46295 + Interview Questions in Chemistry

1.	Calculate the heat of formation of acetic acid from the following data. CH3COOH(l) + 2O2(g) →2CO2(g) + 2H2O(l), △H= −207.9 K cal C(s) + O2(g)→CO2(g) △H = −94.48 K cal H2(g) + 12O2(g)→H2O(l) △ H = −68.4 K cal
Answer» Calculate the heat of formation of acetic acid from the following data. $C H_{3} C O O H (l) + 2 O_{2} (g) \to 2 C O_{2} (g) + 2 H_{2} O (l), △ H = - 207.9 K c a l$ $C (s) + O_{2} (g) \to C O 2 (g) △ H = - 94.48 K c a l$ $H_{2} (g) + \frac{1}{2} O_{2} (g) \to H_{2} O (l) △ H = - 68.4 K c a l$

Discussion

2.	The volume strength of a sample of H2O2 is 9.0 V. The mass of H2O2 present in 350 mL of this solution is:
Answer» The volume strength of a sample of $H_{2} O_{2}$ is $9.0 V$ . The mass of $H_{2} O_{2}$ present in $350 m L$ of this solution is:

Discussion

3.	Identify the correct order of boiling points of the following compounds. (1) CH3CH2CH2CH2OH (2) CH3CH2CH2CHO (3) CH3CH2CH2COOH
Answer» Identify the correct order of boiling points of the following compounds. $(1) C H_{3} C H_{2} C H_{2} C H_{2} O H$ $(2) C H_{3} C H_{2} C H_{2} C H O$ $(3) C H_{3} C H_{2} C H_{2} C O O H$

Discussion

4.	Cannizzaro rxn of two molecules of benzaldehyde .(not self cannizzaro)
Answer» Cannizzaro rxn of two molecules of benzaldehyde .(not self cannizzaro)

Discussion

5.	Give the brief explanation on universal set.
Answer» Give the brief explanation on universal set.

Discussion

6.	An element is represented by ZXA, where Z is atomic number which is also equal to number of proton, A is mass number and X is symbol of the element. Mass number (A) = Number of protons (Z) + Number of neutrons. Isoelectronic: Species/ elements having same number of electron Isodiaphers: Elements having same value of \|(A−2Z)\| Isotopes: Atoms having same number of proton Which of the following species is isoelectronic with the hydride ion?
Answer» An element is represented by $_{Z} X^{A}$ , where Z is atomic number which is also equal to number of proton, A is mass number and X is symbol of the element. Mass number (A) = Number of protons (Z) + Number of neutrons. Isoelectronic: Species/ elements having same number of electron Isodiaphers: Elements having same value of $\| (A - 2 Z) \|$ Isotopes: Atoms having same number of proton Which of the following species is isoelectronic with the hydride ion?

Discussion

7.	To a metal nitrate, when KI solution is added, a black ppt. is produced at first, on adding excess of KI orange solution is produced. Metal chloride gives white turbidity on dilution. Metal belongs to nth A group and mth period of periodic table. Then value of m + n is
Answer» To a metal nitrate, when KI solution is added, a black ppt. is produced at first, on adding excess of KI orange solution is produced. Metal chloride gives white turbidity on dilution. Metal belongs to nth A group and mth period of periodic table. Then value of m + n is

Discussion

8.	The molarity of solution obtained by mixing 500 mL of 2 M HNO3 and 250 mL of 0.5 M HCl and 250 mL of water will be
Answer» The molarity of solution obtained by mixing 500 mL of 2 M $H N O_{3}$ and 250 mL of 0.5 M HCl and 250 mL of water will be

Discussion

9.	Rank the following compounds in order of decreasing acidity (strongest acid first) :
Answer» Rank the following compounds in order of decreasing acidity (strongest acid first) :

Discussion

10.	The precursor carbocation to the product in the following reaction is
Answer» The precursor carbocation to the product in the following reaction is

Discussion

11.	An open flask containing air is heated from 300 K to 500 K. What percentage of air will escape to the atmosphere, if pressure is kept constant?
Answer» An open flask containing air is heated from 300 K to 500 K. What percentage of air will escape to the atmosphere, if pressure is kept constant?

Discussion

12.	The mass,specific heat capacity and initial temperature of a sphere is 1000gm,1/2 cal/gm degree C and 80 degree C respectively. The mass of the liquid and the caloriemeter are 900 gm and 200 gm respectively,and initially both were at room temperature 20 degree C. Both caloriemeter and the sphere are made of same material. If the hot sphere is dropped in the caloriemeter, the steady state temperature after mixing is found to be 40 degree C, then the specific heat capacity of unknown liquid is 1) 0.25 cal/gm degree C 2) 0.5 cal/gm degree C 3) 1 cal/gm degree C 4) none of these Ans given is option 3. Please give detailed explanation. I won't be able to understand concise answers.
Answer» The mass,specific heat capacity and initial temperature of a sphere is 1000gm,1/2 cal/gm degree C and 80 degree C respectively. The mass of the liquid and the caloriemeter are 900 gm and 200 gm respectively,and initially both were at room temperature 20 degree C. Both caloriemeter and the sphere are made of same material. If the hot sphere is dropped in the caloriemeter, the steady state temperature after mixing is found to be 40 degree C, then the specific heat capacity of unknown liquid is 1) 0.25 cal/gm degree C 2) 0.5 cal/gm degree C 3) 1 cal/gm degree C 4) none of these Ans given is option 3. Please give detailed explanation. I won't be able to understand concise answers.

12.

The mass,specific heat capacity and initial temperature of a sphere is 1000gm,1/2 cal/gm degree C and 80 degree C respectively. The mass of the liquid and the caloriemeter are 900 gm and 200 gm respectively,and initially both were at room temperature 20 degree C. Both caloriemeter and the sphere are made of same material. If the hot sphere is dropped in the caloriemeter, the steady state temperature after mixing is found to be 40 degree C, then the specific heat capacity of unknown liquid is 1) 0.25 cal/gm degree C 2) 0.5 cal/gm degree C 3) 1 cal/gm degree C 4) none of these Ans given is option 3. Please give detailed explanation. I won't be able to understand concise answers.

Answer»

The mass,specific heat capacity and initial temperature of a sphere is 1000gm,1/2 cal/gm degree C and 80 degree C respectively. The mass of the liquid and the caloriemeter are 900 gm and 200 gm respectively,and initially both were at room temperature 20 degree C. Both caloriemeter and the sphere are made of same material. If the hot sphere is dropped in the caloriemeter, the steady state temperature after mixing is found to be 40 degree C, then the specific heat capacity of unknown liquid is

1) 0.25 cal/gm degree C

2) 0.5 cal/gm degree C

3) 1 cal/gm degree C

4) none of these

Ans given is option 3.

Please give detailed explanation. I won't be able to understand concise answers.

Discussion

13.	Match list-I with list-II and select the correct answer using the codes given below - List-I List-II Ion Radius (in pm) (I) Li+ (a) 216 (II) Na+ (b) 195 (III) Br- (c) 60 (IV) I- (d) 95 Codes: I II III IV
Answer» Match list-I with list-II and select the correct answer using the codes given below - List-I List-II Ion Radius (in pm) (I) Li+ (a) 216 (II) Na+ (b) 195 (III) Br- (c) 60 (IV) I- (d) 95 Codes: I II III IV

13.

Match list-I with list-II and select the correct answer using the codes given below - List-I List-II Ion Radius (in pm) (I) Li+ (a) 216 (II) Na+ (b) 195 (III) Br- (c) 60 (IV) I- (d) 95 Codes: I II III IV

Answer»

Match list-I with list-II and select the correct answer using the codes given below -

List-I List-II

Ion Radius (in pm)

(I) Li+ (a) 216

(II) Na+ (b) 195

(III) Br- (c) 60

(IV) I- (d) 95

Codes: I II III IV

Discussion

14.	Which has highest bond dissociation energy? CH3F. CH3Cl . CH3Br. CH3I PLS EXPLAIIN IN DETAIL ans is ch3F MY opinion ch3I coz in ch3F F is more electronegativity so it has pulled electrons therefore it is easier to break the bond And CH3I. I will nt attract electron compared to F
Answer» Which has highest bond dissociation energy? CH3F. CH3Cl . CH3Br. CH3I PLS EXPLAIIN IN DETAIL ans is ch3F MY opinion ch3I coz in ch3F F is more electronegativity so it has pulled electrons therefore it is easier to break the bond And CH3I. I will nt attract electron compared to F

14.

Which has highest bond dissociation energy? CH3F. CH3Cl . CH3Br. CH3I PLS EXPLAIIN IN DETAIL ans is ch3F MY opinion ch3I coz in ch3F F is more electronegativity so it has pulled electrons therefore it is easier to break the bond And CH3I. I will nt attract electron compared to F

Answer»

Which has highest bond dissociation energy?

CH3F. CH3Cl . CH3Br. CH3I

PLS EXPLAIIN IN DETAIL ans is ch3F

MY opinion ch3I coz in ch3F F is more electronegativity so it has pulled electrons therefore it is easier to break the bond

And CH3I. I will nt attract electron compared to F

Discussion

15.	Write the reactions of (i) aromatic and (ii) aliphatic primary amines with nitrous acid.
Answer» Write the reactions of (i) aromatic and (ii) aliphatic primary amines with nitrous acid.

Discussion

16.	The carbonate that is least stable thermally is:
Answer» The carbonate that is least stable thermally is:

Discussion

17.	Glucose + Tollen's reagent → Silver mirror. The process shows:
Answer» Glucose + Tollen's reagent → Silver mirror. The process shows:

Discussion

18.	Column-I: Property; Column-II: Variation of property; Column-III: Magnitude Column-IColumn-IIColumn-III(I)Electron a affinity(EA1)(i)Decreases along the period(P)Highest in halogen in their respective periods(II)Ionization energy(IE1)(ii)Directly proportional to Zeff(Q)Highest in noble gases in their respective periods (III)Electronegativity(iii)Decreases down the group(R)Highest in alkali metals in their respective periods (IV)Electropositive character(iv)Inversly proportional to size(S)Moderate in noble gases in their respective periods The only correct combination for the energy required to knock out most loosely bounded electron from isolated gaseous atom is:
Answer» Column-I: Property; Column-II: Variation of property; Column-III: Magnitude $\begin{matrix} Column-I & Column-II & Column-III (I) & Electron a affinity (E A_{1}) & (i) & Decreases along the period & (P) & Highest in halogen in their respective periods (I I) & Ionization energy (I E_{1}) & (i i) & Directly proportional to Z_{e f f} & (Q) & Highest in noble gases in their respective periods (I I I) & Electronegativity & (i i i) & Decreases down the group & (R) & Highest in alkali metals in their respective periods (I V) & Electropositive character & (i v) & Inversly proportional to size & (S) & Moderate in noble gases in their respective periods \end{matrix}$ The only correct combination for the energy required to knock out most loosely bounded electron from isolated gaseous atom is:

Discussion

19.	What is the hybridization of ICN(s)?
Answer» What is the hybridization of ICN(s)?

Discussion

20.	I know that spices on chips is not adsorption phenomena. But what about dust particles on table top? Is it also not adsorption?
Answer» I know that spices on chips is not adsorption phenomena. But what about dust particles on table top? Is it also not adsorption?

Discussion

21.	What products are expected from the dis-proportionation reaction of hypochlorous acid?
Answer» What products are expected from the dis-proportionation reaction of hypochlorous acid?

Discussion

22.	In which of the following reactions, the acid formed will give a positive test of silver mirror with Tollen’s reagent?
Answer» In which of the following reactions, the acid formed will give a positive test of silver mirror with Tollen’s reagent?

Discussion

23.	What will be the order of Ist ionisation energy
Answer» What will be the order of $I^{s t}$ ionisation energy

Discussion

24.	For a 10% increase in volume, what would be the % increase in temperature at a constant pressure?
Answer» For a $10 %$ increase in volume, what would be the $%$ increase in temperature at a constant pressure?

Discussion

25.	The correct order of decreasing second ionisation enthalpy of Ti(22), V(23), Cr(24) and Mn(25) is [CBSE AIPMT 2008]
Answer» The correct order of decreasing second ionisation enthalpy of Ti(22), V(23), Cr(24) and Mn(25) is [CBSE AIPMT 2008]

Discussion

26.	An organic compound exhibits optical isomerism when
Answer» An organic compound exhibits optical isomerism when

Discussion

27.	Equal volumes of three acid solutions of pH 3, 4, and 5 are mixed in a vessel. What will be the H+ ion concentration of the mixture ? antilogb(−x)=b−x
Answer» Equal volumes of three acid solutions of $p H 3, 4, a n d 5$ are mixed in a vessel. What will be the $H^{+}$ ion concentration of the mixture ? $a n t i l o g_{b} (- x) = b^{- x}$

Discussion

28.	Calculate molar mass of CO(NO3)2.6H2O
Answer» Calculate molar mass of CO(NO3)2.6H2O

Discussion

29.	The coefficient of volume expansion of a gas is:
Answer» The coefficient of volume expansion of a gas is:

Discussion

30.	Prove that the volume of the largest cone that can be inscribed in a sphere of radius R is 827 of the volume of the sphere.
Answer» Prove that the volume of the largest cone that can be inscribed in a sphere of radius R is $\frac{8}{27}$ of the volume of the sphere.

Discussion

31.	Which is heaviest among the following?
Answer» Which is heaviest among the following?

Discussion

32.	What is emulsion? What role does it plays in surface chemistry
Answer» What is emulsion? What role does it plays in surface chemistry

Discussion

33.	Why does the temperature of a room increase when the door of the refrigirator is kept open?
Answer» Why does the temperature of a room increase when the door of the refrigirator is kept open?

Discussion

34.	According to Bohr's theory, the angular momentum of an electron in 5th orbit is:
Answer» According to Bohr's theory, the angular momentum of an electron in 5th orbit is:

Discussion

35.	Half-lives of two radioactive elements A and B are 20 minutes and 40 minutes respectively. Initially the samples have equal number of nuclei. After 80 minutes, the ratio of decayed numbers of A and B nuclei will be
Answer» Half-lives of two radioactive elements A and B are 20 minutes and 40 minutes respectively. Initially the samples have equal number of nuclei. After 80 minutes, the ratio of decayed numbers of A and B nuclei will be

Discussion

36.	Which of the following substances do not have standard enthalpy of formation as zero?
Answer» Which of the following substances do not have standard enthalpy of formation as zero?

Discussion

37.	The standard enthalpy of formation of CH4(g), CO2(g) and H2O(g) are -76.2, -394.8 and -241.6 kJ/mol respectively. Calculate the heat of combustion of methane.
Answer» The standard enthalpy of formation of CH4(g), CO2(g) and H2O(g) are -76.2, -394.8 and -241.6 kJ/mol respectively. Calculate the heat of combustion of methane.

Discussion

38.	Identify (X):
Answer» Identify (X):

Discussion

39.	Which of the following is a primary amine [AMU 1988]
Answer» Which of the following is a primary amine [AMU 1988]

39.

Which of the following is a primary amine [AMU 1988]

Answer»

Which of the following is a primary amine

[AMU 1988]

Discussion

40.	Which of the following is not isoelectronic species
Answer» Which of the following is not isoelectronic species

Discussion

41.	Which one of the following crystals does not exhibit Frenkel defefect
Answer» Which one of the following crystals does not exhibit Frenkel defefect

Discussion

42.	Which of the following liquids will show maximum expansion if same volume is heated through the same rise in temperature?
Answer» Which of the following liquids will show maximum expansion if same volume is heated through the same rise in temperature?

Discussion

43.	Calculate the change of entropy ΔrS∘m at 298 K for the reaction in which urea is formed from NH3 and CO2. The standard entropy of NH2CONH2 is 174.0 JK−1mol−1. For NH3, CO2 and H2O it is 192.3, 213 and 69.9JK−1
Answer» Calculate the change of entropy $Δ_{r} S_{m}^{\circ}$ at 298 K for the reaction in which urea is formed from $N H_{3}$ and $C O_{2}$ . The standard entropy of $N H_{2} C O N H_{2}$ is 174.0 $J K^{- 1} m o l^{- 1}$ . For $N H_{3}$ , $C O_{2}$ and $H_{2} O$ it is 192.3, 213 and 69.9 $J K^{- 1}$

Discussion

44.	How will you Convert butan-2-one to Propanoic acid?
Answer» How will you Convert butan-2-one to Propanoic acid?

Discussion

45.	What is meant by the term bond order? Calculate the bond order of: N2 , O2 , O+2 and O−2 .
Answer» What is meant by the term bond order? Calculate the bond order of: $N_{2}$ , $O_{2}$ , $O_{2}^{+}$ and $O_{2}^{-}$ .

Discussion

46.	Work function of a metal is 3eV. An electromagnetic radiation of 200 nm is incident on metal surface, calculate the maximum speed of photoelectrons ejected. (Take the value of h= 6.6×10−34Js)
Answer» Work function of a metal is 3eV. An electromagnetic radiation of 200 nm is incident on metal surface, calculate the maximum speed of photoelectrons ejected. (Take the value of h= $6.6 \times 10^{- 34} J s)$

Discussion

47.	Among the following, the weakest conjugate base is :
Answer» Among the following, the weakest conjugate base is :

Discussion

48.	For the given reaction , the major product A will be :
Answer» For the given reaction , the major product A will be :

Discussion

49.	The efficiency of carnot engine working between 20∘C (low temperature) and T∘C (high temperature) is 20%. Find value of T.
Answer» The efficiency of carnot engine working between $20^{\circ} C$ (low temperature) and $T^{\circ} C$ (high temperature) is 20%. Find value of $T$ .

Discussion

50.	In the following skew conformation of ethane, H′−C−C−H′′ dihedral angle is
Answer» In the following skew conformation of ethane, $H^{'} - C - C - H^{''}$ dihedral angle is

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Calculate the heat of formation of acetic acid from the following data. CH3COOH(l) + 2O2(g) →2CO2(g) + 2H2O(l), △H= −207.9 K cal C(s) + O2(g)→CO2(g) △H = −94.48 K cal H2(g) + 12O2(g)→H2O(l) △ H = −68.4 K cal

The volume strength of a sample of H2O2 is 9.0 V. The mass of H2O2 present in 350 mL of this solution is:

Identify the correct order of boiling points of the following compounds. (1) CH3CH2CH2CH2OH (2) CH3CH2CH2CHO (3) CH3CH2CH2COOH

Cannizzaro rxn of two molecules of benzaldehyde .(not self cannizzaro)

Give the brief explanation on universal set.

To a metal nitrate, when KI solution is added, a black ppt. is produced at first, on adding excess of KI orange solution is produced. Metal chloride gives white turbidity on dilution. Metal belongs to nth A group and mth period of periodic table. Then value of m + n is

The molarity of solution obtained by mixing 500 mL of 2 M HNO3 and 250 mL of 0.5 M HCl and 250 mL of water will be

Rank the following compounds in order of decreasing acidity (strongest acid first) :

The precursor carbocation to the product in the following reaction is

An open flask containing air is heated from 300 K to 500 K. What percentage of air will escape to the atmosphere, if pressure is kept constant?

Match list-I with list-II and select the correct answer using the codes given below - List-I List-II Ion Radius (in pm) (I) Li+ (a) 216 (II) Na+ (b) 195 (III) Br- (c) 60 (IV) I- (d) 95 Codes: I II III IV

Which has highest bond dissociation energy? CH3F. CH3Cl . CH3Br. CH3I PLS EXPLAIIN IN DETAIL ans is ch3F MY opinion ch3I coz in ch3F F is more electronegativity so it has pulled electrons therefore it is easier to break the bond And CH3I. I will nt attract electron compared to F

Write the reactions of (i) aromatic and (ii) aliphatic primary amines with nitrous acid.

The carbonate that is least stable thermally is:

Glucose + Tollen's reagent → Silver mirror. The process shows:

What is the hybridization of ICN(s)?

I know that spices on chips is not adsorption phenomena. But what about dust particles on table top? Is it also not adsorption?

What products are expected from the dis-proportionation reaction of hypochlorous acid?

In which of the following reactions, the acid formed will give a positive test of silver mirror with Tollen’s reagent?

What will be the order of Ist ionisation energy

For a 10% increase in volume, what would be the % increase in temperature at a constant pressure?

The correct order of decreasing second ionisation enthalpy of Ti(22), V(23), Cr(24) and Mn(25) is [CBSE AIPMT 2008]

An organic compound exhibits optical isomerism when

Equal volumes of three acid solutions of pH 3, 4, and 5 are mixed in a vessel. What will be the H+ ion concentration of the mixture ? antilogb(−x)=b−x

Calculate molar mass of CO(NO3)2.6H2O

The coefficient of volume expansion of a gas is:

Prove that the volume of the largest cone that can be inscribed in a sphere of radius R is 827 of the volume of the sphere.

Which is heaviest among the following?

What is emulsion? What role does it plays in surface chemistry

Why does the temperature of a room increase when the door of the refrigirator is kept open?

According to Bohr's theory, the angular momentum of an electron in 5th orbit is:

Half-lives of two radioactive elements A and B are 20 minutes and 40 minutes respectively. Initially the samples have equal number of nuclei. After 80 minutes, the ratio of decayed numbers of A and B nuclei will be

Which of the following substances do not have standard enthalpy of formation as zero?

The standard enthalpy of formation of CH4(g), CO2(g) and H2O(g) are -76.2, -394.8 and -241.6 kJ/mol respectively. Calculate the heat of combustion of methane.

Identify (X):

Which of the following is a primary amine [AMU 1988]

Which of the following is not isoelectronic species

Which one of the following crystals does not exhibit Frenkel defefect

Which of the following liquids will show maximum expansion if same volume is heated through the same rise in temperature?

Calculate the change of entropy ΔrS∘m at 298 K for the reaction in which urea is formed from NH3 and CO2. The standard entropy of NH2CONH2 is 174.0 JK−1mol−1. For NH3, CO2 and H2O it is 192.3, 213 and 69.9JK−1

How will you Convert butan-2-one to Propanoic acid?

What is meant by the term bond order? Calculate the bond order of: N2 , O2 , O+2 and O−2 .

Work function of a metal is 3eV. An electromagnetic radiation of 200 nm is incident on metal surface, calculate the maximum speed of photoelectrons ejected. (Take the value of h= 6.6×10−34Js)

Among the following, the weakest conjugate base is :

For the given reaction , the major product A will be :

The efficiency of carnot engine working between 20∘C (low temperature) and T∘C (high temperature) is 20%. Find value of T.

In the following skew conformation of ethane, H′−C−C−H′′ dihedral angle is