2600 + Interview Questions in Chemistry Page 6 InterviewSolution

251.	The hybridization of carbons labelled 3, 4 and 5 inHC1−C2−C3H=C4=C5H−C6H=C7H2 are?
Answer» The hybridization of carbons labelled 3, 4 and 5 in $H C^{1} - C^{2} - C^{3} H = C^{4} = C^{5} H - C^{6} H = C^{7} H_{2}$ are?

251.

The hybridization of carbons labelled 3, 4 and 5 inHC1−C2−C3H=C4=C5H−C6H=C7H2 are?

Answer»

The hybridization of carbons labelled 3, 4 and 5 in

$H C^{1} - C^{2} - C^{3} H = C^{4} = C^{5} H - C^{6} H = C^{7} H_{2}$ are?

252.	Arrange the following hydrides in increasing acidic strength.
Answer» Arrange the following hydrides in increasing acidic strength.

Discussion

253.	Blood red coloured solution is produced when ferric chloride solution is treated with:
Answer» Blood red coloured solution is produced when ferric chloride solution is treated with:

Discussion

254.	The substituents R1 and R2 for nine peptides are listed in the table given below. How many of these peptides are positively charged at Ph = 7.0? ___
Answer» The substituents R₁ and R₂ for nine peptides are listed in the table given below. How many of these peptides are positively charged at Ph = 7.0? ___

Discussion

255.	It is a general principle that the lower the energy a system contains, it is
Answer» It is a general principle that the lower the energy a system contains, it is

Discussion

256.	The mole fraction of methanol in water is 0.12. Calculate its molality.
Answer» The mole fraction of methanol in water is $0.12$ . Calculate its molality.

Discussion

257.	Autoprotolysis constant of NH3 is
Answer» Autoprotolysis constant of $N H_{3}$ is

Discussion

258.	N2O5 decomposes according to the equation, N2O5(g)→2NO2(g)+12O2(g)This is a first order reaction. A closed container has N2O5 and Ne gases at a total pressure of 333.8 mm of Hg. Thirty minutes after N2O5 starts decomposing, the total pressure is found to be 384.5 mm Hg. On complete decomposition of N2O5, the total pressure is 684.5 mm Hg. What is rate constant of decomposition of N2O5?(Take ln(1.169) = 0.156)
Answer» $N_{2} O_{5}$ decomposes according to the equation, $N_{2} O_{5} (g) \to 2 N O_{2} (g) + \frac{1}{2} O_{2} (g)$ This is a first order reaction. A closed container has $N_{2} O_{5}$ and $N e$ gases at a total pressure of 333.8 mm of Hg. Thirty minutes after $N_{2} O_{5}$ starts decomposing, the total pressure is found to be 384.5 mm Hg. On complete decomposition of $N_{2} O_{5},$ the total pressure is 684.5 mm Hg. What is rate constant of decomposition of $N_{2} O_{5}$ ? (Take ln(1.169) = 0.156)

Discussion

259.	The mass of an atom of C is
Answer» The mass of an atom of C is

Discussion

260.	Which of the following method is used to prepare pure aliphatic primary amine
Answer» Which of the following method is used to prepare pure aliphatic primary amine

Discussion

261.	The equilibrium constant for the reaction given below is 2.0×10−7 at 300 K. PCl5(g)⇌PCl3(g)+Cl2(g). The value of \|S∘\| is −x J mol−1 K−1. Calculate the value of x if ΔH∘=28.4 kJ mol−1 (Give your answer upto one deimal only)
Answer» The equilibrium constant for the reaction given below is $2.0 \times 10^{- 7} a t 300 K$ . $P C l_{5} (g) ⇌ P C l_{3} (g) + C l_{2} (g)$ . The value of $\| S^{\circ} \|$ is $- x J m o l^{- 1} K^{- 1}$ . Calculate the value of $x$ if $Δ H^{\circ} = 28.4 k J m o l^{- 1}$ (Give your answer upto one deimal only)

261.

The equilibrium constant for the reaction given below is 2.0×10−7 at 300 K. PCl5(g)⇌PCl3(g)+Cl2(g). The value of |S∘| is −x J mol−1 K−1. Calculate the value of x if ΔH∘=28.4 kJ mol−1 (Give your answer upto one deimal only)

Answer»

The equilibrium constant for the reaction given below is $2.0 \times 10^{- 7} a t 300 K$ .

$P C l_{5} (g) ⇌ P C l_{3} (g) + C l_{2} (g)$ . The value of $| S^{\circ} |$ is $- x J m o l^{- 1} K^{- 1}$ . Calculate the value of $x$ if $Δ H^{\circ} = 28.4 k J m o l^{- 1}$ (Give your answer upto one deimal only)

Discussion

262.	The structure of Fe2Cl6 is best represented as
Answer» The structure of $F e_{2} C l_{6}$ is best represented as

Discussion

263.	Which of the following option(s) is/are correct regarding ionic compounds?
Answer» Which of the following option(s) is/are correct regarding ionic compounds?

Discussion

264.	Suppose we carry out the reaction of Iodine on ethylene in presence of UV light such that the obtained product is symmetrical. Which of the following options are accurate?
Answer» Suppose we carry out the reaction of Iodine on ethylene in presence of UV light such that the obtained product is symmetrical. Which of the following options are accurate?

Discussion

265.	The structure of D-(+)-glucose is The structure of L-(-)-glucose is (IIT-JEE-2015, Advanced)
Answer» The structure of D-(+)-glucose is The structure of L-(-)-glucose is (IIT-JEE-2015, Advanced)

Discussion

266.	The freezing point of a solution containing 50 cm3 of ethylene glycol in 50 g of water is found to be −34∘C. Assuming ideal behavior, calculate the density of ethylene glycol (Kfforwater=1.86Kkgmol−1).
Answer» The freezing point of a solution containing 50 cm3 of ethylene glycol in 50 g of water is found to be $- 34^{\circ} C$ . Assuming ideal behavior, calculate the density of ethylene glycol $(K_{f} f o r w a t e r = 1.86 K k g m o l^{-} 1)$ .

Discussion

267.	Which of the following will produce white ppt on treatment with BaCl2 solution
Answer» Which of the following will produce white ppt on treatment with $B a C l_{2}$ solution

Discussion

268.	Which of the following reactants is suitable for preparation of methane and ethane by using one step only?
Answer» Which of the following reactants is suitable for preparation of methane and ethane by using one step only?

Discussion

269.	The value of the energy for the first excited state of hydrogen atom is .
Answer» The value of the energy for the first excited state of hydrogen atom is .

Discussion

270.	The element having very high ionization enthalpy but zero electron gain enthalpy is
Answer» The element having very high ionization enthalpy but zero electron gain enthalpy is

Discussion

271.	Approximate atomic mass of an element is 26.89. If its equivalent mass is 8.9, the exact atomic mass of the element is:
Answer» Approximate atomic mass of an element is 26.89. If its equivalent mass is 8.9, the exact atomic mass of the element is:

Discussion

272.	Electronic configuration of Fe3+ ion is
Answer» Electronic configuration of $F e^{3 +}$ ion is

Discussion

273.	Which of the following is known as carborundum?
Answer» Which of the following is known as carborundum?

Discussion

274.	The vapours of phosphine gas at 27∘C and 3 bar pressure has a density of:
Answer» The vapours of phosphine gas at $27^{\circ} C$ and 3 bar pressure has a density of:

Discussion

275.	For the given reaction :C2H4+Cl2→C2H4Cl2 △H=−270.6 kJmol−1 △S=−139 JK−1mol−1 Find △G in kJ/mol if T=300K?
Answer» For the given reaction : $C_{2} H_{4} + C l_{2} \to C_{2} H_{4} C l_{2}$ $△ H = - 270.6 k J m o l^{- 1} △ S = - 139 J K^{- 1} m o l^{- 1}$ Find $△ G$ in $k J / m o l$ if $T = 300 K$ ?

Discussion

276.	For an endothermic reaction, energy of activation is Ea and enthalpy of reaction is ΔH (both of these in kJ/mol). Minimum value of Ea will be:
Answer» For an endothermic reaction, energy of activation is $E_{a}$ and enthalpy of reaction is $Δ H$ (both of these in kJ/mol). Minimum value of $E_{a}$ will be:

Discussion

277.	A certain source of radiation emits 8×1015 quanta sec−1. Calculate the power output in J sec−1.Given: λ=840 nm
Answer» A certain source of radiation emits $8 \times 10^{15} {quanta sec}^{- 1}$ . Calculate the power output in ${J sec}^{- 1}$ . Given: $λ = 840 nm$

Discussion

278.	In the reaction:C6H5CHO+C6H5NH2→[A]Ni/H2−−−−→Δ[B]The product [B] is:
Answer» In the reaction: $C_{6} H_{5} C H O + C_{6} H_{5} N H_{2} \to [A] N i / H_{2} - --- \to Δ [B]$ The product [B] is:

Discussion

279.	Which of the following compound is non aromatic:
Answer» Which of the following compound is non aromatic:

Discussion

280.	Calculate the wavelength in Angstroms of the photon that is emitted when an electron in the Bohr orbit, n = 2 returns to the orbit, n = 1 in the hydrogen atom. The ionization potential of the ground state hydrogen atom is 2.17×10−11 erg per atom.
Answer» Calculate the wavelength in Angstroms of the photon that is emitted when an electron in the Bohr orbit, n = 2 returns to the orbit, n = 1 in the hydrogen atom. The ionization potential of the ground state hydrogen atom is $2.17 \times 10^{- 11}$ erg per atom.

Discussion

281.	From the reactions shown, A and B respectively are:
Answer» From the reactions shown, A and B respectively are:

Discussion

282.	In Bragg’s equation n λ = 2 d sinθ, ‘n’ represents
Answer» In Bragg’s equation n λ = 2 d sinθ, ‘n’ represents

Discussion

283.	Consider the following sequence of reactions:Major product [B] of the given reaction would be:
Answer» Consider the following sequence of reactions: Major product [B] of the given reaction would be:

Discussion

284.	Hydrogen diffuses 6 times faster than gas X. The molecular mass for X will be___.
Answer» Hydrogen diffuses 6 times faster than gas X. The molecular mass for X will be___.

Discussion

285.	Arrange CsF, RbF, NaF, KF, and LiF in the decreasing order of lattice energy:
Answer» Arrange $C s F, R b F, N a F, K F,$ and $L i F$ in the decreasing order of lattice energy:

Discussion

286.	The dipole moment is the highest for?
Answer» The dipole moment is the highest for?

286.

The dipole moment is the highest for?

Answer»

The dipole moment is the highest for?

Discussion

287.	Standard enthalpy of combustion of CH4 is −890 kJ mol−1 and standard enthalpy of vaporisation of water is 40.5 kJ mol−1. Calculate the enthalpy change for the reaction :CH4(g)+2O2(g)→CO2(g)+2H2O(g)
Answer» Standard enthalpy of combustion of $C H_{4}$ is $- 890 k J m o l^{- 1}$ and standard enthalpy of vaporisation of water is 40.5 kJ $m o l^{- 1}$ . Calculate the enthalpy change for the reaction : $C H_{4 (g)} + 2 O_{2 (g)} \to C O_{2 (g)} + 2 H_{2} O_{(g)}$

Discussion

288.	Which are true about p-type of semiconductor?
Answer» Which are true about p-type of semiconductor?

Discussion

289.	Which of the following is responsible for polluting water?
Answer» Which of the following is responsible for polluting water?

Discussion

290.	In the reaction sequence2 CH3CHOOH⊖−−−→A△−→B; the product B is:
Answer» In the reaction sequence $2 C H_{3} C H O O H^{⊖} - -- \to A △ - \to B;$ the product B is:

Discussion

291.	Which of the following molecules has a non-polar covalent bond?
Answer» Which of the following molecules has a non-polar covalent bond?

Discussion

292.	An organic compound A upon reacting with NH3 gives B. On heating B gives C. C in presence of KOH reacts with Br2 to give CH3CH2NH2. Then A is:
Answer» An organic compound A upon reacting with $N H_{3}$ gives B. On heating B gives C. C in presence of $K O H$ reacts with $B r_{2}$ to give $C H_{3} C H_{2} N H_{2}$ . Then A is:

Discussion

293.	Two half reactions for the following equation are: 4H2SO4+K2Cr2O7+3Na2SO3⟶Cr2(SO4)3+K2SO4+3Na2SO4+4H2O
Answer» Two half reactions for the following equation are: $4 H_{2} S O_{4} + K_{2} C r_{2} O_{7} + 3 N a_{2} S O_{3} ⟶ C r_{2} (S O_{4})_{3} + K_{2} S O_{4} + 3 N a_{2} S O_{4} + 4 H_{2} O$

Discussion

294.	Which of the following is not an antacid?
Answer» Which of the following is not an antacid?

Discussion

295.	Calculate the oxidation number of Iodine (I) in KI3 ?
Answer» Calculate the oxidation number of Iodine $(I)$ in $K I_{3}$ ?

Discussion

296.	A hydrocarbon contains 17.2% of hydrogen and has a relative molecular mass of 58. Its molecular formula is:(Given: Atomic masses of: C = 12 g, H = 1 g)
Answer» A hydrocarbon contains 17.2% of hydrogen and has a relative molecular mass of 58. Its molecular formula is: (Given: Atomic masses of: C = 12 g, H = 1 g)

Discussion

297.	Which of the following set has all coloured ions
Answer» Which of the following set has all coloured ions

Discussion

298.	An inorganic compound (A) is a strong reducing agent. Its hydrolysis in water gives a white turbidity (B). Aqueous solution of (A) gives a white precipitate (C) with NaOH solution which is soluble in excess of NaOH. (A) reduces auric chloride to produce purple of cassius. (A) also reduces iodine and gives chromyl chloride test. What is 'B' in the chemical reactions.
Answer» An inorganic compound (A) is a strong reducing agent. Its hydrolysis in water gives a white turbidity (B). Aqueous solution of (A) gives a white precipitate (C) with NaOH solution which is soluble in excess of NaOH. (A) reduces auric chloride to produce purple of cassius. (A) also reduces iodine and gives chromyl chloride test. What is 'B' in the chemical reactions.

Discussion

299.	The most basic among these hydroxides, is
Answer» The most basic among these hydroxides, is

299.

The most basic among these hydroxides, is

Answer»

The most basic among these hydroxides, is

Discussion

300.	The pH of a solution is enhanced from 2 to 3. The concentration of H+ in the new solution
Answer» The pH of a solution is enhanced from 2 to 3. The concentration of H⁺ in the new solution

Discussion

Explore topic-wise InterviewSolutions in .

The hybridization of carbons labelled 3, 4 and 5 inHC1−C2−C3H=C4=C5H−C6H=C7H2 are?

Arrange the following hydrides in increasing acidic strength.

Blood red coloured solution is produced when ferric chloride solution is treated with:

The substituents R1 and R2 for nine peptides are listed in the table given below. How many of these peptides are positively charged at Ph = 7.0? ___

It is a general principle that the lower the energy a system contains, it is

The mole fraction of methanol in water is 0.12. Calculate its molality.

Autoprotolysis constant of NH3 is

The mass of an atom of C is

Which of the following method is used to prepare pure aliphatic primary amine

The equilibrium constant for the reaction given below is 2.0×10−7 at 300 K. PCl5(g)⇌PCl3(g)+Cl2(g). The value of |S∘| is −x J mol−1 K−1. Calculate the value of x if ΔH∘=28.4 kJ mol−1 (Give your answer upto one deimal only)

The structure of Fe2Cl6 is best represented as

Which of the following option(s) is/are correct regarding ionic compounds?

Suppose we carry out the reaction of Iodine on ethylene in presence of UV light such that the obtained product is symmetrical. Which of the following options are accurate?

The structure of D-(+)-glucose is The structure of L-(-)-glucose is (IIT-JEE-2015, Advanced)

The freezing point of a solution containing 50 cm3 of ethylene glycol in 50 g of water is found to be −34∘C. Assuming ideal behavior, calculate the density of ethylene glycol (Kfforwater=1.86Kkgmol−1).

Which of the following will produce white ppt on treatment with BaCl2 solution

Which of the following reactants is suitable for preparation of methane and ethane by using one step only?

The value of the energy for the first excited state of hydrogen atom is .

The element having very high ionization enthalpy but zero electron gain enthalpy is

Approximate atomic mass of an element is 26.89. If its equivalent mass is 8.9, the exact atomic mass of the element is:

Electronic configuration of Fe3+ ion is

Which of the following is known as carborundum?

The vapours of phosphine gas at 27∘C and 3 bar pressure has a density of:

For the given reaction :C2H4+Cl2→C2H4Cl2 △H=−270.6 kJmol−1 △S=−139 JK−1mol−1 Find △G in kJ/mol if T=300K?

For an endothermic reaction, energy of activation is Ea and enthalpy of reaction is ΔH (both of these in kJ/mol). Minimum value of Ea will be:

A certain source of radiation emits 8×1015 quanta sec−1. Calculate the power output in J sec−1.Given: λ=840 nm

In the reaction:C6H5CHO+C6H5NH2→[A]Ni/H2−−−−→Δ[B]The product [B] is:

Which of the following compound is non aromatic:

Calculate the wavelength in Angstroms of the photon that is emitted when an electron in the Bohr orbit, n = 2 returns to the orbit, n = 1 in the hydrogen atom. The ionization potential of the ground state hydrogen atom is 2.17×10−11 erg per atom.

From the reactions shown, A and B respectively are:

In Bragg’s equation n λ = 2 d sinθ, ‘n’ represents

Consider the following sequence of reactions:Major product [B] of the given reaction would be:

Hydrogen diffuses 6 times faster than gas X. The molecular mass for X will be___.

Arrange CsF, RbF, NaF, KF, and LiF in the decreasing order of lattice energy:

The dipole moment is the highest for?

Standard enthalpy of combustion of CH4 is −890 kJ mol−1 and standard enthalpy of vaporisation of water is 40.5 kJ mol−1. Calculate the enthalpy change for the reaction :CH4(g)+2O2(g)→CO2(g)+2H2O(g)

Which are true about p-type of semiconductor?

Which of the following is responsible for polluting water?

In the reaction sequence2 CH3CHOOH⊖−−−→A△−→B; the product B is:

Which of the following molecules has a non-polar covalent bond?

An organic compound A upon reacting with NH3 gives B. On heating B gives C. C in presence of KOH reacts with Br2 to give CH3CH2NH2. Then A is:

Two half reactions for the following equation are: 4H2SO4+K2Cr2O7+3Na2SO3⟶Cr2(SO4)3+K2SO4+3Na2SO4+4H2O

Which of the following is not an antacid?

Calculate the oxidation number of Iodine (I) in KI3 ?

A hydrocarbon contains 17.2% of hydrogen and has a relative molecular mass of 58. Its molecular formula is:(Given: Atomic masses of: C = 12 g, H = 1 g)

Which of the following set has all coloured ions

The most basic among these hydroxides, is

The pH of a solution is enhanced from 2 to 3. The concentration of H+ in the new solution