46295 + Interview Questions in Chemistry

1.	29. Which element has lowest electron affinity?g(1) O(2) S(3) Se(4) Te
Answer» 29. Which element has lowest electron affinity?g(1) O(2) S(3) Se(4) Te

Discussion

2.	BaCl2.2H2O which bond present?
Answer» BaCl2.2H2O which bond present?

Discussion

3.	A neon-dioxgen mixture contains 70.6g dioxygen and 167.5neon.If pressure of the mixture of gases in cylinder is 25bar.What is the partial pressure of dioxygen and neon in th mixture
Answer» A neon-dioxgen mixture contains 70.6g dioxygen and 167.5neon.If pressure of the mixture of gases in cylinder is 25bar.What is the partial pressure of dioxygen and neon in th mixture

Discussion

4.	Q 18/30 For the coagulation of 40 ml of ferric hydroxide sol, 10 ml of0.4 M KCI is required. Then, the coagulation value of KCI is
Answer» Q 18/30 For the coagulation of 40 ml of ferric hydroxide sol, 10 ml of0.4 M KCI is required. Then, the coagulation value of KCI is

Discussion

5.	बाज़ार किसी का लिंग, जाति, धर्म या क्षेत्र नहीं देखता; वह देखता है सिर्फ़ उसकी क्रय शक्ति को। इस रूप में वह एक प्रकार से सामाजिक समता की भी रचना कर रहा है। आप इससे कहाँ तक सहमत हैं?
Answer» बाज़ार किसी का लिंग, जाति, धर्म या क्षेत्र नहीं देखता; वह देखता है सिर्फ़ उसकी क्रय शक्ति को। इस रूप में वह एक प्रकार से सामाजिक समता की भी रचना कर रहा है। आप इससे कहाँ तक सहमत हैं?

Discussion

6.	The oxidation state which is exhibited by boron is:
Answer» The oxidation state which is exhibited by boron is:

Discussion

7.	Which of the following having higher boiling point 1 propanal Acetone EthanolPropane
Answer» Which of the following having higher boiling point 1 propanal Acetone Ethanol Propane

Discussion

8.	Draw resonating structures and resonance hybrid of CO2.
Answer» Draw resonating structures and resonance hybrid of CO2.

Discussion

9.	Which of the following is incorrect about the Enthalpy of a compound? a. Enthalpy is a measure of energy in a thermodynamic system . b. The unit of measurement for enthalpy in the International System of Units(SI) is the joule . c. Enthalpy change is the amount of heat evolved or absorbed in a reaction carried out at constant pressure. d. It also includes the internal energy, which is the energy required to create a system.
Answer» Which of the following is incorrect about the Enthalpy of a compound? a. Enthalpy is a measure of energy in a thermodynamic system . b. The unit of measurement for enthalpy in the International System of Units(SI) is the joule . c. Enthalpy change is the amount of heat evolved or absorbed in a reaction carried out at constant pressure. d. It also includes the internal energy, which is the energy required to create a system.

9.

Which of the following is incorrect about the Enthalpy of a compound? a. Enthalpy is a measure of energy in a thermodynamic system . b. The unit of measurement for enthalpy in the International System of Units(SI) is the joule . c. Enthalpy change is the amount of heat evolved or absorbed in a reaction carried out at constant pressure. d. It also includes the internal energy, which is the energy required to create a system.

Answer»

Which of the following is incorrect about the Enthalpy of a compound?

a. Enthalpy is a measure of energy in a thermodynamic system .

b. The unit of measurement for enthalpy in the International System of Units(SI) is the joule .

c. Enthalpy change is the amount of heat evolved or absorbed in a reaction carried out at constant pressure.

d. It also includes the internal energy, which is the energy required to create a system.

Discussion

10.	An organic compound A has only H, C and O. Compound A give red solid on reaction with 2, 4 D.N.P reagent. A react with OH−/Δ to give B as one of productThen most probable structure of A can be
Answer» An organic compound A has only H, C and O. Compound A give red solid on reaction with 2, 4 D.N.P reagent. A react with $O H^{-} / Δ$ to give B as one of product Then most probable structure of A can be

Discussion

11.	A solution has 0.05 M Mg2+ and 0.05 M NH3. Calculate the concentration of NH4Cl required to prevent the formation of Mg(OH)2 in this solution. Ksp of Mg(OH)2=9.0×10−12 and ionization constant of NH3=1.8×10−5 (Given, √1.8=1.34)
Answer» A solution has $0.05 M M g^{2 +}$ and $0.05 M N H_{3}$ . Calculate the concentration of $N H_{4} C l$ required to prevent the formation of $M g (O H)_{2}$ in this solution. $K_{s p} of M g (O H)_{2} = 9.0 \times 10^{- 12}$ and ionization constant of $N H_{3} = 1.8 \times 10^{- 5}$ (Given, $\sqrt{1.8} = 1.34$ )

Discussion

12.	give the differences between orbit,orbital,shell,subshell
Answer» give the differences between orbit,orbital,shell,subshell

Discussion

13.	Given, C(graphites)+O2(g)→CO2(g) Δr H∘=−393.5 kJ mol−1 H2(g)+12 O2(g)→H2O(l); ΔrH∘=−285.8 kJ mol−2 CO2(g+2H2O(l)→CH4(g)+2O2(g) ΔrH∘=+890.3 kJ mol−1 Based on the above thermochemical equations, the value of Δr H∘ at 298K for the reaction, C(graphite)+2H2(g)→CH4(g) will be
Answer» Given, $C_{(g r a p h i t e s)} + O_{2} (g) \to C O_{2} (g)$ $Δ_{r} H^{\circ} = - 393.5 k J m o l^{- 1}$ $H_{2} (g) + \frac{1}{2} O_{2} (g) \to H_{2} O (l);$ $Δ_{r} H^{\circ} = - 285.8 k J m o l^{- 2}$ $C O_{2} (g + 2 H_{2} O (l) \to C H_{4} (g) + 2 O_{2} (g)$ $Δ_{r} H^{\circ} = + 890.3 k J m o l^{- 1}$ Based on the above thermochemical equations, the value of $Δ_{r} H^{\circ}$ at 298K for the reaction, $C_{(g r a p h i t e)} + 2 H_{2} (g) \to C H_{4} (g)$ will be

Discussion

14.	15. From the following values of H and S decide whether these reactions will be spontaneous or non-spontaneous at 298 K. Reaction (i); H = –10.5 × 103 J mol–1 S = +31 J K–1 mol–1 Reaction (ii); H = –11.7 × 103 J mol–1 S = –105 J K–1 mol–1
Answer» 15. From the following values of H and S decide whether these reactions will be spontaneous or non-spontaneous at 298 K. Reaction (i); H = –10.5 × 103 J mol–1 S = +31 J K–1 mol–1 Reaction (ii); H = –11.7 × 103 J mol–1 S = –105 J K–1 mol–1

Discussion

15.	Certain substance emits only the wavelengths λ1, λ2, λ3 and λ4 when it is at a high temperature. When this substance is at a colder temperature, it will absorb only the following wavelengths
Answer» Certain substance emits only the wavelengths $λ_{1}, λ_{2}, λ_{3} a n d λ_{4}$ when it is at a high temperature. When this substance is at a colder temperature, it will absorb only the following wavelengths

Discussion

16.	Is demineralised or distilled water useful for drinking purposes? If not, how can it be made useful?
Answer» Is demineralised or distilled water useful for drinking purposes? If not, how can it be made useful?

Discussion

17.	In a SN2 substitution reaction of the type:R−Br+Cl−DMF−−−→R−Cl+Br−which one of the following has the highest relative rate?
Answer» In a $S_{N} 2$ substitution reaction of the type: $R - B r + C l^{-} D M F - -- \to R - C l + B r^{-}$ which one of the following has the highest relative rate?

Discussion

18.	35. which of the following has the same number ds-electrons as the d-electrons in Fe2+?(2) Ca(4) P(3) N(1)li
Answer» 35. which of the following has the same number ds-electrons as the d-electrons in Fe2+?(2) Ca(4) P(3) N(1)li

Discussion

19.	The vapour pressure of water at 80∘C is 355 mm of Hg. The total pressure of a 1 L vessel containing O2 saturated with water at 80∘C is 760 mm of Hg. The contents of the vessel are pumped into a 0.3 L vessel at the same temperature. What is the partial pressure of O2?
Answer» The vapour pressure of water at $80^{\circ} C$ is $355 mm$ of $H g$ . The total pressure of a $1 L$ vessel containing $O_{2}$ saturated with water at $80^{\circ} C$ is $760 mm$ of $H g$ . The contents of the vessel are pumped into a $0.3 L$ vessel at the same temperature. What is the partial pressure of $O_{2}$ ?

Discussion

20.	Metal reacts with acid to produce hydrogen gas. But when metal reacts with HNO3 hydrogen gas is not given out. Give a reason.
Answer» Metal reacts with acid to produce hydrogen gas. But when metal reacts with $H N O_{3}$ hydrogen gas is not given out. Give a reason.

Discussion

21.	16 Explain primary valence.
Answer» 16 Explain primary valence.

Discussion

22.	What is the difference between matter-wave and electromagnetic wave?
Answer» What is the difference between matter-wave and electromagnetic wave?

Discussion

23.	In Milikan's oil drop experiment, which of the following charges can exist on an oil drop? Charge on electron e = −1.6×10−19 C
Answer» In Milikan's oil drop experiment, which of the following charges can exist on an oil drop? Charge on electron e = $- 1.6 \times 10^{- 19} C$

Discussion

24.	If it is asked to write rate law expression for hydrolysis of ester , should i consider it 1st or 2nd order ?
Answer» If it is asked to write rate law expression for hydrolysis of ester , should i consider it 1st or 2nd order ?

Discussion

25.	24. Delta Hf C2H4 = 12.5 kcal Heat of atomization of c =171 kcal Bond energy of H2=104.3 kcal Bond energy of C-H =99.3 kcal What is C=C bond energy
Answer» 24. Delta Hf C2H4 = 12.5 kcal Heat of atomization of c =171 kcal Bond energy of H2=104.3 kcal Bond energy of C-H =99.3 kcal What is C=C bond energy

Discussion

26.	A gaseous hydrocarbongives upon combustion 0.72 g. of water and 3.08 g. of CO2. Theempirical formula of the hydrocarbon is:
Answer» A gaseous hydrocarbon gives upon combustion 0.72 g. of water and 3.08 g. of CO₂. The empirical formula of the hydrocarbon is:

Discussion

27.	Difference b/w abscission and senescence ??
Answer» Difference b/w abscission and senescence ??

Discussion

28.	Induced charge q can never be greater than inducing charge Q
Answer» Induced charge q can never be greater than inducing charge Q

Discussion

29.	29. How to find reactivity of benzene compounds towards electrophilic substitution ?
Answer» 29. How to find reactivity of benzene compounds towards electrophilic substitution ?

Discussion

30.	10 mL of 1 N HCl ,25 ml of 2 N H_{2 }SO_4 and 40ml of X N HNO_3 are mixed and made up to 2000 ml .100ml of this solution required 30 ml of NaOH taken from a solution containing 4 g of NaOH in 250 ml of solution . What is the value of X
Answer» 10 mL of 1 N HCl ,25 ml of 2 N H_{2 }SO_4 and 40ml of X N HNO_3 are mixed and made up to 2000 ml .100ml of this solution required 30 ml of NaOH taken from a solution containing 4 g of NaOH in 250 ml of solution . What is the value of X

Discussion

31.	A gas is enclosed in a cylinder with a movable frictionless piston. Its initial thermodynamic state at pressure Pi=105 Pa and volume Vi=10−3 Pa changes to a final state at Pf=(132)×105 Pa and Vf=8×10−3 m3 in an adiabatic quasi-static process, such that P3V5= constant. Consider another thermodynamic process that brings the system from the same initial state to the same final state in two steps : an isobaric expansion at Pi followed by an isochoric (isovolumetric) process at volume Vf. The amount of heat supplied to the system in the two-step process is approximately
Answer» A gas is enclosed in a cylinder with a movable frictionless piston. Its initial thermodynamic state at pressure $P_{i} = 10^{5} P a$ and volume $V_{i} = 10^{- 3} P a$ changes to a final state at $P_{f} = (\frac{1}{32}) \times 10^{5} P a$ and $V_{f} = 8 \times 10^{- 3} m^{3}$ in an adiabatic quasi-static process, such that $P^{3} V^{5} =$ constant. Consider another thermodynamic process that brings the system from the same initial state to the same final state in two steps : an isobaric expansion at $P_{i}$ followed by an isochoric (isovolumetric) process at volume $V_{f}$ . The amount of heat supplied to the system in the two-step process is approximately

Discussion

32.	For the given Wedge-Dash Notation of a compound.Which of the following represents the correct Fischer Projection of the same compound ?
Answer» For the given Wedge-Dash Notation of a compound. Which of the following represents the correct Fischer Projection of the same compound ?

Discussion

33.	If the radius of Mg2+ is 6.5 pm and O−2 is 14 pm, then calculate the coordination number of Mg2+ in the crystal of MgO.
Answer» If the radius of $M g^{2 +}$ is $6.5 p m$ and $O_{2}^{-}$ is $14 p m$ , then calculate the coordination number of $M g^{2 +}$ in the crystal of $M g O$ .

Discussion

34.	V verus T curves at constant pressures P1 and P2 for an idealgas are shown in the figure,
Answer» V verus T curves at constant pressures $P_{1}$ and $P_{2}$ for an idealgas are shown in the figure,

34.

V verus T curves at constant pressures P1 and P2 for an idealgas are shown in the figure,

Answer»

V verus T curves at constant pressures $P_{1}$ and $P_{2}$ for an idealgas are shown in the figure,

Discussion

35.	How to bascity of any compound
Answer» How to bascity of any compound

Discussion

36.	how does electron microscope works
Answer» how does electron microscope works

Discussion

37.	4. Consider the reaction at 300 K H2 (g) + Cl2 (g) = 2HCl (g) , heat of enthalpy = -185 KJ If 3 mole of H2 completely reacts with 3 mol of Cl2 to form HCl, change in internal energy of the reaction will be 1) Zero 2) -185 KJ 3) 555 KJ 4) None of these
Answer» 4. Consider the reaction at 300 K H2 (g) + Cl2 (g) = 2HCl (g) , heat of enthalpy = -185 KJ If 3 mole of H2 completely reacts with 3 mol of Cl2 to form HCl, change in internal energy of the reaction will be 1) Zero 2) -185 KJ 3) 555 KJ 4) None of these

Discussion

38.	A gas expands from a volume of 3.0 dm3 to 5.0 dm3 against a constant pressure of 3.0 atm the work done during expansion is used to heat 10.0 mole of water of temperature 290.0 K Calculate the final temperature of water (specific heat of water =4.184 JK−1g−1)
Answer» A gas expands from a volume of $3.0 d m^{3}$ to $5.0 d m^{3}$ against a constant pressure of $3.0 a t m$ the work done during expansion is used to heat $10.0$ mole of water of temperature $290.0 K$ Calculate the final temperature of water (specific heat of water $= 4.184 J K^{- 1} g^{- 1}$ )

Discussion

39.	Sulphur forms the chlorides S2Cl2 and SCl2. The equivalent mass of sulphur in SCL2 is
Answer» Sulphur forms the chlorides S2Cl2 and SCl2. The equivalent mass of sulphur in SCL2 is

Discussion

40.	How many nodal planes are possible for 3d orbital?
Answer» How many nodal planes are possible for 3d orbital?

Discussion

41.	Zn2+(aq)+2e→Zn(s). This is
Answer» $Z n^{2 +} (a q) + 2 e \to Z n (s)$ . This is

Discussion

42.	Rank the following substituent groups in order of decreasing priority according to the Cahn-Ingold-Prelog system: -CH(CH3)2 -CH2Br -CH2CH2Br (a) 2> 3> 1 (b)1>3>2 (c)3>1>2 (d) 2>1>3
Answer» Rank the following substituent groups in order of decreasing priority according to the Cahn-Ingold-Prelog system: -CH(CH3)2 -CH2Br -CH2CH2Br (a) 2> 3> 1 (b)1>3>2 (c)3>1>2 (d) 2>1>3

Discussion

43.	For the reaction 1/8 S8 +3/2 O2 --> SO3 , the difference of heat change at constant pressure and constant constant volume at 27 degree Celsius will be
Answer» For the reaction 1/8 S8 +3/2 O2 --> SO3 , the difference of heat change at constant pressure and constant constant volume at 27 degree Celsius will be

Discussion

44.	A diatomic molecule has dipole moment of 1.2 D. If the bond distance is 1.0 ∘A, what fraction of charge e exists on each atom?
Answer» A diatomic molecule has dipole moment of 1.2 D. If the bond distance is $1.0 \circ A$ , what fraction of charge e exists on each atom?

Discussion

45.	H2O2 can be obtained when following reacts with H2SO4 expect with
Answer» $H_{2} O_{2}$ can be obtained when following reacts with $H_{2} S O_{4}$ expect with

Discussion

46.	Number of monohydric phenols possible with the molecular formula C7H8O
Answer» Number of monohydric phenols possible with the molecular formula C7H8O

Discussion

47.	In the reaction given below, expected product is/are
Answer» In the reaction given below, expected product is/are

Discussion

48.	The alkene which gives 4,4-dimethylpentan-2-one on reductive ozonolysis is
Answer» The alkene which gives 4,4-dimethylpentan-2-one on reductive ozonolysis is

Discussion

49.	The hydrolysis of ‘C-Cl’ bond is easiest in
Answer» The hydrolysis of ‘C-Cl’ bond is easiest in

Discussion

50.	Which of the following is a tautomer of CH3−C\|\|O−H?
Answer» Which of the following is a tautomer of $C H_{3} - C \| \| O - H$ ?

50.

Which of the following is a tautomer of CH3−C||O−H?

Answer»

Which of the following is a tautomer of

$C H_{3} - C | | O - H$ ?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

29. Which element has lowest electron affinity?g(1) O(2) S(3) Se(4) Te

BaCl2.2H2O which bond present?

A neon-dioxgen mixture contains 70.6g dioxygen and 167.5neon.If pressure of the mixture of gases in cylinder is 25bar.What is the partial pressure of dioxygen and neon in th mixture

Q 18/30 For the coagulation of 40 ml of ferric hydroxide sol, 10 ml of0.4 M KCI is required. Then, the coagulation value of KCI is

The oxidation state which is exhibited by boron is:

Which of the following having higher boiling point 1 propanal Acetone EthanolPropane

Draw resonating structures and resonance hybrid of CO2.

An organic compound A has only H, C and O. Compound A give red solid on reaction with 2, 4 D.N.P reagent. A react with OH−/Δ to give B as one of productThen most probable structure of A can be

A solution has 0.05 M Mg2+ and 0.05 M NH3. Calculate the concentration of NH4Cl required to prevent the formation of Mg(OH)2 in this solution. Ksp of Mg(OH)2=9.0×10−12 and ionization constant of NH3=1.8×10−5 (Given, √1.8=1.34)

give the differences between orbit,orbital,shell,subshell

15. From the following values of H and S decide whether these reactions will be spontaneous or non-spontaneous at 298 K. Reaction (i); H = –10.5 × 103 J mol–1 S = +31 J K–1 mol–1 Reaction (ii); H = –11.7 × 103 J mol–1 S = –105 J K–1 mol–1

Certain substance emits only the wavelengths λ1, λ2, λ3 and λ4 when it is at a high temperature. When this substance is at a colder temperature, it will absorb only the following wavelengths

Is demineralised or distilled water useful for drinking purposes? If not, how can it be made useful?

In a SN2 substitution reaction of the type:R−Br+Cl−DMF−−−→R−Cl+Br−which one of the following has the highest relative rate?

35. which of the following has the same number ds-electrons as the d-electrons in Fe2+?(2) Ca(4) P(3) N(1)li

The vapour pressure of water at 80∘C is 355 mm of Hg. The total pressure of a 1 L vessel containing O2 saturated with water at 80∘C is 760 mm of Hg. The contents of the vessel are pumped into a 0.3 L vessel at the same temperature. What is the partial pressure of O2?

Metal reacts with acid to produce hydrogen gas. But when metal reacts with HNO3 hydrogen gas is not given out. Give a reason.

16 Explain primary valence.

What is the difference between matter-wave and electromagnetic wave?

In Milikan's oil drop experiment, which of the following charges can exist on an oil drop? Charge on electron e = −1.6×10−19 C

If it is asked to write rate law expression for hydrolysis of ester , should i consider it 1st or 2nd order ?

24. Delta Hf C2H4 = 12.5 kcal Heat of atomization of c =171 kcal Bond energy of H2=104.3 kcal Bond energy of C-H =99.3 kcal What is C=C bond energy

A gaseous hydrocarbongives upon combustion 0.72 g. of water and 3.08 g. of CO2. Theempirical formula of the hydrocarbon is:

Difference b/w abscission and senescence ??

Induced charge q can never be greater than inducing charge Q

29. How to find reactivity of benzene compounds towards electrophilic substitution ?

10 mL of 1 N HCl ,25 ml of 2 N H_{2 }SO_4 and 40ml of X N HNO_3 are mixed and made up to 2000 ml .100ml of this solution required 30 ml of NaOH taken from a solution containing 4 g of NaOH in 250 ml of solution . What is the value of X

For the given Wedge-Dash Notation of a compound.Which of the following represents the correct Fischer Projection of the same compound ?

If the radius of Mg2+ is 6.5 pm and O−2 is 14 pm, then calculate the coordination number of Mg2+ in the crystal of MgO.

V verus T curves at constant pressures P1 and P2 for an idealgas are shown in the figure,

How to bascity of any compound

how does electron microscope works

4. Consider the reaction at 300 K H2 (g) + Cl2 (g) = 2HCl (g) , heat of enthalpy = -185 KJ If 3 mole of H2 completely reacts with 3 mol of Cl2 to form HCl, change in internal energy of the reaction will be 1) Zero 2) -185 KJ 3) 555 KJ 4) None of these

A gas expands from a volume of 3.0 dm3 to 5.0 dm3 against a constant pressure of 3.0 atm the work done during expansion is used to heat 10.0 mole of water of temperature 290.0 K Calculate the final temperature of water (specific heat of water =4.184 JK−1g−1)

Sulphur forms the chlorides S2Cl2 and SCl2. The equivalent mass of sulphur in SCL2 is

How many nodal planes are possible for 3d orbital?

Zn2+(aq)+2e→Zn(s). This is

Rank the following substituent groups in order of decreasing priority according to the Cahn-Ingold-Prelog system: -CH(CH3)2 -CH2Br -CH2CH2Br (a) 2> 3> 1 (b)1>3>2 (c)3>1>2 (d) 2>1>3

For the reaction 1/8 S8 +3/2 O2 --> SO3 , the difference of heat change at constant pressure and constant constant volume at 27 degree Celsius will be

A diatomic molecule has dipole moment of 1.2 D. If the bond distance is 1.0 ∘A, what fraction of charge e exists on each atom?

H2O2 can be obtained when following reacts with H2SO4 expect with

Number of monohydric phenols possible with the molecular formula C7H8O

In the reaction given below, expected product is/are

The alkene which gives 4,4-dimethylpentan-2-one on reductive ozonolysis is

The hydrolysis of ‘C-Cl’ bond is easiest in

Which of the following is a tautomer of CH3−C||O−H?