51. Mixture of vilatile components has total pressure in torr as P=254-Xa where Xa is the mole fraction of A. What are Pa and Pb in their pure states?

Discussion

6.	61. 4g H2, 32g O2, 14g N2 and 11g CO2 are taken in a bulb of 500ml. Which one of these has maximum active mass ? (1)H2 (2)O2 (3)N2 (4)CO2
Answer» 61. 4g H2, 32g O2, 14g N2 and 11g CO2 are taken in a bulb of 500ml. Which one of these has maximum active mass ? (1)H2 (2)O2 (3)N2 (4)CO2

Discussion

7.	The solution which has lowest freezing point isOptions:Should have chosen 1 M CaF20.01 M CaSO4Wrong 0.005 M KI0.1 M Al2 (SO4)3
Answer» The solution which has lowest freezing point is Options: Should have chosen 1 M CaF2 0.01 M CaSO4 Wrong 0.005 M KI 0.1 M Al2 (SO4)3

Discussion

8.	Balance this chemical equation:S8+HNO3------>H2SO4+H2O+NO2with steps.
Answer» Balance this chemical equation: S8+HNO3------>H2SO4+H2O+NO2 with steps.

Discussion

9.	How does aldol condensation of cyclohexanone and propanal occur ?
Answer» How does aldol condensation of cyclohexanone and propanal occur ?

Discussion

10.	83.in 90 grams of 20% of aqueous salt solution 10 grams more water is added calculate the final concentration of the solution
Answer» 83.in 90 grams of 20% of aqueous salt solution 10 grams more water is added calculate the final concentration of the solution

Discussion

11.	3 Titanium element forms a lattice having density 4.54 g/cc. If edge length is 412.6 pm . Which type of close packing and lattice will it form
Answer» 3 Titanium element forms a lattice having density 4.54 g/cc. If edge length is 412.6 pm . Which type of close packing and lattice will it form

Discussion

12.	An organic compoundcontains 69.77% carbon, 11.63% hydrogen and rest oxygen. Themolecular mass of the compound is 86. It does not reduce Tollens’reagent but forms an addition compound with sodium hydrogensulphiteand give positive iodoform test. On vigorous oxidation it givesethanoic and propanoic acid. Write the possible structure of thecompound.
Answer» An organic compound contains 69.77% carbon, 11.63% hydrogen and rest oxygen. The molecular mass of the compound is 86. It does not reduce Tollens’ reagent but forms an addition compound with sodium hydrogensulphite and give positive iodoform test. On vigorous oxidation it gives ethanoic and propanoic acid. Write the possible structure of the compound.

Discussion

13.	28. C5H12O is a monohydric alcohol.Determine the no. Of isomers that can be obtained from the compound.Also mention the chiral and the enantiomers amongst them.
Answer» 28. C5H12O is a monohydric alcohol.Determine the no. Of isomers that can be obtained from the compound.Also mention the chiral and the enantiomers amongst them.

Discussion

14.	Benzaldehyde reacts with acetic acid anhydride in presence of sodium acetate at 180°c then the product formed is
Answer» Benzaldehyde reacts with acetic acid anhydride in presence of sodium acetate at 180°c then the product formed is

Discussion

15.	Why is Ka1=Ka2 for sulphuric acid in water
Answer» Why is Ka1=Ka2 for sulphuric acid in water

Discussion

16.	Arrange the following alkyl halides in increasing order of the rate of β-elimination reaction with alcoholic KOH.
Answer» Arrange the following alkyl halides in increasing order of the rate of $β$ -elimination reaction with alcoholic $K O H$ .

Discussion

17.	What is meaning of coherent nature of SI unit
Answer» What is meaning of coherent nature of SI unit

Discussion

18.	For a certain reaction of order ‘n’, the half-life ⎛⎜⎝t12⎞⎟⎠ is given by, t12=2−√2k×C120, where k is a constant and C0 is the initial concentration. Find 'n'.
Answer» For a certain reaction of order ‘n’, the half-life $⎛ ⎜ ⎝ t_{\frac{1}{2}} ⎞ ⎟ ⎠$ is given by, $t_{\frac{1}{2}} = \frac{2 - \sqrt{2}}{k} \times C_{0}^{\frac{1}{2}}$ , where k is a constant and $C_{0}$ is the initial concentration. Find 'n'.

Discussion

19.	10. What is diborane adducts?
Answer» 10. What is diborane adducts?

Discussion

20.	The hexaquomanganese(II) ion contains five unpaired electrons, while thehexacyanoion contains only one unpaired electron. Explain usingCrystal Field Theory.
Answer» The hexaquo manganese(II) ion contains five unpaired electrons, while the hexacyanoion contains only one unpaired electron. Explain using Crystal Field Theory.

Discussion

21.	Which of the following does not occupy a volume of 4.48L at STP ?A 0.2 mol of H2B 12.8 g of SO2C 3.2 g of O2D 800 mg of He
Answer» Which of the following does not occupy a volume of 4.48L at STP ? A 0.2 mol of H2 B 12.8 g of SO2 C 3.2 g of O2 D 800 mg of He

Discussion

22.	Astream of water flowing horizontally with a speed of 15 ms–1gushes out of a tube of cross-sectional area 10–2m2,and hits a vertical wall nearby. What is the force exerted on thewall by the impact of water, assuming it does not rebound?
Answer» A stream of water flowing horizontally with a speed of 15 m s^–1 gushes out of a tube of cross-sectional area 10^–2 m², and hits a vertical wall nearby. What is the force exerted on the wall by the impact of water, assuming it does not rebound?

Discussion

23.	what is the shape of cro2cl2?
Answer» what is the shape of cro2cl2?

Discussion

24.	The ionic radii (in Å) of N3–, O2–and F–are respectively:
Answer» The ionic radii (in Å) of N3–, O2–and F–are respectively:

Discussion

25.	The SI unit of temperature is________.
Answer» The SI unit of temperature is________.

Discussion

26.	17 draw all resonance structures for PO4 with all arrows depicting the movement of electrons.
Answer» 17 draw all resonance structures for PO4 with all arrows depicting the movement of electrons.

Discussion

27.	Identifythe monomer in the following polymeric structures.(i)(ii)
Answer» Identify the monomer in the following polymeric structures. (i) (ii)

27.

Identifythe monomer in the following polymeric structures.(i)(ii)

Answer»

Identify
the monomer in the following polymeric structures.

(i)

(ii)

Discussion

28.	In Arrhenius equation for a certain reaction, the value of A (Arrhenius factor) and Ea (activation energy) are 4×1013 s−1 and 98.6 kJ mol−1 respectively. At what temperature, the reaction will have specific rate constant of 1.1×10−3s−1?Take log(1.14)=−0.56
Answer» In Arrhenius equation for a certain reaction, the value of A (Arrhenius factor) and $E_{a}$ (activation energy) are $4 \times 10^{13} s^{- 1} and 98.6 k J m o l^{- 1}$ respectively. At what temperature, the reaction will have specific rate constant of $1.1 \times 10^{- 3} s^{- 1}$ ? Take $l o g (\frac{1.1}{4}) = - 0.56$

Discussion

29.	What is stability range of neutron proton ration for nucleus? Does it vary for alpha and beta decay?
Answer» What is stability range of neutron proton ration for nucleus? Does it vary for alpha and beta decay?

Discussion

30.	Sodium carbonate reacts with ethanoic acid to form sodium ethanoate, carbon dioxide and water. In an experiment, 5.3 g of sodium carbonate reacted with 6 g of ethanoic acid to form 8.2 g of sodium ethanoate, 2.2 g of carbon dioxide and 0.9 g of water. Show that this data verifies the law of conservation of mass.
Answer» Sodium carbonate reacts with ethanoic acid to form sodium ethanoate, carbon dioxide and water. In an experiment, 5.3 g of sodium carbonate reacted with 6 g of ethanoic acid to form 8.2 g of sodium ethanoate, 2.2 g of carbon dioxide and 0.9 g of water. Show that this data verifies the law of conservation of mass.

Discussion

31.	The ratio of number of molecules in equal weights of H2, He and CH4 is
Answer» The ratio of number of molecules in equal weights of $H_{2}$ , He and $C H_{4}$ is

Discussion

32.	Which of these Will not react with acetylene 1.NaOH, 2. ammonical AgNO3 , 3.Na 4.HCL
Answer» Which of these Will not react with acetylene 1.NaOH, 2. ammonical AgNO3 , 3.Na 4.HCL

Discussion

33.	How many of the element show catenation property1.Ge2.Sn3.Si4.Pb
Answer» How many of the element show catenation property 1.Ge 2.Sn 3.Si 4.Pb

Discussion

34.	Question 20. In an attempt to demonstrate electrical conductivity through an electrolyte, the following apparatus ( see the figure ) was set up. Which among the following statement(s) is/ are correct? (i) Bulb will not glow because electrolyte is not acidic. (ii) Bulb will glow because NaOH is a strong base and furnishes ions for conduction. (iii) Bulb will not glow because circuit is incomplete. (iv) Bulb will not glow because it depends upon the type of electrolytic solution. (a) (i) and (iii) (b) (ii) and (iv) (c) (ii) only (d) (iv) only
Answer» Question 20. In an attempt to demonstrate electrical conductivity through an electrolyte, the following apparatus ( see the figure ) was set up. Which among the following statement(s) is/ are correct? (i) Bulb will not glow because electrolyte is not acidic. (ii) Bulb will glow because NaOH is a strong base and furnishes ions for conduction. (iii) Bulb will not glow because circuit is incomplete. (iv) Bulb will not glow because it depends upon the type of electrolytic solution. (a) (i) and (iii) (b) (ii) and (iv) (c) (ii) only (d) (iv) only

Discussion

35.	The correct sequence of bond enthalpy of ′C—X′ bond is :
Answer» The correct sequence of bond enthalpy of $^{'} C — X^{'}$ bond is :

Discussion

36.	A metal X on heating in nitrogen gas gives Y. Y on treatment with H2O gives a colourless gas Z. Z when passed through chloroplatinic acid produces a yellow precipitate. ‘Z′ is
Answer» A metal $X$ on heating in nitrogen gas gives $Y$ . $Y$ on treatment with $H_{2} O$ gives a colourless gas $Z$ . $Z$ when passed through chloroplatinic acid produces a yellow precipitate. $‘ Z^{'}$ is

Discussion

37.	9. An ester A on hydrolysis produces one acid B and an alcohol C . B can reduce feling solution .C on oxidation produces B .Identify A,B,C.
Answer» 9. An ester A on hydrolysis produces one acid B and an alcohol C . B can reduce feling solution .C on oxidation produces B .Identify A,B,C.

Discussion

38.	30.An aqueous solution of an acid is so weak that it can be assumed to be practically unionized when boiled at 100.4 degree Celsius. 25 ml of the solution was neutralized by 38.5 ml of 1 N solution of NaOH. What is the basicity of acid if Kb for water is 0.52 K Kg/mol?
Answer» 30.An aqueous solution of an acid is so weak that it can be assumed to be practically unionized when boiled at 100.4 degree Celsius. 25 ml of the solution was neutralized by 38.5 ml of 1 N solution of NaOH. What is the basicity of acid if Kb for water is 0.52 K Kg/mol?

Discussion

39.	acidic oxide among the following is(a)NO(b)CO(c)Na2o(d)Cl2O7
Answer» acidic oxide among the following is (a)NO (b)CO (c)Na2o (d)Cl2O7

Discussion

40.	Comment separately whether FeO,Fe2O3 and Fe3O4 are basic or acidic in nature.Also, arrange them in their relative order of basicity.
Answer» Comment separately whether FeO,Fe2O3 and Fe3O4 are basic or acidic in nature. Also, arrange them in their relative order of basicity.

Discussion

41.

Classify these changes into physical and chemical changes. [5 MARKS] S.No Change 1 Melting of Ice 2 Dissolving sugar in water 3 Burning rubber 4 Burning camphor 5 Melting Wax

Answer»

Classify these changes into physical and chemical changes. [5 MARKS]

S.No	Change
1	Melting of Ice
2	Dissolving sugar in water
3	Burning rubber
4	Burning camphor
5	Melting Wax

Discussion

42.	Kp= 0.04 atm at 899 K for the equilibrium shown below. What is theequilibrium concentration of C2H6when it is placed in a flask at 4.0 atm pressure and allowed to cometo equilibrium?
Answer» K_p = 0.04 atm at 899 K for the equilibrium shown below. What is the equilibrium concentration of C₂H₆ when it is placed in a flask at 4.0 atm pressure and allowed to come to equilibrium?

42.

Kp= 0.04 atm at 899 K for the equilibrium shown below. What is theequilibrium concentration of C2H6when it is placed in a flask at 4.0 atm pressure and allowed to cometo equilibrium?

Answer»

K_p
= 0.04 atm at 899 K for the equilibrium shown below. What is the
equilibrium concentration of C₂H₆
when it is placed in a flask at 4.0 atm pressure and allowed to come
to equilibrium?

Discussion

43.	When electromagnetic radiation of wavelength 300 nm falls on the surface of sodium, electrons are emitted with a kinetic energy of 1.68×105J mol−1. What is the maximum wavelength that will cause a photoelectron to be emitted?
Answer» When electromagnetic radiation of wavelength $300 n m$ falls on the surface of sodium, electrons are emitted with a kinetic energy of $1.68 \times 10^{5} J m o l^{- 1}$ . What is the maximum wavelength that will cause a photoelectron to be emitted?

Discussion

44.	The freezing point of benzene decreases by 0.45degreeC when 0.2 g of acetic acid is added to 20g of benzene. if acetic acid associates to form dimer in benzene.%age association of acetic acid in benzene will be? (Kf for benzene =5.12K kg mol)
Answer» The freezing point of benzene decreases by 0.45degreeC when 0.2 g of acetic acid is added to 20g of benzene. if acetic acid associates to form dimer in benzene.%age association of acetic acid in benzene will be? (Kf for benzene =5.12K kg mol)

Discussion

45.	How many types of voids are generated if the spheres of second layer are placed in the depressions of a 2D hcp?
Answer» How many types of voids are generated if the spheres of second layer are placed in the depressions of a 2D hcp?

Discussion

46.	How to calculate oxidation number of Co in [Co(N02)2(C5H5N)2(NH3)2]N03 ?
Answer» How to calculate oxidation number of Co in [Co(N02)2(C5H5N)2(NH3)2]N03 ?

Discussion

47.	A gas undergoes a cyclic process a−b−c−a which is as shown in PV diagram. The process a−b is isothermal, b−c is adiabatic and c−a is a straight line on P−V diagram. Work done in process ab and bc is 5J and 4J respectively. If the area enclosed by the diagram abca in the figure is 3J, choose the correct statements.
Answer» A gas undergoes a cyclic process $a - b - c - a$ which is as shown in $P V$ diagram. The process $a - b$ is isothermal, $b - c$ is adiabatic and $c - a$ is a straight line on $P - V$ diagram. Work done in process $a b$ and $b c$ is $5 J$ and $4 J$ respectively. If the area enclosed by the diagram $a b c a$ in the figure is $3 J$ , choose the correct statements.

Discussion

48.	Mechanism of partial hydrolysis , hydrolysis and Reduction by LiAlH_4 of Acetaldehyde Cyanohydrin
Answer» Mechanism of partial hydrolysis , hydrolysis and Reduction by LiAlH_4 of Acetaldehyde Cyanohydrin

Discussion

49.	on what basis we decide whether the compound(acyclic or cyclic) is resonance stabilised?
Answer» on what basis we decide whether the compound(acyclic or cyclic) is resonance stabilised?

Discussion

50.	In the alkane H3C–CH2–C(CH3)2–CH2–CH(CH3)2, identify 1°, 2°, 3° carbon atoms and give the number of H atoms bonded to each one of these.
Answer» In the alkane H₃C–CH₂–C(CH₃)₂–CH₂–CH(CH₃)₂, identify 1°, 2°, 3° carbon atoms and give the number of H atoms bonded to each one of these.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

In which of the following crystals alternate tetrahedral voids are occupied?[IIT 2005]

Why inside throughout the shell potential is constant?

40 For a first order bragg's diffraction observed in an ionic crystal at an incident angle 60 degree, the inter atomic distance between the two layers is( wavelength of X-Ray used is 10 nm)

At a certain temperature and a total pressure of 105 Pa, iodine vapours contain 40 % by volume of iodine atoms[I2(g) ⇋ 2 I(g)]. Kp for the equilibrium will be

51. Mixture of vilatile components has total pressure in torr as P=254-Xa where Xa is the mole fraction of A. What are Pa and Pb in their pure states?

61. 4g H2, 32g O2, 14g N2 and 11g CO2 are taken in a bulb of 500ml. Which one of these has maximum active mass ? (1)H2 (2)O2 (3)N2 (4)CO2

The solution which has lowest freezing point isOptions:Should have chosen 1 M CaF20.01 M CaSO4Wrong 0.005 M KI0.1 M Al2 (SO4)3

Balance this chemical equation:S8+HNO3------>H2SO4+H2O+NO2with steps.

How does aldol condensation of cyclohexanone and propanal occur ?

83.in 90 grams of 20% of aqueous salt solution 10 grams more water is added calculate the final concentration of the solution

3 Titanium element forms a lattice having density 4.54 g/cc. If edge length is 412.6 pm . Which type of close packing and lattice will it form

28. C5H12O is a monohydric alcohol.Determine the no. Of isomers that can be obtained from the compound.Also mention the chiral and the enantiomers amongst them.

Benzaldehyde reacts with acetic acid anhydride in presence of sodium acetate at 180°c then the product formed is

Why is Ka1=Ka2 for sulphuric acid in water

Arrange the following alkyl halides in increasing order of the rate of β-elimination reaction with alcoholic KOH.

What is meaning of coherent nature of SI unit

For a certain reaction of order ‘n’, the half-life ⎛⎜⎝t12⎞⎟⎠ is given by, t12=2−√2k×C120, where k is a constant and C0 is the initial concentration. Find 'n'.

10. What is diborane adducts?

The hexaquomanganese(II) ion contains five unpaired electrons, while thehexacyanoion contains only one unpaired electron. Explain usingCrystal Field Theory.

Which of the following does not occupy a volume of 4.48L at STP ?A 0.2 mol of H2B 12.8 g of SO2C 3.2 g of O2D 800 mg of He

Astream of water flowing horizontally with a speed of 15 ms–1gushes out of a tube of cross-sectional area 10–2m2,and hits a vertical wall nearby. What is the force exerted on thewall by the impact of water, assuming it does not rebound?

what is the shape of cro2cl2?

The ionic radii (in Å) of N3–, O2–and F–are respectively:

The SI unit of temperature is________.

17 draw all resonance structures for PO4 with all arrows depicting the movement of electrons.

Identifythe monomer in the following polymeric structures.(i)(ii)

In Arrhenius equation for a certain reaction, the value of A (Arrhenius factor) and Ea (activation energy) are 4×1013 s−1 and 98.6 kJ mol−1 respectively. At what temperature, the reaction will have specific rate constant of 1.1×10−3s−1?Take log(1.14)=−0.56

What is stability range of neutron proton ration for nucleus? Does it vary for alpha and beta decay?

The ratio of number of molecules in equal weights of H2, He and CH4 is

Which of these Will not react with acetylene 1.NaOH, 2. ammonical AgNO3 , 3.Na 4.HCL

How many of the element show catenation property1.Ge2.Sn3.Si4.Pb

The correct sequence of bond enthalpy of ′C—X′ bond is :

A metal X on heating in nitrogen gas gives Y. Y on treatment with H2O gives a colourless gas Z. Z when passed through chloroplatinic acid produces a yellow precipitate. ‘Z′ is

9. An ester A on hydrolysis produces one acid B and an alcohol C . B can reduce feling solution .C on oxidation produces B .Identify A,B,C.

30.An aqueous solution of an acid is so weak that it can be assumed to be practically unionized when boiled at 100.4 degree Celsius. 25 ml of the solution was neutralized by 38.5 ml of 1 N solution of NaOH. What is the basicity of acid if Kb for water is 0.52 K Kg/mol?

acidic oxide among the following is(a)NO(b)CO(c)Na2o(d)Cl2O7

Comment separately whether FeO,Fe2O3 and Fe3O4 are basic or acidic in nature.Also, arrange them in their relative order of basicity.

Classify these changes into physical and chemical changes. [5 MARKS] S.No Change 1 Melting of Ice 2 Dissolving sugar in water 3 Burning rubber 4 Burning camphor 5 Melting Wax

Kp= 0.04 atm at 899 K for the equilibrium shown below. What is theequilibrium concentration of C2H6when it is placed in a flask at 4.0 atm pressure and allowed to cometo equilibrium?

When electromagnetic radiation of wavelength 300 nm falls on the surface of sodium, electrons are emitted with a kinetic energy of 1.68×105J mol−1. What is the maximum wavelength that will cause a photoelectron to be emitted?

The freezing point of benzene decreases by 0.45degreeC when 0.2 g of acetic acid is added to 20g of benzene. if acetic acid associates to form dimer in benzene.%age association of acetic acid in benzene will be? (Kf for benzene =5.12K kg mol)

How many types of voids are generated if the spheres of second layer are placed in the depressions of a 2D hcp?

How to calculate oxidation number of Co in [Co(N02)2(C5H5N)2(NH3)2]N03 ?

Mechanism of partial hydrolysis , hydrolysis and Reduction by LiAlH_4 of Acetaldehyde Cyanohydrin

on what basis we decide whether the compound(acyclic or cyclic) is resonance stabilised?

In the alkane H3C–CH2–C(CH3)2–CH2–CH(CH3)2, identify 1°, 2°, 3° carbon atoms and give the number of H atoms bonded to each one of these.