46295 + Interview Questions in Chemistry

1.	The molecular shapes of SF4,CF4andXeF4 are
Answer» The molecular shapes of $S F_{4}, C F_{4} a n d X e F_{4}$ are

Discussion

2.	What is the heat of formation of liquid methyl alcohol in kJ mol−1 , use the following data.Heat of vaporization of liquid methyl alcohol = 38 kJ mol−1 . Heat of formation of gaseous atoms from the elements in their standard states:H=218 kJ mol−1,C=715 kJ mol−1, O=249 kJ mol−1 Average bond energies :C−H=415 kJ mol−1 C−O=356 kJ mol−1 O−H=463 kJ mol−1
Answer» What is the heat of formation of liquid methyl alcohol in $k J m o l^{- 1},$ use the following data. Heat of vaporization of liquid methyl alcohol = $38 k J m o l^{- 1}$ . Heat of formation of gaseous atoms from the elements in their standard states: $H = 218 k J m o l^{- 1}, C = 715 k J m o l^{- 1}, O = 249 k J m o l^{- 1}$ Average bond energies : $C - H = 415 k J m o l^{- 1} C - O = 356 k J m o l^{- 1} O - H = 463 k J m o l^{- 1}$

Discussion

3.	Hydrogen atom is excited from ground state to another state (n). Number of spectral lines in emission spectrum is 10. If this excitation is done by a photon, then energy of the photon is
Answer» Hydrogen atom is excited from ground state to another state $(n)$ . Number of spectral lines in emission spectrum is 10. If this excitation is done by a photon, then energy of the photon is

Discussion

4.	Equivalent volume of CO_2 in the following reaction will be Na_2CO_3 + HCl → NaCl + H_2O + CO_2
Answer» Equivalent volume of CO_2 in the following reaction will be Na_2CO_3 + HCl → NaCl + H_2O + CO_2

Discussion

5.	a partcle under the action of a SHM has a period of 3s and under the effect of another it has a period 4s.what will be its period under the combined action of both the SHM's in the same direction
Answer» a partcle under the action of a SHM has a period of 3s and under the effect of another it has a period 4s.what will be its period under the combined action of both the SHM's in the same direction

Discussion

6.	Among the following complexes (K−P) K3[Fe(CN)6(K),[Co(NH3)6]Cl3(L),Na3[Co(oxalate)3](M),[Ni(H2O)6]Cl2(N), K2[Pt(CN)4](O)and[Zn(H2O)6](NO3)2(P). The diamagnetic complexes are-
Answer» Among the following complexes $(K - P) K_{3} [F e (C N)_{6} (K), [C o (N H_{3})_{6}] C l_{3} (L), N a_{3} [C o (o x a l a t e)_{3}] (M), [N i (H_{2} O)_{6}] C l_{2} (N), K_{2} [P t (C N)_{4}] (O) and [Z n (H_{2} O)_{6}] (N O_{3})_{2} (P)$ . The diamagnetic complexes are-

Discussion

7.	61.1 gram of metal nitrate gave 0.86g of metal sulphate . Then equivalent weight of metal is
Answer» 61.1 gram of metal nitrate gave 0.86g of metal sulphate . Then equivalent weight of metal is

Discussion

8.	calculate the molarities and normalities of the solutions obtained on mixing 100ml of 0.1M h_2SO_4 with 50ml of 0.1M NaO
Answer» calculate the molarities and normalities of the solutions obtained on mixing 100ml of 0.1M h_2SO_4 with 50ml of 0.1M NaO

Discussion

9.	One gram mole of a gas at STP occupies 22.4L volume. This fact is derived from___.
Answer» One gram mole of a gas at STP occupies 22.4L volume. This fact is derived from___.

Discussion

10.	Arrange in the order of increasing acidic strengths.
Answer» Arrange in the order of increasing acidic strengths.

Discussion

11.	A metal nitrate reacts with KI to give a black precipitate which on addition of excess of KI convert into orange solution. The cation of the metal nitrate is
Answer» A metal nitrate reacts with KI to give a black precipitate which on addition of excess of KI convert into orange solution. The cation of the metal nitrate is

Discussion

12.	Althoughgeometries of NH3and H2Omolecules are distorted tetrahedral, bond angle in water is less thanthat of ammonia. Discuss.
Answer» Although geometries of NH₃ and H₂O molecules are distorted tetrahedral, bond angle in water is less than that of ammonia. Discuss.

Discussion

13.	Atoms of element B form hcp lattice and those of the element A occupy 2/3rd of tetrahedral voids. What is the formula of the compound formed by the elements A and B?
Answer» Atoms of element $B$ form hcp lattice and those of the element $A$ occupy $2 / 3^{r d}$ of tetrahedral voids. What is the formula of the compound formed by the elements $A$ and $B$ ?

Discussion

14.	Photoelectrons are liberated by ultraviolet light of wavelength 3000from a metallic surface for which the photoelectric threshold is 4000. The de-broglie wavelength of electron emitted with maximum kinetic energy is
Answer» Photoelectrons are liberated by ultraviolet light of wavelength 3000from a metallic surface for which the photoelectric threshold is 4000. The de-broglie wavelength of electron emitted with maximum kinetic energy is

14.

Photoelectrons are liberated by ultraviolet light of wavelength 3000from a metallic surface for which the photoelectric threshold is 4000. The de-broglie wavelength of electron emitted with maximum kinetic energy is

Answer»

Photoelectrons are liberated by ultraviolet light of wavelength 3000from a metallic surface for which the photoelectric threshold is 4000. The de-broglie wavelength of electron emitted with maximum kinetic energy is

Discussion

15.	QUESTION 2.40 Determine the amount of CaCl2 (i = 2.47) dissolved in 2.5 L of water such that its osmotic pressure is 0.75 atm at 27∘C.
Answer» QUESTION 2.40 Determine the amount of $C a C l_{2}$ (i = 2.47) dissolved in 2.5 L of water such that its osmotic pressure is 0.75 atm at $27^{\circ} C$ .

15.

QUESTION 2.40 Determine the amount of CaCl2 (i = 2.47) dissolved in 2.5 L of water such that its osmotic pressure is 0.75 atm at 27∘C.

Answer»

QUESTION 2.40

Determine the amount of $C a C l_{2}$ (i = 2.47) dissolved in 2.5 L of water such that its osmotic pressure is 0.75 atm at $27^{\circ} C$ .

Discussion

16.	When two isomers are mirror images of each other and rotates the plane of polarized light in opposite directions, it is a type of:
Answer» When two isomers are mirror images of each other and rotates the plane of polarized light in opposite directions, it is a type of:

Discussion

17.	Which color is given by cellulose when treated with iodine solution? Explain.
Answer» Which color is given by cellulose when treated with iodine solution? Explain.

Discussion

18.	Atomic mass is not dimensionless , its unit is amu but vapour density is , though both of them have reference former with carbon 12 and latter with hydrogen , so why we don't have any unit of vapour density?
Answer» Atomic mass is not dimensionless , its unit is amu but vapour density is , though both of them have reference former with carbon 12 and latter with hydrogen , so why we don't have any unit of vapour density?

Discussion

19.	Predict major product in the given reaction.
Answer» Predict major product in the given reaction.

Discussion

20.	Why in the definition of enthalpy of fusion the melting of one mole of solid substance is at STANDARD STATE and in molar enthalpy of vaporization and enthalpy of sublimation it is written that it is at constant temperature and under STANDARD PRESSURE so what is there a difference in definitions
Answer» Why in the definition of enthalpy of fusion the melting of one mole of solid substance is at STANDARD STATE and in molar enthalpy of vaporization and enthalpy of sublimation it is written that it is at constant temperature and under STANDARD PRESSURE so what is there a difference in definitions

Discussion

21.	The temperature coefficient of a certain reaction is found to be 3. if temperature changes from 25^° to 55^° the new rate of reaction will be: a. 8 times b. 9times c. 16times d. 27times
Answer» The temperature coefficient of a certain reaction is found to be 3. if temperature changes from 25^° to 55^° the new rate of reaction will be: a. 8 times b. 9times c. 16times d. 27times

Discussion

22.	54. How many faradays are needed for reduction of 2.5 mole Cr,0? into Cr+3? (1) 15 (3) 6 (2) 12 (4) 3
Answer» 54. How many faradays are needed for reduction of 2.5 mole Cr,0? into Cr+3? (1) 15 (3) 6 (2) 12 (4) 3

Discussion

23.	An electron from various excited states of a hydrogen atom emit radiation to come to the ground state. Let λn,λ9 be the de Broglie wavelength of the electron in the nth state and the ground state respectively. Let Λn be the wavelength of the emitted photon in transition from the nth state to the ground state. For large n,(A,B are constants)
Answer» An electron from various excited states of a hydrogen atom emit radiation to come to the ground state. Let $λ_{n}, λ_{9}$ be the de Broglie wavelength of the electron in the $n^{th}$ state and the ground state respectively. Let $Λ_{n}$ be the wavelength of the emitted photon in transition from the $n^{th}$ state to the ground state. For large $n, (A, B$ are constants)

Discussion

24.	80 Show_ Confirmations of cyclohexane
Answer» 80 Show_ Confirmations of cyclohexane

Discussion

25.	Among α−sulphur, β−sulphur and S2, the number of allotropic forms which will show paramagnetism is
Answer» Among $α - sulphur, β - sulphur$ and $S_{2}$ , the number of allotropic forms which will show paramagnetism is

Discussion

26.	The vapour pressure of a benzene – toluene binary solution at certain temperature is given by P=450–100XT.Where XT is the mole fraction of toluene. Find the vapour pressures of Benzene and Toluene in pure state.
Answer» The vapour pressure of a benzene – toluene binary solution at certain temperature is given by $P = 450 - 100 X_{T}$ . Where $X_{T}$ is the mole fraction of toluene. Find the vapour pressures of Benzene and Toluene in pure state.

Discussion

27.	Students Ram, Shyam, and Raj measured the radius of an element A. The values of their practical were not the same (Ram = 110 nm, Shyam = 190 nm and Raj = 108 nm). Their teacher explained that their measurement was correct by saying that the recorded values are
Answer» Students Ram, Shyam, and Raj measured the radius of an element A. The values of their practical were not the same (Ram = 110 nm, Shyam = 190 nm and Raj = 108 nm). Their teacher explained that their measurement was correct by saying that the recorded values are

Discussion

28.	Why does the pi bond or which involves overlap of p orbital only?why is the sigma bond of p-p orbital much stronger than P-S orbital which is much stronger than S-S orbital?
Answer» Why does the pi bond or which involves overlap of p orbital only? why is the sigma bond of p-p orbital much stronger than P-S orbital which is much stronger than S-S orbital?

Discussion

29.	what would be prcentage composition by volume of mixture of CO and CH4 whose 10.5 ml requires 9ml oxygen for complete combustion ?
Answer» what would be prcentage composition by volume of mixture of CO and CH4 whose 10.5 ml requires 9ml oxygen for complete combustion ?

Discussion

30.	What are the necessary conditions for any system to be aromatic?
Answer» What are the necessary conditions for any system to be aromatic?

Discussion

31.	An allylic carbocation is less stable than
Answer» An allylic carbocation is less stable than

Discussion

32.	Point out the wrong statement :Physical adsorption is characterised by
Answer» Point out the wrong statement : Physical adsorption is characterised by

32.

Point out the wrong statement :Physical adsorption is characterised by

Answer»

Point out the wrong statement :

Physical adsorption is characterised by

Discussion

33.	Two liquids P and Q form an ideal solution at 300K,the vapour pressure of a solution of 1 mole of P and x mole of Q is 550 mm.If the vapour pressure of pure P and pure Q are 400 mm and 600 mm respectively.What is the value of x?
Answer» Two liquids P and Q form an ideal solution at 300K,the vapour pressure of a solution of 1 mole of P and x mole of Q is 550 mm.If the vapour pressure of pure P and pure Q are 400 mm and 600 mm respectively.What is the value of x?

Discussion

34.	The IUPAC name of CH2=CHCH2Br is:
Answer» The IUPAC name of CH₂=CHCH₂Br is:

Discussion

35.	On passing 3A of electricity for 50 min, 1.8 g metal deposits. The equivalent mass of metal is
Answer» On passing 3A of electricity for 50 min, 1.8 g metal deposits. The equivalent mass of metal is

Discussion

36.	What would be conductivity of MX2 if conductivity of X- and M2+is 5 ohm−1cm2 mol−1 and 6 ohm−1cm2 mol−1 respectively?
Answer» What would be conductivity of $M X_{2}$ if conductivity of X- and $M^{2 +} i s 5 o h m^{- 1} c m^{2} m o l^{- 1} a n d 6 o h m^{- 1} c m^{2} m o l^{- 1}$ respectively?

Discussion

37.	Which one of the following reaction is not possible?
Answer» Which one of the following reaction is not possible?

Discussion

38.	Atoms consists of protons, neutrons and electrons. If the mass of neutrons and electrons were made half and two times respectively to their actual masses, then the atomic mass of 6C12
Answer» Atoms consists of protons, neutrons and electrons. If the mass of neutrons and electrons were made half and two times respectively to their actual masses, then the atomic mass of $_{6} C^{12}$

Discussion

39.	Element 'A' burns in nitrogen to give an ionic compound 'B'.Compound 'B' reacts with water to give 'C' and 'D'.A solution of 'C' becomes milky on bubbling CO2 .identify the milky precipitate: 1)M3N2 2)MCO3
Answer» Element 'A' burns in nitrogen to give an ionic compound 'B'.Compound 'B' reacts with water to give 'C' and 'D'.A solution of 'C' becomes milky on bubbling CO2 .identify the milky precipitate: 1)M3N2 2)MCO3

Discussion

40.	The unit of rate constant for the reaction 2H2+2NO→2H2O+N2 which hasRate =K[H2][NO]2, is:
Answer» The unit of rate constant for the reaction $2 H_{2} + 2 NO \to 2 H_{2} O + N_{2}$ which has Rate $= K [H_{2}] [N O]^{2},$ is:

Discussion

41.	Calculate the energy of the photon emitted during the transition from energy levels n = 4 to n = 2 in a hydrogen atom.
Answer» Calculate the energy of the photon emitted during the transition from energy levels n = 4 to n = 2 in a hydrogen atom.

Discussion

42.	Why do the melting points of group 2 elements not show regular trends?
Answer» Why do the melting points of group 2 elements not show regular trends?

Discussion

43.	A colourless aqueous solution contain nitrates of two metal, when it is added to an aqueous solution of NaCl, a white precipitate ws formed. This precipitate was found to be partially soluble in hot water to give a residue P and a solution Q. The residue P was solublein aq. in NH3 and also in excess sodium thiosulfate. The hot solution Q gave a yellow precipitate with KI. The metals X and Y, respectively, are:
Answer» A colourless aqueous solution contain nitrates of two metal, when it is added to an aqueous solution of $N a C l$ , a white precipitate ws formed. This precipitate was found to be partially soluble in hot water to give a residue $P$ and a solution $Q$ . The residue $P$ was solublein aq. in $N H_{3}$ and also in excess sodium thiosulfate. The hot solution $Q$ gave a yellow precipitate with $K I$ . The metals $X$ and $Y$ , respectively, are:

Discussion

44.	A solvent X freezes at 240∘C. If 0.25 molal solution of a non volatile solute in pure X causes freezing point depression of 3∘C, then Kf (in K kg mol−1) for solvent X is:Assume complete association/dissociation of solute.
Answer» A solvent X freezes at $240^{\circ} C$ . If $0.25$ molal solution of a non volatile solute in pure X causes freezing point depression of $3^{\circ} C$ , then $K_{f}$ (in ${K kg mol}^{- 1}$ ) for solvent X is: Assume complete association/dissociation of solute.

Discussion

45.	Which plot best represents the potential energy (E) of two hydrogen atoms as they approach one another to form a hydrogen molecule?
Answer» Which plot best represents the potential energy (E) of two hydrogen atoms as they approach one another to form a hydrogen molecule?

Discussion

46.	During the hydrogenation of oils, the substance which is commonly used as a catalyst
Answer» During the hydrogenation of oils, the substance which is commonly used as a catalyst

Discussion

47.	Chemical formulae for potassium arsenate should be K_3AsO_4 Where Potassium is K^+ and arsenate is AsO_4^{3-} . But the correct formula of potassium arsenate is written to be KH_2AsO_4 .What is the reason for adding hydrogen in this exception ? Why is it applicable for higher order metals like sodium and potassium ?
Answer» Chemical formulae for potassium arsenate should be K_3AsO_4 Where Potassium is K^+ and arsenate is AsO_4^{3-} . But the correct formula of potassium arsenate is written to be KH_2AsO_4 .What is the reason for adding hydrogen in this exception ? Why is it applicable for higher order metals like sodium and potassium ?

Discussion

48.	CH3CH2CONH2A→CH3CH2NH2B→CH3CH2OHWhat is "A" and "B" in the following reaction?
Answer» $C H_{3} C H_{2} C O N H_{2} A \to C H_{3} C H_{2} N H_{2} B \to C H_{3} C H_{2} O H$ What is "A" and "B" in the following reaction?

Discussion

49.	How many equal Xe-O bond lengths are present in HXeO63- ?
Answer» How many equal Xe-O bond lengths are present in HXeO₆^3- ?

Discussion

50.	74. 1)Na+ and Me both are isoelectric with 2s2 2p6 outer electronic configuration.Their IEvalues are related as 1)Δ HNa+=Δ HNe 2)Δ HNa+▶Δ HNe 3)Δ HNa+◀Δ HNe 4)none of the above 2)The no.of elements present in period is given by? A)the no.of orbitals filled B)Half of the no.of orbitals filled C)Twice the no.of orbitals filled D)Equals to the no.of sub shell in the principle quantum no.of the period 3)The lustrous nature of metal is attributed to their A)Density is high B)crystalline nature C) High polished surface D)Ability to reflect light by mobile electrons
Answer» 74. 1)Na+ and Me both are isoelectric with 2s2 2p6 outer electronic configuration.Their IEvalues are related as 1)Δ HNa+=Δ HNe 2)Δ HNa+▶Δ HNe 3)Δ HNa+◀Δ HNe 4)none of the above 2)The no.of elements present in period is given by? A)the no.of orbitals filled B)Half of the no.of orbitals filled C)Twice the no.of orbitals filled D)Equals to the no.of sub shell in the principle quantum no.of the period 3)The lustrous nature of metal is attributed to their A)Density is high B)crystalline nature C) High polished surface D)Ability to reflect light by mobile electrons

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The molecular shapes of SF4,CF4andXeF4 are

Hydrogen atom is excited from ground state to another state (n). Number of spectral lines in emission spectrum is 10. If this excitation is done by a photon, then energy of the photon is

Equivalent volume of CO_2 in the following reaction will be Na_2CO_3 + HCl → NaCl + H_2O + CO_2

a partcle under the action of a SHM has a period of 3s and under the effect of another it has a period 4s.what will be its period under the combined action of both the SHM's in the same direction

Among the following complexes (K−P) K3[Fe(CN)6(K),[Co(NH3)6]Cl3(L),Na3[Co(oxalate)3](M),[Ni(H2O)6]Cl2(N), K2[Pt(CN)4](O)and[Zn(H2O)6](NO3)2(P). The diamagnetic complexes are-

61.1 gram of metal nitrate gave 0.86g of metal sulphate . Then equivalent weight of metal is

calculate the molarities and normalities of the solutions obtained on mixing 100ml of 0.1M h_2SO_4 with 50ml of 0.1M NaO

One gram mole of a gas at STP occupies 22.4L volume. This fact is derived from___.

Arrange in the order of increasing acidic strengths.

A metal nitrate reacts with KI to give a black precipitate which on addition of excess of KI convert into orange solution. The cation of the metal nitrate is

Althoughgeometries of NH3and H2Omolecules are distorted tetrahedral, bond angle in water is less thanthat of ammonia. Discuss.

Atoms of element B form hcp lattice and those of the element A occupy 2/3rd of tetrahedral voids. What is the formula of the compound formed by the elements A and B?

Photoelectrons are liberated by ultraviolet light of wavelength 3000from a metallic surface for which the photoelectric threshold is 4000. The de-broglie wavelength of electron emitted with maximum kinetic energy is

QUESTION 2.40 Determine the amount of CaCl2 (i = 2.47) dissolved in 2.5 L of water such that its osmotic pressure is 0.75 atm at 27∘C.

When two isomers are mirror images of each other and rotates the plane of polarized light in opposite directions, it is a type of:

Which color is given by cellulose when treated with iodine solution? Explain.

Atomic mass is not dimensionless , its unit is amu but vapour density is , though both of them have reference former with carbon 12 and latter with hydrogen , so why we don't have any unit of vapour density?

Predict major product in the given reaction.

Why in the definition of enthalpy of fusion the melting of one mole of solid substance is at STANDARD STATE and in molar enthalpy of vaporization and enthalpy of sublimation it is written that it is at constant temperature and under STANDARD PRESSURE so what is there a difference in definitions

The temperature coefficient of a certain reaction is found to be 3. if temperature changes from 25^° to 55^° the new rate of reaction will be: a. 8 times b. 9times c. 16times d. 27times

54. How many faradays are needed for reduction of 2.5 mole Cr,0? into Cr+3? (1) 15 (3) 6 (2) 12 (4) 3

80 Show_ Confirmations of cyclohexane

Among α−sulphur, β−sulphur and S2, the number of allotropic forms which will show paramagnetism is

The vapour pressure of a benzene – toluene binary solution at certain temperature is given by P=450–100XT.Where XT is the mole fraction of toluene. Find the vapour pressures of Benzene and Toluene in pure state.

Students Ram, Shyam, and Raj measured the radius of an element A. The values of their practical were not the same (Ram = 110 nm, Shyam = 190 nm and Raj = 108 nm). Their teacher explained that their measurement was correct by saying that the recorded values are

Why does the pi bond or which involves overlap of p orbital only?why is the sigma bond of p-p orbital much stronger than P-S orbital which is much stronger than S-S orbital?

what would be prcentage composition by volume of mixture of CO and CH4 whose 10.5 ml requires 9ml oxygen for complete combustion ?

What are the necessary conditions for any system to be aromatic?

An allylic carbocation is less stable than

Point out the wrong statement :Physical adsorption is characterised by

Two liquids P and Q form an ideal solution at 300K,the vapour pressure of a solution of 1 mole of P and x mole of Q is 550 mm.If the vapour pressure of pure P and pure Q are 400 mm and 600 mm respectively.What is the value of x?

The IUPAC name of CH2=CHCH2Br is:

On passing 3A of electricity for 50 min, 1.8 g metal deposits. The equivalent mass of metal is

What would be conductivity of MX2 if conductivity of X- and ​M2+is 5 ohm−1cm2 mol−1 and 6 ohm−1cm2 mol−1 respectively?

Which one of the following reaction is not possible?

Atoms consists of protons, neutrons and electrons. If the mass of neutrons and electrons were made half and two times respectively to their actual masses, then the atomic mass of 6C12

Element 'A' burns in nitrogen to give an ionic compound 'B'.Compound 'B' reacts with water to give 'C' and 'D'.A solution of 'C' becomes milky on bubbling CO2 .identify the milky precipitate: 1)M3N2 2)MCO3

The unit of rate constant for the reaction 2H2+2NO→2H2O+N2 which hasRate =K[H2][NO]2, is:

Calculate the energy of the photon emitted during the transition from energy levels n = 4 to n = 2 in a hydrogen atom.

Why do the melting points of group 2 elements not show regular trends?

A solvent X freezes at 240∘C. If 0.25 molal solution of a non volatile solute in pure X causes freezing point depression of 3∘C, then Kf (in K kg mol−1) for solvent X is:Assume complete association/dissociation of solute.

Which plot best represents the potential energy (E) of two hydrogen atoms as they approach one another to form a hydrogen molecule?

During the hydrogenation of oils, the substance which is commonly used as a catalyst

CH3CH2CONH2A→CH3CH2NH2B→CH3CH2OHWhat is "A" and "B" in the following reaction?

How many equal Xe-O bond lengths are present in HXeO​​​6​​3- ?

What would be conductivity of MX2 if conductivity of X- and M2+is 5 ohm−1cm2 mol−1 and 6 ohm−1cm2 mol−1 respectively?

How many equal Xe-O bond lengths are present in HXeO63- ?