46295 + Interview Questions in Chemistry

1.	Which of the following statements is not true? (a) Paramagnetic substances are weakly attracted by magnetic field (b) Ferromagnetic substances cannot be magnetised permanently (c) The domains in antiferromagnetic substances are oppositely oriented with respect to each other (d) Pairing of electrons cancels their magnetic moment in the diamagnetic substances
Answer» Which of the following statements is not true? (a) Paramagnetic substances are weakly attracted by magnetic field (b) Ferromagnetic substances cannot be magnetised permanently (c) The domains in antiferromagnetic substances are oppositely oriented with respect to each other (d) Pairing of electrons cancels their magnetic moment in the diamagnetic substances

1.

Which of the following statements is not true? (a) Paramagnetic substances are weakly attracted by magnetic field (b) Ferromagnetic substances cannot be magnetised permanently (c) The domains in antiferromagnetic substances are oppositely oriented with respect to each other (d) Pairing of electrons cancels their magnetic moment in the diamagnetic substances

Answer»

Which of the following statements is not true?

(a) Paramagnetic substances are weakly attracted by magnetic field

(b) Ferromagnetic substances cannot be magnetised permanently

(c) The domains in antiferromagnetic substances are oppositely oriented with respect to each other

(d) Pairing of electrons cancels their magnetic moment in the diamagnetic substances

Discussion

2.	A dilute solution Contains “x” moles of solute “A” in 1 kg of solvent with molal elevation constant kb. The solute dimerises in the solution according to the following equation. The degree of association is (α) 2A⇌A2 The degree of association is equal to
Answer» A dilute solution Contains “x” moles of solute “A” in 1 kg of solvent with molal elevation constant kb. The solute dimerises in the solution according to the following equation. The degree of association is $(α)$ $2 A ⇌ A_{2}$ The degree of association is equal to

2.

A dilute solution Contains “x” moles of solute “A” in 1 kg of solvent with molal elevation constant kb. The solute dimerises in the solution according to the following equation. The degree of association is (α) 2A⇌A2 The degree of association is equal to

Answer»

A dilute solution Contains “x” moles of solute “A” in 1 kg of solvent with molal elevation constant kb. The solute dimerises in the solution according to the following equation. The degree of association is $(α)$
$2 A ⇌ A_{2}$

The degree of association is equal to

Discussion

3.	Why does NO2 dimerise ?
Answer» Why does $N O_{2}$ dimerise ?

Discussion

4.	The best reagent to convert pent-3-en-2-ol into pent-3-en-2-one is:
Answer» The best reagent to convert pent-3-en-2-ol into pent-3-en-2-one is:

Discussion

5.	The energy required to remove an electron from the surface of Na metal is 2.3 eV. What is the largest wavelength of radiation which can show the photoelectric effect:
Answer» The energy required to remove an electron from the surface of $N a$ metal is 2.3 eV. What is the largest wavelength of radiation which can show the photoelectric effect:

Discussion

6.	The threshold wavelength for photoelectric emission from a material is 5200˙A. Photoelectrons will be emitted when this material is illuminated with monochromatic radiation from a
Answer» The threshold wavelength for photoelectric emission from a material is 5200 $˙ A$ . Photoelectrons will be emitted when this material is illuminated with monochromatic radiation from a

Discussion

7.	B2O3 + C + Cl2→A + B. A & B are?
Answer» B $_{2}$ O $_{3}$ + C + Cl $_{2}$ $\to A + B . A & B$ are?

Discussion

8.	An object having uniform linear mass density is in equilibrium as shown in the diagram. The value of lr is ___
Answer» An object having uniform linear mass density is in equilibrium as shown in the diagram. The value of $\frac{l}{r}$ is ___

8.

An object having uniform linear mass density is in equilibrium as shown in the diagram. The value of lr is ___

Answer»

An object having uniform linear mass density is in equilibrium as shown in the diagram. The value of $\frac{l}{r}$ is

___

Discussion

9.	Write Einstein’s photoelectric effect equation and explain symbols used.
Answer» Write Einstein’s photoelectric effect equation and explain symbols used.

Discussion

10.	A first order reaction is 50% completed in 1.26×1014s . How much time would it take for 100% completion?
Answer» A first order reaction is 50% completed in $1.26 \times 10^{14} s$ . How much time would it take for 100% completion?

Discussion

11.	In the standardization of Na2S2O3 using K2Cr2O7 by iodometry , the equivalent weight of K2Cr2O7 is : (Given : Molecular weight of K2Cr2O7 is 294 g)
Answer» In the standardization of $N a_{2} S_{2} O_{3}$ using $K_{2} C r_{2} O_{7}$ by iodometry , the equivalent weight of $K_{2} C r_{2} O_{7}$ is : (Given : Molecular weight of $K_{2} C r_{2} O_{7} i s 294 g$ )

Discussion

12.	The first ionisation energy is maximum for:
Answer» The first ionisation energy is maximum for:

Discussion

13.	A polyatomic gas (γ=43) is compressed to 18 of its volume adiabatically and reversibly. If its initial pressure is P0 its new pressure will be
Answer» A polyatomic gas $(γ = \frac{4}{3})$ is compressed to $\frac{1}{8}$ of its volume adiabatically and reversibly. If its initial pressure is $P_{0}$ its new pressure will be

Discussion

14.	Which is the weakest base
Answer» Which is the weakest base

Discussion

15.	E° cell for the given redox reaction is 2.71 V Mg(s)+Cu2+(0.01M)→Mg2+(0.001M)+Cu(s) Calculate Ecell for the reaction. Write the direction of flow of current when an external opposite potential applied is (i) less than 2.71 V and (ii) greater than 2.71 V
Answer» E° cell for the given redox reaction is 2.71 V $M g_{(s)} + C u_{(0.01 M)}^{2 +} \to M g_{(0.001 M)}^{2 +} + C u_{(s)}$ Calculate $E_{c e l l}$ for the reaction. Write the direction of flow of current when an external opposite potential applied is (i) less than 2.71 V and (ii) greater than 2.71 V

Discussion

16.	Pressure of 1 g of an ideal gas A at 27∘C is found to be 2 bar. When 2 g of another ideal gas B is introduced in the same flask at the same temperature, the pressure becomes 3 bar. Find a relationship between their molecular masses.
Answer» Pressure of $1 g$ of an ideal gas $A$ at $27^{\circ} C$ is found to be 2 bar. When $2 g$ of another ideal gas $B$ is introduced in the same flask at the same temperature, the pressure becomes 3 bar. Find a relationship between their molecular masses.

Discussion

17.	In hydrogen a atom, an electric is revolving in the orbit of radius 0.53 ̇ with 6.6x1015 radiations/s. Magnetic field produced at the centre of the orbit is A) 0.125 Wb/m2 B) 1.25 Wb/m2 C) 12.5 Wb/m2 D) 125 Wb/m2
Answer» In hydrogen a atom, an electric is revolving in the orbit of radius 0.53 ̇ with 6.6x1015 radiations/s. Magnetic field produced at the centre of the orbit is A) 0.125 Wb/m² B) 1.25 Wb/m² C) 12.5 Wb/m² D) 125 Wb/m²

Discussion

18.	Find the work done in J when one mole of an ideal gas in 10 litre container at 1 atm is allowed to enter into an evacuated bulb of capacity 100 litre
Answer» Find the work done in J when one mole of an ideal gas in 10 litre container at 1 atm is allowed to enter into an evacuated bulb of capacity 100 litre

Discussion

19.	Match the complexes in Column-I with their properties listed in Column-II Column IColumn II(a)[Co(NH3)4(H2O)2]Cl2(p)Geometrical isomers(b)[Pt(NH3)2Cl2](q)Paramagnetic(c)[Co(H2O)5Cl]Cl(r)Diamagnetic(d)[Ni(H2O)6]Cl2(s)Metal ion with + 2 oxidation state
Answer» Match the complexes in Column-I with their properties listed in Column-II $\begin{matrix} Column I & Column II (a) & [C o (N H_{3})_{4} (H_{2} O)_{2}] C l_{2} & (p) & Geometrical isomers (b) & [P t (N H_{3})_{2} C l_{2}] & (q) & Paramagnetic (c) & [C o (H_{2} O)_{5} C l] C l & (r) & Diamagnetic (d) & [N i (H_{2} O)_{6}] C l_{2} & (s) & Metal ion with + 2 oxidation state \end{matrix}$

19.

Match the complexes in Column-I with their properties listed in Column-II Column IColumn II(a)[Co(NH3)4(H2O)2]Cl2(p)Geometrical isomers(b)[Pt(NH3)2Cl2](q)Paramagnetic(c)[Co(H2O)5Cl]Cl(r)Diamagnetic(d)[Ni(H2O)6]Cl2(s)Metal ion with + 2 oxidation state

Answer»

Match the complexes in Column-I with their properties listed in Column-II

$\begin{matrix} Column I & Column II (a) & [C o (N H_{3})_{4} (H_{2} O)_{2}] C l_{2} & (p) & Geometrical isomers (b) & [P t (N H_{3})_{2} C l_{2}] & (q) & Paramagnetic (c) & [C o (H_{2} O)_{5} C l] C l & (r) & Diamagnetic (d) & [N i (H_{2} O)_{6}] C l_{2} & (s) & Metal ion with + 2 oxidation state \end{matrix}$

Discussion

20.	Reaction of Br2 on ethylene in presence of NaCl gives
Answer» Reaction of $B r_{2}$ on ethylene in presence of NaCl gives

Discussion

21.	Which of the following compound on treatment with conc. aqueous alkali and on further acidification gives the following lactone?
Answer» Which of the following compound on treatment with conc. aqueous alkali and on further acidification gives the following lactone?

Discussion

22.	For molecular formula XeOxF5−x, x can be any value from 0 to 5 for which the dipole moment of the molecule(s) is/are zero. Find the sum of all the values of (5−x).
Answer» For molecular formula $X e O_{x} F_{5 - x}$ , $x$ can be any value from $0$ to $5$ for which the dipole moment of the molecule(s) is/are zero. Find the sum of all the values of $(5 - x)$ .

Discussion

23.	How much charge is required for the following reductions : (i) 1 mole of Al3+ to Al ? (ii) 1 mole of Cu2+ to Cu ? (iii) 1 mole of MnO−4 to Mn2+ ?
Answer» How much charge is required for the following reductions : (i) 1 mole of $A l^{3 +}$ to Al ? (ii) 1 mole of $C u^{2 +}$ to Cu ? (iii) 1 mole of $M n O_{4}^{-} t o M n^{2 +}$ ?

23.

How much charge is required for the following reductions : (i) 1 mole of Al3+ to Al ? (ii) 1 mole of Cu2+ to Cu ? (iii) 1 mole of MnO−4 to Mn2+ ?

Answer»

How much charge is required for the following reductions :

(i) 1 mole of $A l^{3 +}$ to Al ?

(ii) 1 mole of $C u^{2 +}$ to Cu ?

(iii) 1 mole of $M n O_{4}^{-} t o M n^{2 +}$ ?

Discussion

24.	How adsorption helps in chromatography in detail
Answer» How adsorption helps in chromatography in detail

Discussion

25.	a compound is formed by three elements P, Q, R. Atoms of the element R form cup, atoms of P occupy 2/3rd of tetrahedral voids and Q atoms at the edge centre of the cube. What is the formula of the compound?
Answer» a compound is formed by three elements P, Q, R. Atoms of the element R form cup, atoms of P occupy 2/3rd of tetrahedral voids and Q atoms at the edge centre of the cube. What is the formula of the compound?

Discussion

26.	are there any gas in liquids solutions for which dissolution is an endothermic process?
Answer» are there any gas in liquids solutions for which dissolution is an endothermic process?

Discussion

27.	Consider a reaction: N2 (g)+3H2 (g)⇌2NH3 (g) Given that , Keq=7×105 ΔS∘NH3=−23.66 cal mol−1K−1 Both the values are at 300K Find the value of ΔH∘NH3 at 300 K Take ln(7)=1.95
Answer» Consider a reaction: $N_{2} (g) + 3 H_{2} (g) ⇌ 2 N H_{3} (g)$ Given that , $K_{e q} = 7 \times 10^{5}$ $Δ S_{N H_{3}}^{\circ} = - 23.66 c a l m o l^{- 1} K^{- 1}$ Both the values are at 300K Find the value of $Δ H_{N H_{3}}^{\circ}$ at 300 K Take $l n (7) = 1.95$

Discussion

28.	WHAT IS ADDITION REACTION AND SUBSTITUTION REACTION
Answer» WHAT IS ADDITION REACTION AND SUBSTITUTION REACTION

Discussion

29.	What is the final product C, of the following reaction sequence?
Answer» What is the final product $C$ , of the following reaction sequence?

Discussion

30.	Ratio of heavy water to ordinary water
Answer» Ratio of heavy water to ordinary water

Discussion

31.	If at 298 K the bond energies of C - H, C - C, C=C and H - H bonds are respectively 414, 347, 615 and 435 kJ mol−1, the value of enthalpy change for the reaction CH2=CH2(g)+H2(g)→CH3−CH3 is:
Answer» If at 298 K the bond energies of C - H, C - C, C=C and H - H bonds are respectively 414, 347, 615 and 435 kJ $m o l^{- 1}$ , the value of enthalpy change for the reaction $C H_{2} = C H_{2} (g) + H_{2} (g) \to C H_{3} - C H_{3}$ is:

Discussion

32.	Oxidation number of chlorine(Cl) atoms in HClO4 and HClO3 molecules are :
Answer» Oxidation number of chlorine $(C l)$ atoms in $H C l O_{4}$ and $H C l O_{3}$ molecules are :

Discussion

33.	10800C ofelectricity through the electrolyte deposited 2. 977 gram of metal with atomic mass of 106.4 gram per mole find the charge on the metal cations
Answer» 10800C ofelectricity through the electrolyte deposited 2. 977 gram of metal with atomic mass of 106.4 gram per mole find the charge on the metal cations

Discussion

34.	The pH of 0.002M NaOH solution is nearly A)2.71. B)6.96 C)7.04. D)11.30
Answer» The pH of 0.002M NaOH solution is nearly A)2.71. B)6.96 C)7.04. D)11.30

34.

The pH of 0.002M NaOH solution is nearly A)2.71. B)6.96 C)7.04. D)11.30

Answer»

The pH of 0.002M NaOH solution is nearly

A)2.71. B)6.96 C)7.04. D)11.30

Discussion

35.	When do we use the formula , Normalityequivalent weight volume divided by 1000
Answer» When do we use the formula , Normalityequivalent weight volume divided by 1000

35.

When do we use the formula , Normalityequivalent weight volume divided by 1000

Answer»

When do we use the formula ,

Normality*equivalent weight *volume divided by 1000

Discussion

36.	What electrolysis is a non - spontaneous reaction?
Answer» What electrolysis is a non - spontaneous reaction?

Discussion

37.	What are the Observations of cathode ray experiment
Answer» What are the Observations of cathode ray experiment

Discussion

38.	In the nitration of benzene using a mixture of conc. H2SO4 and conc. HNO3 the Species which initiates the reaction is_______________
Answer» In the nitration of benzene using a mixture of conc. H₂SO₄ and conc. HNO₃ the Species which initiates the reaction is_______________

Discussion

39.	If the density of CH3OH is 0.793 kg/L . What is its volume needed for making 2.5L of its 0.25(M) solution?
Answer» If the density of CH3OH is 0.793 kg/L . What is its volume needed for making 2.5L of its 0.25(M) solution?

39.

If the density of CH3OH is 0.793 kg/L . What is its volume needed for making 2.5L of its 0.25(M) solution?

Answer»

If the density of CH3OH is 0.793 kg/L .

What is its volume needed for making 2.5L of its 0.25(M) solution?

Discussion

40.	In Millikan oil drop method what is used in between 2 plates.vaccum or any gas
Answer» In Millikan oil drop method what is used in between 2 plates.vaccum or any gas

Discussion

41.	Most efficient overlapping is (a)sp2−sp2 (b)sp3−sp3 (c)s−s (d)sp−sp Explain
Answer» Most efficient overlapping is (a) $s p^{2}$ − $s p^{2}$ (b) $s p^{3}$ − $s p^{3}$ (c)s−s (d)sp−sp Explain

41.

Most efficient overlapping is (a)sp2−sp2 (b)sp3−sp3 (c)s−s (d)sp−sp Explain

Answer»

Most efficient overlapping is

(a) $s p^{2}$ − $s p^{2}$

(b) $s p^{3}$ − $s p^{3}$

(c)s−s

(d)sp−sp

Explain

Discussion

42.	When common salt is dissolved in water:
Answer» When common salt is dissolved in water:

Discussion

43.	Arrange Si,Be,Mg,Na and P in the decreasing order of their metallic character.
Answer» Arrange $S i, B e, M g, N a$ and $P$ in the decreasing order of their metallic character.

Discussion

44.	Balance the equation using oxidation method in steps Zn+ HNO3 ------- >ZN(NO3)2 +NH4NO3+ H2O
Answer» Balance the equation using oxidation method in steps Zn+ HNO3 ------- >ZN(NO3)2 +NH4NO3+ H2O

Discussion

45.	What is a polyblend?
Answer» What is a polyblend?

Discussion

46.	Calculate the number of gram atoms and gram molecules of sulphur S8 in 8g of sulphur,atomic mass of sulphur =32
Answer» Calculate the number of gram atoms and gram molecules of sulphur S8 in 8g of sulphur,atomic mass of sulphur =32

Discussion

47.	What is correct sequence of bond order
Answer» What is correct sequence of bond order

Discussion

48.	What is a soft soap?
Answer» What is a soft soap?

Discussion

49.	Assertion (A): Ammonical cupric tartarate does not oxidise propanone. Reason (R): Cupric tratarate is a mild oxidant and it cannot cleave C-C bond of propanone.
Answer» Assertion (A): Ammonical cupric tartarate does not oxidise propanone. Reason (R): Cupric tratarate is a mild oxidant and it cannot cleave C-C bond of propanone.

Discussion

50.	The reversible expansion of an ideal gas under adiabatic and isothermal conditions is shown in the figure. Which of the following statement(s) is (are) correct?
Answer» The reversible expansion of an ideal gas under adiabatic and isothermal conditions is shown in the figure. Which of the following statement(s) is (are) correct?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A dilute solution Contains “x” moles of solute “A” in 1 kg of solvent with molal elevation constant kb. The solute dimerises in the solution according to the following equation. The degree of association is (α) 2A⇌A2 The degree of association is equal to

Why does NO2 dimerise ?

The best reagent to convert pent-3-en-2-ol into pent-3-en-2-one is:

The energy required to remove an electron from the surface of Na metal is 2.3 eV. What is the largest wavelength of radiation which can show the photoelectric effect:

The threshold wavelength for photoelectric emission from a material is 5200˙A. Photoelectrons will be emitted when this material is illuminated with monochromatic radiation from a

B2O3 + C + Cl2→A + B. A &amp; B are?

An object having uniform linear mass density is in equilibrium as shown in the diagram. The value of lr is ___

Write Einstein’s photoelectric effect equation and explain symbols used.

A first order reaction is 50% completed in 1.26×1014s . How much time would it take for 100% completion?

In the standardization of Na2S2O3 using K2Cr2O7 by iodometry , the equivalent weight of K2Cr2O7 is : (Given : Molecular weight of K2Cr2O7 is 294 g)

The first ionisation energy is maximum for:

A polyatomic gas (γ=43) is compressed to 18 of its volume adiabatically and reversibly. If its initial pressure is P0 its new pressure will be

Which is the weakest base

E° cell for the given redox reaction is 2.71 V Mg(s)+Cu2+(0.01M)→Mg2+(0.001M)+Cu(s) Calculate Ecell for the reaction. Write the direction of flow of current when an external opposite potential applied is (i) less than 2.71 V and (ii) greater than 2.71 V

Pressure of 1 g of an ideal gas A at 27∘C is found to be 2 bar. When 2 g of another ideal gas B is introduced in the same flask at the same temperature, the pressure becomes 3 bar. Find a relationship between their molecular masses.

In hydrogen a atom, an electric is revolving in the orbit of radius 0.53 ̇ with 6.6x1015 radiations/s. Magnetic field produced at the centre of the orbit is A) 0.125 Wb/m2 B) 1.25 Wb/m2 C) 12.5 Wb/m2 D) 125 Wb/m2

Find the work done in J when one mole of an ideal gas in 10 litre container at 1 atm is allowed to enter into an evacuated bulb of capacity 100 litre

Match the complexes in Column-I with their properties listed in Column-II Column IColumn II(a)[Co(NH3)4(H2O)2]Cl2(p)Geometrical isomers(b)[Pt(NH3)2Cl2](q)Paramagnetic(c)[Co(H2O)5Cl]Cl(r)Diamagnetic(d)[Ni(H2O)6]Cl2(s)Metal ion with + 2 oxidation state

Reaction of Br2 on ethylene in presence of NaCl gives

Which of the following compound on treatment with conc. aqueous alkali and on further acidification gives the following lactone?

For molecular formula XeOxF5−x, x can be any value from 0 to 5 for which the dipole moment of the molecule(s) is/are zero. Find the sum of all the values of (5−x).

How much charge is required for the following reductions : (i) 1 mole of Al3+ to Al ? (ii) 1 mole of Cu2+ to Cu ? (iii) 1 mole of MnO−4 to Mn2+ ?

How adsorption helps in chromatography in detail

a compound is formed by three elements P, Q, R. Atoms of the element R form cup, atoms of P occupy 2/3rd of tetrahedral voids and Q atoms at the edge centre of the cube. What is the formula of the compound?

are there any gas in liquids solutions for which dissolution is an endothermic process?

Consider a reaction: N2 (g)+3H2 (g)⇌2NH3 (g) Given that , Keq=7×105 ΔS∘NH3=−23.66 cal mol−1K−1 Both the values are at 300K Find the value of ΔH∘NH3 at 300 K Take ln(7)=1.95

WHAT IS ADDITION REACTION AND SUBSTITUTION REACTION

What is the final product C, of the following reaction sequence?

Ratio of heavy water to ordinary water

If at 298 K the bond energies of C - H, C - C, C=C and H - H bonds are respectively 414, 347, 615 and 435 kJ mol−1, the value of enthalpy change for the reaction CH2=CH2(g)+H2(g)→CH3−CH3 is:

Oxidation number of chlorine(Cl) atoms in HClO4​ and HClO3​ molecules are :

10800C ofelectricity through the electrolyte deposited 2. 977 gram of metal with atomic mass of 106.4 gram per mole find the charge on the metal cations

The pH of 0.002M NaOH solution is nearly A)2.71. B)6.96 C)7.04. D)11.30

When do we use the formula , Normality*equivalent weight *volume divided by 1000

What electrolysis is a non - spontaneous reaction?

What are the Observations of cathode ray experiment

In the nitration of benzene using a mixture of conc. H2SO4 and conc. HNO3 the Species which initiates the reaction is_______________

If the density of CH3OH is 0.793 kg/L . What is its volume needed for making 2.5L of its 0.25(M) solution?

In Millikan oil drop method what is used in between 2 plates.vaccum or any gas

Most efficient overlapping is (a)sp2−sp2 (b)sp3−sp3 (c)s−s (d)sp−sp Explain

When common salt is dissolved in water:

Arrange Si,Be,Mg,Na and P in the decreasing order of their metallic character.

Balance the equation using oxidation method in steps Zn+ HNO3 ------- >ZN(NO3)2 +NH4NO3+ H2O

What is a polyblend?

Calculate the number of gram atoms and gram molecules of sulphur S8 in 8g of sulphur,atomic mass of sulphur =32

What is correct sequence of bond order

What is a soft soap?

Assertion (A): Ammonical cupric tartarate does not oxidise propanone. Reason (R): Cupric tratarate is a mild oxidant and it cannot cleave C-C bond of propanone.

The reversible expansion of an ideal gas under adiabatic and isothermal conditions is shown in the figure. Which of the following statement(s) is (are) correct?

B2O3 + C + Cl2→A + B. A & B are?

Oxidation number of chlorine(Cl) atoms in HClO4 and HClO3 molecules are :

When do we use the formula , Normalityequivalent weight volume divided by 1000