46295 + Interview Questions in Chemistry

1.	Which of the following represents soap
Answer» Which of the following represents soap

Discussion

2.	The solubility of a saturated solution of calcium fluoride is 2×10−4 mol L−1. Its solubility product (in mol3 L−3) is:
Answer» The solubility of a saturated solution of calcium fluoride is $2 \times 10^{- 4} {mol L}^{- 1}$ . Its solubility product $({in mol}^{3} L^{- 3})$ is:

Discussion

3.	A molecule of the type MX3 has zero dipole moment. The hybridization of M is -
Answer» A molecule of the type $M X_{3}$ has zero dipole moment. The hybridization of M is -

Discussion

4.	The product of release at anode in the electrolysis of 50% concentrated H2SO4
Answer» The product of release at anode in the electrolysis of 50% concentrated H2SO4

Discussion

5.	Explain the allotropes of boron.
Answer» Explain the allotropes of boron.

Discussion

6.	The correct order of decreasing second ionization energy of Li, Be, Ne,(1) Ne>B>Li>C>BeC, B(2) Li>Ne C>B>Be(3) Ne>C>B>Be>Li4)
Answer» The correct order of decreasing second ionization energy of Li, Be, Ne,(1) Ne>B>Li>C>BeC, B(2) Li>Ne C>B>Be(3) Ne>C>B>Be>Li4)

Discussion

7.	1.355 g of a substance dissolved in 55 g of CH3COOH produced a depression in the freezing point of 0.618∘C. Calculate the molar mass of the substance. (Kf=3.85∘C kg mol−1)
Answer» $1.355 g$ of a substance dissolved in $55 g$ of $C H_{3} C O O H$ produced a depression in the freezing point of ${0.618}^{\circ} C$ . Calculate the molar mass of the substance. $(K_{f} = {3.85}^{\circ} C k g m o l^{- 1})$

Discussion

8.	when chlorine reacts with ethyl alcohol it forms (1)chloroform (2)chloral (3)CCl (4)
Answer» when chlorine reacts with ethyl alcohol it forms (1)chloroform (2)chloral (3)CCl (4)

Discussion

9.	Sodium metal crystallises in a body-centred cubic lattice with the cell edge a = 4.29 Å . What is the radius of the sodium atom?
Answer» Sodium metal crystallises in a body-centred cubic lattice with the cell edge a = 4.29 Å . What is the radius of the sodium atom?

Discussion

10.	50 Potassium crystallizes in BCC unit cell with distance between nearest neighbours of 4.52 ,if it's atomic mass=39amu A what would be edge lenght of unit cell? B what would be the density of K metal ? C how many nearest neighbouring atoms does each potassium atom has?
Answer» 50 Potassium crystallizes in BCC unit cell with distance between nearest neighbours of 4.52 ,if it's atomic mass=39amu A what would be edge lenght of unit cell? B what would be the density of K metal ? C how many nearest neighbouring atoms does each potassium atom has?

Discussion

11.	In the reaction, As2S3+xNO−3+yH+⟶2AsSO4+zNO2+aS+2H2O Find the coeffieicnts x , y, z and a (Respectively)
Answer» In the reaction, $A s_{2} S_{3} + x N O_{3}^{-} + y H^{+} ⟶ 2 A s S O_{4} + z N O_{2} + a S + 2 H_{2} O$ Find the coeffieicnts x , y, z and a (Respectively)

Discussion

12.	A radioactive element having decay constant to be 2.31×10−3 per day is reduced to 25% of its initial amount in a period of ?
Answer» A radioactive element having decay constant to be $2.31 \times 10^{- 3}$ per day is reduced to 25% of its initial amount in a period of ?

Discussion

13.	Given:From the following compound(s), which on reaction with HNO3 will give the product having degree of rotation, [α]D=−52.7∘ is/are:
Answer» Given:From the following compound(s), which on reaction with $H N O_{3}$ will give the product having degree of rotation, $[α]_{D} = - {52.7}^{\circ}$ is/are:

Discussion

14.	What will be the oxidation state of Sulphur in H2SO5?
Answer» What will be the oxidation state of Sulphur in $H_{2} S O_{5}$ ?

Discussion

15.	The number of unpaired electrons in the p-subshell of oxygen atom is
Answer» The number of unpaired electrons in the p-subshell of oxygen atom is

15.

The number of unpaired electrons in the p-subshell of oxygen atom is

Answer»

The number of unpaired electrons in the p-subshell of oxygen atom is

Discussion

16.	Why limewater turns milky when CO2 is passed through it.
Answer» Why limewater turns milky when ${CO}_{2}$ is passed through it.

Discussion

17.	In rocksalt structure by which method we know which lattice is formed
Answer» In rocksalt structure by which method we know which lattice is formed

Discussion

18.	process of dehydration of benzylic and allyllic alcohol??
Answer» process of dehydration of benzylic and allyllic alcohol??

Discussion

19.	2o3 give rise to -3o2 ; step 1; o3-o2 plus o (fast); step 2; o3 plus o- 2o2 (slow) find the order of the reaction
Answer» 2o3 give rise to -3o2 ; step 1; o3-o2 plus o (fast); step 2; o3 plus o- 2o2 (slow) find the order of the reaction

Discussion

20.	1) A sample of element X contents 100 atoms with a mass of 12. 00 u an 10 atoms with mass of 14. 00 u calculate the average atomic mass of element x.
Answer» 1) A sample of element X contents 100 atoms with a mass of 12. 00 u an 10 atoms with mass of 14. 00 u calculate the average atomic mass of element x.

Discussion

21.	174 14g of CO at 27 C is mixed with 16g of O2 at 47 C . The temprature of mixture is (vibration mide neglected).
Answer» 174 14g of CO at 27 C is mixed with 16g of O2 at 47 C . The temprature of mixture is (vibration mide neglected).

Discussion

22.	The name of the following compound is
Answer» The name of the following compound is

22.

The name of the following compound is

Answer»

The name of the following compound is

Discussion

23.	Symbols 7935Br and 79Br can be written, whereas symbols 3579Br and 35Br are not acceptable. Answer briefly.
Answer» Symbols $_{35}^{79} Br$ and $^{79} Br$ can be written, whereas symbols $_{79}^{35} Br$ and $^{35} Br$ are not acceptable. Answer briefly.

Discussion

24.	Why molten ionic compound conduct electric current? Explain with help of any electrolyte.
Answer» Why molten ionic compound conduct electric current? Explain with help of any electrolyte.

Discussion

25.	Explain why- Lewis acid cannot be said to be a Brownsted- Lowry acid but a base can be said?
Answer» Explain why- Lewis acid cannot be said to be a Brownsted- Lowry acid but a base can be said?

Discussion

26.	List-1List-2P.PhNO2Zn/NH4Cl−−−−−−−→1.Ph−N=N−PhQ.PhNO2Zn/Alc.NaOH−−−−−−−−−→2.Ph−NH2R.PhNO2LAH−−−→3.PhNHOHS.PhNO2Na3AsO3/NaOH−−−−−−−−−−−→4.O↑Ph−N=N−Ph
Answer» $\begin{matrix} List-1 & List-2 P . & P h N O_{2} Z n / N H_{4} C l - ------ \to & 1. & P h - N = N - P h Q . & P h N O_{2} Z n / A l c . N a O H - -------- \to & 2. & P h - N H_{2} R . & P h N O_{2} L A H - -- \to & 3. & P h N H O H S . & P h N O_{2} N a_{3} A s O_{3} / N a O H - ---------- \to & 4. & O ↑ P h - N = N - P h \end{matrix}$

Discussion

27.	y=x+(1/x+1), then find dy/dx.
Answer» y=x+(1/x+1), then find dy/dx.

Discussion

28.	dicholorobenzene (X) REACTS WITH CHLORINE IN THE PRESENCE OF IRON GIVES TRICHLOROBENZENE (Y) ONLY ONE STRUCTURAL ISOMER OF Y IS FORMED HENCE X IS o isomers p isomer m isomer none of the above
Answer» dicholorobenzene (X) REACTS WITH CHLORINE IN THE PRESENCE OF IRON GIVES TRICHLOROBENZENE (Y) ONLY ONE STRUCTURAL ISOMER OF Y IS FORMED HENCE X IS o isomers p isomer m isomer none of the above

Discussion

29.	If a > 0 , f(x) = f(x + a) + f(x - a) , then
Answer» If a > 0 , f(x) = f(x + a) + f(x - a) , then

Discussion

30.	A flask containing 10g of a Gas of relative molecular mass 100 at a pressure of 100kPa was evacuated to a pressure of 0.01 kPa at constant temperature. Which one of the following is the best estimate of the number of molecules left in the flask?
Answer» A flask containing 10g of a Gas of relative molecular mass 100 at a pressure of 100kPa was evacuated to a pressure of 0.01 kPa at constant temperature. Which one of the following is the best estimate of the number of molecules left in the flask?

Discussion

31.	Orthoboric acid
Answer» Orthoboric acid

Discussion

32.	In column 1 different setup for Young’s double slit experiment is given. Distance between two slits S1 and S2 is ‘d’ and between slits and screen is ‘D’ in every setup. In column 2 location of central maxima is given. In column 3 path difference ΔP is given at point P which is θ angle above MO line (d << D) Which of the following is correct, when a glass slab of thickness t and refractive index μ is placed in front of S1.
Answer» In column 1 different setup for Young’s double slit experiment is given. Distance between two slits $S_{1}$ and $S_{2}$ is ‘d’ and between slits and screen is ‘D’ in every setup. In column 2 location of central maxima is given. In column 3 path difference $Δ P$ is given at point P which is $θ$ angle above MO line (d << D) Which of the following is correct, when a glass slab of thickness t and refractive index $μ$ is placed in front of $S_{1}$ .

32.

In column 1 different setup for Young’s double slit experiment is given. Distance between two slits S1 and S2 is ‘d’ and between slits and screen is ‘D’ in every setup. In column 2 location of central maxima is given. In column 3 path difference ΔP is given at point P which is θ angle above MO line (d << D) Which of the following is correct, when a glass slab of thickness t and refractive index μ is placed in front of S1.

Answer»

In column 1 different setup for Young’s double slit experiment is given. Distance between two slits $S_{1}$ and $S_{2}$ is ‘d’ and between slits and screen is ‘D’ in every setup. In column 2 location of central maxima is given. In column 3 path difference $Δ P$ is given at point P which is $θ$ angle above MO line (d << D)

Which of the following is correct, when a glass slab of thickness t and refractive index $μ$ is placed in front of $S_{1}$ .

Discussion

33.	Draw the electron dot structure for F2.
Answer» Draw the electron dot structure for $F_{2}$ .

Discussion

34.	Which statement is incorrect??Why??1)Higher the gold number of lyophilic sol better is its protective action2)Lower the gold number of a lyophilic sol better is its protective action3)The Bredig's arc method is usually suitable for preparing sols of inert metals4)The osmotic pressure method gives the average molar mass of a polymer
Answer» Which statement is incorrect??Why?? 1)Higher the gold number of lyophilic sol better is its protective action 2)Lower the gold number of a lyophilic sol better is its protective action 3)The Bredig's arc method is usually suitable for preparing sols of inert metals 4)The osmotic pressure method gives the average molar mass of a polymer

Discussion

35.	Refer the given reactions and answer the following questions; identify X, Y and Z respectively:
Answer» Refer the given reactions and answer the following questions; identify X, Y and Z respectively:

Discussion

36.	In a copper (Cu++) electrolysis †an k ,what mass of copper is deposited by a current of 10KA in 10 minutes ? Mass of Cu++ ion= 1.1 x10^{-25}kg .
Answer» In a copper (Cu++) electrolysis †an k ,what mass of copper is deposited by a current of 10KA in 10 minutes ? Mass of Cu++ ion= 1.1 x10^{-25}kg .

Discussion

37.	The formation of precipitate almost instantly (immediately) when alcoholic AgNO3 reacts with -
Answer» The formation of precipitate almost instantly (immediately) when alcoholic $A g N O_{3}$ reacts with -

Discussion

38.	Calculate the percentage degree of dissociation of an electrolyte XY2 (Normal molar mass = 164) in water if the observed molar mass by measuring elevation in boiling point is 65.6
Answer» Calculate the percentage degree of dissociation of an electrolyte $X Y_{2}$ (Normal molar mass = $164$ ) in water if the observed molar mass by measuring elevation in boiling point is $65.6$

Discussion

39.	is HCL covalent or ionic
Answer» is HCL covalent or ionic

Discussion

40.	50.in semicarbazone why hydrogen is from semicarbazone and not from amide group
Answer» 50.in semicarbazone why hydrogen is from semicarbazone and not from amide group

Discussion

41.	Choose incorrect option:-1. Transition elements exhibit higher enthalpies of atomization.2. Zinc is a transition element3. Melting and boiling points increases steadily from Sc to Cu.
Answer» Choose incorrect option:- 1. Transition elements exhibit higher enthalpies of atomization. 2. Zinc is a transition element 3. Melting and boiling points increases steadily from Sc to Cu.

Discussion

42.	A reversible chemical reaction having two reactants in equilibrium. If the concentrations of the reactants are doubled, then the equilibrium constant will
Answer» A reversible chemical reaction having two reactants in equilibrium. If the concentrations of the reactants are doubled, then the equilibrium constant will

42.

A reversible chemical reaction having two reactants in equilibrium. If the concentrations of the reactants are doubled, then the equilibrium constant will

Answer»

A reversible chemical reaction having two reactants in equilibrium. If the

concentrations of the reactants are doubled, then the equilibrium constant

will

Discussion

43.	Aniline behaves as a weak base. When 0.1M, 50mL solution of aniline was mixed with 0.1M, 25mL solution of HCl the pH of resulting solution was 8. The pH of 0.01 M solution of anilinium chloride will be:
Answer» Aniline behaves as a weak base. When $0.1 M, 50 m L$ solution of aniline was mixed with $0.1 M, 25 m L$ solution of $H C l$ the $p H$ of resulting solution was 8. The $p H$ of $0.01 M$ solution of anilinium chloride will be:

Discussion

44.	Using crystal field theory, draw energy level diagram, write electronic configuration of the central metal atom/ion and determine the magnetic moment value in the following (a) [CoF6]3−,[Co(H2O)6]2+,[Co(CN)6]3− (b) FeF3−6,[Fe(H2O)6]2+,[Fe(CN)6]4−
Answer» Using crystal field theory, draw energy level diagram, write electronic configuration of the central metal atom/ion and determine the magnetic moment value in the following (a) $[C o F_{6}]^{3 -}, [C o (H_{2} O)_{6}]^{2 +}, [C o (C N)_{6}]^{3 -}$ (b) $F e F_{6}^{3 -}, [F e (H_{2} O)_{6}]^{2 +}, [F e (C N)_{6}]^{4 -}$

Discussion

45.	2.Effective atomic number of Nico4
Answer» 2.Effective atomic number of Nico4

Discussion

46.	What is the product B of the following reaction?Hex-3-ynal (i)NaBH4−−−−−−→(ii)PBr3A(i)Mg/Ether−−−−−−−−−→(ii)CO2/H3O+B
Answer» What is the product B of the following reaction? Hex-3-ynal $(i) N a B H_{4} - ----- \to (i i) P B r_{3} A (i) M g / E t h e r - -------- \to (i i) C O_{2} / H_{3} O^{+} B$

Discussion

47.	200 ml 0.1M K2SO4 is added with 300ml 0.2MKCl .determine molarconcentration of k+ in the solution.
Answer» 200 ml 0.1M K2SO4 is added with 300ml 0.2MKCl .determine molarconcentration of k+ in the solution.

Discussion

48.	46. Why ferromagnetic substance doesn't lose magnetism in absence of an magnetic field like paramagnetic substances
Answer» 46. Why ferromagnetic substance doesn't lose magnetism in absence of an magnetic field like paramagnetic substances

Discussion

49.	Primary , secondary and tertiary amines are1) chain isomers2)position isomers3) functional isomers4) Tautomers
Answer» Primary , secondary and tertiary amines are 1) chain isomers 2)position isomers 3) functional isomers 4) Tautomers

Discussion

50.	An element has the electronic configuration 1s2,2s2 2p6,3s2 3p2. Its valency electrons are
Answer» An element has the electronic configuration $1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{2}$ . Its valency electrons are

50.

An element has the electronic configuration 1s2,2s2 2p6,3s2 3p2. Its valency electrons are

Answer»

An element has the electronic configuration $1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{2}$ . Its valency electrons are

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Which of the following represents soap

The solubility of a saturated solution of calcium fluoride is 2×10−4 mol L−1. Its solubility product (in mol3 L−3) is:

A molecule of the type MX3 has zero dipole moment. The hybridization of M is -

The product of release at anode in the electrolysis of 50% concentrated H2SO4

Explain the allotropes of boron.

The correct order of decreasing second ionization energy of Li, Be, Ne,(1) Ne>B>Li>C>BeC, B(2) Li>Ne C>B>Be(3) Ne>C>B>Be>Li4)

1.355 g of a substance dissolved in 55 g of CH3COOH produced a depression in the freezing point of 0.618∘C. Calculate the molar mass of the substance. (Kf=3.85∘C kg mol−1)

when chlorine reacts with ethyl alcohol it forms (1)chloroform (2)chloral (3)CCl (4)

Sodium metal crystallises in a body-centred cubic lattice with the cell edge a = 4.29 Å . What is the radius of the sodium atom?

50 Potassium crystallizes in BCC unit cell with distance between nearest neighbours of 4.52 ,if it's atomic mass=39amu A what would be edge lenght of unit cell? B what would be the density of K metal ? C how many nearest neighbouring atoms does each potassium atom has?

In the reaction, As2S3+xNO−3+yH+⟶2AsSO4+zNO2+aS+2H2O Find the coeffieicnts x , y, z and a (Respectively)

A radioactive element having decay constant to be 2.31×10−3 per day is reduced to 25% of its initial amount in a period of ?

Given:From the following compound(s), which on reaction with HNO3 will give the product having degree of rotation, [α]D=−52.7∘ is/are:

What will be the oxidation state of Sulphur in H2SO5?

The number of unpaired electrons in the p-subshell of oxygen atom is

Why limewater turns milky when CO2 is passed through it.

In rocksalt structure by which method we know which lattice is formed

process of dehydration of benzylic and allyllic alcohol??

2o3 give rise to -3o2 ; step 1; o3-o2 plus o (fast); step 2; o3 plus o- 2o2 (slow) find the order of the reaction

1) A sample of element X contents 100 atoms with a mass of 12. 00 u an 10 atoms with mass of 14. 00 u calculate the average atomic mass of element x.

174 14g of CO at 27 C is mixed with 16g of O2 at 47 C . The temprature of mixture is (vibration mide neglected).

The name of the following compound is

Symbols 7935Br and 79Br can be written, whereas symbols 3579Br and 35Br are not acceptable. Answer briefly.

Why molten ionic compound conduct electric current? Explain with help of any electrolyte.

Explain why- Lewis acid cannot be said to be a Brownsted- Lowry acid but a base can be said?

List-1List-2P.PhNO2Zn/NH4Cl−−−−−−−→1.Ph−N=N−PhQ.PhNO2Zn/Alc.NaOH−−−−−−−−−→2.Ph−NH2R.PhNO2LAH−−−→3.PhNHOHS.PhNO2Na3AsO3/NaOH−−−−−−−−−−−→4.O↑Ph−N=N−Ph

y=x+(1/x+1), then find dy/dx.

dicholorobenzene (X) REACTS WITH CHLORINE IN THE PRESENCE OF IRON GIVES TRICHLOROBENZENE (Y) ONLY ONE STRUCTURAL ISOMER OF Y IS FORMED HENCE X IS o isomers p isomer m isomer none of the above

If a > 0 , f(x) = f(x + a) + f(x - a) , then

A flask containing 10g of a Gas of relative molecular mass 100 at a pressure of 100kPa was evacuated to a pressure of 0.01 kPa at constant temperature. Which one of the following is the best estimate of the number of molecules left in the flask?

Orthoboric acid

Draw the electron dot structure for F2.

Refer the given reactions and answer the following questions; identify X, Y and Z respectively:

In a copper (Cu++) electrolysis †an k ,what mass of copper is deposited by a current of 10KA in 10 minutes ? Mass of Cu++ ion= 1.1 x10^{-25}kg .

The formation of precipitate almost instantly (immediately) when alcoholic AgNO3 reacts with -

Calculate the percentage degree of dissociation of an electrolyte XY2 (Normal molar mass = 164) in water if the observed molar mass by measuring elevation in boiling point is 65.6

is HCL covalent or ionic

50.in semicarbazone why hydrogen is from semicarbazone and not from amide group

Choose incorrect option:-1. Transition elements exhibit higher enthalpies of atomization.2. Zinc is a transition element3. Melting and boiling points increases steadily from Sc to Cu.

A reversible chemical reaction having two reactants in equilibrium. If the concentrations of the reactants are doubled, then the equilibrium constant will

Aniline behaves as a weak base. When 0.1M, 50mL solution of aniline was mixed with 0.1M, 25mL solution of HCl the pH of resulting solution was 8. The pH of 0.01 M solution of anilinium chloride will be:

Using crystal field theory, draw energy level diagram, write electronic configuration of the central metal atom/ion and determine the magnetic moment value in the following (a) [CoF6]3−,[Co(H2O)6]2+,[Co(CN)6]3− (b) FeF3−6,[Fe(H2O)6]2+,[Fe(CN)6]4−

2.Effective atomic number of Nico4

What is the product B of the following reaction?Hex-3-ynal (i)NaBH4−−−−−−→(ii)PBr3A(i)Mg/Ether−−−−−−−−−→(ii)CO2/H3O+B

200 ml 0.1M K2SO4 is added with 300ml 0.2MKCl .determine molarconcentration of k+ in the solution.

46. Why ferromagnetic substance doesn't lose magnetism in absence of an magnetic field like paramagnetic substances

Primary , secondary and tertiary amines are1) chain isomers2)position isomers3) functional isomers4) Tautomers

An element has the electronic configuration 1s2,2s2 2p6,3s2 3p2. Its valency electrons are