46295 + Interview Questions in Chemistry

1.	In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the option out of the choices given below in each question. Assertion (A) Combustion of 16g of methane gives 18g of water. Reason (R) In the combustion of methane, water is one of the products. (a) Both A and R are true but R are true but R is not the correct explanation of A. (b) A is true but R is true (c) A is false but R is true (d) Both A and R are false
Answer» In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the option out of the choices given below in each question. Assertion (A) Combustion of 16g of methane gives 18g of water. Reason (R) In the combustion of methane, water is one of the products. (a) Both A and R are true but R are true but R is not the correct explanation of A. (b) A is true but R is true (c) A is false but R is true (d) Both A and R are false

1.

In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the option out of the choices given below in each question. Assertion (A) Combustion of 16g of methane gives 18g of water. Reason (R) In the combustion of methane, water is one of the products. (a) Both A and R are true but R are true but R is not the correct explanation of A. (b) A is true but R is true (c) A is false but R is true (d) Both A and R are false

Answer»

In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the option out of the choices given below in each question.

Assertion (A) Combustion of 16g of methane gives 18g of water.

Reason (R) In the combustion of methane, water is one of the products.

(a) Both A and R are true but R are true but R is not the correct explanation of A.

(b) A is true but R is true

(c) A is false but R is true

(d) Both A and R are false

Discussion

2.	Why cannot aromatic primary amines be prepared by Gabriel phthalimide synthesis?
Answer» Why cannot aromatic primary amines be prepared by Gabriel phthalimide synthesis?

Discussion

3.	For the reaction, 2A+B→A2B the rate =k[A][B]2 with k=2.0×10−6 mol−2 L−2 s−1. Calculate the initial rate of reaction when [A]=0.1 mol L−1,[B]=0.2 mol L−1. Calculate the rate of reaction after [A] is reduced to 0.06 mol L−1.
Answer» For the reaction, $2 A + B \to A_{2} B$ the rate $= k [A] [B]^{2}$ with $k = 2.0 \times 10^{- 6} m o l^{- 2} L^{- 2} s^{- 1}$ . Calculate the initial rate of reaction when $[A] = 0.1 m o l L^{- 1}, [B] = 0.2 m o l L^{- 1}$ . Calculate the rate of reaction after [A] is reduced to $0.06 m o l L^{- 1}$ .

Discussion

4.	One mole ideal monoatomic gas is heated according to path AB and AC. If temperature of state B and C are equal. Calculate qACqAB×10
Answer» One mole ideal monoatomic gas is heated according to path AB and AC. If temperature of state B and C are equal. Calculate $\frac{q_{A C}}{q_{A B}} \times 10$

Discussion

5.	If the distance between Na+ and Cl− ions in NaCl crystal is α pm, the edge length of the unit cell is:
Answer» If the distance between $N a^{+}$ and $C l^{-}$ ions in NaCl crystal is $α$ pm, the edge length of the unit cell is:

Discussion

6.	Hydrogen is considered as s orbital then Why helium is considered as p orbital instead of s orbital?
Answer» Hydrogen is considered as s orbital then Why helium is considered as p orbital instead of s orbital?

Discussion

7.	B2H6 reacts with O2 and H2O respectvely to form:
Answer» $B_{2} H_{6}$ reacts with $O_{2}$ and $H_{2} O$ respectvely to form:

Discussion

8.	In which of the following processes, the bond order has increased and the magnetic behaviour has changed?
Answer» In which of the following processes, the bond order has increased and the magnetic behaviour has changed?

Discussion

9.	How a weighted piston makes a pressure constant while a gas expands on heating.
Answer» How a weighted piston makes a pressure constant while a gas expands on heating.

Discussion

10.	Which of the following orbital has the highest energy?
Answer» Which of the following orbital has the highest energy?

Discussion

11.	Can Antimatter or Dark matter be the only thing which does not involve chemistry? ( As per the question asked in mole concept)
Answer» Can Antimatter or Dark matter be the only thing which does not involve chemistry? ( As per the question asked in mole concept)

Discussion

12.	HOW TO SAY IF A COMPOUND IS GIVEN AND IT IS ALKALINE OR BASIC
Answer» HOW TO SAY IF A COMPOUND IS GIVEN AND IT IS ALKALINE OR BASIC

Discussion

13.	Electron gain enthalpy of Noble Gas is almost Zero . Justify
Answer» Electron gain enthalpy of Noble Gas is almost Zero . Justify

Discussion

14.	Coenzyme is
Answer» Coenzyme is

Discussion

15.	The correct stability order of the given resonating structures is :
Answer» The correct stability order of the given resonating structures is :

Discussion

16.	A neon-dioxygen mixture contains 70.6 g dioxygen and 167.5 g neon. If the pressure of the mixture of gases in the cylinder is 25 bar, what is the partial pressure of dioxygen and neon in the mixture?
Answer» A neon-dioxygen mixture contains $70.6 g$ dioxygen and $167.5 g$ neon. If the pressure of the mixture of gases in the cylinder is 25 bar, what is the partial pressure of dioxygen and neon in the mixture?

Discussion

17.	The concentration of oxalic acid is x mol litre−1. 40 mL of this solution reacts with 16 mL of 0.05 M acidified KMnO4. What is the pH of ′x′ M oxalic acid solution? (Assume that oxalic acid dissociates completely.)
Answer» The concentration of oxalic acid is $x$ mol litre $^{- 1}$ . $40 m L$ of this solution reacts with $16 m L$ of $0.05 M$ acidified $K M n O_{4}$ . What is the $p H$ of $^{'} x^{'} M$ oxalic acid solution? (Assume that oxalic acid dissociates completely.)

Discussion

18.	Which of the following compound would undergo SN1 reaction faster and why? (C6H5)CH2Cl. Or. (C6H11)CH2Cl
Answer» Which of the following compound would undergo SN1 reaction faster and why? (C₆H₅)CH₂Cl. Or. (C₆H₁₁)CH₂Cl

18.

Which of the following compound would undergo SN1 reaction faster and why? (C6H5)CH2Cl. Or. (C6H11)CH2Cl

Answer»

Which of the following compound would undergo SN1 reaction faster and why?

(C₆H₅)CH₂Cl. Or. (C₆H₁₁)CH₂Cl

Discussion

19.	Bond order?
Answer» Bond order?

Discussion

20.	What is the oxidation number of the phosphorus in PF3?
Answer» What is the oxidation number of the phosphorus in PF₃?

Discussion

21.	NX is produced by the following step of reactions M + X2⟶MX2⟶MX2+X2⟶M3X8 M3X8+N2CO3⟶NX +CO2+M3O4 How much M (metal) is consumed to produce 206 gm of NX. (Take at wt. of M = 56, N = 23, X = 80)
Answer» NX is produced by the following step of reactions M + $X_{2}$ $⟶$ $M X_{2}$ $⟶$ $M X_{2}$ + $X_{2}$ $⟶$ $M_{3} X_{8}$ $M_{3} X_{8}$ + $N_{2} C O_{3}$ $⟶$ NX + $C O_{2}$ + $M_{3} O_{4}$ How much M (metal) is consumed to produce 206 gm of NX. (Take at wt. of M = 56, N = 23, X = 80)

Discussion

22.	Ca2B6O11+Na2CO3Fused−−−→(A)+(B)+CaCO3(A)+CO2→(B)+Na2CO3Solution(B)+Conc.HCI→NaCI+Acid ↓H2O(C)Strongly−−−−−→heated (D) Acid(C)(D)+CuSO4Heated−−−−−→inflameBlue coloured(E) compoundcompound (E) is -
Answer» $C a_{2} B_{6} O_{11} + N a_{2} C O_{3} F u s e d - -- \to (A) + (B) + C a C O_{3} (A) + C O_{2} \to (B) + N a_{2} C O_{3} Solution (B) + C o n c . H C I \to N a C I + A c i d ↓ H_{2} O (C) S t r o n g l y - ---- \to h e a t e d (D) Acid (C) (D) + C u S O_{4} H e a t e d - ---- \to i n f l a m e Blue coloured (E) compound compound (E) is -$

Discussion

23.	The compound which will not give iodoform test on treatment with alkali and iodine is:
Answer» The compound which will not give iodoform test on treatment with alkali and iodine is:

Discussion

24.	Banana bond is:
Answer» Banana bond is:

Discussion

25.	The stability of benzene diazonium salts is because of
Answer» The stability of benzene diazonium salts is because of

Discussion

26.	Calculate the oxidation number of sulphur, chromium and nitrogen in H2SO5, Cr2O2−7 and NO−3−. Suggest structure of these compounds. Count for the fallacy. xCr22−O2−7 xN2−O−3
Answer» Calculate the oxidation number of sulphur, chromium and nitrogen in $H_{2} S O_{5},$ $C r_{2} O_{7}^{2 -}$ and $N O_{3 -}^{-}$ . Suggest structure of these compounds. Count for the fallacy. $x C r_{2} 2 - O_{7}^{2 -}$ $x N 2 - O_{3}^{-}$

26.

Calculate the oxidation number of sulphur, chromium and nitrogen in H2SO5, Cr2O2−7 and NO−3−. Suggest structure of these compounds. Count for the fallacy. xCr22−O2−7 xN2−O−3

Answer»

Calculate the oxidation number of sulphur, chromium and nitrogen in $H_{2} S O_{5},$
$C r_{2} O_{7}^{2 -}$ and $N O_{3 -}^{-}$ . Suggest structure of these compounds. Count for the fallacy.

$x C r_{2} 2 - O_{7}^{2 -}$

$x N 2 - O_{3}^{-}$

Discussion

27.	At ordinary temperature and pressure, among halogens, chlorine is a gas, bromine is a liquid and iodine is a solid. This is because
Answer» At ordinary temperature and pressure, among halogens, chlorine is a gas, bromine is a liquid and iodine is a solid. This is because

Discussion

28.	What transition in the hydrogen spectrum would have the same wavelength as the Balmer transition n = 4 to n = 2 of He+ spectrum?
Answer» What transition in the hydrogen spectrum would have the same wavelength as the Balmer transition n = 4 to n = 2 of $H e^{+}$ spectrum?

Discussion

29.	In a chemical reaction, the energy required to dissociate 4g of H2 into free gaseous atoms is x KJ. What will be the value of ∆HH-H?
Answer» In a chemical reaction, the energy required to dissociate 4g of H₂into free gaseous atoms is x KJ. What will be the value of ∆H_H-H?

Discussion

30.	Cl2(g)+OH−(aq)→OCl−(aq)+Cl−(aq) Balance the above reaction using oxidation number method.
Answer» $C l_{2} (g) + O H^{-} (a q) \to O C l^{-} (a q) + C l^{-} (a q)$ Balance the above reaction using oxidation number method.

Discussion

31.	Given, E0Cr(3+)/Cr=−0.74V;E0MnO−4/Mn2+=1.51V E0Cr2O2−7/Cr3+=1.33V;E0Cl/Cl−=1.36V Based on the data given above strongest oxidising agent will be
Answer» Given, $E_{C r^{(} 3 +) / C r}^{0} = - 0.74 V; E_{M n O_{4}^{-} / M n^{2 +}}^{0} = 1.51 V$ $E_{C r_{2} O_{7}^{2 -} / C r^{3 +}}^{0} = 1.33 V; E_{C l / C l^{-}}^{0} = 1.36 V$ Based on the data given above strongest oxidising agent will be

Discussion

32.	At 100∘C the vapour pressure of a solution of 6.5 g of a solute in 100 g water is 732 mm. If Kb=0.52, the boiling point of this solution will be
Answer» At $100^{\circ} C$ the vapour pressure of a solution of 6.5 g of a solute in 100 g water is 732 mm. If $K_{b} = 0.52$ , the boiling point of this solution will be

Discussion

33.	Equal Volumes of three acid solutions of pH 3, 4 and 5 are mixed in a vessel. What will be the H⊕ concentration in the mixture?
Answer» Equal Volumes of three acid solutions of pH 3, 4 and 5 are mixed in a vessel. What will be the $H^{\oplus}$ concentration in the mixture?

Discussion

34.	Platinum crystallizes in a face – centered cubic crystal with a unit cell of edge length 'a'. The distance between nearest neighbour is:
Answer» Platinum crystallizes in a face – centered cubic crystal with a unit cell of edge length 'a'. The distance between nearest neighbour is:

Discussion

35.	Which of the following species is the least stable?
Answer» Which of the following species is the least stable?

Discussion

36.	The root mean square velocity of an ideal gas in a closed container of fixed volume is increased from 5×104 cm s−1 to 10×104 cm s−1 Which of the following statement correctly explains how the change is accomplished
Answer» The root mean square velocity of an ideal gas in a closed container of fixed volume is increased from $5 \times 10^{4} c m s^{- 1}$ to $10 \times 10^{4} c m s^{- 1}$ Which of the following statement correctly explains how the change is accomplished

36.

The root mean square velocity of an ideal gas in a closed container of fixed volume is increased from 5×104 cm s−1 to 10×104 cm s−1 Which of the following statement correctly explains how the change is accomplished

Answer»

The root mean square velocity of an ideal gas in a closed container of fixed volume is increased from $5 \times 10^{4} c m s^{- 1}$ to $10 \times 10^{4} c m s^{- 1}$ Which of the following statement correctly explains how the change is accomplished

Discussion

37.	For which of the following reactions is Gay-Lussac’s law not valid?
Answer» For which of the following reactions is Gay-Lussac’s law not valid?

Discussion

38.	Which of the following is expected to exhibit optical isomerism? (en= ethylenediamine)
Answer» Which of the following is expected to exhibit optical isomerism? (en= ethylenediamine)

Discussion

39.	At 0∘C, the density of a certain oxide of a gas at 2 bar is same as that of dinitrogen at 5 bar. What is the molecular mass of the oxide?
Answer» At $0^{\circ} C$ , the density of a certain oxide of a gas at 2 bar is same as that of dinitrogen at 5 bar. What is the molecular mass of the oxide?

Discussion

40.	1 kg of a gas does 20 kJ of work and receives 16 kJ of heat when it is expanded between two states. A second kind of expansion can be found between the initial and final state which requires a heat input of 9 kJ. The work done by the gas in the second expansion is
Answer» $1 kg$ of a gas does $20 kJ$ of work and receives $16 kJ$ of heat when it is expanded between two states. A second kind of expansion can be found between the initial and final state which requires a heat input of $9 kJ$ . The work done by the gas in the second expansion is

Discussion

41.	Which of the following orders regarding melting point of lithium halides is true
Answer» Which of the following orders regarding melting point of lithium halides is true

Discussion

42.	A neutral lithium atom has three protons, three electrons and some neutrons (depending on the isotope). The modulus of energy of an electron in the 2nd orbit of a Li++ ion is ________ eV.___
Answer» A neutral lithium atom has three protons, three electrons and some neutrons (depending on the isotope). The modulus of energy of an electron in the 2nd orbit of a $L i^{+ +}$ ion is ________ eV. ___

Discussion

43.	Preparation of ethers by acid dehydration of secondary or tertiary alcohols is not a suitable method. Give reason.
Answer» Preparation of ethers by acid dehydration of secondary or tertiary alcohols is not a suitable method. Give reason.

Discussion

44.	Total number of ligands which can act as bidentate / polydentate ligands with same donor atoms/sites. DMG, en, Phen, Gly, acac, SO2−4, pyridine, PPh3
Answer» Total number of ligands which can act as bidentate / polydentate ligands with same donor atoms/sites. DMG, en, Phen, Gly, acac, $S O_{4}^{2 -},$ pyridine, $P P h_{3}$

Discussion

45.	Which of the following statements are correct? (a) Helium has the highest first ionisation enthalpy in the periodic table (b) Chlorine has less negative electron gain enthalpy than fluorine (c) Mercury and bromine are liquids at liquids at room temperature (d) In any period, the atomic radius of alkali metal is the highest
Answer» Which of the following statements are correct? (a) Helium has the highest first ionisation enthalpy in the periodic table (b) Chlorine has less negative electron gain enthalpy than fluorine (c) Mercury and bromine are liquids at liquids at room temperature (d) In any period, the atomic radius of alkali metal is the highest

Discussion

46.	The main product of the reaction CH3CH2Br and AgCN is:
Answer» The main product of the reaction $C H_{3} C H_{2} B r$ and AgCN is:

Discussion

47.	For the following bond cleavages, use curved-arrows to show the electron flow and classify each as homolysis or heterolysis. Identify reactive intermediate produced as free radical, carbocation and carbanion.
Answer» For the following bond cleavages, use curved-arrows to show the electron flow and classify each as homolysis or heterolysis. Identify reactive intermediate produced as free radical, carbocation and carbanion.

47.

For the following bond cleavages, use curved-arrows to show the electron flow and classify each as homolysis or heterolysis. Identify reactive intermediate produced as free radical, carbocation and carbanion.

Answer»

For the following bond cleavages, use curved-arrows to show the electron flow and classify each as homolysis or heterolysis. Identify reactive intermediate produced as free radical, carbocation and carbanion.

Discussion

48.	What volume of 0.10 M H2SO4 must be added to 50ml of 0.10 M NAOH solution to make a solution in which the molarity H2SO4 is 0.050 M!?
Answer» What volume of 0.10 M H₂SO₄ must be added to 50ml of 0.10 M NAOH solution to make a solution in which the molarity H₂SO₄ is 0.050 M!?

Discussion

49.	Which would be the correct product for the following reaction?
Answer» Which would be the correct product for the following reaction?

Discussion

50.	For the following (a) I− (b) Cl− (c) Br− The increasing order of nucleophilicity would be
Answer» For the following (a) $I^{-}$ (b) $C l^{-}$ (c) $B r^{-}$ The increasing order of nucleophilicity would be

50.

For the following (a) I− (b) Cl− (c) Br− The increasing order of nucleophilicity would be

Answer»

For the following

(a) $I^{-}$ (b) $C l^{-}$ (c) $B r^{-}$
The increasing order of nucleophilicity would be

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Why cannot aromatic primary amines be prepared by Gabriel phthalimide synthesis?

For the reaction, 2A+B→A2B the rate =k[A][B]2 with k=2.0×10−6 mol−2 L−2 s−1. Calculate the initial rate of reaction when [A]=0.1 mol L−1,[B]=0.2 mol L−1. Calculate the rate of reaction after [A] is reduced to 0.06 mol L−1.

One mole ideal monoatomic gas is heated according to path AB and AC. If temperature of state B and C are equal. Calculate qACqAB×10

If the distance between Na+ and Cl− ions in NaCl crystal is α pm, the edge length of the unit cell is:

Hydrogen is considered as s orbital then Why helium is considered as p orbital instead of s orbital?

B2H6 reacts with O2 and H2O respectvely to form:

In which of the following processes, the bond order has increased and the magnetic behaviour has changed?

How a weighted piston makes a pressure constant while a gas expands on heating.

Which of the following orbital has the highest energy?

Can Antimatter or Dark matter be the only thing which does not involve chemistry? ( As per the question asked in mole concept)

HOW TO SAY IF A COMPOUND IS GIVEN AND IT IS ALKALINE OR BASIC

Electron gain enthalpy of Noble Gas is almost Zero . Justify

Coenzyme is

The correct stability order of the given resonating structures is :

A neon-dioxygen mixture contains 70.6 g dioxygen and 167.5 g neon. If the pressure of the mixture of gases in the cylinder is 25 bar, what is the partial pressure of dioxygen and neon in the mixture?

The concentration of oxalic acid is x mol litre−1. 40 mL of this solution reacts with 16 mL of 0.05 M acidified KMnO4. What is the pH of ′x′ M oxalic acid solution? (Assume that oxalic acid dissociates completely.)

Which of the following compound would undergo SN1 reaction faster and why? (C6H5)CH2Cl. Or. (C6H11)CH2Cl

Bond order?

What is the oxidation number of the phosphorus in PF3?

NX is produced by the following step of reactions M + X2⟶MX2⟶MX2+X2⟶M3X8 M3X8+N2CO3⟶NX +CO2+M3O4 How much M (metal) is consumed to produce 206 gm of NX. (Take at wt. of M = 56, N = 23, X = 80)

Ca2B6O11+Na2CO3Fused−−−→(A)+(B)+CaCO3(A)+CO2→(B)+Na2CO3Solution(B)+Conc.HCI→NaCI+Acid ↓H2O(C)Strongly−−−−−→heated (D) Acid(C)(D)+CuSO4Heated−−−−−→inflameBlue coloured(E) compoundcompound (E) is -

The compound which will not give iodoform test on treatment with alkali and iodine is:

Banana bond is:

The stability of benzene diazonium salts is because of

Calculate the oxidation number of sulphur, chromium and nitrogen in H2SO5, Cr2O2−7 and NO−3−. Suggest structure of these compounds. Count for the fallacy. xCr22−O2−7 xN2−O−3

At ordinary temperature and pressure, among halogens, chlorine is a gas, bromine is a liquid and iodine is a solid. This is because

What transition in the hydrogen spectrum would have the same wavelength as the Balmer transition n = 4 to n = 2 of He+ spectrum?

In a chemical reaction, the energy required to dissociate 4g of H2 into free gaseous atoms is x KJ. What will be the value of ∆HH-H?

Cl2(g)+OH−(aq)→OCl−(aq)+Cl−(aq) Balance the above reaction using oxidation number method.

Given, E0Cr(3+)/Cr=−0.74V;E0MnO−4/Mn2+=1.51V E0Cr2O2−7/Cr3+=1.33V;E0Cl/Cl−=1.36V Based on the data given above strongest oxidising agent will be

At 100∘C the vapour pressure of a solution of 6.5 g of a solute in 100 g water is 732 mm. If Kb=0.52, the boiling point of this solution will be

Equal Volumes of three acid solutions of pH 3, 4 and 5 are mixed in a vessel. What will be the H⊕ concentration in the mixture?

Platinum crystallizes in a face – centered cubic crystal with a unit cell of edge length 'a'. The distance between nearest neighbour is:

Which of the following species is the least stable?

The root mean square velocity of an ideal gas in a closed container of fixed volume is increased from 5×104 cm s−1 to 10×104 cm s−1 Which of the following statement correctly explains how the change is accomplished

For which of the following reactions is Gay-Lussac’s law not valid?

Which of the following is expected to exhibit optical isomerism? (en= ethylenediamine)

At 0∘C, the density of a certain oxide of a gas at 2 bar is same as that of dinitrogen at 5 bar. What is the molecular mass of the oxide?

1 kg of a gas does 20 kJ of work and receives 16 kJ of heat when it is expanded between two states. A second kind of expansion can be found between the initial and final state which requires a heat input of 9 kJ. The work done by the gas in the second expansion is

Which of the following orders regarding melting point of lithium halides is true

A neutral lithium atom has three protons, three electrons and some neutrons (depending on the isotope). The modulus of energy of an electron in the 2nd orbit of a Li++ ion is ________ eV.___

Preparation of ethers by acid dehydration of secondary or tertiary alcohols is not a suitable method. Give reason.

Total number of ligands which can act as bidentate / polydentate ligands with same donor atoms/sites. DMG, en, Phen, Gly, acac, SO2−4, pyridine, PPh3

The main product of the reaction CH3CH2Br and AgCN is:

For the following bond cleavages, use curved-arrows to show the electron flow and classify each as homolysis or heterolysis. Identify reactive intermediate produced as free radical, carbocation and carbanion.

What volume of 0.10 M H2SO​​​4 must be added to 50ml of 0.10 M NAOH solution to make a solution in which the molarity H2SO​​​4 is 0.050 M!?

Which would be the correct product for the following reaction?

For the following (a) I− (b) Cl− (c) Br− The increasing order of nucleophilicity would be

A neutral lithium atom has three protons, three electrons and some neutrons (depending on the isotope). The modulus of energy of an electron in the 2nd orbit of a Li++ ion is ______ eV._

What volume of 0.10 M H2SO4 must be added to 50ml of 0.10 M NAOH solution to make a solution in which the molarity H2SO4 is 0.050 M!?