46295 + Interview Questions in Chemistry

1.	The reaction is an example of:
Answer» The reaction is an example of:

1.

The reaction is an example of:

Answer»

The reaction is an example of:

2.	Calculate the resonance energy of N2O from the following data: ΔHf of N2O is 82 kJ/mol N≡N 946 kJ/mol N=N 418 kJ/mol O=O 498 kJ/mol N=O 607 kJ/mol
Answer» Calculate the resonance energy of $N_{2} O$ from the following data: $Δ H_{f}$ of $N_{2} O$ is $82 kJ/mol$ $N \equiv N 946 kJ/mol$ $N = N 418 kJ/mol$ $O = O 498 kJ/mol$ $N = O 607 kJ/mol$

Discussion

3.	How can saline hydrides remove traces of water from organic compounds?
Answer» How can saline hydrides remove traces of water from organic compounds?

Discussion

4.	Gaseous benzene reacts with hydrogen gas in presence of a nickel catalyst to form gaseous cyclohexane according to the reaction: C6H6(g) + 3H2(g)→C6H12(g).A mixture of C6H6 and excess H2 has a pressure of 60 mm of Hg in an unknown volume. After the gas has been passed over a nickel catalyst and all benzene converted to cyclohexane, the pressure of the gas was 30 mm of Hg at same volume and temperature. The fraction of C6H6(by volume) present in the original volume is___.
Answer» Gaseous benzene reacts with hydrogen gas in presence of a nickel catalyst to form gaseous cyclohexane according to the reaction: $C_{6} H_{6} (g) + 3 H_{2} (g) \to C_{6} H_{12} (g) .$ A mixture of $C_{6} H_{6}$ and excess $H_{2}$ has a pressure of 60 mm of Hg in an unknown volume. After the gas has been passed over a nickel catalyst and all benzene converted to cyclohexane, the pressure of the gas was 30 mm of Hg at same volume and temperature. The fraction of $C_{6} H_{6}$ (by volume) present in the original volume is___.

Discussion

5.	Which of the following group(s) when attached to a benzene ring decreases the electron density at ortho/para positions?
Answer» Which of the following group(s) when attached to a benzene ring decreases the electron density at ortho/para positions?

Discussion

6.	How many elements does P(A) have, If A = Φ
Answer» How many elements does P(A) have, If A = Φ

Discussion

7.	Product (A) is :
Answer» Product (A) is :

7.

Product (A) is :

Answer»

Product (A) is :

Discussion

8.	Mercury is transported in metal containers made up of
Answer» Mercury is transported in metal containers made up of

Discussion

9.	The % compositions of sodium and phosphorous present in monosodium phosphate are respectively:
Answer» The % compositions of sodium and phosphorous present in monosodium phosphate are respectively:

Discussion

10.	What is the product of the reaction of H2O2with Cl2?
Answer» What is the product of the reaction of $H_{2} O_{2}$ with $C l_{2}$ ?

10.

What is the product of the reaction of H2O2with Cl2?

Answer»

What is the product of the reaction of $H_{2} O_{2}$ with $C l_{2}$ ?

Discussion

11.	In 50 mL of 0.2M−H2A solution, 30 mL of 0.5 M − NaOH solution is added at 25∘C The pH of resulting solution is (for H2A,Ka1=10−6;Ka2=10−12)
Answer» In $50 m L$ of $0.2 M - H_{2} A$ solution, $30 m L$ of $0.5 M - N a O H$ solution is added at $25^{\circ} C$ The pH of resulting solution is (for $H_{2} A, K_{a_{1}} = 10^{- 6}; K_{a_{2}} = 10^{- 12})$

Discussion

12.	Give an example of an ore which can be concentrated by magnetic separation.
Answer» Give an example of an ore which can be concentrated by magnetic separation.

Discussion

13.	Acetone is treated with excess of ethanol in the presence of HCl. The product obtained is:
Answer» Acetone is treated with excess of ethanol in the presence of $H C l$ . The product obtained is:

Discussion

14.	Question 20 Which of the following options represents the correct bond order? (a) O−2>O2>O+2 (b) O−2<O2<O+2 (c) O−2>O2<O+2 (d) O−2<O2>O+2
Answer» Question 20 Which of the following options represents the correct bond order? (a) $O_{2}^{-} > O_{2} > O_{2}^{+}$ (b) $O_{2}^{-} < O_{2} < O_{2}^{+}$ (c) $O_{2}^{-} > O_{2} < O_{2}^{+}$ (d) $O_{2}^{-} < O_{2} > O_{2}^{+}$

14.

Question 20 Which of the following options represents the correct bond order? (a) O−2>O2>O+2 (b) O−2<O2<O+2 (c) O−2>O2<O+2 (d) O−2<O2>O+2

Answer»

Question 20

Which of the following options represents the correct bond order?

(a) $O_{2}^{-} > O_{2} > O_{2}^{+}$

(b) $O_{2}^{-} < O_{2} < O_{2}^{+}$

(c) $O_{2}^{-} > O_{2} < O_{2}^{+}$

(d) $O_{2}^{-} < O_{2} > O_{2}^{+}$

Discussion

15.	Why do compounds having similar geometry have different magnetic moment?
Answer» Why do compounds having similar geometry have different magnetic moment?

Discussion

16.	Why molecularity is applicable only for elementary reactions and order is applicable for elementary as well as complex reactions?
Answer» Why molecularity is applicable only for elementary reactions and order is applicable for elementary as well as complex reactions?

Discussion

17.	Salt soda & soda ash respectively are
Answer» Salt soda & soda ash respectively are

Discussion

18.	Match the followingAlkali metalFlame colourA. Lithium I.VioletB.Potassium II. BlueC. Rubidium III. Crimson redD. Cesium IV. Red violet
Answer» Match the following Alkali metalFlame colour A. Lithium I.Violet B.Potassium II. Blue C. Rubidium III. Crimson red D. Cesium IV. Red violet

18.

Match the followingAlkali metalFlame colourA. Lithium I.VioletB.Potassium II. BlueC. Rubidium III. Crimson redD. Cesium IV. Red violet

Answer»

Match the following

Alkali metalFlame colour

A. Lithium I.Violet

B.Potassium II. Blue

C. Rubidium III. Crimson red

D. Cesium IV. Red violet

Discussion

19.	A plot of In K against 1T (abscissa) is expected to be a straight line with intercept on ordinate axis equal to?
Answer» A plot of In K against $\frac{1}{T}$ (abscissa) is expected to be a straight line with intercept on ordinate axis equal to?

Discussion

20.	pH of 0.01 M HS− will be -
Answer» pH of 0.01 M $H S^{-}$ will be -

Discussion

21.	Which condition is not satisfied by an ideal solution?
Answer» Which condition is not satisfied by an ideal solution?

Discussion

22.	Given E∘Cl2/Cl−=1.36 V,ECr3+/Cr=−0.74 V ECr2O2−7/Cr3+=1.33 V,E∘MnO−4/Mn2+=1.51 V Among the following, the strongest reducing agent is:
Answer» Given $E_{C l_{2} / C l^{-}}^{\circ} = 1.36 V, E_{C r^{3 +} / C r} = - 0.74 V$ $E_{C r_{2} O_{7}^{2 -} / C r^{3 +}} = 1.33 V, E_{M n O_{4}^{-} / M n^{2 +}}^{\circ} = 1.51 V$ Among the following, the strongest reducing agent is:

Discussion

23.	Group 2 elements are:
Answer» Group 2 elements are:

Discussion

24.	In photoelectric effect if the intensity of light is doubled then maximum kinetic energy of photoelectrons will become
Answer» In photoelectric effect if the intensity of light is doubled then maximum kinetic energy of photoelectrons will become

Discussion

25.	In which of the following molecule/ion, all the bond lengths are not of equal lengths?
Answer» In which of the following molecule/ion, all the bond lengths are not of equal lengths?

Discussion

26.	The electrochemical cell shown below is a concentration cell.M\|M2+ (Saturated solution of a sparingly soluble salt, MX2)\|\|M2+(0.001 mol dm−3)M. The emf of the cell depends on the difference in concentration of M2+ ions at the two electrodes. The emf of the cell at 298K is 0.059 The value of ΔG(kJmol−1) for the given cell is: (take1F=96500 C mol−1)
Answer» The electrochemical cell shown below is a concentration cell. $M \| M^{2 +}$ (Saturated solution of a sparingly soluble salt, $M X_{2}) \| \| M^{2 +} (0.001 m o l d m^{- 3}) M .$ The emf of the cell depends on the difference in concentration of $M^{2 +}$ ions at the two electrodes. The emf of the cell at 298K is 0.059 The value of $Δ G (k J m o l^{- 1})$ for the given cell is: (take $1 F = 96500 C m o l^{- 1})$

Discussion

27.	What weight of AgCl (in g) will be precipitated when a solution containing 1.99 g of NaCl is added to a solution containing 5.78 g of AgNO3? (Molar masses of Ag,Cl and Na are 108,35.5 and 23 g/mol respectively)
Answer» What weight of $A g C l$ (in g) will be precipitated when a solution containing 1.99 g of $N a C l$ is added to a solution containing 5.78 g of $A g N O_{3}$ ? (Molar masses of $A g, C l$ and $N a$ are $108, 35.5$ and 23 g/mol respectively)

Discussion

28.	Make the correct order of decreasing acid strength of the following compounds.
Answer» Make the correct order of decreasing acid strength of the following compounds.

Discussion

29.	Which one of the following substance has the highest proton affinity
Answer» Which one of the following substance has the highest proton affinity

29.

Which one of the following substance has the highest proton affinity

Answer»

Which one of the following substance has the highest proton affinity

Discussion

30.	An excess of Cl2 reacts with ammonia, the products formed are:
Answer» An excess of $C l_{2}$ reacts with ammonia, the products formed are:

Discussion

31.	A solution of urea (mol. mass 56g mol-1) boils at 100.18°C under atmospheric pressure. If Kf and Kb for water are 1.86 and 0.512 K kg mol-1 respectively, the above solution will freeze at
Answer» A solution of urea (mol. mass 56g mol^-1) boils at 100.18°C under atmospheric pressure. If K_f and K_bfor water are 1.86 and 0.512 K kg mol^-1 respectively, the above solution will freeze at

Discussion

32.	The plot of concentration of the reactant R versus time for a reaction is a straight line with a negative slope. The reaction follows a
Answer» The plot of concentration of the reactant R versus time for a reaction is a straight line with a negative slope. The reaction follows a

Discussion

33.	What is the IUPAC name of the simplest bicycle compound?
Answer» What is the IUPAC name of the simplest bicycle compound?

Discussion

34.	A solid disc rolls clockwise without slipping over a horizontal path with a constant speed v.Then the magnitude of the velocities of points A, B and C (see figure) with respect to a standing observer are respectively
Answer» A solid disc rolls clockwise without slipping over a horizontal path with a constant speed $v$ .Then the magnitude of the velocities of points $A$ , $B$ and $C$ (see figure) with respect to a standing observer are respectively

34.

A solid disc rolls clockwise without slipping over a horizontal path with a constant speed v.Then the magnitude of the velocities of points A, B and C (see figure) with respect to a standing observer are respectively

Answer»

A solid disc rolls clockwise without slipping over a horizontal path with a constant speed $v$ .Then the magnitude of the velocities of points $A$ , $B$ and $C$ (see figure) with respect to a standing observer are respectively

Discussion

35.	A binary liquid solution is prepared by mixing n-heptane and ethanol. Which one of the following statements is correct regarding the behaviour of the solution ?
Answer» A binary liquid solution is prepared by mixing n-heptane and ethanol. Which one of the following statements is correct regarding the behaviour of the solution ?

Discussion

36.	Where P represent major product.Find P
Answer» Where P represent major product.Find P

Discussion

37.	The property of catenation:
Answer» The property of catenation:

Discussion

38.	The component of cement that has the property of setting instantaneously in presence of water and imparting initial internal strength to cement is-
Answer» The component of cement that has the property of setting instantaneously in presence of water and imparting initial internal strength to cement is-

Discussion

39.	The molar conductivity of a solution of a weak acid HX(0.01 M) is 10 times smaller than the molar conductivity of a solution of a weak acid HY(0.10 M). If λ∘X−≈λ∘Y−, the difference in their pKa values, pKa(HX)−pKa(HY), is (consider degree of ionizaiton of both acids to be
Answer» The molar conductivity of a solution of a weak acid $H X (0.01 M)$ is 10 times smaller than the molar conductivity of a solution of a weak acid $H Y (0.10 M)$ . If $λ_{X^{-}}^{\circ} \approx λ_{Y^{-}}^{\circ}$ , the difference in their $p K_{a}$ values, $p K_{a} (H X) - p K_{a} (H Y)$ , is (consider degree of ionizaiton of both acids to be <<1)

Discussion

40.	The resistance of a conductivity cell filled with a solution of an electrolyte of concentration 0.1 M is 100Ω. The conductivity of this solution is 1.29 Sm−1. The resistance of the same cell, when filled with 0.02 M of the same solution, is 520Ω. The molar conductivity of 0.02 M solution of the electrolyte will be: (Take 129520=0.248)
Answer» The resistance of a conductivity cell filled with a solution of an electrolyte of concentration 0.1 M is $100 Ω$ . The conductivity of this solution is $1.29 S m^{- 1}$ . The resistance of the same cell, when filled with 0.02 M of the same solution, is $520 Ω$ . The molar conductivity of 0.02 M solution of the electrolyte will be: (Take $\frac{129}{520} = 0.248$ )

Discussion

41.	In the extraction of copper from its sulphide ore, the metal is formed by the reduction of Cu2O with:
Answer» In the extraction of copper from its sulphide ore, the metal is formed by the reduction of $C u_{2} O$ with:

Discussion

42.	For a d-electron, the orbital angular momentum is:
Answer» For a d-electron, the orbital angular momentum is:

Discussion

43.	α anomer of an aldohexose E has a specific rotation of 120∘ while β anomer of E has a specific rotation of 80∘. If an equilibrium mixture of α,β anomers of E has the specific rotation of 96∘, then what will be percentage of the α -anomer in the equilibrium mixture assuming the concentration of the open structure is almost negligible?
Answer» $α$ anomer of an aldohexose E has a specific rotation of $120^{\circ}$ while $β$ anomer of E has a specific rotation of $80^{\circ}$ . If an equilibrium mixture of $α, β$ anomers of E has the specific rotation of $96^{\circ}$ , then what will be percentage of the $α$ -anomer in the equilibrium mixture assuming the concentration of the open structure is almost negligible?

Discussion

44.	For a reaction Ea = and K=3.2×104S−1 at 300 k.
Answer» For a reaction $E_{a}$ = and $K = 3.2 \times 10^{4} S^{- 1}$ at 300 k.

Discussion

45.	On dissolving 0.5 g of a non-volatile non-ionic solute in 39 g of benzene, its vapour pressure decreases from 650 mm of Hg to 640 mm of Hg. The depression in freezing point of benzene (in K) upon addition of the solute is: ( Given: The molar mass and the molal freezing point depression constant for benzene are 78 g mol–1 and 5.12KKgmol–1, respectively
Answer» On dissolving 0.5 g of a non-volatile non-ionic solute in 39 g of benzene, its vapour pressure decreases from 650 mm of Hg to 640 mm of Hg. The depression in freezing point of benzene (in K) upon addition of the solute is: ( Given: The molar mass and the molal freezing point depression constant for benzene are $78 g m o l^{- 1}$ and $5.12 K K g m o l^{- 1}$ , respectively

Discussion

46.	The number of octahedral sites per sphere in F.C.C. structure is
Answer» The number of octahedral sites per sphere in F.C.C. structure is

Discussion

47.	When calcium acetate and calcium formate are heated, it forms:
Answer» When calcium acetate and calcium formate are heated, it forms:

Discussion

48.	Henry's law constant for the molality of methane in benzene at 298 K is 4.27×105 mm Hg. Calculate the solubility of methane in benzene at 298 K under 760 mm Hg.
Answer» Henry's law constant for the molality of methane in benzene at 298 K is 4.27×105 mm Hg. Calculate the solubility of methane in benzene at 298 K under 760 mm Hg.

Discussion

49.	Total number of CN− ion that are involved in the dissociation of ICN(liq.) is
Answer» Total number of $C N^{-}$ ion that are involved in the dissociation of ICN(liq.) is

Discussion

50.	2gm of O2 at 27∘C and 760 mm of Hg pressure has volume
Answer» 2gm of $O_{2}$ at 27 $^{\circ}$ C and 760 mm of Hg pressure has volume

50.

2gm of O2 at 27∘C and 760 mm of Hg pressure has volume

Answer»

2gm of $O_{2}$ at 27 $^{\circ}$ C and 760 mm of Hg pressure has volume

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The reaction is an example of:

Calculate the resonance energy of N2O from the following data: ΔHf of N2O is 82 kJ/mol N≡N 946 kJ/mol N=N 418 kJ/mol O=O 498 kJ/mol N=O 607 kJ/mol

How can saline hydrides remove traces of water from organic compounds?

Which of the following group(s) when attached to a benzene ring decreases the electron density at ortho/para positions?

How many elements does P(A) have, If A = Φ

Product (A) is :

Mercury is transported in metal containers made up of

The % compositions of sodium and phosphorous present in monosodium phosphate are respectively:

What is the product of the reaction of H2O2with Cl2?

In 50 mL of 0.2M−H2A solution, 30 mL of 0.5 M − NaOH solution is added at 25∘C The pH of resulting solution is (for H2A,Ka1=10−6;Ka2=10−12)

Give an example of an ore which can be concentrated by magnetic separation.

Acetone is treated with excess of ethanol in the presence of HCl. The product obtained is:

Question 20 Which of the following options represents the correct bond order? (a) O−2&gt;O2&gt;O+2 (b) O−2&lt;O2&lt;O+2 (c) O−2&gt;O2&lt;O+2 (d) O−2&lt;O2&gt;O+2

Why do compounds having similar geometry have different magnetic moment?

Why molecularity is applicable only for elementary reactions and order is applicable for elementary as well as complex reactions?

Salt soda &amp; soda ash respectively are

Match the followingAlkali metalFlame colourA. Lithium I.VioletB.Potassium II. BlueC. Rubidium III. Crimson redD. Cesium IV. Red violet

A plot of In K against 1T (abscissa) is expected to be a straight line with intercept on ordinate axis equal to?

pH of 0.01 M HS− will be -

Which condition is not satisfied by an ideal solution?

Given E∘Cl2/Cl−=1.36 V,ECr3+/Cr=−0.74 V ECr2O2−7/Cr3+=1.33 V,E∘MnO−4/Mn2+=1.51 V Among the following, the strongest reducing agent is:

Group 2 elements are:

In photoelectric effect if the intensity of light is doubled then maximum kinetic energy of photoelectrons will become

In which of the following molecule/ion, all the bond lengths are not of equal lengths?

What weight of AgCl (in g) will be precipitated when a solution containing 1.99 g of NaCl is added to a solution containing 5.78 g of AgNO3? (Molar masses of Ag,Cl and Na are 108,35.5 and 23 g/mol respectively)

Make the correct order of decreasing acid strength of the following compounds.

Which one of the following substance has the highest proton affinity

An excess of Cl2 reacts with ammonia, the products formed are:

A solution of urea (mol. mass 56g mol-1) boils at 100.18°C under atmospheric pressure. If Kf and Kb for water are 1.86 and 0.512 K kg mol-1 respectively, the above solution will freeze at

The plot of concentration of the reactant R versus time for a reaction is a straight line with a negative slope. The reaction follows a

What is the IUPAC name of the simplest bicycle compound?

A solid disc rolls clockwise without slipping over a horizontal path with a constant speed v.Then the magnitude of the velocities of points A, B and C (see figure) with respect to a standing observer are respectively

A binary liquid solution is prepared by mixing n-heptane and ethanol. Which one of the following statements is correct regarding the behaviour of the solution ?

Where P represent major product.Find P

The property of catenation:

The component of cement that has the property of setting instantaneously in presence of water and imparting initial internal strength to cement is-

The molar conductivity of a solution of a weak acid HX(0.01 M) is 10 times smaller than the molar conductivity of a solution of a weak acid HY(0.10 M). If λ∘X−≈λ∘Y−, the difference in their pKa values, pKa(HX)−pKa(HY), is (consider degree of ionizaiton of both acids to be

In the extraction of copper from its sulphide ore, the metal is formed by the reduction of Cu2O with:

For a d-electron, the orbital angular momentum is:

For a reaction Ea = and K=3.2×104S−1 at 300 k.

The number of octahedral sites per sphere in F.C.C. structure is

When calcium acetate and calcium formate are heated, it forms:

Henry's law constant for the molality of methane in benzene at 298 K is 4.27×105 mm Hg. Calculate the solubility of methane in benzene at 298 K under 760 mm Hg.

Total number of CN− ion that are involved in the dissociation of ICN(liq.) is

2gm of O2 at 27∘C and 760 mm of Hg pressure has volume

Question 20 Which of the following options represents the correct bond order? (a) O−2>O2>O+2 (b) O−2<O2<O+2 (c) O−2>O2<O+2 (d) O−2<O2>O+2

Salt soda & soda ash respectively are