1708 + Interview Questions in Chemistry Page 20 InterviewSolution

951.	The number of molecules in 1 kg of nitrogen gas sample (molar mass = 28 g/mol) is approximately:
Answer» The number of molecules in $1 kg$ of nitrogen gas sample (molar mass = 28 g/mol) is approximately:

Discussion

952.	Calculate the atomic mass of S - atom in grams?
Answer» Calculate the atomic mass of $S$ - atom in grams?

Discussion

953.	Match the atomic masses of the following:(a) K (i) 55(b) Mn (ii) 39(c) O (iii) 16(d) Mg (iv) 24.3
Answer» Match the atomic masses of the following: (a) K (i) 55 (b) Mn (ii) 39 (c) O (iii) 16 (d) Mg (iv) 24.3

Discussion

954.	Enthalpy of combustion of CH4,C2H6 and C3H8 are -210.8, -368.4 and -526.2 k cal mol−1 respectively. Enthalpy of combustion of hexane can be predicted as ?
Answer» Enthalpy of combustion of $C H_{4}, C_{2} H_{6}$ and $C_{3} H_{8}$ are -210.8, -368.4 and -526.2 k cal $m o l^{- 1}$ respectively. Enthalpy of combustion of hexane can be predicted as ?

Discussion

955.	Select the right conventional representation for axial and equatorial hydrogens among the following.
Answer» Select the right conventional representation for axial and equatorial hydrogens among the following.

Discussion

956.	Complexes formed in the cyanide process are:
Answer» Complexes formed in the cyanide process are:

Discussion

957.	For the redox reaction MnO−4+C2O−24+H+→Mn2++CO2+H2O the correct coefficients of the reactants for the balanced reaction are
Answer» For the redox reaction $M n O_{4}^{-} + C_{2} O_{4}^{- 2} + H^{+} \to M n^{2 +} + C O_{2} + H_{2} O$ the correct coefficients of the reactants for the balanced reaction are

Discussion

958.	N02 atoms of X(g) are converted into X+(g) by absorbing E1 energy. 2N0 atoms of X(g) are converted into X−(g) by releasing E2 energy. Calculate the ionisation enthalpy and electron gain enthalpy of X(g) per atom.
Answer» $\frac{N_{0}}{2}$ atoms of $X (g)$ are converted into $X^{+} (g)$ by absorbing $E_{1}$ energy. $2 N_{0}$ atoms of $X (g)$ are converted into $X^{-} (g)$ by releasing $E_{2}$ energy. Calculate the ionisation enthalpy and electron gain enthalpy of $X (g)$ per atom.

Discussion

959.	Which of the following cannot be formed as single major product by Wurtz's coupling reaction of an alkyl halide?
Answer» Which of the following cannot be formed as single major product by Wurtz's coupling reaction of an alkyl halide?

Discussion

960.	Solids CaCO3 and CaO and gaseous CO2 are placed in a vessel and allowed to reach equilibriumCaO(s)+CO2(g)⇌CaCO3(s) ΔH =−180 kJ mol−1The quantity of CaO in the vessel could be increased by:
Answer» Solids $C a C O_{3}$ and CaO and gaseous $C O_{2}$ are placed in a vessel and allowed to reach equilibrium $C a O (s) + C O_{2} (g) ⇌ C a C O_{3} (s) Δ H = - 180 k J m o l^{- 1}$ The quantity of CaO in the vessel could be increased by:

960.

Solids CaCO3 and CaO and gaseous CO2 are placed in a vessel and allowed to reach equilibriumCaO(s)+CO2(g)⇌CaCO3(s) ΔH =−180 kJ mol−1The quantity of CaO in the vessel could be increased by:

Answer»

Solids $C a C O_{3}$ and CaO and gaseous $C O_{2}$ are placed in a vessel and allowed to reach equilibrium

$C a O (s) + C O_{2} (g) ⇌ C a C O_{3} (s) Δ H = - 180 k J m o l^{- 1}$

The quantity of CaO in the vessel could be increased by:

Discussion

961.	Find the dissociation constant Ka of a weak monobasic acid which is 3.5% dissociated in a N10 solution at 25∘C
Answer» Find the dissociation constant $K_{a}$ of a weak monobasic acid which is 3.5% dissociated in a $\frac{N}{10}$ solution at $25^{\circ} C$

Discussion

962.	The circulation of blood in human body supplies O2 and releases CO2. The concentration of O2 and CO2 is variable but on an average, 100 mL blood contains 0.02 g of O2 and 0.08 g of CO2. The volume of O2 and CO2 at 1 atm and at body temperature 37∘ C, assuming 10 L blood in human body, is
Answer» The circulation of blood in human body supplies $O_{2}$ and releases $C O_{2}$ . The concentration of $O_{2}$ and $C O_{2}$ is variable but on an average, $100 mL$ blood contains $0.02 g$ of $O_{2}$ and $0.08 g$ of $C O_{2}$ . The volume of $O_{2}$ and $C O_{2}$ at $1 atm$ and at body temperature $37^{\circ} C$ , assuming $10 L$ blood in human body, is

Discussion

963.	In the following reaction, Na2S2O3 is converted to Na2S4O6.2Na2S2O3+I2→Na2S4O6 + 2NaIThe equivalent weight of Na2S2O3 for this reaction is:(The molecular weight of Na2S2O3=M)
Answer» In the following reaction, $N a_{2} S_{2} O_{3}$ is converted to $N a_{2} S_{4} O_{6}$ . $2 N a_{2} S_{2} O_{3} + I_{2} \to N a_{2} S_{4} O_{6} + 2 N a I$ The equivalent weight of $N a_{2} S_{2} O_{3}$ for this reaction is: (The molecular weight of $N a_{2} S_{2} O_{3} = M)$

Discussion

964.	Calculate the number of oxygen atoms required to combine with 7 g of N2 to form N2O3 when 80% of N2 is converted to N2O3.
Answer» Calculate the number of oxygen atoms required to combine with 7 g of $N_{2}$ to form $N_{2} O_{3}$ when $80 %$ of $N_{2}$ is converted to $N_{2} O_{3}$ .

Discussion

965.	General formula of primary alcohol is [CPMT 1975]
Answer» General formula of primary alcohol is [CPMT 1975]

Discussion

966.	The stability of hydrophilic sol is due to -
Answer» The stability of hydrophilic sol is due to -

Discussion

967.	Which of the following will produce p-type semiconductor?
Answer» Which of the following will produce p-type semiconductor?

Discussion

968.	Iron exhibits bcc structure at room temperature. Above 900°C, it transforms to fcc structure. The ratio of density of iron at room temperature to that at 900°C (assuming molar mass and atomic radii of iron remains constant with temperature) is:
Answer» Iron exhibits bcc structure at room temperature. Above 900°C, it transforms to fcc structure. The ratio of density of iron at room temperature to that at 900°C (assuming molar mass and atomic radii of iron remains constant with temperature) is:

Discussion

969.	Aniline when diazotized in cold and then treated with dimethyl aniline gives a coloured product. Its structure would be.
Answer» Aniline when diazotized in cold and then treated with dimethyl aniline gives a coloured product. Its structure would be.

Discussion

970.	Two solutions S1 and S2 containing 0.1 M NaCl (aq) and 0.05 M BaCl2 (aq) are separated by semipermeable membrane. Which among the following statement(s) is/are correct? (Assume complete dissociation of both the electrolytes).
Answer» Two solutions $S_{1}$ and $S_{2}$ containing 0.1 M NaCl (aq) and 0.05 M $B a C l_{2} (a q)$ are separated by semipermeable membrane. Which among the following statement(s) is/are correct? (Assume complete dissociation of both the electrolytes).

Discussion

971.	Which of the following is most reactive towards, Markovnikov addition?
Answer» Which of the following is most reactive towards, Markovnikov addition?

Discussion

972.	Which of the following statements is correct for a reversible process in a state of equilibrium ?
Answer» Which of the following statements is correct for a reversible process in a state of equilibrium ?

Discussion

973.	The order of ionisation energies of the coinage metals is:
Answer» The order of ionisation energies of the coinage metals is:

Discussion

974.	The end product ‘W’, in the following sequence of reactions
Answer» The end product ‘W’, in the following sequence of reactions

Discussion

975.	is amphoteric in nature
Answer» is amphoteric in nature

Discussion

976.	For the reaction 3A (g) k→ B(g) + C (g), k is 10−4 Lmol−1min−1. If [A] = 0.5 M then the value of −d[A]dt (in Ms−1) is
Answer» For the reaction $3 A (g) k \to B (g) + C (g)$ , k is $10^{- 4} L m o l^{- 1} m i n^{- 1}$ . If [A] = 0.5 M then the value of $\frac{- d [A]}{dt}$ (in $M s^{- 1}$ ) is

Discussion

977.	The value of 200 lb in kilograms is
Answer» The value of $200 l b$ in kilograms is

Discussion

978.	Alkanes could be synthesized by:
Answer» Alkanes could be synthesized by:

Discussion

979.	The monomer of polystyrene is
Answer» The monomer of polystyrene is

Discussion

980.	The monomeric units of terylene are glycol and which of the following?
Answer» The monomeric units of terylene are glycol and which of the following?

Discussion

981.	If the law of conservation of mass was to hold true, then 20.8 g of BaCl2 on reaction with 9.8 g of H2SO4 will produce 7.3 gm of HCl and what mass of BaSO4?
Answer» If the law of conservation of mass was to hold true, then $20.8 g$ of $B a C l_{2}$ on reaction with $9.8 g$ of $H_{2} S O_{4}$ will produce $7.3 gm$ of $H C l$ and what mass of $B a S O_{4}$ ?

Discussion

982.	Drugs which helps to reduce anxiety and brings about calmness is
Answer» Drugs which helps to reduce anxiety and brings about calmness is

Discussion

983.	The equilibrium,NH4HS(s)⇌NH3(g)+H2S(g), is followed to set-up at 127 ∘C in a closed vessel. The total pressure at equilibrium was 20 atm. The Kc for the reaction is:(Given R=0.08 L atm K−1 mol−1)
Answer» The equilibrium, $N H_{4} H S (s) ⇌ N H_{3} (g) + H_{2} S (g)$ , is followed to set-up at $127^{\circ} C$ in a closed vessel. The total pressure at equilibrium was $20 atm$ . The $K_{c}$ for the reaction is: (Given $R = 0.08 {L atm K}^{- 1} {mol}^{- 1}$ )

Discussion

984.	Which among the following has the highest dipole moment?
Answer» Which among the following has the highest dipole moment?

Discussion

985.	Consider the following reactionxMnO−4+yC2O2−4+zH+⟶Mn+2+2yCO2+z2H2Othe values of x,y and z in the reaction are, respectively:
Answer» Consider the following reaction $x M n O_{4}^{-} + y C_{2} O_{4}^{2 -} + z H^{+} ⟶ M n^{+ 2} + 2 y C O_{2} + \frac{z}{2} H_{2} O$ the values of x,y and z in the reaction are, respectively:

985.

Consider the following reactionxMnO−4+yC2O2−4+zH+⟶Mn+2+2yCO2+z2H2Othe values of x,y and z in the reaction are, respectively:

Answer»

Consider the following reaction

$x M n O_{4}^{-} + y C_{2} O_{4}^{2 -} + z H^{+} ⟶ M n^{+ 2} + 2 y C O_{2} + \frac{z}{2} H_{2} O$

the values of x,y and z in the reaction are, respectively:

Discussion

986.	The compound C5H13N is optically active and reacts with HONO to give C5H11OH. The compound is
Answer» The compound C₅H₁₃N is optically active and reacts with HONO to give C₅H₁₁OH. The compound is

Discussion

987.	A 3 L container has a gas at 4 atm pressure and 27 ∘C. If 2 L of the same gas at 2 atm is added to this container at same temperature, then what will be the new pressure in the container?
Answer» A $3 L$ container has a gas at $4 atm$ pressure and $27^{\circ} C$ . If $2 L$ of the same gas at $2 atm$ is added to this container at same temperature, then what will be the new pressure in the container?

Discussion

988.	Among the given set of oxides the sets in which both the oxides are not amphoteric is/are: Mn2O7,CrO3,Cr2O3,CrO,V2O5,V2O4
Answer» Among the given set of oxides the sets in which both the oxides are not amphoteric is/are: $M n_{2} O_{7}, C r O_{3}, C r_{2} O_{3}, C r O, V_{2} O_{5}, V_{2} O_{4}$

Discussion

989.	Each carbon atom in benzene is in which state of hybridization?
Answer» Each carbon atom in benzene is in which state of hybridization?

Discussion

990.	Number of chain isomer of C5H12 is :
Answer» Number of chain isomer of $C_{5} H_{12}$ is :

Discussion

991.	Calculate the heat evolved when 496 g of white phosphorus P4 burns in air according to equationP4(s)+5O2(g)→P4O10(s) ΔH=−3013 kJ/mol
Answer» Calculate the heat evolved when 496 g of white phosphorus $P_{4}$ burns in air according to equation $P_{4} (s) + 5 O_{2} (g) \to P_{4} O_{10} (s)$ $Δ H = - 3013 k J / m o l$

Discussion

992.	Calculate the lattice formation enthalpy in kJ mol−1of LiF given thatEnthalpy of sublimation of lithium = 155.3 kJ mol−1Dissociation enthalpy of half mole of F2=75.3 kJIonization enthalpy of lithium =520 kJ mol−1Electron gain enthalpy of 1 mol of F(g) =−333 kJΔfHoverall=−594 kJ mol−1
Answer» Calculate the lattice formation enthalpy in ${kJ mol}^{- 1}$ of $L i F$ given that Enthalpy of sublimation of lithium = $155.3 {kJ mol}^{- 1}$ Dissociation enthalpy of half mole of $F_{2} = 75.3 kJ$ Ionization enthalpy of lithium $= 520 {kJ mol}^{- 1}$ Electron gain enthalpy of 1 mol of $F (g) = - 333 kJ Δ_{f} H_{overall} = - 594 {kJ mol}^{- 1}$

Discussion

993.	The increasing order of the rate of reaction with HNO3/H2SO4:
Answer» The increasing order of the rate of reaction with $H N O_{3} / H_{2} S O_{4}$ :

Discussion

994.	Calculate the energy of radiation emitted for the electronic transition from infinity to ground state for Li2+ ion.(Given:c=3×108 m/s, RH=1.09678×107 m−1h=6.626×10−34 J s−1)
Answer» Calculate the energy of radiation emitted for the electronic transition from infinity to ground state for $L i^{2 +}$ ion. $(Given : c = 3 \times 10^{8} m/s, R_{H} = 1.09678 \times 10^{7} m^{- 1}$ $h = 6.626 \times 10^{- 34} {J s}^{- 1})$

Discussion

995.	If an extra particle is occupying the voids. The defect is called __.
Answer» If an extra particle is occupying the voids. The defect is called __.

Discussion

996.	The reaction, Sucrose→Fructose+Glucose, takes place at a certain temperature while the volume of the solution is maintained at 1 L. At t = 0, the initial rotation of the mixture is 34∘. After 30 minutes the total rotation is 19∘and after a very long time, the total rotation is −11∘. Find the time when solution was optically inactive.
Answer» The reaction, $S u c r o s e \to F r u c t o s e + G l u c o s e$ , takes place at a certain temperature while the volume of the solution is maintained at 1 L. At t = 0, the initial rotation of the mixture is $34^{\circ}$ . After 30 minutes the total rotation is $19^{\circ}$ and after a very long time, the total rotation is $- 11^{\circ}$ . Find the time when solution was optically inactive.

Discussion

997.	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

998.	At constant volume, for a fixed number of moles of a gas, the pressure of the gas increases with increase in temperature due to
Answer» At constant volume, for a fixed number of moles of a gas, the pressure of the gas increases with increase in temperature due to

998.

At constant volume, for a fixed number of moles of a gas, the pressure of the gas increases with increase in temperature due to

Answer»

At constant volume, for a fixed number of moles of a gas, the pressure of the gas increases with increase in temperature due to

Discussion

999.	During the electrolytic extraction of Aluminium, purified alumina is mixed with Na3 AlF6 and CaF2. Why?
Answer» During the electrolytic extraction of Aluminium, purified alumina is mixed with $N a_{3}$ $A l F_{6}$ and $C a F_{2}$ . Why?

Discussion

1000.	If a curve y=f(x) passes through the point (1,2) and satisfies xdydx+y=bx4, then for what value of b, 2∫1f(x)dx=625 ?
Answer» If a curve $y = f (x)$ passes through the point $(1, 2)$ and satisfies $x \frac{d y}{d x} + y = b x^{4},$ then for what value of $b,$ $2 \int 1 f (x) d x = \frac{62}{5}$ ?

Discussion

Explore topic-wise InterviewSolutions in .

The number of molecules in 1 kg of nitrogen gas sample (molar mass = 28 g/mol) is approximately:

Calculate the atomic mass of S - atom in grams?

Match the atomic masses of the following:(a) K (i) 55(b) Mn (ii) 39(c) O (iii) 16(d) Mg (iv) 24.3

Enthalpy of combustion of CH4,C2H6 and C3H8 are -210.8, -368.4 and -526.2 k cal mol−1 respectively. Enthalpy of combustion of hexane can be predicted as ?

Select the right conventional representation for axial and equatorial hydrogens among the following.

Complexes formed in the cyanide process are:

For the redox reaction MnO−4+C2O−24+H+→Mn2++CO2+H2O the correct coefficients of the reactants for the balanced reaction are

N02 atoms of X(g) are converted into X+(g) by absorbing E1 energy. 2N0 atoms of X(g) are converted into X−(g) by releasing E2 energy. Calculate the ionisation enthalpy and electron gain enthalpy of X(g) per atom.

Which of the following cannot be formed as single major product by Wurtz's coupling reaction of an alkyl halide?

Solids CaCO3 and CaO and gaseous CO2 are placed in a vessel and allowed to reach equilibriumCaO(s)+CO2(g)⇌CaCO3(s) ΔH =−180 kJ mol−1The quantity of CaO in the vessel could be increased by:

Find the dissociation constant Ka of a weak monobasic acid which is 3.5% dissociated in a N10 solution at 25∘C

The circulation of blood in human body supplies O2 and releases CO2. The concentration of O2 and CO2 is variable but on an average, 100 mL blood contains 0.02 g of O2 and 0.08 g of CO2. The volume of O2 and CO2 at 1 atm and at body temperature 37∘ C, assuming 10 L blood in human body, is

In the following reaction, Na2S2O3 is converted to Na2S4O6.2Na2S2O3+I2→Na2S4O6 + 2NaIThe equivalent weight of Na2S2O3 for this reaction is:(The molecular weight of Na2S2O3=M)

Calculate the number of oxygen atoms required to combine with 7 g of N2 to form N2O3 when 80% of N2 is converted to N2O3.

General formula of primary alcohol is [CPMT 1975]

The stability of hydrophilic sol is due to -

Which of the following will produce p-type semiconductor?

Iron exhibits bcc structure at room temperature. Above 900°C, it transforms to fcc structure. The ratio of density of iron at room temperature to that at 900°C (assuming molar mass and atomic radii of iron remains constant with temperature) is:

Aniline when diazotized in cold and then treated with dimethyl aniline gives a coloured product. Its structure would be.

Two solutions S1 and S2 containing 0.1 M NaCl (aq) and 0.05 M BaCl2 (aq) are separated by semipermeable membrane. Which among the following statement(s) is/are correct? (Assume complete dissociation of both the electrolytes).

Which of the following is most reactive towards, Markovnikov addition?

Which of the following statements is correct for a reversible process in a state of equilibrium ?

The order of ionisation energies of the coinage metals is:

The end product ‘W’, in the following sequence of reactions

is amphoteric in nature

For the reaction 3A (g) k→ B(g) + C (g), k is 10−4 Lmol−1min−1. If [A] = 0.5 M then the value of −d[A]dt (in Ms−1) is

The value of 200 lb in kilograms is

Alkanes could be synthesized by:

The monomer of polystyrene is

The monomeric units of terylene are glycol and which of the following?

If the law of conservation of mass was to hold true, then 20.8 g of BaCl2 on reaction with 9.8 g of H2SO4 will produce 7.3 gm of HCl and what mass of BaSO4?

Drugs which helps to reduce anxiety and brings about calmness is

The equilibrium,NH4HS(s)⇌NH3(g)+H2S(g), is followed to set-up at 127 ∘C in a closed vessel. The total pressure at equilibrium was 20 atm. The Kc for the reaction is:(Given R=0.08 L atm K−1 mol−1)

Which among the following has the highest dipole moment?

Consider the following reactionxMnO−4+yC2O2−4+zH+⟶Mn+2+2yCO2+z2H2Othe values of x,y and z in the reaction are, respectively:

The compound C5H13N is optically active and reacts with HONO to give C5H11OH. The compound is

A 3 L container has a gas at 4 atm pressure and 27 ∘C. If 2 L of the same gas at 2 atm is added to this container at same temperature, then what will be the new pressure in the container?

Among the given set of oxides the sets in which both the oxides are not amphoteric is/are: Mn2O7,CrO3,Cr2O3,CrO,V2O5,V2O4

Each carbon atom in benzene is in which state of hybridization?

Number of chain isomer of C5H12 is :

Calculate the heat evolved when 496 g of white phosphorus P4 burns in air according to equationP4(s)+5O2(g)→P4O10(s) ΔH=−3013 kJ/mol

Calculate the lattice formation enthalpy in kJ mol−1of LiF given thatEnthalpy of sublimation of lithium = 155.3 kJ mol−1Dissociation enthalpy of half mole of F2=75.3 kJIonization enthalpy of lithium =520 kJ mol−1Electron gain enthalpy of 1 mol of F(g) =−333 kJΔfHoverall=−594 kJ mol−1

The increasing order of the rate of reaction with HNO3/H2SO4:

Calculate the energy of radiation emitted for the electronic transition from infinity to ground state for Li2+ ion.(Given:c=3×108 m/s, RH=1.09678×107 m−1h=6.626×10−34 J s−1)

If an extra particle is occupying the voids. The defect is called __.

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 ?

At constant volume, for a fixed number of moles of a gas, the pressure of the gas increases with increase in temperature due to

During the electrolytic extraction of Aluminium, purified alumina is mixed with Na3 AlF6 and CaF2. Why?

If a curve y=f(x) passes through the point (1,2) and satisfies xdydx+y=bx4, then for what value of b, 2∫1f(x)dx=625 ?