46295 + Interview Questions in Chemistry

1.	What is the maximum number of compounds with the molecular formula C4H11N, which give an alkali soluble precipitate with benzenesulphonyl chloride?
Answer» What is the maximum number of compounds with the molecular formula $C_{4} H_{11} N$ , which give an alkali soluble precipitate with benzenesulphonyl chloride?

Discussion

2.	Which among the following will give tertiary alcohol on acid hydration?
Answer» Which among the following will give tertiary alcohol on acid hydration?

Discussion

3.	Which one of the following is incorrect for ideal solution?
Answer» Which one of the following is incorrect for ideal solution?

Discussion

4.	Acid without -CooH group
Answer» Acid without -CooH group

Discussion

5.	Write the chemical reactions involved in the extraction of gold by cyanide process. Also give the role of zinc in the extraction.
Answer» Write the chemical reactions involved in the extraction of gold by cyanide process. Also give the role of zinc in the extraction.

Discussion

6.	What is dipole moment?
Answer» What is dipole moment?

Discussion

7.	A radioactive sample decays with an average life of 20 ms. A capacitor of 100 μF is charged to some potential and then the plates are connected through a resistance R . What should be the value of '20×R' (in kΩ), so that the ratio of the charge on the capacitor to the activity of the radioactive sample remains constant in time ?
Answer» A radioactive sample decays with an average life of $20 m s$ . A capacitor of $100 μ F$ is charged to some potential and then the plates are connected through a resistance $R$ . What should be the value of ' $20 \times R$ ' (in $k Ω$ ), so that the ratio of the charge on the capacitor to the activity of the radioactive sample remains constant in time ?

Discussion

8.	Two blocks of the same metal having same mass and at temperature T1 and T2 respectively, are brought in contact with each other and allowed to attain thermal equilibrium at constant pressure. The change in entropy, △S for this process is
Answer» Two blocks of the same metal having same mass and at temperature $T_{1}$ and $T_{2}$ respectively, are brought in contact with each other and allowed to attain thermal equilibrium at constant pressure. The change in entropy, $△ S$ for this process is

Discussion

9.	The correct order of increasing C−O bond length in CO,CO2−3,CO2 and CO+ is:
Answer» The correct order of increasing $C - O$ bond length in $C O, C O_{3}^{2 -}, C O_{2}$ and $C O^{+}$ is:

Discussion

10.	When copper pyrites is roasted in excess of air, a mixture of CuO + FeO is formed. FeO is present as impurity. This can be removed as slag during reduction of CuO. The flux added to form slag is
Answer» When copper pyrites is roasted in excess of air, a mixture of CuO + FeO is formed. FeO is present as impurity. This can be removed as slag during reduction of CuO. The flux added to form slag is

Discussion

11.	Chemical A is used for water softening to remove temporary hardness. A reacts with sodium carbonate to generate caustic soda. When CO2 is bubbled through a solution of A, it turns cloudy. What is the chemical formula of A
Answer» Chemical A is used for water softening to remove temporary hardness. A reacts with sodium carbonate to generate caustic soda. When $C O_{2}$ is bubbled through a solution of A, it turns cloudy. What is the chemical formula of A

Discussion

12.	Which one of the following has s - configuration
Answer» Which one of the following has s - configuration

Discussion

13.	Which of the following conformer represent the chair form of cyclohexane ?
Answer» Which of the following conformer represent the chair form of cyclohexane ?

Discussion

14.	Explain the term 'laminar flow'. Is the velocity of molecules same in all the layers in laminar flow? Explain your answer.
Answer» Explain the term 'laminar flow'. Is the velocity of molecules same in all the layers in laminar flow? Explain your answer.

Discussion

15.	Explain why alkyl groups act as electron donors when attached to a π system.
Answer» Explain why alkyl groups act as electron donors when attached to a π system.

Discussion

16.	The minimum amount of Ag2CO3(s) required to produce sufficient oxygen for the complete combustion of C2H2, which produces 11.2 L of CO2 at STP after combustion is: [Ag=108] Ag2CO3(s)→2Ag(s)+CO2(g)+12O2(g) C2H2+52O2→2CO2+H2O
Answer» The minimum amount of $A g_{2} C O_{3} (s)$ required to produce sufficient oxygen for the complete combustion of $C_{2} H_{2}$ , which produces $11.2 L$ of $C O_{2}$ at STP after combustion is: $[A g = 108]$ $A g_{2} C O_{3} (s) \to 2 A g (s) + C O_{2} (g) + \frac{1}{2} O_{2} (g)$ $C_{2} H_{2} + \frac{5}{2} O_{2} \to 2 C O_{2} + H_{2} O$

16.

The minimum amount of Ag2CO3(s) required to produce sufficient oxygen for the complete combustion of C2H2, which produces 11.2 L of CO2 at STP after combustion is: [Ag=108] Ag2CO3(s)→2Ag(s)+CO2(g)+12O2(g) C2H2+52O2→2CO2+H2O

Answer»

The minimum amount of $A g_{2} C O_{3} (s)$ required to produce sufficient oxygen for the complete combustion of $C_{2} H_{2}$ , which produces $11.2 L$ of $C O_{2}$ at STP after combustion is: $[A g = 108]$

$A g_{2} C O_{3} (s) \to 2 A g (s) + C O_{2} (g) + \frac{1}{2} O_{2} (g)$

$C_{2} H_{2} + \frac{5}{2} O_{2} \to 2 C O_{2} + H_{2} O$

Discussion

17.	Draw the structures of the following: (a) XeF4 (b) BrF5
Answer» Draw the structures of the following: (a) $X e F_{4}$ (b) $B r F_{5}$

Discussion

18.	If the enthalpy change for hydrogenation of ethylene is -132 kJ/mole and the enthalpy of formation of 1, 3-butadiene (g) and butane (g) are 115 kJ/mol and -140 kJ/mole respectively then calculate the magnitude of resonance energy of 1, 3-butadiene (in kJ)?
Answer» If the enthalpy change for hydrogenation of ethylene is -132 kJ/mole and the enthalpy of formation of 1, 3-butadiene (g) and butane (g) are 115 kJ/mol and -140 kJ/mole respectively then calculate the magnitude of resonance energy of 1, 3-butadiene (in kJ)?

Discussion

19.	Propene, CH3-CH=CH2 can be converted to 1-propanol by oxidation. Which set of reagents among the following is ideal to effect the conversion [CBSE PMT 1991]
Answer» Propene, CH₃-CH=CH₂ can be converted to 1-propanol by oxidation. Which set of reagents among the following is ideal to effect the conversion [CBSE PMT 1991]

19.

Propene, CH3-CH=CH2 can be converted to 1-propanol by oxidation. Which set of reagents among the following is ideal to effect the conversion [CBSE PMT 1991]

Answer»

Propene, CH₃-CH=CH₂ can be converted to 1-propanol by oxidation. Which set of reagents among the following is

ideal to effect the conversion [CBSE PMT 1991]

Discussion

20.	DDT is prepared by the reaction of chlorobenzene with:
Answer» DDT is prepared by the reaction of chlorobenzene with:

Discussion

21.	What is Hoffmann’s bromamide reaction ? Give its equation.
Answer» What is Hoffmann’s bromamide reaction ? Give its equation.

Discussion

22.	Which one of the following is detrimental to soil fertility?
Answer» Which one of the following is detrimental to soil fertility?

Discussion

23.	What is the electron separation energy (in eV) for Be3+ in the first excited state.
Answer» What is the electron separation energy (in $e V$ ) for $B e^{3 +}$ in the first excited state.

Discussion

24.	A gas with formula CnH2n+2 diffuses through the porous plug at a rate one sixth of the rate of diffusion of hydrogen gas under similar condition. The formula of gas is:
Answer» A gas with formula $C_{n} H_{2 n + 2}$ diffuses through the porous plug at a rate one sixth of the rate of diffusion of hydrogen gas under similar condition. The formula of gas is:

Discussion

25.	Maximum enolisation takes place in
Answer» Maximum enolisation takes place in

Discussion

26.	Hydrolysis of XeF6
Answer» Hydrolysis of XeF₆

Discussion

27.	Define conductivity and molar conductivity for the solution of an electrolyte. Discuss their variation with concentration ?
Answer» Define conductivity and molar conductivity for the solution of an electrolyte. Discuss their variation with concentration ?

Discussion

28.	The maximum velocity of an electron emitted by light of wavelength λ incident on the surface of a metal of work function ϕ is
Answer» The maximum velocity of an electron emitted by light of wavelength $λ$ incident on the surface of a metal of work function $ϕ$ is

Discussion

29.	Calculate the wavelength of a light wave whose time period is 3×10−10 s.
Answer» Calculate the wavelength of a light wave whose time period is $3 \times 10^{- 10} s$ .

Discussion

30.

he work function of metals is listed below. The number of metals which will show photoelectric effect when light of 300 nm wavelength falls on the metal is: Metal Li Na K Mg Cu Ag Fe Pt W ϕ eV 2.4 2.3 2.2 3.7 4.8 4.3 4.7 6.3 4.75

Answer» he work function of metals is listed below. The number of metals which will show photoelectric effect when light of 300 nm wavelength falls on the metal is:

Metal	Li	Na	K	Mg	Cu	Ag	Fe	Pt	W
$ϕ$ eV	2.4	2.3	2.2	3.7	4.8	4.3	4.7	6.3	4.75

Discussion

31.	Which of the following alkane ( having molecular weight = 86) on bromination gives only two monobromo derivatives (excluding stereoisomers) ?
Answer» Which of the following alkane ( having molecular weight = 86) on bromination gives only two monobromo derivatives (excluding stereoisomers) ?

Discussion

32.	Consider following conditions for quantum numbers: n+l=5 s=±12 Which of the following option(s) match(es) with the maximum number of electrons such that the above are satisfied in the ground state?
Answer» Consider following conditions for quantum numbers: $n + l = 5$ $s = \pm \frac{1}{2}$ Which of the following option(s) match(es) with the maximum number of electrons such that the above are satisfied in the ground state?

Discussion

33.	A cylinder filled with a movable piston contains liquid water in equilibrium with water vapour at 25°c . Which one of the following operations results in a decrease in equilibrium vapour pressure? 1. Moving piston downward a short distance 2. Removing a small amount of vapour 3. Removing a small amount of the liquid water 4. Dissolving salt in the water
Answer» A cylinder filled with a movable piston contains liquid water in equilibrium with water vapour at 25°c . Which one of the following operations results in a decrease in equilibrium vapour pressure? 1. Moving piston downward a short distance 2. Removing a small amount of vapour 3. Removing a small amount of the liquid water 4. Dissolving salt in the water

Discussion

34.	Which of the following is TRUE for Flourite type structure?
Answer» Which of the following is TRUE for Flourite type structure?

Discussion

35.	When pyrolusite is roasted in a basic medium KOH with air, a green coloured compound P is formed. Cl2 can convert P to a compound Q whose aqueous solution is purple in colour. If the oxidation state of Mn in P is X and the number of unpaired electrons in P is Y and that in Q is Z. Then find the value of XX−Y−Z
Answer» When pyrolusite is roasted in a basic medium $K O H$ with air, a green coloured compound $P$ is formed. $C l_{2}$ can convert $P$ to a compound $Q$ whose aqueous solution is purple in colour. If the oxidation state of $M n$ in $P$ is $X$ and the number of unpaired electrons in $P$ is $Y$ and that in $Q$ is $Z$ . Then find the value of $\frac{X}{X - Y - Z}$

Discussion

36.	Why zeolites are called good shape selective catalyst
Answer» Why zeolites are called good shape selective catalyst

Discussion

37.	1)an electron has principle quantum number 2. The number of sub shells and orbitals would be respectively ? 2)For azimuthal quantum number l=2 the maximum number of electrons will be?
Answer» 1)an electron has principle quantum number 2. The number of sub shells and orbitals would be respectively ? 2)For azimuthal quantum number l=2 the maximum number of electrons will be?

Discussion

38.	The freezing point of an aqueous solution of KCN containing 0.175molkg−1Kf was −0.7oCH2O=2kgmol−1K. On adding 0.095 mol of M(CN)2, the freezing point of the solution was –0.570C. Take the cryoscopic constant for water to be equal to 2 with the usual units. If the complex formation takes place according to the equation, M(CN)2+mKCN⇌Km[M(CN)m+2] what is the value of m (integral value) in the formula of the complex?
Answer» The freezing point of an aqueous solution of KCN containing 0.175molkg−1Kf was −0.7oCH2O=2kgmol−1K. On adding 0.095 mol of M(CN)2, the freezing point of the solution was –0.570C. Take the cryoscopic constant for water to be equal to 2 with the usual units. If the complex formation takes place according to the equation, M(CN)2+mKCN⇌Km[M(CN)m+2] what is the value of m (integral value) in the formula of the complex?

Discussion

39.	Difference between valency , covalency ,and oxidation state
Answer» Difference between valency , covalency ,and oxidation state

Discussion

40.	V-I graph of which material shows the straight line
Answer» V-I graph of which material shows the straight line

Discussion

41.	The root mean square speed of the molecules of an enclosed gas is v .What will be the root mean Square speed if the pressure is doubled, the temperature remaining the same?
Answer» The root mean square speed of the molecules of an enclosed gas is $v$ .What will be the root mean Square speed if the pressure is doubled, the temperature remaining the same?

Discussion

42.	Which of the following is/are correct about SO2?
Answer» Which of the following is/are correct about $S O_{2}$ ?

Discussion

43.	The bond dissociation energy needed to form benzyl radical from toulene is ................ than the formation of the methyl radical from methane A. Less B. More C. Equal D. None of the above ---------------------------------------------------------------------- What should be the answer of this question according to you and why?
Answer» The bond dissociation energy needed to form benzyl radical from toulene is ................ than the formation of the methyl radical from methane A. Less B. More C. Equal D. None of the above ---------------------------------------------------------------------- What should be the answer of this question according to you and why?

Discussion

44.	Find the number of molecules of an ideal gas in a volume of 1000 cm3 at STP.
Answer» Find the number of molecules of an ideal gas in a volume of 1000 $c m^{3}$ at STP.

Discussion

45.	What is the priority series of the functional groups exhibiting +I effect ?
Answer» What is the priority series of the functional groups exhibiting +I effect ?

Discussion

46.	The density of a mixture of CO and CO2 at 303 K and 73 cm Hg is 1.5 g L−1. What is the mole percent of CO and CO2 respectively in the mixture?
Answer» The density of a mixture of $C O$ and $C O_{2}$ at $303 K$ and $73 cm$ $H g$ is $1.5 {g L}^{- 1}$ . What is the mole percent of $C O$ and $C O_{2}$ respectively in the mixture?

Discussion

47.	Among the group 17 members, radioactivity is present in:
Answer» Among the group 17 members, radioactivity is present in:

Discussion

48.	The compressibility factor for a real gas at high pressure is
Answer» The compressibility factor for a real gas at high pressure is

Discussion

49.	Select the correct order of molecular velocities.
Answer» Select the correct order of molecular velocities.

Discussion

50.	Is water a stronger base than chlorine ion?
Answer» Is water a stronger base than chlorine ion?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

What is the maximum number of compounds with the molecular formula C4H11N, which give an alkali soluble precipitate with benzenesulphonyl chloride?

Which among the following will give tertiary alcohol on acid hydration?

Which one of the following is incorrect for ideal solution?

Acid without -CooH group

Write the chemical reactions involved in the extraction of gold by cyanide process. Also give the role of zinc in the extraction.

What is dipole moment?

Two blocks of the same metal having same mass and at temperature T1 and T2 respectively, are brought in contact with each other and allowed to attain thermal equilibrium at constant pressure. The change in entropy, △S for this process is

The correct order of increasing C−O bond length in CO,CO2−3,CO2 and CO+ is:

When copper pyrites is roasted in excess of air, a mixture of CuO + FeO is formed. FeO is present as impurity. This can be removed as slag during reduction of CuO. The flux added to form slag is

Chemical A is used for water softening to remove temporary hardness. A reacts with sodium carbonate to generate caustic soda. When CO2 is bubbled through a solution of A, it turns cloudy. What is the chemical formula of A

Which one of the following has s - configuration

Which of the following conformer represent the chair form of cyclohexane ?

Explain the term 'laminar flow'. Is the velocity of molecules same in all the layers in laminar flow? Explain your answer.

Explain why alkyl groups act as electron donors when attached to a π system.

The minimum amount of Ag2CO3(s) required to produce sufficient oxygen for the complete combustion of C2H2, which produces 11.2 L of CO2 at STP after combustion is: [Ag=108] Ag2CO3(s)→2Ag(s)+CO2(g)+12O2(g) C2H2+52O2→2CO2+H2O

Draw the structures of the following: (a) XeF4 (b) BrF5

If the enthalpy change for hydrogenation of ethylene is -132 kJ/mole and the enthalpy of formation of 1, 3-butadiene (g) and butane (g) are 115 kJ/mol and -140 kJ/mole respectively then calculate the magnitude of resonance energy of 1, 3-butadiene (in kJ)?

Propene, CH3-CH=CH2 can be converted to 1-propanol by oxidation. Which set of reagents among the following is ideal to effect the conversion [CBSE PMT 1991]

DDT is prepared by the reaction of chlorobenzene with:

What is Hoffmann’s bromamide reaction ? Give its equation.

Which one of the following is detrimental to soil fertility?

What is the electron separation energy (in eV) for Be3+ in the first excited state.

A gas with formula CnH2n+2 diffuses through the porous plug at a rate one sixth of the rate of diffusion of hydrogen gas under similar condition. The formula of gas is:

Maximum enolisation takes place in

Hydrolysis of XeF6

Define conductivity and molar conductivity for the solution of an electrolyte. Discuss their variation with concentration ?

The maximum velocity of an electron emitted by light of wavelength λ incident on the surface of a metal of work function ϕ is

Calculate the wavelength of a light wave whose time period is 3×10−10 s.

he work function of metals is listed below. The number of metals which will show photoelectric effect when light of 300 nm wavelength falls on the metal is: Metal Li Na K Mg Cu Ag Fe Pt W ϕ eV 2.4 2.3 2.2 3.7 4.8 4.3 4.7 6.3 4.75

Which of the following alkane ( having molecular weight = 86) on bromination gives only two monobromo derivatives (excluding stereoisomers) ?

Consider following conditions for quantum numbers: n+l=5 s=±12 Which of the following option(s) match(es) with the maximum number of electrons such that the above are satisfied in the ground state?

Which of the following is TRUE for Flourite type structure?

Why zeolites are called good shape selective catalyst

1)an electron has principle quantum number 2. The number of sub shells and orbitals would be respectively ? 2)For azimuthal quantum number l=2 the maximum number of electrons will be?

Difference between valency , covalency ,and oxidation state

V-I graph of which material shows the straight line

The root mean square speed of the molecules of an enclosed gas is v .What will be the root mean Square speed if the pressure is doubled, the temperature remaining the same?

Which of the following is/are correct about SO2?

Find the number of molecules of an ideal gas in a volume of 1000 cm3 at STP.

What is the priority series of the functional groups exhibiting +I effect ?

The density of a mixture of CO and CO2 at 303 K and 73 cm Hg is 1.5 g L−1. What is the mole percent of CO and CO2 respectively in the mixture?

Among the group 17 members, radioactivity is present in:

The compressibility factor for a real gas at high pressure is

Select the correct order of molecular velocities.

Is water a stronger base than chlorine ion?