2600 + Interview Questions in Chemistry Page 20 InterviewSolution

951.	How many electrons should be added to the reactant to balance the atom whose oxidation number is changing?Cr2O2−7⟶Cr+36
Answer» How many electrons should be added to the reactant to balance the atom whose oxidation number is changing? $C r_{2} O_{7}^{2 -}$ $⟶$ $C r^{+ 3}$ 6

951.

How many electrons should be added to the reactant to balance the atom whose oxidation number is changing?Cr2O2−7⟶Cr+36

Answer»

How many electrons should be added to the reactant to balance the atom whose oxidation number is changing?

$C r_{2} O_{7}^{2 -}$ $⟶$ $C r^{+ 3}$

6

952.	What is the correct product of the following reaction?
Answer» What is the correct product of the following reaction?

Discussion

953.	Silver benzoate will react with bromine in acetone to form
Answer» Silver benzoate will react with bromine in acetone to form

Discussion

954.	According to Bronsted-Lowry concept, the relative strengths of the bases CH3COO−, OH− and Cl− are in the order:
Answer» According to Bronsted-Lowry concept, the relative strengths of the bases $C H_{3} C O O^{-}$ , $O H^{-}$ and $C l^{-}$ are in the order:

Discussion

955.	The energy of an electron in the second and the third Bohr's orbits of a hydrogen atom is −5.42×10−12 erg and −2.41×10−12 erg respectively. Calculate the wavelength of the emitted radiation when the electron drops from the third to the second orbit.
Answer» The energy of an electron in the second and the third Bohr's orbits of a hydrogen atom is $- 5.42 \times 10^{- 12} erg$ and $- 2.41 \times 10^{- 12} erg$ respectively. Calculate the wavelength of the emitted radiation when the electron drops from the third to the second orbit.

Discussion

956.	For an equilibrium H2O(s)⇌H2O(l), which of the following statements is true?
Answer» For an equilibrium $H_{2} O (s) ⇌ H_{2} O (l)$ , which of the following statements is true?

956.

For an equilibrium H2O(s)⇌H2O(l), which of the following statements is true?

Answer»

For an equilibrium $H_{2} O (s) ⇌ H_{2} O (l)$ , which of the following statements is true?

Discussion

957.	1 mol of an ideal gas for which Cv=32R is heated reversibly at a constant pressure of 1 atm from 25 oC to 100 oC. The △H is:Given: R=1.987 cal
Answer» $1$ mol of an ideal gas for which $C_{v} = \frac{3}{2} R$ is heated reversibly at a constant pressure of $1$ atm from $25^{o} C$ to $100^{o} C$ . The $△ H$ is: Given: $R = 1.987 cal$

Discussion

958.	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

959.	Which will be the least stable resonating structure?
Answer» Which will be the least stable resonating structure?

Discussion

960.	A waxy white solid is burnt in air (with an excess supply of air) in an extraordinarily exothermic reaction. The product of this reaction rapidly undergoes complete hydrolysis to yield an acid X. The acid X is:
Answer» A waxy white solid is burnt in air (with an excess supply of air) in an extraordinarily exothermic reaction. The product of this reaction rapidly undergoes complete hydrolysis to yield an acid X. The acid X is:

Discussion

961.	The energies of activation for forward and reverse reactions for A2+B2⇌2AB are 180 kJ mol−1 and 200 kJ mol−1 respectively. The presence of a catalyst lowers activation energy of both reactions by 100 kJ mol−1. The enthalpy change of the reaction (A2+B2→2AB) in the presence of a catalyst will be (in kJ mol−1)
Answer» The energies of activation for forward and reverse reactions for $A_{2} + B_{2} ⇌ 2 A B$ are $180 k J m o l^{- 1}$ and $200 k J m o l^{- 1}$ respectively. The presence of a catalyst lowers activation energy of both reactions by $100 k J m o l^{- 1}$ . The enthalpy change of the reaction $(A_{2} + B_{2} \to 2 A B)$ in the presence of a catalyst will be (in kJ $m o l^{- 1}$ )

Discussion

962.	Which of the following can be a possible contact angle with water for a colloidal particle?
Answer» Which of the following can be a possible contact angle with water for a colloidal particle?

Discussion

963.	What is the mass of silver deposited on the passage of 2 A current during the electrolysis of silver?Electrochemical equivalent of silver = 1.18×10−3 gm C−1
Answer» What is the mass of silver deposited on the passage of 2 A current during the electrolysis of silver? Electrochemical equivalent of silver = $1.18 \times 10^{- 3} g m C^{- 1}$

Discussion

964.	In the electrolytic cell, flow of electrons is fron:
Answer» In the electrolytic cell, flow of electrons is fron:

Discussion

965.	An ester (X) on hydrolysis gives an acid 'A' and alcohol 'B'. The sodium salt of 'A' on electrolysis gives ethane. When 'B' is distilled with aqueous bleaching powder it forms chloroform. Therefore 'X' may be
Answer» An ester (X) on hydrolysis gives an acid 'A' and alcohol 'B'. The sodium salt of 'A' on electrolysis gives ethane. When 'B' is distilled with aqueous bleaching powder it forms chloroform. Therefore 'X' may be

Discussion

966.	Aniline is diazotized and the diazonium salt hydrolysed to yield phenol which is brominated to produce C6H2(Br3)OH. Calculate the mass of the final product obtained from 9.3 g of aniline if the yield in the two steps is 45% and 70% (Atomic mass of Br = 80) ?
Answer» Aniline is diazotized and the diazonium salt hydrolysed to yield phenol which is brominated to produce $C_{6} H_{2} (B r_{3}) O H .$ Calculate the mass of the final product obtained from 9.3 g of aniline if the yield in the two steps is 45% and 70% (Atomic mass of Br = 80) ?

Discussion

967.	A 140 W heater was placed in 2.00 kg of methanol (CH3OH) and turned on for exactly 2 min. The temperature increased by 4.24 K. Assuming that all the heat is absorbed by methanol, then molar heat capacity of methanol is
Answer» A $140 W$ heater was placed in $2.00 k g$ of methanol $(C H_{3} O H)$ and turned on for exactly 2 min. The temperature increased by $4.24 K$ . Assuming that all the heat is absorbed by methanol, then molar heat capacity of methanol is

Discussion

968.	The correct order of atomic radii among the following elements is:
Answer» The correct order of atomic radii among the following elements is:

Discussion

969.	2H3C−COOAgI2−−−→CCl4P(an ester)+CO2+AgIWhich of the following reactions will also give the same product P?
Answer» $2 H_{3} C - C O O A g I_{2} - -- \to C C l_{4} P (a n e s t e r) + C O_{2} + A g I$ Which of the following reactions will also give the same product P?

Discussion

970.	Nylon is an example of
Answer» Nylon is an example of

Discussion

971.	Which of the following molecule(s) gives only acid(s) or acidic species on hydrolysis?
Answer» Which of the following molecule(s) gives only acid(s) or acidic species on hydrolysis?

Discussion

972.	A gas contained in a cylinder fitted with a frictionless piston expands against a constant pressure 1 atmosphere from a volume of 4 litre to a volume of 14 litre. In doing so, it absorbs 800 J thermal energy from surrounding . Determine △U for the process.
Answer» A gas contained in a cylinder fitted with a frictionless piston expands against a constant pressure 1 atmosphere from a volume of 4 litre to a volume of 14 litre. In doing so, it absorbs 800 J thermal energy from surrounding . Determine $△ U$ for the process.

Discussion

973.	GivenCuI(s)+e−⟶Cu(s)+I−(aq);E∘=−0.188V ...(i)Cu2+(aq)+I−+e−⟶CuI(s);E∘=0.868V ...(ii)Ksp(CuI)=10−12M2 ...(iii)298R ln 10F=0.059List -1 contains half cells and List-2 contains emf values of half cellsList - IList - II(P)Cu+(aq)+e−⟶Cu(s);E01=(1)0.34 V(Q)Cu2+(aq)+e−⟶Cu+(aq);E02=(2)0.16 V(R)Cu2+(aq)+2e−⟶Cu(s);E03=(3)0.52 V(S)Cu2+(1M)+I−(10−12M)+e−⟶CuI(s);E4=(4)(E01−E03−0.02)V(5)2×E02+0.02Match the emf of cell in LIST-I with one or more values in LIST-II and choose the correct option.
Answer» Given $C u I_{(s)} + e^{-} ⟶ C u_{(s)} + I_{(a q)}^{-}; E^{\circ} = - 0.188 V . . . (i) C u_{(a q)}^{2 +} + I^{-} + e^{-} ⟶ C u I_{(s)}; E^{\circ} = 0.868 V . . . (i i) K_{s p} (C u I) = 10^{- 12} M^{2} . . . (i i i)$ $\frac{298 R l n 10}{F} = 0.059$ List -1 contains half cells and List-2 contains emf values of half cells $\begin{matrix} List - I & List - II (P) & C u_{(a q)}^{+} + e^{-} ⟶ C u_{(s)}; E_{1}^{0} = & (1) & 0.34 V (Q) & C u_{(a q)}^{2 +} + e^{-} ⟶ C u_{(a q)}^{+}; E_{2}^{0} = & (2) & 0.16 V (R) & C u_{(a q)}^{2 +} + 2 e^{-} ⟶ C u_{(s)}; E_{3}^{0} = & (3) & 0.52 V (S) & C u_{(1 M)}^{2 +} + I_{(10^{- 12} M)}^{-} + e^{-} ⟶ C u I (s); E_{4} = & (4) & (E_{1}^{0} - E_{3}^{0} - 0.02) V (5) & 2 \times E_{2}^{0} + 0.02 \end{matrix}$ Match the emf of cell in LIST-I with one or more values in LIST-II and choose the correct option.

Discussion

974.	A certain laser transition emits 6.37×1015 quanta sec−1m−2. Calculate the power output in J sec−1 m−2.Given: λ=632.8 nm
Answer» A certain laser transition emits $6.37 \times 10^{15} {quanta sec}^{- 1} m^{- 2}$ . Calculate the power output in ${J sec}^{- 1} m^{- 2}$ . Given: $λ = 632.8 nm$

Discussion

975.	What will be the molarity of a solution containing 5 g of sodium hydroxide in 250 ml solution:
Answer» What will be the molarity of a solution containing 5 g of sodium hydroxide in 250 ml solution:

Discussion

976.	Chlorine is in +1 oxidation state in
Answer» Chlorine is in +1 oxidation state in

Discussion

977.	Which of the following is a high spin complex?
Answer» Which of the following is a high spin complex?

Discussion

978.	Polarization is an important phenomenon which is helpful in determination of covalent nature of compound. With the help of Fajan's rule one can easily predict the nature of compound.Which of the following halide possess the highest covalent character?
Answer» Polarization is an important phenomenon which is helpful in determination of covalent nature of compound. With the help of Fajan's rule one can easily predict the nature of compound. Which of the following halide possess the highest covalent character?

Discussion

979.	Identify the correct labels of A,B and C in the following graph from the options given below:Root mean square speed (urms); most probable speed (ump); Average speed (uav)
Answer» Identify the correct labels of $A, B$ and $C$ in the following graph from the options given below: Root mean square speed $(u_{r m s})$ ; most probable speed $(u_{m p})$ ; Average speed $(u_{a v})$

Discussion

980.	Propose structures for hydrocarbons that give the following products on oxidative cleavage by KMnO4 or O3:
Answer» Propose structures for hydrocarbons that give the following products on oxidative cleavage by $K M n O_{4}$ or $O_{3}$ :

Discussion

981.	(CH3COO)2Pb+Ca(OH)2→A+(CH3COO)2CaA+CaOCl2→B+CaCl2+H2OIdentify A and B.
Answer» $(C H_{3} C O O)_{2} P b + C a (O H)_{2} \to A + (C H_{3} C O O)_{2} C a$ $A + C a O C l_{2} \to B + C a C l_{2} + H_{2} O$ Identify A and B.

981.

(CH3COO)2Pb+Ca(OH)2→A+(CH3COO)2CaA+CaOCl2→B+CaCl2+H2OIdentify A and B.

Answer»

$(C H_{3} C O O)_{2} P b + C a (O H)_{2} \to A + (C H_{3} C O O)_{2} C a$

$A + C a O C l_{2} \to B + C a C l_{2} + H_{2} O$

Identify A and B.

Discussion

982.	The number of atoms in face-centered cubic and hexagonal unit cells respectively are ?
Answer» The number of atoms in face-centered cubic and hexagonal unit cells respectively are ?

Discussion

983.	On moving across a period, the atomic size decreases and nuclear charge increases and therefore the force of attraction exerted by the nucleus on the electron in the outermost shell increases.Potassium forms K+ ion but it does not form K2+ because of;
Answer» On moving across a period, the atomic size decreases and nuclear charge increases and therefore the force of attraction exerted by the nucleus on the electron in the outermost shell increases. Potassium forms $K^{+}$ ion but it does not form $K^{2 +}$ because of;

Discussion

984.	A redox reaction is:
Answer» A redox reaction is:

Discussion

985.	The vapour pressure of pure benzene and toluene are 160 and 60 torr respectively. The molefraction of toluene in vapour phase in contact with equimolar solution of benzene and toluene is
Answer» The vapour pressure of pure benzene and toluene are 160 and 60 torr respectively. The molefraction of toluene in vapour phase in contact with equimolar solution of benzene and toluene is

Discussion

986.	Nitrogen has the electronic configuration 1s2,2s2 2p1x 2p1y 2p1z and not 1s2,2s2 2p2x 2p1y 2p0z which is determined by
Answer» Nitrogen has the electronic configuration $1 s^{2}, 2 s^{2} 2 p_{x}^{1} 2 p_{y}^{1} 2 p_{z}^{1}$ and not $1 s^{2}, 2 s^{2} 2 p_{x}^{2} 2 p_{y}^{1} 2 p_{z}^{0}$ which is determined by

Discussion

987.	Of the five isomeric hexanes, the isomer which can give two monochlorinated compounds is
Answer» Of the five isomeric hexanes, the isomer which can give two monochlorinated compounds is

Discussion

988.	GivenE∘Cl2/Cl−=1.36 V,E∘Cr3+/Cr=−0.74VE∘Cr2O2−7/Cr3+=1.33V,E∘MnO−4/Mn2+=1.51VAmong the following, the strongest reducing agent is
Answer» Given $E_{C l_{2} / C l^{-}}^{\circ} = 1.36 V, E_{C r^{3 +} / C r}^{\circ} = - 0.74 V E_{C r_{2} O_{7}^{2 -} / C r^{3 +}}^{\circ} = 1.33 V, E_{M n O_{4}^{-} / M n^{2 +}}^{\circ} = 1.51 V$ Among the following, the strongest reducing agent is

Discussion

989.	In which compound synergic effect is present that relieves the metal of excess negative charge
Answer» In which compound synergic effect is present that relieves the metal of excess negative charge

Discussion

990.	When strongly heated, orthoboric acid leaves a residue of:
Answer» When strongly heated, orthoboric acid leaves a residue of:

Discussion

991.	Among the following compounds, the decreasing order of reactivity towards electrophilic substitution is:
Answer» Among the following compounds, the decreasing order of reactivity towards electrophilic substitution is:

Discussion

992.	Butanal is an example of [MP PET 1991]
Answer» Butanal is an example of [MP PET 1991]

Discussion

993.	13Al27 is a stable isotope. 13Al29 is expected to disintegrate by :
Answer» $13^{A l^{27}}$ is a stable isotope. $13^{A l^{29}}$ is expected to disintegrate by :

Discussion

994.	Observe the given compound.Which of the following is best suited to synthesize the compound via an SN2 reaction?
Answer» Observe the given compound. Which of the following is best suited to synthesize the compound via an $S_{N} 2$ reaction?

Discussion

995.	In Figure I an air column of length l1, is entrapped by a column of Hg of length 8 cm. In Figure II length of same air column at the same temperature is l2. Then l1/l2 is?(1 atm = 76 cm of Hg)
Answer» In Figure I an air column of length $l_{1}$ , is entrapped by a column of $H g$ of length $8 cm$ . In Figure II length of same air column at the same temperature is $l_{2}$ . Then $l_{1} / l_{2}$ is? (1 atm = $76 cm of H g$ )

Discussion

996.	Which β- keto acid shown below will not undergo decarboxylation on heating with an acid?
Answer» Which $β$ - keto acid shown below will not undergo decarboxylation on heating with an acid?

Discussion

997.	The bond angle is the lowest in which of the following species?
Answer» The bond angle is the lowest in which of the following species?

Discussion

998.	Acatalyst is a substance which [NCERT 1981; CPMT 1996
Answer» A catalyst is a substance which [NCERT 1981; CPMT 1996

Discussion

999.	During the electrolysis of an electrolyte, the number of ions produced, is directly proportional to the [AFMC 2002]
Answer» During the electrolysis of an electrolyte, the number of ions produced, is directly proportional to the [AFMC 2002]

999.

During the electrolysis of an electrolyte, the number of ions produced, is directly proportional to the [AFMC 2002]

Answer»

During the electrolysis of an electrolyte, the number of ions produced, is directly proportional to the

[AFMC 2002]

Discussion

1000.	The ene-yne that produces a chiral compound upon treatment with Lindlar's catalyst is:
Answer» The ene-yne that produces a chiral compound upon treatment with Lindlar's catalyst is:

Discussion

Explore topic-wise InterviewSolutions in .

How many electrons should be added to the reactant to balance the atom whose oxidation number is changing?Cr2O2−7⟶Cr+36

What is the correct product of the following reaction?

Silver benzoate will react with bromine in acetone to form

According to Bronsted-Lowry concept, the relative strengths of the bases CH3COO−, OH− and Cl− are in the order:

The energy of an electron in the second and the third Bohr's orbits of a hydrogen atom is −5.42×10−12 erg and −2.41×10−12 erg respectively. Calculate the wavelength of the emitted radiation when the electron drops from the third to the second orbit.

For an equilibrium H2O(s)⇌H2O(l), which of the following statements is true?

1 mol of an ideal gas for which Cv=32R is heated reversibly at a constant pressure of 1 atm from 25 oC to 100 oC. The △H is:Given: R=1.987 cal

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:

Which will be the least stable resonating structure?

A waxy white solid is burnt in air (with an excess supply of air) in an extraordinarily exothermic reaction. The product of this reaction rapidly undergoes complete hydrolysis to yield an acid X. The acid X is:

Which of the following can be a possible contact angle with water for a colloidal particle?

What is the mass of silver deposited on the passage of 2 A current during the electrolysis of silver?Electrochemical equivalent of silver = 1.18×10−3 gm C−1

In the electrolytic cell, flow of electrons is fron:

An ester (X) on hydrolysis gives an acid 'A' and alcohol 'B'. The sodium salt of 'A' on electrolysis gives ethane. When 'B' is distilled with aqueous bleaching powder it forms chloroform. Therefore 'X' may be

Aniline is diazotized and the diazonium salt hydrolysed to yield phenol which is brominated to produce C6H2(Br3)OH. Calculate the mass of the final product obtained from 9.3 g of aniline if the yield in the two steps is 45% and 70% (Atomic mass of Br = 80) ?

A 140 W heater was placed in 2.00 kg of methanol (CH3OH) and turned on for exactly 2 min. The temperature increased by 4.24 K. Assuming that all the heat is absorbed by methanol, then molar heat capacity of methanol is

The correct order of atomic radii among the following elements is:

2H3C−COOAgI2−−−→CCl4P(an ester)+CO2+AgIWhich of the following reactions will also give the same product P?

Nylon is an example of

Which of the following molecule(s) gives only acid(s) or acidic species on hydrolysis?

A gas contained in a cylinder fitted with a frictionless piston expands against a constant pressure 1 atmosphere from a volume of 4 litre to a volume of 14 litre. In doing so, it absorbs 800 J thermal energy from surrounding . Determine △U for the process.

A certain laser transition emits 6.37×1015 quanta sec−1m−2. Calculate the power output in J sec−1 m−2.Given: λ=632.8 nm

What will be the molarity of a solution containing 5 g of sodium hydroxide in 250 ml solution:

Chlorine is in +1 oxidation state in

Which of the following is a high spin complex?

Polarization is an important phenomenon which is helpful in determination of covalent nature of compound. With the help of Fajan's rule one can easily predict the nature of compound.Which of the following halide possess the highest covalent character?

Identify the correct labels of A,B and C in the following graph from the options given below:Root mean square speed (urms); most probable speed (ump); Average speed (uav)

Propose structures for hydrocarbons that give the following products on oxidative cleavage by KMnO4 or O3:

(CH3COO)2Pb+Ca(OH)2→A+(CH3COO)2CaA+CaOCl2→B+CaCl2+H2OIdentify A and B.

The number of atoms in face-centered cubic and hexagonal unit cells respectively are ?

On moving across a period, the atomic size decreases and nuclear charge increases and therefore the force of attraction exerted by the nucleus on the electron in the outermost shell increases.Potassium forms K+ ion but it does not form K2+ because of;

A redox reaction is:

The vapour pressure of pure benzene and toluene are 160 and 60 torr respectively. The molefraction of toluene in vapour phase in contact with equimolar solution of benzene and toluene is

Nitrogen has the electronic configuration 1s2,2s2 2p1x 2p1y 2p1z and not 1s2,2s2 2p2x 2p1y 2p0z which is determined by

Of the five isomeric hexanes, the isomer which can give two monochlorinated compounds is

GivenE∘Cl2/Cl−=1.36 V,E∘Cr3+/Cr=−0.74VE∘Cr2O2−7/Cr3+=1.33V,E∘MnO−4/Mn2+=1.51VAmong the following, the strongest reducing agent is

In which compound synergic effect is present that relieves the metal of excess negative charge

When strongly heated, orthoboric acid leaves a residue of:

Among the following compounds, the decreasing order of reactivity towards electrophilic substitution is:

Butanal is an example of [MP PET 1991]

13Al27 is a stable isotope. 13Al29 is expected to disintegrate by :

Observe the given compound.Which of the following is best suited to synthesize the compound via an SN2 reaction?

In Figure I an air column of length l1, is entrapped by a column of Hg of length 8 cm. In Figure II length of same air column at the same temperature is l2. Then l1/l2 is?(1 atm = 76 cm of Hg)

Which β- keto acid shown below will not undergo decarboxylation on heating with an acid?

The bond angle is the lowest in which of the following species?

Acatalyst is a substance which [NCERT 1981; CPMT 1996

During the electrolysis of an electrolyte, the number of ions produced, is directly proportional to the [AFMC 2002]

The ene-yne that produces a chiral compound upon treatment with Lindlar's catalyst is: