46295 + Interview Questions in Chemistry

1.	The Bronsted acids in the reversible reaction are: HCO−3(aq.)+OH−(aq.)→CO23(aq.)+H2O
Answer» The Bronsted acids in the reversible reaction are: $H C O_{3}^{-} (a q .) + O H^{-} (a q .) \to C O_{3}^{2} (a q .) + H_{2} O$

Discussion

2.	Among NH3+ ,primary , secondary and tertiary which group shows maximum -I effect
Answer» Among NH3+ ,primary , secondary and tertiary which group shows maximum -I effect

Discussion

3.	If the bond energies of H−H, Br−Br and H−Br are 433, 192 and 364 kJmol−1 respectively, the ΔH∘ for the reaction: H2(g)+Br2(g)→2HBr(g) is:
Answer» If the bond energies of $H - H$ , $B r - B r$ and $H - B r$ are $433$ , $192$ and $364 k J m o l^{- 1}$ respectively, the $Δ H^{\circ}$ for the reaction: $H_{2} (g) + B r_{2} (g) \to 2 H B r (g)$ is:

Discussion

4.	The amines formed when (I) and (II) undergo Hofmann rearrangement are:
Answer» The amines formed when (I) and (II) undergo Hofmann rearrangement are:

Discussion

5.	Calculate the percentage purity of a sample of bleaching powder from the following data: 14.3 g of a sample of bleaching powder when treated with acetic acid and excess of KI, liberated iodine which required 100 mL 1 M sodium thiosulphate solution: Ca(OCl)2+2CH3COOH→Ca(CH3COO)2+H2O+Cl2 Cl2+2KI→2KCl+I2 2Na2S2O3+I2→Na2S4O6+2NaI
Answer» Calculate the percentage purity of a sample of bleaching powder from the following data: 14.3 g of a sample of bleaching powder when treated with acetic acid and excess of KI, liberated iodine which required 100 mL 1 M sodium thiosulphate solution: $C a (O C l)_{2} + 2 C H_{3} C O O H \to C a (C H_{3} C O O)_{2} + H_{2} O + C l_{2}$ $C l_{2} + 2 K I \to 2 K C l + I_{2}$ $2 N a_{2} S_{2} O_{3} + I_{2} \to N a_{2} S_{4} O_{6} + 2 N a I$

Discussion

6.	Given the reaction between 2 gases represented by A2 and B2 to give the compound AB(g). A2(g)+B2(g)⇌2AB(g) At equilibrium, the concentration of: A2=3.0×10−3 M B2=4.2×10−3 M AB=2.8×10−3 M If the reaction takes place in a sealed vessel at 527 ∘C, then the value of Kc will be:
Answer» Given the reaction between $2$ gases represented by $A_{2}$ and $B_{2}$ to give the compound $A B (g)$ . $A_{2} (g) + B_{2} (g) ⇌ 2 A B (g)$ At equilibrium, the concentration of: $A_{2} = 3.0 \times 10^{- 3} M$ $B_{2} = 4.2 \times 10^{- 3} M$ $A B = 2.8 \times 10^{- 3} M$ If the reaction takes place in a sealed vessel at $527^{\circ} C$ , then the value of $K_{c}$ will be:

Discussion

7.	"the number of elements in a period is equal to the no. of necessary electrons to acquire ns2np6 configuration in the outermost shell of the first element (alkali metal) of the period." ------please explain this line, it was written in my jee cengage book I found difficulty to understand above language. hope you will solve it
Answer» "the number of elements in a period is equal to the no. of necessary electrons to acquire ns2np6 configuration in the outermost shell of the first element (alkali metal) of the period." ------please explain this line, it was written in my jee cengage book I found difficulty to understand above language. hope you will solve it

Discussion

8.	What are R group ?
Answer» What are R group ?

Discussion

9.	what is the relative charge of proton and electron?In ncert it is given as 1 and -1 respectively how it came as this value (since 1.6*10^-19 is elementary charge).please explain tomorrow exam
Answer» what is the relative charge of proton and electron?In ncert it is given as 1 and -1 respectively how it came as this value (since 1.6*10^-19 is elementary charge).please explain tomorrow exam

Discussion

10.	I would like to know the important topics which I should prepare which are most likely to come in my chemistry hsc boards exam of boards??
Answer» I would like to know the important topics which I should prepare which are most likely to come in my chemistry hsc boards exam of boards??

Discussion

11.	Look at the table given below and fill in the blanks with correct word(s). [3 MARKS] PropertiesAcidBaseRed Litmus(i)_____Turns to blueTasteSour(ii)_____Extract of red cabbage(iii)_____Turns to greenish color
Answer» Look at the table given below and fill in the blanks with correct word(s). [3 MARKS] $\begin{matrix} Properties & Acid & Base Red Litmus & (i)_____ & Turns to blue Taste & Sour & (ii)_____Extract of red cabbage & (iii)_____ & Turns to greenish color \end{matrix}$

11.

Look at the table given below and fill in the blanks with correct word(s). [3 MARKS] PropertiesAcidBaseRed Litmus(i)___Turns to blueTasteSour(ii)_Extract of red cabbage(iii)___Turns to greenish color

Answer»

Look at the table given below and fill in the blanks with correct word(s). [3 MARKS]

$\begin{matrix} Properties & Acid & Base Red Litmus & (i)_____ & Turns to blue Taste & Sour & (ii)_____Extract of red cabbage & (iii)_____ & Turns to greenish color \end{matrix}$

Discussion

12.	Match structres given in Column I with the type of detergents given in Column II. Column~IColumn~IIA. CH3(CH2)16COO(CH2CH2O)n,CH2CH2OH1. Cationic detergentB. C17H35COO−Na+2. Anionic detergentC. CH3−(CH2)10CH2SO−3Na+3. Nonionic detergentD. ⎡⎢⎢⎣CH3−(CH2)15−CH3\|N\|CH3−CH3⎤⎥⎥⎦+Br−4. Soap
Answer» Match structres given in Column I with the type of detergents given in Column II. $\begin{matrix} Column~I & Column~II A. C H_{3} (C H_{2})_{16} C O O (C H_{2} C H_{2} O)_{n}, C H_{2} C H_{2} O H & 1. Cationic detergent B. C_{17} H_{35} C O O^{-} N a^{+} & 2. Anionic detergent C. C H_{3} - (C H_{2})_{10} C H_{2} S O_{3}^{-} N a^{+} & 3. Nonionic detergent D. {⎡ ⎢⎢ ⎣ C H_{3} - (C H_{2})_{15} - C H_{3} \| N \| C H_{3} - C H_{3} ⎤ ⎥⎥ ⎦}_{3}^{+} B r^{-} & 4. Soap \end{matrix}$

Discussion

13.	When chlorine passed through propene at 400 degree Celsius, the product is:
Answer» When chlorine passed through propene at 400 degree Celsius, the product is:

Discussion

14.	MSO4NH4OH−−−−−→↓XwhiteNH4OH−−−−−→excessYH2S−−→↓Z. Here M and Z are:
Answer» $M S O_{4} N H_{4} O H - ---- \to ↓ X w h i t e N H_{4} O H - ---- \to e x c e s s Y H_{2} S - - \to ↓ Z .$ Here M and Z are:

Discussion

15.	Which of the following group of elements are not regarded as transition elements?
Answer» Which of the following group of elements are not regarded as transition elements?

Discussion

16.	Which of the following amine will form stable diazonium salt at 273-283 K ?
Answer» Which of the following amine will form stable diazonium salt at 273-283 K ?

Discussion

17.	A solution when diluted with H2O and boiled, it gives a white precipitate. On addition of excess NH4Cl/NH4OH , the volume of precipitate decreases leaving behind a white gelatinous preciptitate. Identify the precipitate which dissolves in NH4OH/NH4Cl
Answer» A solution when diluted with $H_{2} O$ and boiled, it gives a white precipitate. On addition of excess $N H_{4} C l / N H_{4} O H$ , the volume of precipitate decreases leaving behind a white gelatinous preciptitate. Identify the precipitate which dissolves in $N H_{4} O H / N H_{4} C l$

Discussion

18.	Number of nitrogen atoms present in 1.4 g of N2:
Answer» Number of nitrogen atoms present in 1.4 g of N₂:

Discussion

19.	The colour developed by the addition of few drops of methyl orange to aqueous solution of sodium acetate
Answer» The colour developed by the addition of few drops of methyl orange to aqueous solution of sodium acetate

Discussion

20.	If the shortest wave - length of a spectral line in Lyman series for He+ is 'x', then what will be the largest wave length of a spectral line in Balmer series of Li2+
Answer» If the shortest wave - length of a spectral line in Lyman series for $H e^{+}$ is 'x', then what will be the largest wave length of a spectral line in Balmer series of $L i^{2 +}$

Discussion

21.	Which one is least ionic in the following compounds
Answer» Which one is least ionic in the following compounds

21.

Which one is least ionic in the following compounds

Answer»

Which one is least ionic in the following compounds

Discussion

22.	Which of the following sets of reactions cannot give a carboxylic acid as the final product?
Answer» Which of the following sets of reactions cannot give a carboxylic acid as the final product?

Discussion

23.	The number of resonance structures for ‘N’ is ___
Answer» The number of resonance structures for ‘N’ is ___

23.

The number of resonance structures for ‘N’ is ___

Answer»

The number of resonance structures for ‘N’ is ___

Discussion

24.	XeF2 involves hybridisation
Answer» $X e F_{2}$ involves hybridisation

Discussion

25.	A sample of hardwater contains 1.1 mg CaCl2 and 0.95 mg MgCl2 per litre. Calculate the hardness of water in terms of CaCO3 present in per 106 parts of water.
Answer» A sample of hardwater contains 1.1 mg $C a C l_{2}$ and 0.95 mg $M g C l_{2}$ per litre. Calculate the hardness of water in terms of $C a C O_{3}$ present in per $10^{6}$ parts of water.

Discussion

26.	Among the fluorides below, the ore which does not exists is
Answer» Among the fluorides below, the ore which does not exists is

Discussion

27.	50 mL of 1 M HCl, 100 mL of 0.5 M HNO3, and x mL of 5 M H2SO4 are mixed together and the total volume is made upto 1.0 L with water. 100 mL of this solution exactly neutralises 10 mL of M/3 Al2(CO3)3. Calculate the value of x:___
Answer» 50 mL of 1 M HCl, 100 mL of 0.5 M $H N O_{3},$ and x mL of 5 M $H_{2} S O_{4}$ are mixed together and the total volume is made upto 1.0 L with water. 100 mL of this solution exactly neutralises 10 mL of M/3 $A l_{2} (C O_{3})_{3} .$ Calculate the value of x:___

Discussion

28.	Even more than beauty, intellect attracts me with _______ appeal.
Answer» Even more than beauty, intellect attracts me with _______ appeal.

Discussion

29.	Which of the following forms a pair of equivalent rational numbers?
Answer» Which of the following forms a pair of equivalent rational numbers?

Discussion

30.	Arrange the following compounds in their decreasing order of boiling points: I. C9H20 II. C8H18 III.(CH3)2C−(CH2)4−CH3 IV. CH3−CH3\|C\|CH3−CH3\|C\|CH3−CH3
Answer» Arrange the following compounds in their decreasing order of boiling points: $I . C_{9} H_{20} I I . C_{8} H_{18}$ $I I I . (C H_{3})_{2} C - (C H_{2})_{4} - C H_{3}$ $I V . C H_{3} - C H_{3} \| C \| C H_{3} - C H_{3} \| C \| C H_{3} - C H_{3}$

Discussion

31.	The atomic weight of two elements A and B are 30 and 60 respectively. If x gram of A contains z atoms, how many atoms are present in 2x g of B?
Answer» The atomic weight of two elements A and B are 30 and 60 respectively. If x gram of A contains z atoms, how many atoms are present in 2x g of B?

Discussion

32.	Considering the elements B,Al,Mg and K, the correct order of their metallic character is:
Answer» Considering the elements $B, A l, M g$ and $K$ , the correct order of their metallic character is:

Discussion

33.	In the isoelectronic series of metal carbonyl, The CO bond strength is expected to increase in the order:
Answer» In the isoelectronic series of metal carbonyl, The CO bond strength is expected to increase in the order:

Discussion

34.	The correct decreasing order of priority for functional groups of organic chemistry in the IUPAC nomenclature system is:
Answer» The correct decreasing order of priority for functional groups of organic chemistry in the IUPAC nomenclature system is:

Discussion

35.	Bromine reacts with hot and concentrated Na2CO3 to produce:
Answer» Bromine reacts with hot and concentrated $N a_{2} C O_{3}$ to produce:

Discussion

36.	Ethyl alcohol is industrially prepared from ethylene by
Answer» Ethyl alcohol is industrially prepared from ethylene by

Discussion

37.	Which of the following is condensation reaction?
Answer» Which of the following is condensation reaction?

Discussion

38.	Cyclohexanolconc. H2SO4−−−−−−−→Δ(A)NBS−−−→(B)LiAlD4−−−−→(C) Product (C) is:
Answer» $Cyclohexanol conc. H_{2} S O_{4} - ------ \to Δ (A) N B S - -- \to (B) L i A l D_{4} - --- \to (C)$ Product (C) is:

Discussion

39.	A solution of two substances A and B was formed (mole fractions are xA & xB). It was found that the mole fraction of A in vapour phase (yA) was twice of xA. This is only possible if
Answer» A solution of two substances A and B was formed (mole fractions are $x_{A}$ & $x_{B}$ ). It was found that the mole fraction of A in vapour phase ( $y_{A}$ ) was twice of $x_{A}$ . This is only possible if

Discussion

40.	Ksp of Cu(OH)2 is 5 ×10−16 at 25∘C, then pH of a saturated solution of Cu(OH)2 is___
Answer» $K_{s p}$ of $C u (O H)_{2}$ is 5 $\times 10^{- 16}$ at $25^{\circ} C$ , then pH of a saturated solution of $C u (O H)_{2}$ is___

Discussion

41.	The molar conductivity of a 0.5mol/dm3 solution of AgNO3 with electrolytic conductivity of 5.76×10−3S cm−1 at 298 K is
Answer» The molar conductivity of a $0.5 m o l / d m^{3}$ solution of $A g N O_{3}$ with electrolytic conductivity of $5.76 \times 10^{- 3} S c m^{- 1}$ at 298 K is

Discussion

42.	For which of the following set of quantum numbers will an electron have the highest energy?
Answer» For which of the following set of quantum numbers will an electron have the highest energy?

Discussion

43.	Kp=0.04 atm at 899 K for the equilibrium shown below. What is the equilibrium concentration of C2H6 when it is placed in a flask at 4.0 atm pressure and allowed to come to equilibrium? C2H6(g)↔C2H4(g)+H2(g)
Answer» $K_{p} = 0.04$ atm at 899 K for the equilibrium shown below. What is the equilibrium concentration of $C_{2} H_{6}$ when it is placed in a flask at 4.0 atm pressure and allowed to come to equilibrium? $C_{2} H_{6} (g) \leftrightarrow C_{2} H_{4} (g) + H_{2} (g)$

Discussion

44.	The activity of a radioactive nuclide (X100) is 6.023 curie at a certain time ‘t′. If its disintegration constant is 3.7×104s−1 the mass of X after t sec is:
Answer» The activity of a radioactive nuclide $(X^{100})$ is $6.023$ curie at a certain time $‘ t^{'}$ . If its disintegration constant is $3.7 \times 10^{4} s^{- 1}$ the mass of $X$ after t sec is:

Discussion

45.	What is crystal field splitting energy? How does the magnitude of Δ0 decide the actual configuration of d-orbitals in a coordination entity?
Answer» What is crystal field splitting energy? How does the magnitude of $Δ_{0}$ decide the actual configuration of d-orbitals in a coordination entity?

Discussion

46.	In the following structures, which two forms are straggered conformations of ethane
Answer» In the following structures, which two forms are straggered conformations of ethane

46.

In the following structures, which two forms are straggered conformations of ethane

Answer»

In the following structures, which two forms are straggered conformations of ethane

Discussion

47.	Can you give me the place where I can find the videos of following topics because in Byju no video is given: Alternating Axis of symmetry Condition for Enantiomeric Meso and Racemic Difference between d and l and D and L D and L Configuration Descriptors Properties of Optical Isomers Erythro and Threo Designation Stereochemistry of C compounds not containg Allenes Optical Activity of t-Amines and t-Carbanion Racemic Mixture Resolution of Racemic Mixture Regioselective and Regioselective reactions You can also send me URL of video to my E-mail anmolnpavgmail.com
Answer» Can you give me the place where I can find the videos of following topics because in Byju no video is given: Alternating Axis of symmetry Condition for Enantiomeric Meso and Racemic Difference between d and l and D and L D and L Configuration Descriptors Properties of Optical Isomers Erythro and Threo Designation Stereochemistry of C compounds not containg Allenes Optical Activity of t-Amines and t-Carbanion Racemic Mixture Resolution of Racemic Mixture Regioselective and Regioselective reactions You can also send me URL of video to my E-mail anmolnpavgmail.com

47.

Can you give me the place where I can find the videos of following topics because in Byju no video is given: Alternating Axis of symmetry Condition for Enantiomeric Meso and Racemic Difference between d and l and D and L D and L Configuration Descriptors Properties of Optical Isomers Erythro and Threo Designation Stereochemistry of C compounds not containg Allenes Optical Activity of t-Amines and t-Carbanion Racemic Mixture Resolution of Racemic Mixture Regioselective and Regioselective reactions You can also send me URL of video to my E-mail anmolnpavgmail.com

Answer»

Can you give me the place where I can find the videos of following topics because in Byju no video is given:

Alternating Axis of symmetry

Condition for Enantiomeric

Meso and Racemic

Difference between d and l and D and L

D and L Configuration Descriptors

Properties of Optical Isomers

Erythro and Threo Designation

Stereochemistry of C compounds not containg Allenes

Optical Activity of t-Amines and t-Carbanion

Racemic Mixture

Resolution of Racemic Mixture

Regioselective and Regioselective reactions

You can also send me URL of video to my E-mail anmolnpavgmail.com

Discussion

48.	Account for the following: (i) Primary amines (R−NH2) have higher boiling point than tertiary amines (R3N). (ii) Aniline does not undergo Friedel - Crafts reaction. (iii) (CH3)2NH is more basic than (CH3)3N in an aqueous solution.
Answer» Account for the following: (i) Primary amines $(R - N H_{2})$ have higher boiling point than tertiary amines $(R_{3} N)$ . (ii) Aniline does not undergo Friedel - Crafts reaction. (iii) $(C H_{3})_{2} N H$ is more basic than $(C H_{3})_{3} N$ in an aqueous solution.

Discussion

49.	Which of the following groups does not exhibit +M effect when attached with benzene?
Answer» Which of the following groups does not exhibit +M effect when attached with benzene?

Discussion

50.	What is scattering of light by mist on head light of vehicles called?
Answer» What is scattering of light by mist on head light of vehicles called?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The Bronsted acids in the reversible reaction are: HCO−3(aq.)+OH−(aq.)→CO23(aq.)+H2O

Among NH3+ ,primary , secondary and tertiary which group shows maximum -I effect

If the bond energies of H−H, Br−Br and H−Br are 433, 192 and 364 kJmol−1 respectively, the ΔH∘ for the reaction: H2(g)+Br2(g)→2HBr(g) is:

The amines formed when (I) and (II) undergo Hofmann rearrangement are:

Given the reaction between 2 gases represented by A2 and B2 to give the compound AB(g). A2(g)+B2(g)⇌2AB(g) At equilibrium, the concentration of: A2=3.0×10−3 M B2=4.2×10−3 M AB=2.8×10−3 M If the reaction takes place in a sealed vessel at 527 ∘C, then the value of Kc will be:

What are R group ?

what is the relative charge of proton and electron?In ncert it is given as 1 and -1 respectively how it came as this value (since 1.6*10^-19 is elementary charge).please explain tomorrow exam

I would like to know the important topics which I should prepare which are most likely to come in my chemistry hsc boards exam of boards??

Look at the table given below and fill in the blanks with correct word(s). [3 MARKS] PropertiesAcidBaseRed Litmus(i)_____Turns to blueTasteSour(ii)_____Extract of red cabbage(iii)_____Turns to greenish color

When chlorine passed through propene at 400 degree Celsius, the product is:

MSO4NH4OH−−−−−→↓XwhiteNH4OH−−−−−→excessYH2S−−→↓Z. Here M and Z are:

Which of the following group of elements are not regarded as transition elements?

Which of the following amine will form stable diazonium salt at 273-283 K ?

A solution when diluted with H2O and boiled, it gives a white precipitate. On addition of excess NH4Cl/NH4OH , the volume of precipitate decreases leaving behind a white gelatinous preciptitate. Identify the precipitate which dissolves in NH4OH/NH4Cl

Number of nitrogen atoms present in 1.4 g of N2:

The colour developed by the addition of few drops of methyl orange to aqueous solution of sodium acetate

If the shortest wave - length of a spectral line in Lyman series for He+ is 'x', then what will be the largest wave length of a spectral line in Balmer series of Li2+

Which one is least ionic in the following compounds

Which of the following sets of reactions cannot give a carboxylic acid as the final product?

The number of resonance structures for ‘N’ is ___

XeF2 involves hybridisation

A sample of hardwater contains 1.1 mg CaCl2 and 0.95 mg MgCl2 per litre. Calculate the hardness of water in terms of CaCO3 present in per 106 parts of water.

Among the fluorides below, the ore which does not exists is

50 mL of 1 M HCl, 100 mL of 0.5 M HNO3, and x mL of 5 M H2SO4 are mixed together and the total volume is made upto 1.0 L with water. 100 mL of this solution exactly neutralises 10 mL of M/3 Al2(CO3)3. Calculate the value of x:___

Even more than beauty, intellect attracts me with _______ appeal.

Which of the following forms a pair of equivalent rational numbers?

Arrange the following compounds in their decreasing order of boiling points: I. C9H20 II. C8H18 III.(CH3)2C−(CH2)4−CH3 IV. CH3−CH3|C|CH3−CH3|C|CH3−CH3

The atomic weight of two elements A and B are 30 and 60 respectively. If x gram of A contains z atoms, how many atoms are present in 2x g of B?

Considering the elements B,Al,Mg and K, the correct order of their metallic character is:

In the isoelectronic series of metal carbonyl, The CO bond strength is expected to increase in the order:

The correct decreasing order of priority for functional groups of organic chemistry in the IUPAC nomenclature system is:

Bromine reacts with hot and concentrated Na2CO3 to produce:

Ethyl alcohol is industrially prepared from ethylene by

Which of the following is condensation reaction?

Cyclohexanolconc. H2SO4−−−−−−−→Δ(A)NBS−−−→(B)LiAlD4−−−−→(C) Product (C) is:

A solution of two substances A and B was formed (mole fractions are xA &amp; xB). It was found that the mole fraction of A in vapour phase (yA) was twice of xA. This is only possible if

Ksp of Cu(OH)2 is 5 ×10−16 at 25∘C, then pH of a saturated solution of Cu(OH)2 is___

The molar conductivity of a 0.5mol/dm3 solution of AgNO3 with electrolytic conductivity of 5.76×10−3S cm−1 at 298 K is

For which of the following set of quantum numbers will an electron have the highest energy?

Kp=0.04 atm at 899 K for the equilibrium shown below. What is the equilibrium concentration of C2H6 when it is placed in a flask at 4.0 atm pressure and allowed to come to equilibrium? C2H6(g)↔C2H4(g)+H2(g)

The activity of a radioactive nuclide (X100) is 6.023 curie at a certain time ‘t′. If its disintegration constant is 3.7×104s−1 the mass of X after t sec is:

What is crystal field splitting energy? How does the magnitude of Δ0 decide the actual configuration of d-orbitals in a coordination entity?

In the following structures, which two forms are straggered conformations of ethane

Account for the following: (i) Primary amines (R−NH2) have higher boiling point than tertiary amines (R3N). (ii) Aniline does not undergo Friedel - Crafts reaction. (iii) (CH3)2NH is more basic than (CH3)3N in an aqueous solution.

Which of the following groups does not exhibit +M effect when attached with benzene?

What is scattering of light by mist on head light of vehicles called?

Look at the table given below and fill in the blanks with correct word(s). [3 MARKS] PropertiesAcidBaseRed Litmus(i)___Turns to blueTasteSour(ii)_Extract of red cabbage(iii)___Turns to greenish color

A solution of two substances A and B was formed (mole fractions are xA & xB). It was found that the mole fraction of A in vapour phase (yA) was twice of xA. This is only possible if