46295 + Interview Questions in Chemistry

1.	What is the difference between law of chemical equivalence and stoichiometry? As in when do we apply law of equivalence and when stoichiometry?
Answer» What is the difference between law of chemical equivalence and stoichiometry? As in when do we apply law of equivalence and when stoichiometry?

Discussion

2.	What is Dry pressure, wet pressure and aqueous tension?
Answer» What is Dry pressure, wet pressure and aqueous tension?

Discussion

3.	Consider a 70% efficient hydrogen-oxygen fuel cell working under standard conditions at 1 bar and 298 K. Its cell reaction isH2(g)+12O2(g)→H2O(l)The work derived from the cell on the consumption of 1.0×10−3 mol of H2(g) is used to compress 1.00 mol of a monoatomic ideal gas in a thermally insulated container. What is the change in the temperature (in K) of the ideal gas?The standard reduction potentials for the two half-cells are given below.O2(g)+4H+(aq)+4e−→2H2O(l), Eo=1.23 V2H+(aq)+2e−→H2(g),Eo=0.00 VUse F=96500 C mol−1, R=8.314 J mol−1 K−1
Answer» Consider a $70 %$ efficient hydrogen-oxygen fuel cell working under standard conditions at $1 bar$ and $298 K$ . Its cell reaction is $H_{2} (g) + \frac{1}{2} O_{2} (g) \to H_{2} O (l)$ The work derived from the cell on the consumption of $1.0 \times 10^{- 3} mol$ of $H_{2} (g)$ is used to compress $1.00 mol$ of a monoatomic ideal gas in a thermally insulated container. What is the change in the temperature (in K) of the ideal gas?The standard reduction potentials for the two half-cells are given below. $O_{2} (g) + 4 H^{+} (a q) + 4 e^{-} \to 2 H_{2} O (l), E^{o} = 1.23 V 2 H^{+} (a q) + 2 e^{-} \to H_{2} (g), E^{o} = 0.00 V$ Use $F = 96500 C m o l^{- 1}, R = 8.314 J m o l^{- 1} K^{- 1}$

3.

Consider a 70% efficient hydrogen-oxygen fuel cell working under standard conditions at 1 bar and 298 K. Its cell reaction isH2(g)+12O2(g)→H2O(l)The work derived from the cell on the consumption of 1.0×10−3 mol of H2(g) is used to compress 1.00 mol of a monoatomic ideal gas in a thermally insulated container. What is the change in the temperature (in K) of the ideal gas?The standard reduction potentials for the two half-cells are given below.O2(g)+4H+(aq)+4e−→2H2O(l), Eo=1.23 V2H+(aq)+2e−→H2(g),Eo=0.00 VUse F=96500 C mol−1, R=8.314 J mol−1 K−1

Answer»

Consider a $70 %$ efficient hydrogen-oxygen fuel cell working under standard conditions at $1 bar$ and $298 K$ . Its cell reaction is

$H_{2} (g) + \frac{1}{2} O_{2} (g) \to H_{2} O (l)$

The work derived from the cell on the consumption of $1.0 \times 10^{- 3} mol$ of $H_{2} (g)$ is used to compress $1.00 mol$ of a monoatomic ideal gas in a thermally insulated container. What is the change in the temperature (in K) of the ideal gas?The standard reduction potentials for the two half-cells are given below.

$O_{2} (g) + 4 H^{+} (a q) + 4 e^{-} \to 2 H_{2} O (l), E^{o} = 1.23 V 2 H^{+} (a q) + 2 e^{-} \to H_{2} (g), E^{o} = 0.00 V$

Use $F = 96500 C m o l^{- 1}, R = 8.314 J m o l^{- 1} K^{- 1}$

Discussion

4.	At 405 K, 70 ml of one mol of ammonia has dPdV=0, then which of the following options is not correct?
Answer» At 405 K, 70 ml of one mol of ammonia has $\frac{d P}{d V} = 0$ , then which of the following options is not correct?

Discussion

5.	The ratio of angular momentum of electron in 3rd orbit of He^+ ion to that of electron in 1st orbit of Li^++ ion is
Answer» The ratio of angular momentum of electron in 3rd orbit of He^+ ion to that of electron in 1st orbit of Li^++ ion is

Discussion

6.	45. Mole fraction of methanol is 4.5 what is molality in aqueous solution
Answer» 45. Mole fraction of methanol is 4.5 what is molality in aqueous solution

Discussion

7.	Which of the following is not isoelectronic series -
Answer» Which of the following is not isoelectronic series -

Discussion

8.	Question 49 Predict the shapes of the following molecules on the basis of hybridisation. BCl3, CH4, CO2, NH3
Answer» Question 49 Predict the shapes of the following molecules on the basis of hybridisation. $B C l_{3}, C H_{4}, C O_{2}, N H_{3}$

8.

Question 49 Predict the shapes of the following molecules on the basis of hybridisation. BCl3, CH4, CO2, NH3

Answer»

Question 49

Predict the shapes of the following molecules on the basis of hybridisation.

$B C l_{3}, C H_{4}, C O_{2}, N H_{3}$

Discussion

9.	321) In one mole NaCI crystal, 10-3 mole AlCI, is doped.The number of cationic vacancies present in NaCIwill be(1) 10-3N(3) 3 x 103 NA(2) 5 x 10-N(4) 210-3 N
Answer» 321) In one mole NaCI crystal, 10-3 mole AlCI, is doped.The number of cationic vacancies present in NaCIwill be(1) 10-3N(3) 3 x 103 NA(2) 5 x 10-N(4) 210-3 N

Discussion

10.	Arrange the following in increasing order of C--O bond length Na2CO3 CO CO+ CO2 1 2 3 4
Answer» Arrange the following in increasing order of C--O bond length Na2CO3 CO CO+ CO2 1 2 3 4

Discussion

11.	A hydrogenation reaction is carried out at 500 K. If the same reaction is carried out in the presence of a catalyst at the same rate, the temperature required is 400 K. Calculate the activation energy of the reaction, if the catalyst lowers the activation energy by 20 kJ/mol (Assume Arrhenius factor to be same during the above temperature change)
Answer» A hydrogenation reaction is carried out at $500 K$ . If the same reaction is carried out in the presence of a catalyst at the same rate, the temperature required is $400 K$ . Calculate the activation energy of the reaction, if the catalyst lowers the activation energy by $20 kJ/mol$ (Assume Arrhenius factor to be same during the above temperature change)

Discussion

12.	During the adsorption of a gas on the surface of a solid, which of the following is true?
Answer» During the adsorption of a gas on the surface of a solid, which of the following is true?

Discussion

13.	30. it is known that protons and neutrons are themselves built of elementary units called quarks.The up quark u has charge +2e/3 and down quark d has charge -e/3.The composition of proton and neutron is
Answer» 30. it is known that protons and neutrons are themselves built of elementary units called quarks.The up quark u has charge +2e/3 and down quark d has charge -e/3.The composition of proton and neutron is

Discussion

14.	The correct structure of product A from the following reaction is:
Answer» The correct structure of product A from the following reaction is:

Discussion

15.	CaHCO3+CH3COOH----------- ?
Answer» CaHCO3+CH3COOH----------- ?

Discussion

16.	Covalency of aluminum is.
Answer» Covalency of aluminum is.

Discussion

17.	What will be the abnormal molecular mass of K3{Fe(CN)6} if in a aqueous solution it is 40% dissociated? Given molecular wt of this compound is 329
Answer» What will be the abnormal molecular mass of K3{Fe(CN)6} if in a aqueous solution it is 40% dissociated? Given molecular wt of this compound is 329

Discussion

18.	what happen if ethyl chloride undergoes wurtz reactio
Answer» what happen if ethyl chloride undergoes wurtz reactio

Discussion

19.	The order of decreasing nucleophilicity is
Answer» The order of decreasing nucleophilicity is

Discussion

20.	common Name and iupac nameof C_6H_6-CO-CH_2-CO-C_6H_6
Answer» common Name and iupac nameof C_6H_6-CO-CH_2-CO-C_6H_6

Discussion

21.	A substance X is a compound of s− block element, substance X gives a violet colour in flame test, X is :
Answer» A substance $X$ is a compound of $s -$ block element, substance $X$ gives a violet colour in flame test, $X$ is :

Discussion

22.	38.What is meant by group valence ?
Answer» 38.What is meant by group valence ?

Discussion

23.	what are the bravias lattice for triclinic?
Answer» what are the bravias lattice for triclinic?

Discussion

24.	1.nge the following in the increasing order of strength of ionic bond. NaF, MgF2, AlF3.
Answer» 1.nge the following in the increasing order of strength of ionic bond. NaF, MgF2, AlF3.

Discussion

25.	what is the ratio of weight of O2 and He, the mixture of which contains equal number of molecules of equal gas?
Answer» what is the ratio of weight of O2 and He, the mixture of which contains equal number of molecules of equal gas?

Discussion

26.	Whatis the state of hybridisation of carbon in (a) (b) diamond (c) graphite?
Answer» What is the state of hybridisation of carbon in (a) (b) diamond (c) graphite?

Discussion

27.	Which of the following ligands are correctly represented in a spectrochemical series?
Answer» Which of the following ligands are correctly represented in a spectrochemical series?

Discussion

28.	Silver acetate. The main product of this reaction is [Kurukshetra CET 2002]
Answer» Silver acetate. The main product of this reaction is [Kurukshetra CET 2002]

28.

Silver acetate. The main product of this reaction is [Kurukshetra CET 2002]

Answer»

Silver acetate. The main product of this reaction is

[Kurukshetra CET 2002]

Discussion

29.	Discuss and give chemical reaction of Lassaigne Test for 1. Nitrogen in the organic compound. 2. Nitrogen and Sulphur, both in the organic compound.
Answer» Discuss and give chemical reaction of Lassaigne Test for 1. Nitrogen in the organic compound. 2. Nitrogen and Sulphur, both in the organic compound.

29.

Discuss and give chemical reaction of Lassaigne Test for 1. Nitrogen in the organic compound. 2. Nitrogen and Sulphur, both in the organic compound.

Answer»

Discuss and give chemical reaction of Lassaigne Test for

1. Nitrogen in the organic compound.

2. Nitrogen and Sulphur, both in the organic compound.

Discussion

30.	Which has maximum covalent character? 1. NaCl 2.SiCl4 3.AlCl3 4.MgCl2 Isn't SiCl4 the answer? Because covalent character is inversely proportional to polarisation and polarisation is inversely proportional to size of the atom. Since out if these, Si is the largest in is have the least polarisation and thus will result in the highest covalent character. is this correct? If not, why not?
Answer» Which has maximum covalent character? 1. NaCl 2.SiCl4 3.AlCl3 4.MgCl2 Isn't SiCl4 the answer? Because covalent character is inversely proportional to polarisation and polarisation is inversely proportional to size of the atom. Since out if these, Si is the largest in is have the least polarisation and thus will result in the highest covalent character. is this correct? If not, why not?

Discussion

31.	The ionization enthalpy of Na+ formation from Na(g) is 495.8 kJ mol−1 while the electron gain enthalpy of Br is −325.0 kJ mol−1. Given the lattice enthalpy of NaBr is −728.4 kJ mol−1. The energy for the formation of NaBr ionic solid is (–) _____ ×10−1 kJ mol−1 .
Answer» The ionization enthalpy of $N a^{+}$ formation from $N a (g)$ is $495.8 k J m o l^{- 1}$ while the electron gain enthalpy of $B r$ is $- 325.0 k J m o l^{- 1}$ . Given the lattice enthalpy of $N a B r$ is $- 728.4 k J m o l^{- 1}$ . The energy for the formation of $N a B r$ ionic solid is (–) _____ $\times 10^{- 1} k J m o l^{- 1}$ .

Discussion

32.	Give the physical states of the following alkynes: a) Butyne (C_4H_6) b)\:Pentyne (C_5H_8) c)Dodecyne\:(C_{12}H_{22}) d)Tridecyne (C_{13}H_{24}) e)Tetradecyne (C_{14}H_{26}) f) Pentadecyne (C_{15}H_{28})
Answer» Give the physical states of the following alkynes: a) Butyne (C_4H_6) b)\:Pentyne (C_5H_8) c)Dodecyne\:(C_{12}H_{22}) d)Tridecyne (C_{13}H_{24}) e)Tetradecyne (C_{14}H_{26}) f) Pentadecyne (C_{15}H_{28})

Discussion

33.	What is the hybridization of interhalogen compounds of the type XX′5?
Answer» What is the hybridization of interhalogen compounds of the type $X X_{5}^{'}$ ?

Discussion

34.	Which of the following compounds is used as an antifreeze in automobile radiators?
Answer» Which of the following compounds is used as an antifreeze in automobile radiators?

Discussion

35.	Which of the following is the most stable radical among the following a)CH^°3 B)RCH^°2 c)R2CH^° D)R3C^°
Answer» Which of the following is the most stable radical among the following a)CH^°3 B)RCH^°2 c)R2CH^° D)R3C^°

Discussion

36.	H2 + I2 = 2HI In the above equilibrium system if the concentration of the reactants at 25∘C is increased, the value of KC will
Answer» $H_{2} + I_{2} = 2 H I$ In the above equilibrium system if the concentration of the reactants at $25^{\circ} C$ is increased, the value of $K_{C}$ will

36.

H2 + I2 = 2HI In the above equilibrium system if the concentration of the reactants at 25∘C is increased, the value of KC will

Answer»

$H_{2} + I_{2} = 2 H I$ In the above equilibrium system if the concentration of the

reactants at $25^{\circ} C$ is increased, the value of $K_{C}$ will

Discussion

37.	enthalpy of atomisation ?
Answer» enthalpy of atomisation ?

Discussion

38.	Which one of the following carbocation is most stable?
Answer» Which one of the following carbocation is most stable?

Discussion

39.	Considering x-axis as the internuclear axis which out of the following will not form a sigma bond and why? (a) 1s and 1s (b) 1s and 2px (c) 2py and 2py (d) 1s and 2s.
Answer» Considering x-axis as the internuclear axis which out of the following will not form a sigma bond and why? (a) 1s and 1s (b) 1s and 2p_x (c) 2p_y and 2p_y (d) 1s and 2s.

Discussion

40.	A base has kb=8.1×10^{-8} inwhat amount should 0.02 (m)HCland0.02(m)of BOH be mixed to make 200ml of a buffer of pH 7
Answer» A base has kb=8.1×10^{-8} inwhat amount should 0.02 (m)HCland0.02(m)of BOH be mixed to make 200ml of a buffer of pH 7

Discussion

41.	What role does the molecular interaction play in a solution of alcohol and water??
Answer» What role does the molecular interaction play in a solution of alcohol and water??

Discussion

42.	What will be the oxidation state of Carbon in baking soda i.e. NaHCO3
Answer» What will be the oxidation state of Carbon in baking soda i.e. $N a H C O_{3}$

Discussion

43.	In which of the following pπ - dπ bonding is possible
Answer» In which of the following p $π$ - d $π$ bonding is possible

Discussion

44.	What is the order of ionic mobility of halides?
Answer» What is the order of ionic mobility of halides?

Discussion

45.	what is electrochemical cells? what is galvanic cells? what are different between electrochemical cells and galvanic cells?
Answer» what is electrochemical cells? what is galvanic cells? what are different between electrochemical cells and galvanic cells?

45.

what is electrochemical cells? what is galvanic cells? what are different between electrochemical cells and galvanic cells?

Answer»

what is electrochemical cells?

what is galvanic cells?

what are different between electrochemical cells and galvanic cells?

Discussion

46.	In a FCC unit cell, atoms are numbered as shown below. The atoms not touching each other are: (Atom numbered 3 is face centre of front face)
Answer» In a FCC unit cell, atoms are numbered as shown below. The atoms not touching each other are: (Atom numbered $3$ is face centre of front face)

Discussion

47.	What is the pH of 10−7mol L−1 HCl solution at 25∘C?
Answer» What is the pH of $10^{- 7}$ mol $L^{- 1}$ HCl solution at $25^{\circ}$ C?

Discussion

48.	The electronic configurations of four elements are given below. Arrange these elements in the correct order of magnitudes (without sign) of their electron affinities: i. 2s22p5 ii. 3s23p5 iii. 2s22p4 iv. 3s23p4 Select the correct answer using the codes given below:
Answer» The electronic configurations of four elements are given below. Arrange these elements in the correct order of magnitudes (without sign) of their electron affinities: $i . 2 s^{2} 2 p^{5}$ $i i . 3 s^{2} 3 p^{5}$ $i i i . 2 s^{2} 2 p^{4}$ $i v . 3 s^{2} 3 p^{4}$ Select the correct answer using the codes given below:

Discussion

49.	the compund formed by raction of CH_2=CH-(CH_2)_2COOH with HBr in presence of peroxide
Answer» the compund formed by raction of CH_2=CH-(CH_2)_2COOH with HBr in presence of peroxide

Discussion

50.	In the ground state of atomic Fe (Z = 26), the spin-only magnetic moment is x×10−1 BM. The value of x is : (Round off to the Nearest Integer) [Given: √3 = 1.73, √2 = 1.41]
Answer» In the ground state of atomic Fe (Z = 26), the spin-only magnetic moment is $x \times 10^{- 1} B M$ . The value of x is : (Round off to the Nearest Integer) [Given: √3 = 1.73, √2 = 1.41]

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

What is the difference between law of chemical equivalence and stoichiometry? As in when do we apply law of equivalence and when stoichiometry?

What is Dry pressure, wet pressure and aqueous tension?

At 405 K, 70 ml of one mol of ammonia has dPdV=0, then which of the following options is not correct?

The ratio of angular momentum of electron in 3rd orbit of He^+ ion to that of electron in 1st orbit of Li^++ ion is

45. Mole fraction of methanol is 4.5 what is molality in aqueous solution

Which of the following is not isoelectronic series -

Question 49 Predict the shapes of the following molecules on the basis of hybridisation. BCl3, CH4, CO2, NH3

321) In one mole NaCI crystal, 10-3 mole AlCI, is doped.The number of cationic vacancies present in NaCIwill be(1) 10-3N(3) 3 x 103 NA(2) 5 x 10-N(4) 210-3 N

Arrange the following in increasing order of C--O bond length Na2CO3 CO CO+ CO2 1 2 3 4

During the adsorption of a gas on the surface of a solid, which of the following is true?

30. it is known that protons and neutrons are themselves built of elementary units called quarks.The up quark u has charge +2e/3 and down quark d has charge -e/3.The composition of proton and neutron is

The correct structure of product A from the following reaction is:

CaHCO3+CH3COOH----------- ?

Covalency of aluminum is.

What will be the abnormal molecular mass of K3{Fe(CN)6} if in a aqueous solution it is 40% dissociated? Given molecular wt of this compound is 329

what happen if ethyl chloride undergoes wurtz reactio

The order of decreasing nucleophilicity is

common Name and iupac nameof C_6H_6-CO-CH_2-CO-C_6H_6

A substance X is a compound of s− block element, substance X gives a violet colour in flame test, X is :

38.What is meant by group valence ?

what are the bravias lattice for triclinic?

1.nge the following in the increasing order of strength of ionic bond. NaF, MgF2, AlF3.

what is the ratio of weight of O2 and He, the mixture of which contains equal number of molecules of equal gas?

Whatis the state of hybridisation of carbon in (a) (b) diamond (c) graphite?

Which of the following ligands are correctly represented in a spectrochemical series?

Silver acetate. The main product of this reaction is [Kurukshetra CET 2002]

Discuss and give chemical reaction of Lassaigne Test for 1. Nitrogen in the organic compound. 2. Nitrogen and Sulphur, both in the organic compound.

The ionization enthalpy of Na+ formation from Na(g) is 495.8 kJ mol−1 while the electron gain enthalpy of Br is −325.0 kJ mol−1. Given the lattice enthalpy of NaBr is −728.4 kJ mol−1. The energy for the formation of NaBr ionic solid is (–) _____ ×10−1 kJ mol−1 .

Give the physical states of the following alkynes: a) Butyne (C_4H_6) b)\:Pentyne (C_5H_8) c)Dodecyne\:(C_{12}H_{22}) d)Tridecyne (C_{13}H_{24}) e)Tetradecyne (C_{14}H_{26}) f) Pentadecyne (C_{15}H_{28})

What is the hybridization of interhalogen compounds of the type XX′5?

Which of the following compounds is used as an antifreeze in automobile radiators?

Which of the following is the most stable radical among the following a)CH^°3 B)RCH^°2 c)R2CH^° D)R3C^°

H2 + I2 = 2HI In the above equilibrium system if the concentration of the reactants at 25∘C is increased, the value of KC will

enthalpy of atomisation ?

Which one of the following carbocation is most stable?

Considering x-axis as the internuclear axis which out of the following will not form a sigma bond and why? (a) 1s and 1s (b) 1s and 2px (c) 2py and 2py (d) 1s and 2s.

A base has kb=8.1×10^{-8} inwhat amount should 0.02 (m)HCland0.02(m)of BOH be mixed to make 200ml of a buffer of pH 7

What role does the molecular interaction play in a solution of alcohol and water??

What will be the oxidation state of Carbon in baking soda i.e. NaHCO3

In which of the following pπ - dπ bonding is possible

What is the order of ionic mobility of halides?

what is electrochemical cells? what is galvanic cells? what are different between electrochemical cells and galvanic cells?

In a FCC unit cell, atoms are numbered as shown below. The atoms not touching each other are: (Atom numbered 3 is face centre of front face)

What is the pH of 10−7mol L−1 HCl solution at 25∘C?

The electronic configurations of four elements are given below. Arrange these elements in the correct order of magnitudes (without sign) of their electron affinities: i. 2s22p5 ii. 3s23p5 iii. 2s22p4 iv. 3s23p4 Select the correct answer using the codes given below:

the compund formed by raction of CH_2=CH-(CH_2)_2COOH with HBr in presence of peroxide

In the ground state of atomic Fe (Z = 26), the spin-only magnetic moment is x×10−1 BM. The value of x is : (Round off to the Nearest Integer) [Given: √3 = 1.73, √2 = 1.41]