2600 + Interview Questions in Chemistry Page 34 InterviewSolution

1651.	Find the total number of electrons present in 20 millimoles of K2SO4.
Answer» Find the total number of electrons present in 20 millimoles of $K_{2} S O_{4} .$

Discussion

1652.	The decreasing order of rate of reaction with HBr for the following compounds is :
Answer» The decreasing order of rate of reaction with $H B r$ for the following compounds is :

Discussion

1653.	Work done in reversible adiabatic process in given by:
Answer» Work done in reversible adiabatic process in given by:

Discussion

1654.	Cortisone is a molecular substance that has 21 atoms of carbon per molecule. The mass percentage of carbon in cortisone is 69.98%. Its molar mass is:
Answer» Cortisone is a molecular substance that has $21$ atoms of carbon per molecule. The mass percentage of carbon in cortisone is 69.98%. Its molar mass is:

Discussion

1655.	Ortho-nitrophenol is steam volatile whereas para-nitrophenol is not. This is due to [CBSE PMT 1989]
Answer» Ortho-nitrophenol is steam volatile whereas para-nitrophenol is not. This is due to [CBSE PMT 1989]

Discussion

1656.	Which of the following ammonium salts give(s) nitrogen on heating?
Answer» Which of the following ammonium salts give(s) nitrogen on heating?

Discussion

1657.	In which of the following processes is energy liberated?
Answer» In which of the following processes is energy liberated?

Discussion

1658.	Which of the following statement is not correct about the periodic classification of elements?
Answer» Which of the following statement is not correct about the periodic classification of elements?

Discussion

1659.	Copper crystallizes in a face-centered cubic lattice with a unit cell length of 361 pm. What is the radius of copper atoms in pm?
Answer» Copper crystallizes in a face-centered cubic lattice with a unit cell length of $361 pm$ . What is the radius of copper atoms in $pm$ ?

Discussion

1660.	Pure (-)-2-chlorobutane gives how many different dichlorobutanes including stereoisomers?
Answer» Pure (-)-2-chlorobutane gives how many different dichlorobutanes including stereoisomers?

Discussion

1661.	Consider the bcc unit cells of the solids 1 and 2 with the position of atoms as shown below. The radius of atom B is twice that of atom A. The unit cell edge length is 50% more in solid 2 than in 1. What is the approximate packing efficiency in solid 2?
Answer» Consider the bcc unit cells of the solids $1$ and $2$ with the position of atoms as shown below. The radius of atom $B$ is twice that of atom $A$ . The unit cell edge length is $50 %$ more in solid $2$ than in $1$ . What is the approximate packing efficiency in solid $2$ ?

Discussion

1662.	If aufbau rule in not followed, the 19th electron of Sc(Z=21) will have:
Answer» If aufbau rule in not followed, the $19^{t h}$ electron of Sc(Z=21) will have:

Discussion

1663.	Molecular formula of napthaquinone
Answer» Molecular formula of napthaquinone

Discussion

1664.	The equation of state of a gas is P(V−nb)=nRT, where b and R are constants. If the pressure and the temperature are such that Vm=10b, what is the value of compressibility factor?
Answer» The equation of state of a gas is $P (V - n b) = n R T$ , where $b$ and $R$ are constants. If the pressure and the temperature are such that $V_{m} = 10 b,$ what is the value of compressibility factor?

Discussion

1665.	There is an insect moving on horizontal floor, on which it can only move forward- backward or turn left-right.What is the degrees of freedom of that insect ?
Answer» There is an insect moving on horizontal floor, on which it can only move forward- backward or turn left-right. What is the degrees of freedom of that insect ?

Discussion

1666.	The van der Waal gas constant 'a' is given by which of the following relations?
Answer» The van der Waal gas constant 'a' is given by which of the following relations?

Discussion

1667.	Which of the following statements are true about an electrolytic cell?
Answer» Which of the following statements are true about an electrolytic cell?

Discussion

1668.	Choose the correct order of electron density for the following compounds :
Answer» Choose the correct order of electron density for the following compounds :

Discussion

1669.	If z axis is the molecular axis then π orbitals are formed via the overlap of-
Answer» If $z$ axis is the molecular axis then $π$ orbitals are formed via the overlap of-

Discussion

1670.	The \|HFH––––––– bond angle in the following structure
Answer» The $\| H F H - ----- -$ bond angle in the following structure

Discussion

1671.	Oxidation of a compound ‘X’ gives a product which reacts with phenyl hydrazine but does not give a sliver mirror test. The structure of ‘X’ is
Answer» Oxidation of a compound ‘X’ gives a product which reacts with phenyl hydrazine but does not give a sliver mirror test. The structure of ‘X’ is

Discussion

1672.	The total number of distinct naturally occurring amino acids obtained by complete acidic hydrolysis of the peptide shown below is___
Answer» The total number of distinct naturally occurring amino acids obtained by complete acidic hydrolysis of the peptide shown below is___

Discussion

1673.	The hybridisation of carbanion is:
Answer» The hybridisation of carbanion is:

Discussion

1674.	A sample of air contains nitrogen, oxygen and saturated with water vapour under a total pressure of 640 mm. If the vapour pressure of water at that temperature is 40 mm and the molecular ratio of N2:O2 is 3 : 1. Find the partial pressure of nitrogen in the sample.
Answer» A sample of air contains nitrogen, oxygen and saturated with water vapour under a total pressure of 640 mm. If the vapour pressure of water at that temperature is 40 mm and the molecular ratio of $N_{2} : O_{2}$ is 3 : 1. Find the partial pressure of nitrogen in the sample.

Discussion

1675.	A bulb emits light of wavelength 4500 ˚A. The bulb is rated as 150 W and 8% of the energy is emitted as light. How many photons are emitted by the bulb per second?
Answer» A bulb emits light of wavelength 4500 $˚ A$ . The bulb is rated as 150 W and 8% of the energy is emitted as light. How many photons are emitted by the bulb per second?

Discussion

1676.	In Nessler’s reagent, the active ion is:
Answer» In Nessler’s reagent, the active ion is:

Discussion

1677.	Three black bodies are such that the maximum intensity of their wavelength are in the ratio λm1:λm2:λm3=1:(21)0.5:(3)0.5.Which of these is true for their temperature?
Answer» Three black bodies are such that the maximum intensity of their wavelength are in the ratio $λ_{m_{1}} : λ_{m_{2}} : λ_{m_{3}} = 1 : (21)^{0.5} : (3)^{0.5}$ . Which of these is true for their temperature?

Discussion

1678.	Which among the following can be the starting material for the synthesis of benzylamine by Hoffmann-bromamide degradation reaction?
Answer» Which among the following can be the starting material for the synthesis of benzylamine by Hoffmann-bromamide degradation reaction?

Discussion

1679.	Which of the following oxides is amphoteric?
Answer» Which of the following oxides is amphoteric?

Discussion

1680.	H2O2+2KI40% yield⟶I2+2KOHH2O2+2KMnO4+3H2SO450% yield⟶K2SO4+2MnSO4+3O2+4H2O150 mL of a H2O2 sample was divided into two parts. The first part was treated with KI and the formed KOH required 200mL of M2H2SO4 for complete neutralisation. The other part was treated with KMnO4 yielding 6.72 L of O2 at 1 atm and 273 K. Using the % yields indicated, find the volume strength of the H2O2 sample used.
Answer» $H_{2} O_{2} + 2 K I 40 % y i e l d ⟶ I_{2} + 2 K O H H_{2} O_{2} + 2 K M n O_{4} + 3 H_{2} S O_{4} 50 % y i e l d ⟶ K_{2} S O_{4} + 2 M n S O_{4} + 3 O_{2} + 4 H_{2} O$ $150 mL$ of a $H_{2} O_{2}$ sample was divided into two parts. The first part was treated with $K I$ and the formed $K O H$ required $200 mL$ of $\frac{M}{2} H_{2} S O_{4}$ for complete neutralisation. The other part was treated with $K M n O_{4}$ yielding $6.72 L$ of $O_{2}$ at $1 atm$ and $273 K$ . Using the $%$ yields indicated, find the volume strength of the $H_{2} O_{2}$ sample used.

Discussion

1681.	Lead is formed from its ore by the following reactions: 2PbS(s)+3O2(g)→2PbO(s)+2SO2(g) (Yield = 40 %)PbO(s)+C(s)→Pb(s)+CO(g) (Yield = 80 %)If 550 kg of PbS was initially taken, find the amount of Pb in kg formed.(Molar mass of Pb=207 g/mol)
Answer» Lead is formed from its ore by the following reactions: $2 P b S (s) + 3 O_{2} (g) \to 2 P b O (s) + 2 S O_{2} (g) (Yield = 40 %)$ $P b O (s) + C (s) \to P b (s) + C O (g) (Yield = 80 %)$ If $550 kg$ of $P b S$ was initially taken, find the amount of $P b$ in kg formed. (Molar mass of $P b = 207 g/mol$ )

Discussion

1682.	In which molecule is van der Waals force most likely to be important in determining the melting point and the boiling point?
Answer» In which molecule is van der Waals force most likely to be important in determining the melting point and the boiling point?

Discussion

1683.	Among the following, the incorrect order is:
Answer» Among the following, the incorrect order is:

Discussion

1684.	The heat of combustion of sucrose (C12H22O11) is −5.65×103 kJ. If complete combustion of 1.0 kg sucrose is done, heat evloved will be:
Answer» The heat of combustion of sucrose $(C_{12} H_{22} O_{11})$ is $- 5.65 \times 10^{3} k J$ . If complete combustion of $1.0 k g$ sucrose is done, heat evloved will be:

Discussion

1685.	Paragraph :In metal excess defect, anions all missed from their lattice sites and they are occupied by electrons to maintain electrical neutrality. These sites occupied by electrons are called F-centers. Question: The colour of NaCl changes when heated in sodium vapour due to
Answer» Paragraph :In metal excess defect, anions all missed from their lattice sites and they are occupied by electrons to maintain electrical neutrality. These sites occupied by electrons are called F-centers. Question: The colour of NaCl changes when heated in sodium vapour due to

1685.

Paragraph :In metal excess defect, anions all missed from their lattice sites and they are occupied by electrons to maintain electrical neutrality. These sites occupied by electrons are called F-centers. Question: The colour of NaCl changes when heated in sodium vapour due to

Answer»

Paragraph :In metal excess defect, anions all missed from their lattice sites and they are occupied by electrons to maintain electrical neutrality. These sites occupied by electrons are called F-centers.

Question: The colour of NaCl changes when heated in sodium vapour due to

Discussion

1686.	The number of water molecules present in 2 litres of water is:
Answer» The number of water molecules present in 2 litres of water is:

Discussion

1687.	How is the titration curve of mixture of weak and strong acids against a strong base looks like?
Answer» How is the titration curve of mixture of weak and strong acids against a strong base looks like?

Discussion

1688.	The de Broglie equation describes the relationship of wavelength associated with the wave-like nature of an electron and its
Answer» The de Broglie equation describes the relationship of wavelength associated with the wave-like nature of an electron and its

Discussion

1689.	One mole of an ideal gas at 300 K in thermal contact with surroundings expands isothermally from 1.0L to 2.0L against a constant pressure of 3.0 atm. In this process, the change in entropy of surroundings (ΔS) in T−1 is (1 L atm = 101.3J)
Answer» One mole of an ideal gas at 300 K in thermal contact with surroundings expands isothermally from 1.0L to 2.0L against a constant pressure of 3.0 atm. In this process, the change in entropy of surroundings $(Δ S) i n T^{- 1}$ is (1 L atm = 101.3J)

Discussion

1690.	Which of the following exhibits H-bonding?
Answer» Which of the following exhibits H-bonding?

Discussion

1691.	A Solution of palmitic acid in benzene contains 4.24 g of acid per litre. When this solution is dropped on a surface, benzene evaporates and palmitic acid forms a unimolecular film on the surface. If we wish to cover an area of 500 cm2 with a unimolecular film, what volume of solution (in litres) should be used? The area covered by one palmitic acid molecule may be taken as 0.21 nm2.Molecular weight of palmitic acid = 256 gmol−1.
Answer» A Solution of palmitic acid in benzene contains $4.24 g$ of acid per litre. When this solution is dropped on a surface, benzene evaporates and palmitic acid forms a unimolecular film on the surface. If we wish to cover an area of $500 {cm}^{2}$ with a unimolecular film, what volume of solution (in litres) should be used? The area covered by one palmitic acid molecule may be taken as $0.21 {nm}^{2}$ . Molecular weight of palmitic acid = 256 $g m o l^{- 1}$ .

Discussion

1692.	Select the compound with incorrect principal group:-
Answer» Select the compound with incorrect principal group:-

Discussion

1693.	In the following reaction A and B are
Answer» In the following reaction A and B are

1693.

In the following reaction A and B are

Answer»

In the following reaction A and B are

Discussion

1694.	Keto-enol tautomerism is observed in
Answer» Keto-enol tautomerism is observed in

Discussion

1695.	CH2=CH−NO2+HBr→P; The major product ′P′ is:
Answer» $C H_{2} = C H - N O_{2} + H B r \to P$ ; The major product $^{'} P^{'}$ is:

Discussion

1696.	Which of the following compounds will not give effervescence (CO2) with NaHCO3?
Answer» Which of the following compounds will not give effervescence $(C O_{2})$ with $N a H C O_{3}$ ?

Discussion

1697.	What is the heat of formation of CS2, if the heats of combustion of C,S and CS2 are x, y and z kJ mol−1 ?
Answer» What is the heat of formation of $C S_{2}$ , if the heats of combustion of $C, S$ and $C S_{2}$ are x, y and z kJ mol $^{- 1}$ ?

Discussion

1698.	The value of ΔH−ΔU for the following reaction at 37o C will be:2NH3(g)→N2(g)+3H2(g)
Answer» The value of $Δ H - Δ U$ for the following reaction at $37^{o}$ C will be: $2 N H_{3} (g) \to N_{2} (g) + 3 H_{2} (g)$

Discussion

1699.	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

1700.	Which of the following reduction reactions are actually employed in the commercial extraction of metals?
Answer» Which of the following reduction reactions are actually employed in the commercial extraction of metals?

Discussion

Explore topic-wise InterviewSolutions in .

Find the total number of electrons present in 20 millimoles of K2SO4.

The decreasing order of rate of reaction with HBr for the following compounds is :

Work done in reversible adiabatic process in given by:

Cortisone is a molecular substance that has 21 atoms of carbon per molecule. The mass percentage of carbon in cortisone is 69.98%. Its molar mass is:

Ortho-nitrophenol is steam volatile whereas para-nitrophenol is not. This is due to [CBSE PMT 1989]

Which of the following ammonium salts give(s) nitrogen on heating?

In which of the following processes is energy liberated?

Which of the following statement is not correct about the periodic classification of elements?

Copper crystallizes in a face-centered cubic lattice with a unit cell length of 361 pm. What is the radius of copper atoms in pm?

Pure (-)-2-chlorobutane gives how many different dichlorobutanes including stereoisomers?

Consider the bcc unit cells of the solids 1 and 2 with the position of atoms as shown below. The radius of atom B is twice that of atom A. The unit cell edge length is 50% more in solid 2 than in 1. What is the approximate packing efficiency in solid 2?

If aufbau rule in not followed, the 19th electron of Sc(Z=21) will have:

Molecular formula of napthaquinone

The equation of state of a gas is P(V−nb)=nRT, where b and R are constants. If the pressure and the temperature are such that Vm=10b, what is the value of compressibility factor?

There is an insect moving on horizontal floor, on which it can only move forward- backward or turn left-right.What is the degrees of freedom of that insect ?

The van der Waal gas constant 'a' is given by which of the following relations?

Which of the following statements are true about an electrolytic cell?

Choose the correct order of electron density for the following compounds :

If z axis is the molecular axis then π orbitals are formed via the overlap of-

The |HFH––––––– bond angle in the following structure

Oxidation of a compound ‘X’ gives a product which reacts with phenyl hydrazine but does not give a sliver mirror test. The structure of ‘X’ is

The total number of distinct naturally occurring amino acids obtained by complete acidic hydrolysis of the peptide shown below is___

The hybridisation of carbanion is:

A sample of air contains nitrogen, oxygen and saturated with water vapour under a total pressure of 640 mm. If the vapour pressure of water at that temperature is 40 mm and the molecular ratio of N2:O2 is 3 : 1. Find the partial pressure of nitrogen in the sample.

A bulb emits light of wavelength 4500 ˚A. The bulb is rated as 150 W and 8% of the energy is emitted as light. How many photons are emitted by the bulb per second?

In Nessler’s reagent, the active ion is:

Three black bodies are such that the maximum intensity of their wavelength are in the ratio λm1:λm2:λm3=1:(21)0.5:(3)0.5.Which of these is true for their temperature?

Which among the following can be the starting material for the synthesis of benzylamine by Hoffmann-bromamide degradation reaction?

Which of the following oxides is amphoteric?

Lead is formed from its ore by the following reactions: 2PbS(s)+3O2(g)→2PbO(s)+2SO2(g) (Yield = 40 %)PbO(s)+C(s)→Pb(s)+CO(g) (Yield = 80 %)If 550 kg of PbS was initially taken, find the amount of Pb in kg formed.(Molar mass of Pb=207 g/mol)

In which molecule is van der Waals force most likely to be important in determining the melting point and the boiling point?

Among the following, the incorrect order is:

The heat of combustion of sucrose (C12H22O11) is −5.65×103 kJ. If complete combustion of 1.0 kg sucrose is done, heat evloved will be:

Paragraph :In metal excess defect, anions all missed from their lattice sites and they are occupied by electrons to maintain electrical neutrality. These sites occupied by electrons are called F-centers. Question: The colour of NaCl changes when heated in sodium vapour due to

The number of water molecules present in 2 litres of water is:

How is the titration curve of mixture of weak and strong acids against a strong base looks like?

The de Broglie equation describes the relationship of wavelength associated with the wave-like nature of an electron and its

One mole of an ideal gas at 300 K in thermal contact with surroundings expands isothermally from 1.0L to 2.0L against a constant pressure of 3.0 atm. In this process, the change in entropy of surroundings (ΔS) in T−1 is (1 L atm = 101.3J)

Which of the following exhibits H-bonding?

Select the compound with incorrect principal group:-

In the following reaction A and B are

Keto-enol tautomerism is observed in

CH2=CH−NO2+HBr→P; The major product ′P′ is:

Which of the following compounds will not give effervescence (CO2) with NaHCO3?

What is the heat of formation of CS2, if the heats of combustion of C,S and CS2 are x, y and z kJ mol−1 ?

The value of ΔH−ΔU for the following reaction at 37o C will be:2NH3(g)→N2(g)+3H2(g)

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 of the following reduction reactions are actually employed in the commercial extraction of metals?