46295 + Interview Questions in Chemistry

1.	Out of benzene, m–dinitrobenzene and toluene which will undergo nitration most easily and why?
Answer» Out of benzene, m–dinitrobenzene and toluene which will undergo nitration most easily and why?

Discussion

2.	The species which by definition has ZERO standard Molar enthalpy of formation at 298 k is
Answer» The species which by definition has ZERO standard Molar enthalpy of formation at 298 k is

Discussion

3.	Find the change in pH when 0.1 mol KI is added to 200 ml 0.3 M HI solution. (Assume volume remains constant)___
Answer» Find the change in pH when 0.1 mol KI is added to 200 ml 0.3 M HI solution. (Assume volume remains constant)___

Discussion

4.	The correct explanation for the below reaction is
Answer» The correct explanation for the below reaction is

Discussion

5.	The hybridization involved in BCl3NH3 is:
Answer» The hybridization involved in BCl₃NH₃ is:

Discussion

6.	The strongest reducing agent is (1) Be (2) Mg (3) Sr (4) Ba
Answer» The strongest reducing agent is (1) Be (2) Mg (3) Sr (4) Ba

Discussion

7.	A solution is prepared by dissolving 28g of sugar in 172g of water Calculate the mass percentage of solute.
Answer» A solution is prepared by dissolving 28g of sugar in 172g of water Calculate the mass percentage of solute.

Discussion

8.	Sec-butyl alcohol on heating with conc. H2SO4 at 443K gives
Answer» Sec-butyl alcohol on heating with conc. $H_{2} S O_{4}$ at 443K gives

Discussion

9.	The work done in open vessel at 300 K, when 112 g iron reacts with dil HCl is:
Answer» The work done in open vessel at 300 K, when 112 g iron reacts with dil HCl is:

Discussion

10.	In H2 - O2 fuel cell with 60% efficiency, 5 moles of H2O is formed.What will be the number of faradays of electricity produced?
Answer» In $H_{2}$ - $O_{2}$ fuel cell with 60% efficiency, 5 moles of $H_{2} O$ is formed.What will be the number of faradays of electricity produced?

Discussion

11.	OH− is more basic than SH− because
Answer» $O H^{-}$ is more basic than $S H^{-}$ because

Discussion

12.	A chemical reaction A⇌B is said to be in equilibrium when -
Answer» A chemical reaction $A ⇌ B$ is said to be in equilibrium when -

Discussion

13.	What is oxidation number of hydrogen in NaH?
Answer» What is oxidation number of hydrogen in $N a H$ ?

Discussion

14.	If v is the volume of one molecule of a gas under given conditions then va der Waals' constant b is
Answer» If v is the volume of one molecule of a gas under given conditions then va der Waals' constant b is

Discussion

15.	Chlorination of Toluene in the presence of sunlight gives :
Answer» Chlorination of Toluene in the presence of sunlight gives :

Discussion

16.	Which of the following is an extensive property of system?
Answer» Which of the following is an extensive property of system?

Discussion

17.	If one gram of a metal carbonate gave 0.56g of its oxide on heating then equivalent weight of metal will be
Answer» If one gram of a metal carbonate gave 0.56g of its oxide on heating then equivalent weight of metal will be

Discussion

18.	In terms of period and group where would you locate the element with Z =114?
Answer» In terms of period and group where would you locate the element with Z =114?

Discussion

19.	Question 34.1 Structures of molecules of two compounds are given below. Which of the two compounds will have intermolecular hydrogen bonding and which compound is expected to show intramolecular hydrogen bonding? (ii) The melting point of the compound depends on, among other things, the extent of hydrogen bonding. On this basis explain which of the above two compounds will show higher melting point? (iii) The solubility of compounds in water depends on power to form hydrogen bonds with water. Which of the above compounds will form a hydrogen bond with easily and be more soluble in it?
Answer» Question 34.1 Structures of molecules of two compounds are given below. Which of the two compounds will have intermolecular hydrogen bonding and which compound is expected to show intramolecular hydrogen bonding? (ii) The melting point of the compound depends on, among other things, the extent of hydrogen bonding. On this basis explain which of the above two compounds will show higher melting point? (iii) The solubility of compounds in water depends on power to form hydrogen bonds with water. Which of the above compounds will form a hydrogen bond with easily and be more soluble in it?

19.

Question 34.1 Structures of molecules of two compounds are given below. Which of the two compounds will have intermolecular hydrogen bonding and which compound is expected to show intramolecular hydrogen bonding? (ii) The melting point of the compound depends on, among other things, the extent of hydrogen bonding. On this basis explain which of the above two compounds will show higher melting point? (iii) The solubility of compounds in water depends on power to form hydrogen bonds with water. Which of the above compounds will form a hydrogen bond with easily and be more soluble in it?

Answer»

Question 34.1

Structures of molecules of two compounds are given below.

Which of the two compounds will have intermolecular hydrogen bonding and which compound is expected to show intramolecular hydrogen bonding?

(ii) The melting point of the compound depends on, among other things, the extent of hydrogen bonding. On this basis explain which of the above two compounds will show higher melting point?

(iii) The solubility of compounds in water depends on power to form hydrogen bonds with water. Which of the above compounds will form a hydrogen bond with easily and be more soluble in it?

Discussion

20.	Why melting point belongs to Physical property?
Answer» Why melting point belongs to Physical property?

Discussion

21.	A 100 W power source emits green light having a wavelength of 5000 ∘A. How many photons are emitted per minute by the source?
Answer» A $100 W$ power source emits green light having a wavelength of $5000 \circ A$ . How many photons are emitted per minute by the source?

Discussion

22.	The complex, [Ni(CN)4]2-, has:
Answer» The complex, [Ni(CN)₄]^2-, has:

Discussion

23.	The heats of combustion of carbon and carbon monoxide are -393.5 and -283.5 kJ mol−1, respectively. The heat of formation (in kJ) of carbon monoxide per mole is:
Answer» The heats of combustion of carbon and carbon monoxide are -393.5 and -283.5 kJ $m o l^{- 1}$ , respectively. The heat of formation (in kJ) of carbon monoxide per mole is:

Discussion

24.	whenSO2 is passed in a solution of potassium iodate, the oxidation state of iodine changes from :
Answer» when $S O_{2}$ is passed in a solution of potassium iodate, the oxidation state of iodine changes from :

Discussion

25.	In an aqua sol,
Answer» In an aqua sol,

Discussion

26.	The compound CH3 \| CH3−C=CH−CH3on reaction with NaIO4 in the presence of KMnO4 gives
Answer» The compound $C H_{3} \| C H_{3} - C = C H - C H_{3}$ on reaction with $N a I O_{4}$ in the presence of $K M n O_{4}$ gives

Discussion

27.	The process in which the strength of an unknown solution is calculated using a known standard solution is known as
Answer» The process in which the strength of an unknown solution is calculated using a known standard solution is known as

Discussion

28.	The density of CaO is 3.35 gm/cm3. The oxide crystallises in one of the cubic systems with an edge of 4.80 Å. How many Ca++ ions and O-2 ions belong to each unit cell, and which type of cubic system is present?
Answer» The density of CaO is 3.35 gm/cm³. The oxide crystallises in one of the cubic systems with an edge of 4.80 Å. How many Ca⁺⁺ ions and O^-2 ions belong to each unit cell, and which type of cubic system is present?

Discussion

29.	Q11. Consider the following statements about National Clean Air Programme: 1. It is a medium term national level strategy to tackle the increasing air pollution problem across the country in a comprehensive manner. 2. It envisions setting up only automatic air-quality-monitoring stations. Which of the above statements are correct?
Answer» Q11. Consider the following statements about National Clean Air Programme: 1. It is a medium term national level strategy to tackle the increasing air pollution problem across the country in a comprehensive manner. 2. It envisions setting up only automatic air-quality-monitoring stations. Which of the above statements are correct?

29.

Q11. Consider the following statements about National Clean Air Programme: 1. It is a medium term national level strategy to tackle the increasing air pollution problem across the country in a comprehensive manner. 2. It envisions setting up only automatic air-quality-monitoring stations. Which of the above statements are correct?

Answer»

Q11. Consider the following statements about National Clean Air Programme:

1. It is a medium term national level strategy to tackle the increasing air pollution problem across the country in a comprehensive manner.

2. It envisions setting up only automatic air-quality-monitoring stations.

Which of the above statements are correct?

Discussion

30.	The electron gain enthalpy (in kJ/mol) of Fluorine, Chlorine, Bromine and Iodine, respectively, are:
Answer» The electron gain enthalpy (in kJ/mol) of Fluorine, Chlorine, Bromine and Iodine, respectively, are:

Discussion

31.	An electromagnetic radiation of wavelength 198 nm is sufficient to ionise a metal atom. Calculate the ionisation energy in kJmol−1,(Planck constant h=6.6×10−34 Js, Avogadro number=6.02×1023
Answer» An electromagnetic radiation of wavelength 198 nm is sufficient to ionise a metal atom. Calculate the ionisation energy in $k J m o l^{- 1}, (P l a n c k c o n s t a n t h = 6.6 \times 10^{- 34} J s, A v o g a d r o n u m b e r = 6.02 \times 10^{23}$

Discussion

32.	The standard reaction gibbs energy for the electrochemical reaction. Cr2O2−7+2Fe+14H+→2Cr3++2Fe3++2H2O is −793 kJ mol−1. The standard cell potential is:
Answer» The standard reaction gibbs energy for the electrochemical reaction. $C r_{2} O_{7}^{2 -} + 2 F e + 14 H^{+} \to 2 C r^{3 +} + 2 F e^{3 +} + 2 H_{2} O$ is $- 793 k J m o l^{- 1}$ . The standard cell potential is:

32.

The standard reaction gibbs energy for the electrochemical reaction. Cr2O2−7+2Fe+14H+→2Cr3++2Fe3++2H2O is −793 kJ mol−1. The standard cell potential is:

Answer»

The standard reaction gibbs energy for the electrochemical reaction.

$C r_{2} O_{7}^{2 -} + 2 F e + 14 H^{+} \to 2 C r^{3 +} + 2 F e^{3 +} + 2 H_{2} O$ is $- 793 k J m o l^{- 1}$ . The standard cell potential is:

Discussion

33.	1) Na2O2Water−−−−→0 oCP+Q 2) Na2O2Water−−−−→25 oCP+R↑+S Calculate the sum of bond orders between same bonded atoms in Q and R compounds.
Answer» 1) $N a_{2} O_{2} W a t e r - --- \to 0^{o} C P + Q$ 2) $N a_{2} O_{2} W a t e r - --- \to 25^{o} C P + R ↑ + S$ Calculate the sum of bond orders between same bonded atoms in Q and R compounds.

Discussion

34.	Calculate the percentage of available chlorine in a sample of 3.546 g of bleaching powder which was dissolved in 100 mL of water, 25 mL of this solution, when treated with acetic acid and excess KI , required 20 mL of 0.125 N sodium thiosulphate solution.
Answer» Calculate the percentage of available chlorine in a sample of $3.546 g$ of bleaching powder which was dissolved in $100 m L$ of water, $25 m L$ of this solution, when treated with acetic acid and excess $K I$ , required $20 m L o f 0.125 N$ sodium thiosulphate solution.

Discussion

35.	In a normal spinel type structure, the oxide ions are arranged in ccp whereas 18 tetrahedral holes are occupied by Zn2+ ions and 50% of octahedral holes are occupied by Fe3+ ions. The formula of the compound is ?
Answer» In a normal spinel type structure, the oxide ions are arranged in ccp whereas $\frac{1}{8}$ tetrahedral holes are occupied by $Z n^{2 +}$ ions and 50% of octahedral holes are occupied by $F e^{3 +}$ ions. The formula of the compound is ?

Discussion

36.	How many atoms of nitrogen are present in one molecule of the product formed when formaldehyde reacts with ammonia?
Answer» How many atoms of nitrogen are present in one molecule of the product formed when formaldehyde reacts with ammonia?

Discussion

37.	Which of the following statement is correct about Langmuir's adsorption ?
Answer» Which of the following statement is correct about Langmuir's adsorption ?

Discussion

38.	A metal element ‘M’ of radius 50 nm is crystallized in FCC format cubical crystal such that the face of unit cells align with the face of cubical crystal. If the total number of metal atoms of ‘M’ at the face of the cubical crystal is 6×1030, then the area of one face of the cubical crystal is A×1016m2, the value of ‘A’ is:___
Answer» A metal element ‘M’ of radius 50 nm is crystallized in FCC format cubical crystal such that the face of unit cells align with the face of cubical crystal. If the total number of metal atoms of ‘M’ at the face of the cubical crystal is $6 \times 10^{30}$ , then the area of one face of the cubical crystal is $A \times 10^{16} m^{2}$ , the value of ‘A’ is:___

Discussion

39.	The correct ground state electronic configuration of chromium atom is:
Answer» The correct ground state electronic configuration of chromium atom is:

Discussion

40.	n- Octane in the presence of Cr2O3/Al2O3 at 873K changes to
Answer» n- Octane in the presence of Cr₂O₃/Al₂O₃ at 873K changes to

Discussion

41.	A gaseous reaction A(g) ↔ 2B(g) + C(g) is found to be of first order. If the reaction is started with pA = 90 mm Hg, the total pressure after 10 min is found to be 180 mm Hg. The rate constant of the reaction is
Answer» A gaseous reaction A(g) $\leftrightarrow$ 2B(g) + C(g) is found to be of first order. If the reaction is started with p_A = 90 mm Hg, the total pressure after 10 min is found to be 180 mm Hg. The rate constant of the reaction is

Discussion

42.	Excess of which of the followings in drinking water is responsible for disease known as ‘Blue Baby Syndrome’ or ‘Methemoglobinemia’?
Answer» Excess of which of the followings in drinking water is responsible for disease known as ‘Blue Baby Syndrome’ or ‘Methemoglobinemia’?

Discussion

43.	F - centers
Answer» F - centers

Discussion

44.	Kα wavelength emitted by an atom of atomic number Z = 11 is λ. Find the atomic number for an atom that emits Kα radiation with wavelength 4λ
Answer» $K_{α}$ wavelength emitted by an atom of atomic number Z = 11 is $λ$ . Find the atomic number for an atom that emits $K_{α}$ radiation with wavelength $4 λ$

Discussion

45.	Which one of the following oxides is neutral
Answer» Which one of the following oxides is neutral

45.

Which one of the following oxides is neutral

Answer»

Which one of the following oxides is neutral

Discussion

46.	Assume that the isotope U238 and U235 are found in the ratio 64 : 1 presently at a planet. At the time of the creation of the planet, they were present in an equal ratio.What is the age of the planet (in million years 106 ). The half-life period of U238 and U235 are 4.45×109 and 7.0×108 year respectively.
Answer» Assume that the isotope $U^{238}$ and $U^{235}$ are found in the ratio 64 : 1 presently at a planet. At the time of the creation of the planet, they were present in an equal ratio.What is the age of the planet (in million years $10^{6}$ ). The half-life period of $U^{238}$ and $U^{235}$ are $4.45 \times 10^{9}$ and $7.0 \times 10^{8}$ year respectively.

Discussion

47.	Functional isomer of CH3−CH2−OH is:
Answer» Functional isomer of $C H_{3} - C H_{2} - O H$ is:

Discussion

48.	When two liquids A and B are mixed then their boiling points becomes greater than both of them. What is the nature of this solution?
Answer» When two liquids A and B are mixed then their boiling points becomes greater than both of them. What is the nature of this solution?

Discussion

49.	The letter S has ___.
Answer» The letter S has ___.

Discussion

50.	The quantum numbers for an electron in the outermost orbital of an element are given as n=2,l=0,m=0,s=−12. The atom could be:
Answer» The quantum numbers for an electron in the outermost orbital of an element are given as $n = 2, l = 0, m = 0, s = - \frac{1}{2}$ . The atom could be:

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Out of benzene, m–dinitrobenzene and toluene which will undergo nitration most easily and why?

The species which by definition has ZERO standard Molar enthalpy of formation at 298 k is

Find the change in pH when 0.1 mol KI is added to 200 ml 0.3 M HI solution. (Assume volume remains constant)___

The correct explanation for the below reaction is

The hybridization involved in BCl3NH3 is:

The strongest reducing agent is (1) Be (2) Mg (3) Sr (4) Ba

A solution is prepared by dissolving 28g of sugar in 172g of water Calculate the mass percentage of solute.

Sec-butyl alcohol on heating with conc. H2SO4 at 443K gives

The work done in open vessel at 300 K, when 112 g iron reacts with dil HCl is:

In H2 - O2 fuel cell with 60% efficiency, 5 moles of H2O is formed.What will be the number of faradays of electricity produced?

OH− is more basic than SH− because

A chemical reaction A⇌B is said to be in equilibrium when -

What is oxidation number of hydrogen in NaH?

If v is the volume of one molecule of a gas under given conditions then va der Waals' constant b is

Chlorination of Toluene in the presence of sunlight gives :

Which of the following is an extensive property of system?

If one gram of a metal carbonate gave 0.56g of its oxide on heating then equivalent weight of metal will be

In terms of period and group where would you locate the element with Z =114?

Why melting point belongs to Physical property?

A 100 W power source emits green light having a wavelength of 5000 ∘A. How many photons are emitted per minute by the source?

The complex, [Ni(CN)4]2-, has:

The heats of combustion of carbon and carbon monoxide are -393.5 and -283.5 kJ mol−1, respectively. The heat of formation (in kJ) of carbon monoxide per mole is:

whenSO2 is passed in a solution of potassium iodate, the oxidation state of iodine changes from :

In an aqua sol,

The compound CH3 | CH3−C=CH−CH3on reaction with NaIO4 in the presence of KMnO4 gives

The process in which the strength of an unknown solution is calculated using a known standard solution is known as

The density of CaO is 3.35 gm/cm3. The oxide crystallises in one of the cubic systems with an edge of 4.80 Å. How many Ca++ ions and O-2 ions belong to each unit cell, and which type of cubic system is present?

The electron gain enthalpy (in kJ/mol) of Fluorine, Chlorine, Bromine and Iodine, respectively, are:

An electromagnetic radiation of wavelength 198 nm is sufficient to ionise a metal atom. Calculate the ionisation energy in kJmol−1,(Planck constant h=6.6×10−34 Js, Avogadro number=6.02×1023

The standard reaction gibbs energy for the electrochemical reaction. Cr2O2−7+2Fe+14H+→2Cr3++2Fe3++2H2O is −793 kJ mol−1. The standard cell potential is:

1) Na2O2Water−−−−→0 oCP+Q 2) Na2O2Water−−−−→25 oCP+R↑+S Calculate the sum of bond orders between same bonded atoms in Q and R compounds.

Calculate the percentage of available chlorine in a sample of 3.546 g of bleaching powder which was dissolved in 100 mL of water, 25 mL of this solution, when treated with acetic acid and excess KI , required 20 mL of 0.125 N sodium thiosulphate solution.

In a normal spinel type structure, the oxide ions are arranged in ccp whereas 18 tetrahedral holes are occupied by Zn2+ ions and 50% of octahedral holes are occupied by Fe3+ ions. The formula of the compound is ?

How many atoms of nitrogen are present in one molecule of the product formed when formaldehyde reacts with ammonia?

Which of the following statement is correct about Langmuir's adsorption ?

The correct ground state electronic configuration of chromium atom is:

n- Octane in the presence of Cr2O3/Al2O3 at 873K changes to

A gaseous reaction A(g) ↔ 2B(g) + C(g) is found to be of first order. If the reaction is started with pA = 90 mm Hg, the total pressure after 10 min is found to be 180 mm Hg. The rate constant of the reaction is

Excess of which of the followings in drinking water is responsible for disease known as ‘Blue Baby Syndrome’ or ‘Methemoglobinemia’?

F - centers

Kα wavelength emitted by an atom of atomic number Z = 11 is λ. Find the atomic number for an atom that emits Kα radiation with wavelength 4λ

Which one of the following oxides is neutral

Functional isomer of CH3−CH2−OH is:

When two liquids A and B are mixed then their boiling points becomes greater than both of them. What is the nature of this solution?

The letter S has ___.

The quantum numbers for an electron in the outermost orbital of an element are given as n=2,l=0,m=0,s=−12. The atom could be: