1708 + Interview Questions in Chemistry Page 18 InterviewSolution

851.	The vapour pressure of liquid water is 29.8 torr at 25∘ C. By what factor does the molar volume of water increases as it vaporizes to form an ideal gas under these conditions ? The density of liquid water is 1 g cm−3 at 298 K.
Answer» The vapour pressure of liquid water is 29.8 torr at $25^{\circ} C$ . By what factor does the molar volume of water increases as it vaporizes to form an ideal gas under these conditions ? The density of liquid water is $1 {g cm}^{- 3}$ at $298 K$ .

Discussion

852.	For this reaction at 300 K A(g)+B(g)→C(g) △U=−3.0 kcal;△S=−10.0 cal/K value of △G is :
Answer» For this reaction at 300 K $A (g) + B (g) \to C (g) △ U = - 3.0 k c a l; △ S = - 10.0 c a l / K$ value of $△ G$ is :

Discussion

853.	The pH of 0.05 M aqueous solution of diethyl amine is 12.0. Calculate Kb.
Answer» The pH of $0.05 M$ aqueous solution of diethyl amine is 12.0. Calculate $K_{b}$ .

Discussion

854.	In the following reactions, the product S is
Answer» In the following reactions, the product S is

Discussion

855.	Maximum pKb value is for
Answer» Maximum pK_bvalue is for

Discussion

856.	An open vessel at 27oC is heated until 38th of the air in it has been expelled. Assuming that the volume remains constant, calculate the temperature to which the vessel was heated.
Answer» An open vessel at $27^{o} C$ is heated until ${\frac{3}{8}}^{t h}$ of the air in it has been expelled. Assuming that the volume remains constant, calculate the temperature to which the vessel was heated.

Discussion

857.	When dil. H2SO4 is electrolysed by using platinum electrodes the gas evolved at cathode is
Answer» When dil. $H_{2} S O_{4}$ is electrolysed by using platinum electrodes the gas evolved at cathode is

Discussion

858.	The correct order of +M effect of ′N′ containing functional group on benzene ring, amongst the given compounds is(I) (II)(III) (IV)
Answer» The correct order of $+ M$ effect of $^{'} N^{'}$ containing functional group on benzene ring, amongst the given compounds is (I) (II) (III) (IV)

Discussion

859.	The dissociation constant of 0.05 M CH3COOH is given as 1.8×10−5. Calculate the percentage dissociation of CH3COOH in 0.2 M HCl solution.
Answer» The dissociation constant of $0.05 M C H_{3} C O O H$ is given as $1.8 \times 10^{- 5}$ . Calculate the percentage dissociation of $C H_{3} C O O H$ in $0.2 M H C l$ solution.

Discussion

860.	Which of the following is not a linear polyatomic molecule?
Answer» Which of the following is not a linear polyatomic molecule?

Discussion

861.	Nature of aqueous solutions of two different amino acids 'X' and 'Y' are acidic and basic. Here 'X' and 'Y' are
Answer» Nature of aqueous solutions of two different amino acids 'X' and 'Y' are acidic and basic. Here 'X' and 'Y' are

Discussion

862.	First order X-ray reflection (λ = 154 pm) is maximum from a set of (2, 0, 0) planes of a B.C.C lattice was observed at 16∘, 6’. Then, the edge length of unit cell is
Answer» First order X-ray reflection ( $λ$ = 154 pm) is maximum from a set of (2, 0, 0) planes of a B.C.C lattice was observed at $16^{\circ}$ , 6’. Then, the edge length of unit cell is

Discussion

863.	The elemental analysis of an organic compound containing C, H and O gives the percentage compositions of C and H to be 39.9% and 6.7% respectively. If the molecular weight of the compound is 180 u, then the number of carbon atoms present in the molecule is:
Answer» The elemental analysis of an organic compound containing $C, H and O$ gives the percentage compositions of $C$ and $H$ to be $39.9 %$ and $6.7 %$ respectively. If the molecular weight of the compound is $180 u$ , then the number of carbon atoms present in the molecule is:

Discussion

864.	Which has maximum coordinating points?
Answer» Which has maximum coordinating points?

Discussion

865.	List-I contains chiral molecules and List-II contains number of stereoisomers.Which of the following has the correct combination considering List-I and List-II?
Answer» List-I contains chiral molecules and List-II contains number of stereoisomers. Which of the following has the correct combination considering List-I and List-II?

Discussion

866.	A substance which participates readily in both acid-base and oxidation-reduction reactions is:
Answer» A substance which participates readily in both acid-base and oxidation-reduction reactions is:

Discussion

867.	Among the following compounds, the one which can be dehydrated very easily is?
Answer» Among the following compounds, the one which can be dehydrated very easily is?

Discussion

868.	The number of moles of oxalate ions oxidized by one mole of MnO−4 ion in acidic medium.
Answer» The number of moles of oxalate ions oxidized by one mole of $M n O_{4}^{-}$ ion in acidic medium.

Discussion

869.	What volume of water must be added to 50 mL of a 0.5 M H2SO4 to give a solution having a concentration of 0.1 M H2SO4?
Answer» What volume of water must be added to $50 mL$ of a $0.5 M H_{2} S O_{4}$ to give a solution having a concentration of $0.1 M H_{2} S O_{4} ?$

Discussion

870.	The impossible overlap among the following is:
Answer» The impossible overlap among the following is:

Discussion

871.	The major product of this reaction is:
Answer» The major product of this reaction is:

Discussion

872.	Choose the correct increasing order of reactivity of alkyl halides with zinc and dilute HCl.
Answer» Choose the correct increasing order of reactivity of alkyl halides with zinc and dilute $H C l$ .

Discussion

873.	The density of a 0.438 M solution of potassium chromate at 298 K is 1.063 g cm−3. Calculate the vapour pressure of water above this solution. Given : P0 (water) = 23.79 mm Hg.
Answer» The density of a 0.438 M solution of potassium chromate at 298 K is $1.063 g c m^{- 3}$ . Calculate the vapour pressure of water above this solution. Given : $P^{0}$ (water) = 23.79 mm Hg.

Discussion

874.	The boiling point of 0.2 mol kg−1solution of X in water is greater than equimolal solution of Y in water. Which one of the following statements is true in this case?
Answer» The boiling point of 0.2 mol $k g^{- 1}$ solution of X in water is greater than equimolal solution of Y in water. Which one of the following statements is true in this case?

Discussion

875.	In an alkaline solution, the following equilibria exist. S2−+S→S2−2equilibrium constant K1 S2−2+S→S2−3 equilibrium constant K2K1 and K2 have the values 12 and 11, respectively.S2−3→S2−+2S. What is equilibrium constant for the reaction?
Answer» In an alkaline solution, the following equilibria exist. $S^{2 -} + S \to S_{2}^{2 -}$ equilibrium constant $K_{1}$ $S_{2}^{2 -} + S \to S_{3}^{2 -}$ equilibrium constant $K_{2}$ $K_{1}$ and $K_{2}$ have the values 12 and 11, respectively. $S_{3}^{2 -} \to S^{2 -} + 2 S$ . What is equilibrium constant for the reaction?

Discussion

876.	At 25∘C, the ionization constants of CH3COOH and NH3 are almost equal. The pH of a solution of 0.01 M CH3COOH is 4.0 at 25∘C. The pOH of 0.01 M NH4OH at the same temperature will be :
Answer» At $25^{\circ} C$ , the ionization constants of $C H_{3} C O O H$ and $N H_{3}$ are almost equal. The pH of a solution of $0.01 M C H_{3} C O O H$ is 4.0 at $25^{\circ} C$ . The pOH of 0.01 $M N H_{4} O H$ at the same temperature will be :

Discussion

877.	Which of the following compounds is metallic and ferromagnetic?
Answer» Which of the following compounds is metallic and ferromagnetic?

Discussion

878.	A 5 mL solution of 5 N H2SO4 is diluted to 250 mL. What will be the normality of H2SO4 in the diluted solution ?
Answer» A $5 m L$ solution of $5 N H_{2} S O_{4}$ is diluted to $250 m L$ . What will be the normality of $H_{2} S O_{4}$ in the diluted solution ?

Discussion

879.	Students Ram, Shyam, and Raj measured the radius of an element A. The values of their practical were not the same(Ram = 110 nm, Shyam = 190 nm and Raj = 108 nm).Their teacher explained that their measurement was correct by saying that the recorded values are
Answer» Students Ram, Shyam, and Raj measured the radius of an element A. The values of their practical were not the same (Ram = 110 nm, Shyam = 190 nm and Raj = 108 nm). Their teacher explained that their measurement was correct by saying that the recorded values are

Discussion

880.	If γ denotes the ratio of two specific heats of a gas, the ratio of slopes of adiabatic and isothermal PV curves at their point of intersection is
Answer» If $γ$ denotes the ratio of two specific heats of a gas, the ratio of slopes of adiabatic and isothermal PV curves at their point of intersection is

Discussion

881.	In Gabriel synthesis, amine is always an .
Answer» In Gabriel synthesis, amine is always an .

Discussion

882.	A valid Lewis structure cannot be drawn for which of the following compounds?(P=15, Si=14, C=6,)
Answer» A valid Lewis structure cannot be drawn for which of the following compounds? $(P = 15, S i = 14, C = 6,)$

Discussion

883.	Which are free radical reactionsI.CH3−CH=CH2+HBrPeroxide−−−−−→CH3−CH2−CH2BrII.CH3−CH=CH2+HBr→CH3−CHBr−CH3III.CH3−CH=CH2+Cl2→ClCH2−CH=CH2IV.CH3−CH3+Cl2→ClCH2−CH3
Answer» Which are free radical reactions $I . C H_{3} - C H = C H_{2} + H B r P e r o x i d e - ---- \to C H_{3} - C H_{2} - C H_{2} B r I I . C H_{3} - C H = C H_{2} + H B r \to C H_{3} - C H B r - C H_{3} I I I . C H_{3} - C H = C H_{2} + C l_{2} \to C l C H_{2} - C H = C H_{2} I V . C H_{3} - C H_{3} + C l_{2} \to C l C H_{2} - C H_{3}$

883.

Which are free radical reactionsI.CH3−CH=CH2+HBrPeroxide−−−−−→CH3−CH2−CH2BrII.CH3−CH=CH2+HBr→CH3−CHBr−CH3III.CH3−CH=CH2+Cl2→ClCH2−CH=CH2IV.CH3−CH3+Cl2→ClCH2−CH3

Answer»

Which are free radical reactions

$I . C H_{3} - C H = C H_{2} + H B r P e r o x i d e - ---- \to C H_{3} - C H_{2} - C H_{2} B r I I . C H_{3} - C H = C H_{2} + H B r \to C H_{3} - C H B r - C H_{3} I I I . C H_{3} - C H = C H_{2} + C l_{2} \to C l C H_{2} - C H = C H_{2} I V . C H_{3} - C H_{3} + C l_{2} \to C l C H_{2} - C H_{3}$

Discussion

884.	Which of the following option(s) correspond to the properties mentioned?
Answer» Which of the following option(s) correspond to the properties mentioned?

Discussion

885.	Heat of reaction for C6H12O6(s) + 6O2 → 6CO2(g) + 6H2O(v) at constant pressure is −651 K cal at 17∘ C. What is the heat of reaction at constant volume at 17∘ C?
Answer» Heat of reaction for $C_{6} H_{12} O_{6} (s) + 6 O_{2} \to 6 C O_{2} (g) + 6 H_{2} O (v)$ at constant pressure is $- 651 K c a l$ at $17^{\circ} C$ . What is the heat of reaction at constant volume at $17^{\circ} C$ ?

Discussion

886.	A molecule or ion is stable if
Answer» A molecule or ion is stable if

Discussion

887.	Primary amine on heating with CS2 followed by excess of mercuric chloride gives Isothiocyanate. The reaction is called
Answer» Primary amine on heating with $C S_{2}$ followed by excess of mercuric chloride gives Isothiocyanate. The reaction is called

Discussion

888.	Which of the following is known as oil of winter green?
Answer» Which of the following is known as oil of winter green?

Discussion

889.	The compound 'C' in the above sequence of reaction is
Answer» The compound 'C' in the above sequence of reaction is

889.

The compound 'C' in the above sequence of reaction is

Answer»

The compound 'C' in the above sequence of reaction is

Discussion

890.	Which of the following statements is correct for the boiling point of solvent containing a dissolved solid substance
Answer» Which of the following statements is correct for the boiling point of solvent containing a dissolved solid substance

Discussion

891.	Arrange the following in increasing order of +I effect :1∘Alkyl Group, 2∘Alkyl Group, 3∘Alkyl Groupand Methyl Group
Answer» Arrange the following in increasing order of $+ I$ effect : $1^{\circ} Alkyl Group, 2^{\circ} Alkyl Group, 3^{\circ} Alkyl Group and Methyl Group$

Discussion

892.	An ideal gas in thermally insulated vessel at internal pressure =P1. volume =V1 and absolute temperature =T1 expands irrversibly against zero external pressure. as shown in the diagram. The final internal pressure, volume and absolute temperature of the gas are P2,V2 and T2 respectively. for this expansion.
Answer» An ideal gas in thermally insulated vessel at internal pressure $= P_{1}$ . volume $= V_{1}$ and absolute temperature $= T_{1}$ expands irrversibly against zero external pressure. as shown in the diagram. The final internal pressure, volume and absolute temperature of the gas are $P_{2}, V_{2}$ and $T_{2}$ respectively. for this expansion.

Discussion

893.	The compressibility factor of helium as a real gas is ?
Answer» The compressibility factor of helium as a real gas is ?

Discussion

894.	Statement - I: Cd is a transition element.Statement - II: Cd and Cd2+ both have completely filled d− orbitals in their ground state.
Answer» Statement - I: $C d$ is a transition element. Statement - II: $C d$ and $C d^{2 +}$ both have completely filled $d -$ orbitals in their ground state.

Discussion

895.	Paragraph for below questionनीचे दिए गए प्रश्न के लिए अनुच्छेदCrystal field theory provides correct electronic distribution of central metal atom/ion under the influence of surrounding ligand field. Hence it clearly explains magnetic moments and colour of a complex.क्रिस्टल क्षेत्र सिद्धान्त, परिवेशी लीगेण्ड क्षेत्र के प्रभाव में केन्द्रीय धातु परमाणु/आयन का सही इलेक्ट्रॉनीय वितरण प्रदान करता है। अतः यह संकुल के चुम्बकीय आघूर्ण तथा रंग की व्याख्या स्पष्ट रूप से करता है।Q. The spin only magnetic moment of [VCl3(NMe3)3] isप्रश्न - [VCl3(NMe3)3] का चक्रण मात्र चुम्बकीय आघूर्ण है
Answer» Paragraph for below question नीचे दिए गए प्रश्न के लिए अनुच्छेद Crystal field theory provides correct electronic distribution of central metal atom/ion under the influence of surrounding ligand field. Hence it clearly explains magnetic moments and colour of a complex. क्रिस्टल क्षेत्र सिद्धान्त, परिवेशी लीगेण्ड क्षेत्र के प्रभाव में केन्द्रीय धातु परमाणु/आयन का सही इलेक्ट्रॉनीय वितरण प्रदान करता है। अतः यह संकुल के चुम्बकीय आघूर्ण तथा रंग की व्याख्या स्पष्ट रूप से करता है। Q. The spin only magnetic moment of [VCl₃(NMe₃)₃] is प्रश्न - [VCl₃(NMe₃)₃] का चक्रण मात्र चुम्बकीय आघूर्ण है

Discussion

896.	A reaction having equal energies of activation for forward and reverse reactions has
Answer» A reaction having equal energies of activation for forward and reverse reactions has

Discussion

897.	Freon (dichlorodifluoro methane) is used[CPMT 1986; DPMT 1983; CBSE PMT 2001]
Answer» Freon (dichlorodifluoro methane) is used [CPMT 1986; DPMT 1983; CBSE PMT 2001]

897.

Freon (dichlorodifluoro methane) is used[CPMT 1986; DPMT 1983; CBSE PMT 2001]

Answer»

Freon (dichlorodifluoro methane) is used

[CPMT 1986; DPMT 1983; CBSE PMT 2001]

Discussion

898.	The order of the bond angles in the following molecule is:
Answer» The order of the bond angles in the following molecule is:

Discussion

899.	The dynamic mass of a photon having a wavelength of 10 nm is:
Answer» The dynamic mass of a photon having a wavelength of 10 nm is:

Discussion

900.	What is the molarity of 4% W/W NaOH solution ?(Given: density of solution is 1.2 g/mL).
Answer» What is the molarity of $4 %$ W/W $N a O H$ solution ? (Given: density of solution is $1.2 g / m L$ ).

Discussion

Explore topic-wise InterviewSolutions in .

The vapour pressure of liquid water is 29.8 torr at 25∘ C. By what factor does the molar volume of water increases as it vaporizes to form an ideal gas under these conditions ? The density of liquid water is 1 g cm−3 at 298 K.

For this reaction at 300 K A(g)+B(g)→C(g) △U=−3.0 kcal;△S=−10.0 cal/K value of △G is :

The pH of 0.05 M aqueous solution of diethyl amine is 12.0. Calculate Kb.

In the following reactions, the product S is

Maximum pKb value is for

An open vessel at 27oC is heated until 38th of the air in it has been expelled. Assuming that the volume remains constant, calculate the temperature to which the vessel was heated.

When dil. H2SO4 is electrolysed by using platinum electrodes the gas evolved at cathode is

The correct order of +M effect of ′N′ containing functional group on benzene ring, amongst the given compounds is(I) (II)(III) (IV)

The dissociation constant of 0.05 M CH3COOH is given as 1.8×10−5. Calculate the percentage dissociation of CH3COOH in 0.2 M HCl solution.

Which of the following is not a linear polyatomic molecule?

Nature of aqueous solutions of two different amino acids 'X' and 'Y' are acidic and basic. Here 'X' and 'Y' are

First order X-ray reflection (λ = 154 pm) is maximum from a set of (2, 0, 0) planes of a B.C.C lattice was observed at 16∘, 6’. Then, the edge length of unit cell is

The elemental analysis of an organic compound containing C, H and O gives the percentage compositions of C and H to be 39.9% and 6.7% respectively. If the molecular weight of the compound is 180 u, then the number of carbon atoms present in the molecule is:

Which has maximum coordinating points?

List-I contains chiral molecules and List-II contains number of stereoisomers.Which of the following has the correct combination considering List-I and List-II?

A substance which participates readily in both acid-base and oxidation-reduction reactions is:

Among the following compounds, the one which can be dehydrated very easily is?

The number of moles of oxalate ions oxidized by one mole of MnO−4 ion in acidic medium.

What volume of water must be added to 50 mL of a 0.5 M H2SO4 to give a solution having a concentration of 0.1 M H2SO4?

The impossible overlap among the following is:

The major product of this reaction is:

Choose the correct increasing order of reactivity of alkyl halides with zinc and dilute HCl.

The density of a 0.438 M solution of potassium chromate at 298 K is 1.063 g cm−3. Calculate the vapour pressure of water above this solution. Given : P0 (water) = 23.79 mm Hg.

The boiling point of 0.2 mol kg−1solution of X in water is greater than equimolal solution of Y in water. Which one of the following statements is true in this case?

In an alkaline solution, the following equilibria exist. S2−+S→S2−2equilibrium constant K1 S2−2+S→S2−3 equilibrium constant K2K1 and K2 have the values 12 and 11, respectively.S2−3→S2−+2S. What is equilibrium constant for the reaction?

At 25∘C, the ionization constants of CH3COOH and NH3 are almost equal. The pH of a solution of 0.01 M CH3COOH is 4.0 at 25∘C. The pOH of 0.01 M NH4OH at the same temperature will be :

Which of the following compounds is metallic and ferromagnetic?

A 5 mL solution of 5 N H2SO4​ is diluted to 250 mL. What will be the normality of H2SO4 in the diluted solution ?

Students Ram, Shyam, and Raj measured the radius of an element A. The values of their practical were not the same(Ram = 110 nm, Shyam = 190 nm and Raj = 108 nm).Their teacher explained that their measurement was correct by saying that the recorded values are

If γ denotes the ratio of two specific heats of a gas, the ratio of slopes of adiabatic and isothermal PV curves at their point of intersection is

In Gabriel synthesis, amine is always an .

A valid Lewis structure cannot be drawn for which of the following compounds?(P=15, Si=14, C=6,)

Which are free radical reactionsI.CH3−CH=CH2+HBrPeroxide−−−−−→CH3−CH2−CH2BrII.CH3−CH=CH2+HBr→CH3−CHBr−CH3III.CH3−CH=CH2+Cl2→ClCH2−CH=CH2IV.CH3−CH3+Cl2→ClCH2−CH3

Which of the following option(s) correspond to the properties mentioned?

Heat of reaction for C6H12O6(s) + 6O2 → 6CO2(g) + 6H2O(v) at constant pressure is −651 K cal at 17∘ C. What is the heat of reaction at constant volume at 17∘ C?

A molecule or ion is stable if

Primary amine on heating with CS2 followed by excess of mercuric chloride gives Isothiocyanate. The reaction is called

Which of the following is known as oil of winter green?

The compound 'C' in the above sequence of reaction is

Which of the following statements is correct for the boiling point of solvent containing a dissolved solid substance

Arrange the following in increasing order of +I effect :1∘Alkyl Group, 2∘Alkyl Group, 3∘Alkyl Groupand Methyl Group

The compressibility factor of helium as a real gas is ?

Statement - I: Cd is a transition element.Statement - II: Cd and Cd2+ both have completely filled d− orbitals in their ground state.

A reaction having equal energies of activation for forward and reverse reactions has

Freon (dichlorodifluoro methane) is used[CPMT 1986; DPMT 1983; CBSE PMT 2001]

The order of the bond angles in the following molecule is:

The dynamic mass of a photon having a wavelength of 10 nm is:

What is the molarity of 4% W/W NaOH solution ?(Given: density of solution is 1.2 g/mL).

A 5 mL solution of 5 N H2SO4 is diluted to 250 mL. What will be the normality of H2SO4 in the diluted solution ?