46295 + Interview Questions in Chemistry

1.	The blue coloured mineral ‘Lapis Lazuli’ which is used as semiprecious stone is a mineral of the following class.
Answer» The blue coloured mineral ‘Lapis Lazuli’ which is used as semiprecious stone is a mineral of the following class.

Discussion

2.	If the radius of 3rd Bohr’s orbit of H-atom is r, then the radius of 4th Bohr’s orbit of He+ would be
Answer» If the radius of $3^{r d}$ Bohr’s orbit of H-atom is r, then the radius of $4^{t h}$ Bohr’s orbit of $H e^{+}$ would be

Discussion

3.	Analyze the generalized rate data for the reaction RX+Nu−⟶ Nucleophilic Product S. No.[RX]Substrate[Nu] Attacking speciesRate of reaction(Ms−1)1.0.10 M0.10 M1.2×10−42.0.20 M0.10 M2.4×10−43.0.10 M0.20 M2.4×10−44.0.20 M0.20 M4.8×10−4 Which of the following is the most appropriate potential energy v/s reaction coordinate diagram of the reaction on the basis of above data analysis?
Answer» Analyze the generalized rate data for the reaction $R X + N u^{-} ⟶$ Nucleophilic Product $\begin{matrix} S. No. & [RX]Substrate & [Nu] Attacking species & Rate of reaction (M s^{- 1}) 1. & 0.10 M & 0.10 M & 1.2 \times 10^{- 4} 2. & 0.20 M & 0.10 M & 2.4 \times 10^{- 4} 3. & 0.10 M & 0.20 M & 2.4 \times 10^{- 4} 4. & 0.20 M & 0.20 M & 4.8 \times 10^{- 4} \end{matrix}$ Which of the following is the most appropriate potential energy v/s reaction coordinate diagram of the reaction on the basis of above data analysis?

Discussion

4.	Compounds showing cannizaro's reaction are (i) CH3CH2CHO (ii) CHCl2CHO (iii) (CH3)3C−CHO (iv)C6H5CHO
Answer» Compounds showing cannizaro's reaction are (i) $C H_{3} C H_{2} C H O$ (ii) $C H C l_{2} C H O$ (iii) $(C H_{3})_{3} C - C H O$ (iv) $C_{6} H_{5} C H O$

Discussion

5.	How can phenol be converted to aspirin?
Answer» How can phenol be converted to aspirin?

Discussion

6.	Isotherms of carbon dioxide gas are shown in figure. Mark a path for changing gas into liquid such that only one phase (i.e., either a gas or a liquid) exists at any time during the change. Explain how the temeprature, volume and pressure should be changed to carry out the change?
Answer» Isotherms of carbon dioxide gas are shown in figure. Mark a path for changing gas into liquid such that only one phase (i.e., either a gas or a liquid) exists at any time during the change. Explain how the temeprature, volume and pressure should be changed to carry out the change?

Discussion

7.	Find the final product (C) in the following reaction sequence.
Answer» Find the final product (C) in the following reaction sequence.

Discussion

8.	With increase in surface area of adsorbent, chemical adsorption:
Answer» With increase in surface area of adsorbent, chemical adsorption:

Discussion

9.	(a) The cell in which the following reaction occurs: 2Fe3+(aq)+2I−(aq)→2Fe2+(aq)+I2(s) has E⊝cell=0.236V at 298 K. Calculate the standard Gibbs energy of the cell reaction. (Given: 2F= 96500 C mol−1) (b) How many electrons flow through a metallic wire if a current of 0.5 A is passed for 2 hours? (Given: 1F= 96500 C mol−1)
Answer» (a) The cell in which the following reaction occurs: $2 F e^{3 +} (a q) + 2 I^{-} (a q) \to 2 F e^{2 +} (a q) + I_{2} (s)$ has $E_{cell}^{⊝} = 0.236 V$ at 298 K. Calculate the standard Gibbs energy of the cell reaction. (Given: 2F= 96500 C $m o l^{- 1}$ ) (b) How many electrons flow through a metallic wire if a current of 0.5 A is passed for 2 hours? (Given: 1F= 96500 C $m o l^{- 1}$ )

Discussion

10.	What is the cause behind the formation of hydrogen bond
Answer» What is the cause behind the formation of hydrogen bond

Discussion

11.	The absolute temperature of a gas is determined by
Answer» The absolute temperature of a gas is determined by

Discussion

12.	The shortest distance between the 1st and 4th layer in hcp arrangement is what?
Answer» The shortest distance between the 1st and 4th layer in hcp arrangement is what?

Discussion

13.	Which of the following is an example of coordination compound? a)CoCl3.6NH3 b)KCl.MgCl2.6H2O c)FeSO4.6H2O d)FeSO4.(NH4)2SO4.6H2O
Answer» Which of the following is an example of coordination compound? a)CoCl₃.6NH₃b)KCl.MgCl₂.6H₂O c)FeSO₄.6H₂O d)FeSO₄.(NH₄)₂SO₄.6H₂O

Discussion

14.	Which one of the following elements is unable to form MF3–6 ion?
Answer» Which one of the following elements is unable to form $M F_{6}^{3 -}$ ion?

Discussion

15.	The entropy change involved in the isothermal reversible expansion of 2 mole of an ideal gas from a volume of 10 dm3 to a volume of 100 dm3 at 27∘C is :
Answer» The entropy change involved in the isothermal reversible expansion of 2 mole of an ideal gas from a volume of $10 d m^{3}$ to a volume of $100 d m^{3}$ at $27^{\circ} C$ is :

Discussion

16.	How to balance the charge in oxidation number method please explain by giving an example?
Answer» How to balance the charge in oxidation number method please explain by giving an example?

Discussion

17.	The total number of lone pair of electron in melamine is 6 ? How -_-? it should be answer 3!? :( please explain this..!
Answer» The total number of lone pair of electron in melamine is 6 ? How -_-? it should be answer 3!? :( please explain this..!

Discussion

18.	Which of the following denotes 5p?
Answer» Which of the following denotes 5p?

Discussion

19.	A certain reaction is non-spontaneous at 298 K. The entropy change during the reaction is 121 J/K. What is the minimum value of △H (in kJ) for the reaction.
Answer» A certain reaction is non-spontaneous at 298 K. The entropy change during the reaction is 121 J/K. What is the minimum value of $△ H$ (in $k J$ ) for the reaction.

Discussion

20.	Two moles of helium gas (γ=5/3) are initially at a temperature of 27oC and occupy a volume of 20 litre. The gas is first expanded at constant pressure until the volume is doubled. It then undergoes adiabatic change until the temperature returns to its initial value. If total work done by the gas is −x kcal, then what is x?
Answer» Two moles of helium gas ( $γ = 5 / 3$ ) are initially at a temperature of $27^{o} C$ and occupy a volume of $20 l i t r e$ . The gas is first expanded at constant pressure until the volume is doubled. It then undergoes adiabatic change until the temperature returns to its initial value. If total work done by the gas is $- x k c a l$ , then what is $x$ ?

Discussion

21.	At 0.1 atm and 25∘C, compressibility factor of four gases A, B, C and D are 0.25, 1.3, 1 and 0.7 respectively. The gas which is most easily liquifiable at 25∘C, will be.
Answer» At $0.1 a t m$ and $25^{\circ} C$ , compressibility factor of four gases $A, B, C$ and $D$ are $0.25, 1.3, 1 a n d 0.7$ respectively. The gas which is most easily liquifiable at $25^{\circ} C,$ will be.

Discussion

22.	How many grams of sodium carbonate is obtained by heating 8.4 g of NaHCO3(s)?
Answer» How many grams of sodium carbonate is obtained by heating $8.4 g$ of $N a H C O_{3} (s)$ ?

Discussion

23.	Explain Hoffmann elimination.undefinedundefinedundefinedundefined
Answer» Explain Hoffmann elimination. undefined undefined undefined undefined

Discussion

24.	Considering the elements B, C, N, F, and Si, the correct order of their non-metallic character is: (a) B > C > Si > N > F b) Si > C > B > N > F (c) F > N > C > B > Si d) F > N > C > Si > B
Answer» Considering the elements B, C, N, F, and Si, the correct order of their non-metallic character is: (a) B > C > Si > N > F b) Si > C > B > N > F (c) F > N > C > B > Si d) F > N > C > Si > B

Discussion

25.	The correct statement(s) for othoboric acid is/are
Answer» The correct statement(s) for othoboric acid is/are

Discussion

26.	What will be the normality of the solution obtained by mixing 50 mL of 0.2 M H2SO4 with 50 mL of 0.1 N Ca(OH)2 ?
Answer» What will be the normality of the solution obtained by mixing $50 m L$ of $0.2 M H_{2} S O_{4}$ with $50 m L$ of $0.1 N C a (O H)_{2}$ ?

Discussion

27.	Six Identical particles each of mass 'm' are arranged at the corners of a hexagon each side of length L. If mass of one particle was removed then shift in the centre of mass is?
Answer» Six Identical particles each of mass 'm' are arranged at the corners of a hexagon each side of length L. If mass of one particle was removed then shift in the centre of mass is?

Discussion

28.	Which of the following conversions involve change in both shape and hybridisation? a) CH4 -> C2H6 b) NH3 -> NH4+ c) BF3 -> BF4- d) H2O ->H3O+
Answer» Which of the following conversions involve change in both shape and hybridisation? a) CH4 -> C2H6 b) NH3 -> NH4+ c) BF3 -> BF4- d) H2O ->H3O+

28.

Which of the following conversions involve change in both shape and hybridisation? a) CH4 -> C2H6 b) NH3 -> NH4+ c) BF3 -> BF4- d) H2O ->H3O+

Answer»

Which of the following conversions involve change in both shape and hybridisation?

a) CH4 -> C2H6

b) NH3 -> NH4+

c) BF3 -> BF4-

d) H2O ->H3O+

Discussion

29.	Which of the following conformation of cyclohexane is chiral
Answer» Which of the following conformation of cyclohexane is chiral

Discussion

30.	An element belongs to 3rd period and group 13 of the periodic table. Which of the following properties will be shown by the element? (a) Good conductor of electricity (b) liquid, metallic (c) solid , metallic (d) Solid, non-metallic
Answer» An element belongs to 3rd period and group 13 of the periodic table. Which of the following properties will be shown by the element? (a) Good conductor of electricity (b) liquid, metallic (c) solid , metallic (d) Solid, non-metallic

Discussion

31.	Considering the elements B, Al, Mg and K, the correct order of their metallic character is:
Answer» Considering the elements $B, A l, M g$ and $K$ , the correct order of their metallic character is:

Discussion

32.	Which of the following does not show optical isomerism? (en = ethylenediamine)
Answer» Which of the following does not show optical isomerism? (en = ethylenediamine)

32.

Which of the following does not show optical isomerism? (en = ethylenediamine)

Answer»

Which of the following does not show optical isomerism?

(en = ethylenediamine)

Discussion

33.	What is the radial probability vs time graph? Is it even possible? I have heard of radial probability vs distance from nucleus, but time? It's totally unimaginable.
Answer» What is the radial probability vs time graph? Is it even possible? I have heard of radial probability vs distance from nucleus, but time? It's totally unimaginable.

33.

What is the radial probability vs time graph? Is it even possible? I have heard of radial probability vs distance from nucleus, but time? It's totally unimaginable.

Answer»

What is the radial probability vs time graph?

Is it even possible? I have heard of radial probability vs distance from nucleus, but time? It's totally unimaginable.

Discussion

34.	Among the following the maximum covalent character is shown by the compound .
Answer» Among the following the maximum covalent character is shown by the compound .

Discussion

35.	AB, A2 and B2 are diatomic molecules. If the bond enthalpies of A2, AB and B2 are in the ratio 1 : 1 : 0.5 respectively and enthalpy of formation of AB from A2 and B2 is −100 kJ/mol−1. What is the bond enthalpy of A2 ?
Answer» $A B$ , $A_{2}$ and $B_{2}$ are diatomic molecules. If the bond enthalpies of $A_{2}, A B$ and $B_{2}$ are in the ratio 1 : 1 : 0.5 respectively and enthalpy of formation of $A B$ from $A_{2}$ and $B_{2}$ is $- 100 {kJ/mol}^{- 1}$ . What is the bond enthalpy of $A_{2}$ ?

Discussion

36.	Which of the following amines is/are resolvable?
Answer» Which of the following amines is/are resolvable?

Discussion

37.	Find the product of 6abc and -2cab.
Answer» Find the product of 6abc and -2cab.

Discussion

38.	Match each product in LIST-I with one or more reaction in LIST-II and choose the correct option. R is an anion, pKa,RH=5 Column - IColumn - II(1M each)(P) 10mL RH+10mL NaOH(1) pH<5(Q) 20mL RH+10mL NaOH(2) pH=5(R) 10mL RH+20mL NaOH(3) pH>5(S) 10mL RH+20mL HCl(4) buffer
Answer» Match each product in LIST-I with one or more reaction in LIST-II and choose the correct option. R is an anion, $p K_{a}, R H = 5$ $\begin{matrix} Column - I & Column - II (1M each) (P) 10 m L R H + 10 m L N a O H & (1) p H < 5 (Q) 20 m L R H + 10 m L N a O H & (2) p H = 5 (R) 10 m L R H + 20 m L N a O H & (3) p H > 5 (S) 10 m L R H + 20 m L H C l & (4) buffer \end{matrix}$

Discussion

39.	During concentration of ore by froth flotation, the ore particles float on surface because: A.)ore are insoluble B.)sulphide ores are lighter C.)the surface is not wetter by water D.)difference in densities
Answer» During concentration of ore by froth flotation, the ore particles float on surface because: A.)ore are insoluble B.)sulphide ores are lighter C.)the surface is not wetter by water D.)difference in densities

39.

During concentration of ore by froth flotation, the ore particles float on surface because: A.)ore are insoluble B.)sulphide ores are lighter C.)the surface is not wetter by water D.)difference in densities

Answer»

During concentration of ore by froth flotation, the ore particles float on surface because:

A.)ore are insoluble

B.)sulphide ores are lighter

C.)the surface is not wetter by water

D.)difference in densities

Discussion

40.	An element with atomic mass z has two isotopes having atomic masses (z-1) and (z+2). Find out the percentage abundance of heavier isotope.
Answer» An element with atomic mass z has two isotopes having atomic masses (z-1) and (z+2). Find out the percentage abundance of heavier isotope.

Discussion

41.	Why C6H5CL forms Ortho, para product but C6H5CCl3 form meta product?
Answer» Why C6H5CL forms Ortho, para product but C6H5CCl3 form meta product?

Discussion

42.	Point defects are present in
Answer» Point defects are present in

Discussion

43.	The vapour pressure of water at 300 Kelvin in a closed container is 0.48 atm if the volume of container is doubled it vapour pressure at 300 Kelvin will be________
Answer» The vapour pressure of water at 300 Kelvin in a closed container is 0.48 atm if the volume of container is doubled it vapour pressure at 300 Kelvin will be________

Discussion

44.	One of the following amide will not undergo Hoffmann bromamide reaction:
Answer» One of the following amide will not undergo Hoffmann bromamide reaction:

Discussion

45.	In the reaction: C6H5CHO+C6H5NH2→[A]Ni/H2−−−−→Δ[B] The product [B] is:
Answer» In the reaction: $C_{6} H_{5} C H O + C_{6} H_{5} N H_{2} \to [A] N i / H_{2} - --- \to Δ [B]$ The product [B] is:

Discussion

46.	Which of the following is least soluble in H2O?
Answer» Which of the following is least soluble in $H_{2} O$ ?

Discussion

47.	A deliquescent white crystalline solid hydroxide ‘X’ reacts with nitrate ‘Y’ to form another hydroxide which decomposes to give an insoluble brown layer of its oxide. X is a powerful cautery and breaks down the proteins of skin flesh to a pasty mass. X and Y are
Answer» A deliquescent white crystalline solid hydroxide ‘X’ reacts with nitrate ‘Y’ to form another hydroxide which decomposes to give an insoluble brown layer of its oxide. X is a powerful cautery and breaks down the proteins of skin flesh to a pasty mass. X and Y are

Discussion

48.	Sulphuric acid is manufactured by:
Answer» Sulphuric acid is manufactured by:

Discussion

49.	The percentage of empty space in a body centred cubic arrangement is ............... (a) 74 (b) 68 (c) 32 (d) 26
Answer» The percentage of empty space in a body centred cubic arrangement is ............... (a) 74 (b) 68 (c) 32 (d) 26

49.

The percentage of empty space in a body centred cubic arrangement is ............... (a) 74 (b) 68 (c) 32 (d) 26

Answer»

The percentage of empty space in a body centred cubic arrangement is ...............

(a) 74 (b) 68 (c) 32 (d) 26

Discussion

50.	A chemical A is used for the preparation of washing soda to recover ammonia. When CO2 is bubbled through an aqueous solution of A, the solution turns milky. It is used in white washing due to disinfectant nature. What is the chemical formula of A? (a) Ca(HCO3)2 (b) CaO (c) Ca(OH)2 (d) CaCO3
Answer» A chemical A is used for the preparation of washing soda to recover ammonia. When $C O_{2}$ is bubbled through an aqueous solution of A, the solution turns milky. It is used in white washing due to disinfectant nature. What is the chemical formula of A? (a) $C a (H C O_{3})_{2}$ (b) CaO (c) $C a (O H)_{2}$ (d) $C a C O_{3}$

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The blue coloured mineral ‘Lapis Lazuli’ which is used as semiprecious stone is a mineral of the following class.

If the radius of 3rd Bohr’s orbit of H-atom is r, then the radius of 4th Bohr’s orbit of He+ would be

Compounds showing cannizaro's reaction are (i) CH3CH2CHO (ii) CHCl2CHO (iii) (CH3)3C−CHO (iv)C6H5CHO

How can phenol be converted to aspirin?

Isotherms of carbon dioxide gas are shown in figure. Mark a path for changing gas into liquid such that only one phase (i.e., either a gas or a liquid) exists at any time during the change. Explain how the temeprature, volume and pressure should be changed to carry out the change?

Find the final product (C) in the following reaction sequence.

With increase in surface area of adsorbent, chemical adsorption:

What is the cause behind the formation of hydrogen bond

The absolute temperature of a gas is determined by

The shortest distance between the 1st and 4th layer in hcp arrangement is what?

Which of the following is an example of coordination compound? a)CoCl3.6NH3 b)KCl.MgCl2.6H2O c)FeSO4.6H2O d)FeSO​​​4.(NH​​​​​4)2SO4​​​.6H2O

Which one of the following elements is unable to form MF3–6 ion?

The entropy change involved in the isothermal reversible expansion of 2 mole of an ideal gas from a volume of 10 dm3 to a volume of 100 dm3 at 27∘C is :

How to balance the charge in oxidation number method please explain by giving an example?

The total number of lone pair of electron in melamine is 6 ? How -_-? it should be answer 3!? :( please explain this..!

Which of the following denotes 5p?

A certain reaction is non-spontaneous at 298 K. The entropy change during the reaction is 121 J/K. What is the minimum value of △H (in kJ) for the reaction.

At 0.1 atm and 25∘C, compressibility factor of four gases A, B, C and D are 0.25, 1.3, 1 and 0.7 respectively. The gas which is most easily liquifiable at 25∘C, will be.

How many grams of sodium carbonate is obtained by heating 8.4 g of NaHCO3(s)?

Explain Hoffmann elimination.undefinedundefinedundefinedundefined

Considering the elements B, C, N, F, and Si, the correct order of their non-metallic character is: (a) B &gt; C &gt; Si &gt; N &gt; F b) Si &gt; C &gt; B &gt; N &gt; F (c) F &gt; N &gt; C &gt; B &gt; Si d) F &gt; N &gt; C &gt; Si &gt; B

The correct statement(s) for othoboric acid is/are

What will be the normality of the solution obtained by mixing 50 mL of 0.2 M H2SO4​ with 50 mL of 0.1 N Ca(OH)2 ?

Six Identical particles each of mass 'm' are arranged at the corners of a hexagon each side of length L. If mass of one particle was removed then shift in the centre of mass is?

Which of the following conversions involve change in both shape and hybridisation? a) CH4 -&gt; C2H6 b) NH3 -&gt; NH4+ c) BF3 -&gt; BF4- d) H2O -&gt;H3O+

Which of the following conformation of cyclohexane is chiral

An element belongs to 3rd period and group 13 of the periodic table. Which of the following properties will be shown by the element? (a) Good conductor of electricity (b) liquid, metallic (c) solid , metallic (d) Solid, non-metallic

Considering the elements B, Al, Mg and K, the correct order of their metallic character is:

Which of the following does not show optical isomerism? (en = ethylenediamine)

What is the radial probability vs time graph? Is it even possible? I have heard of radial probability vs distance from nucleus, but time? It's totally unimaginable.

Among the following the maximum covalent character is shown by the compound .

AB, A2 and B2 are diatomic molecules. If the bond enthalpies of A2, AB and B2 are in the ratio 1 : 1 : 0.5 respectively and enthalpy of formation of AB from A2 and B2 is −100 kJ/mol−1. What is the bond enthalpy of A2 ?

Which of the following amines is/are resolvable?

Find the product of 6abc and -2cab.

Match each product in LIST-I with one or more reaction in LIST-II and choose the correct option. R is an anion, pKa,RH=5 Column - IColumn - II(1M each)(P) 10mL RH+10mL NaOH(1) pH&lt;5(Q) 20mL RH+10mL NaOH(2) pH=5(R) 10mL RH+20mL NaOH(3) pH&gt;5(S) 10mL RH+20mL HCl(4) buffer

During concentration of ore by froth flotation, the ore particles float on surface because: A.)ore are insoluble B.)sulphide ores are lighter C.)the surface is not wetter by water D.)difference in densities

An element with atomic mass z has two isotopes having atomic masses (z-1) and (z+2). Find out the percentage abundance of heavier isotope.

Why C6H5CL forms Ortho, para product but C6H5CCl3 form meta product?

Point defects are present in

The vapour pressure of water at 300 Kelvin in a closed container is 0.48 atm if the volume of container is doubled it vapour pressure at 300 Kelvin will be________

One of the following amide will not undergo Hoffmann bromamide reaction:

In the reaction: C6H5CHO+C6H5NH2→[A]Ni/H2−−−−→Δ[B] The product [B] is:

Which of the following is least soluble in H2O?

A deliquescent white crystalline solid hydroxide ‘X’ reacts with nitrate ‘Y’ to form another hydroxide which decomposes to give an insoluble brown layer of its oxide. X is a powerful cautery and breaks down the proteins of skin flesh to a pasty mass. X and Y are

Sulphuric acid is manufactured by:

The percentage of empty space in a body centred cubic arrangement is ............... (a) 74 (b) 68 (c) 32 (d) 26

A chemical A is used for the preparation of washing soda to recover ammonia. When CO2 is bubbled through an aqueous solution of A, the solution turns milky. It is used in white washing due to disinfectant nature. What is the chemical formula of A? (a) Ca(HCO3)2 (b) CaO (c) Ca(OH)2 (d) CaCO3

Which of the following is an example of coordination compound? a)CoCl3.6NH3 b)KCl.MgCl2.6H2O c)FeSO4.6H2O d)FeSO4.(NH4)2SO4.6H2O

Considering the elements B, C, N, F, and Si, the correct order of their non-metallic character is: (a) B > C > Si > N > F b) Si > C > B > N > F (c) F > N > C > B > Si d) F > N > C > Si > B

What will be the normality of the solution obtained by mixing 50 mL of 0.2 M H2SO4 with 50 mL of 0.1 N Ca(OH)2 ?

Which of the following conversions involve change in both shape and hybridisation? a) CH4 -> C2H6 b) NH3 -> NH4+ c) BF3 -> BF4- d) H2O ->H3O+

Match each product in LIST-I with one or more reaction in LIST-II and choose the correct option. R is an anion, pKa,RH=5 Column - IColumn - II(1M each)(P) 10mL RH+10mL NaOH(1) pH<5(Q) 20mL RH+10mL NaOH(2) pH=5(R) 10mL RH+20mL NaOH(3) pH>5(S) 10mL RH+20mL HCl(4) buffer