46295 + Interview Questions in Chemistry

1.	If the solubility of CaF2 in water at 18∘C is 2.05×10−4mol L−1. Calculate its solubility product at the given temperature.
Answer» If the solubility of $C a F_{2}$ in water at $18^{\circ} C$ is $2.05 \times 10^{- 4} m o l L^{- 1}$ . Calculate its solubility product at the given temperature.

Discussion

2.	Conjugate base of Hydrazoic acid is
Answer» Conjugate base of Hydrazoic acid is

Discussion

3.	In 50 mL of 0.2 M H2A solution, 25 mL of 0.4 M NaOH solution is added at 25oC. 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, $25 m L$ of $0.4 M N a O H$ solution is added at $25^{o} C$ . The $p H$ of resulting solution is (for $H_{2} A, K_{a_{1}} = 10^{- 6}; K_{a_{2}} = 10^{- 12}$ )

Discussion

4.	Why the distance between two polynucleotide chains in dna remain almost constant
Answer» Why the distance between two polynucleotide chains in dna remain almost constant

Discussion

5.	The order of decreasing reactivity towards an electrophilic reagent for the following I. Benzene II. Toulene III. Chloro benzoic acid IV.Phenol
Answer» The order of decreasing reactivity towards an electrophilic reagent for the following I. Benzene II. Toulene III. Chloro benzoic acid IV.Phenol

5.

The order of decreasing reactivity towards an electrophilic reagent for the following I. Benzene II. Toulene III. Chloro benzoic acid IV.Phenol

Answer»

The order of decreasing reactivity towards an electrophilic reagent for the following

I. Benzene II. Toulene III. Chloro benzoic acid IV.Phenol

Discussion

6.	Bond order of He2,He+2 and He2+2 are respectively:
Answer» Bond order of $H e_{2}, H e_{2}^{+}$ and $H e_{2}^{2 +}$ are respectively:

Discussion

7.	The angular momentum of an electron in a Bohr orbit of H atom is 4.4×10−34 kg m2 s−1 . The wavelength of the spectral line emitted when the electron falls from this level to the next lower level is x×10−4 cm−1. The value of x is (Given: RH=1.1×105 cm−1) (take: π=3,and Plank's constant = 6.6×10−34)
Answer» The angular momentum of an electron in a Bohr orbit of $H$ atom is $4.4 \times 10^{- 34} k g m^{2} s^{- 1}$ . The wavelength of the spectral line emitted when the electron falls from this level to the next lower level is $x \times 10^{- 4} c m^{- 1}$ . The value of $x$ is (Given: $R_{H} = 1.1 \times 10^{5} c m^{- 1}$ ) (take: $π = 3, and Plank's constant$ = $6.6 \times 10^{- 34}$ )

Discussion

8.	Select the correct statement for non-bonding and anti-bonding orbitals:
Answer» Select the correct statement for non-bonding and anti-bonding orbitals:

Discussion

9.	Among the following oxides, the one which is most basic is:
Answer» Among the following oxides, the one which is most basic is:

Discussion

10.	a unit cell consists of a cube in which there are A atoms at the corners and B atoms at the face centres and A atoms are missing from 2 corners in each unit cell. What is the simplest formula of the compound?
Answer» a unit cell consists of a cube in which there are A atoms at the corners and B atoms at the face centres and A atoms are missing from 2 corners in each unit cell. What is the simplest formula of the compound?

Discussion

11.	Difference between volatility and boiling and evaporation?
Answer» Difference between volatility and boiling and evaporation?

Discussion

12.	Which substance is added to water containing suspended impurities to coagulate the suspended impurities and make water fit for drinking purposes.
Answer» Which substance is added to water containing suspended impurities to coagulate the suspended impurities and make water fit for drinking purposes.

Discussion

13.	When atoms are placed at all 12 edges of cube how many atoms are present per unit cell?
Answer» When atoms are placed at all 12 edges of cube how many atoms are present per unit cell?

Discussion

14.	1 mole of H2O and CO are taken in a 10 liter container at equilibrium point 40% of H2O reacts with CO to form H2O & CO2 Calculate the equilibrium constant for the reaction.
Answer» 1 mole of H₂O and CO are taken in a 10 liter container at equilibrium point 40% of H₂O reacts with CO to form H₂O & CO₂Calculate the equilibrium constant for the reaction.

Discussion

15.	Hydrolysis of methyl cyanides with dil. mineral acids gives:
Answer» Hydrolysis of methyl cyanides with dil. mineral acids gives:

Discussion

16.	Any important concepts for jee main which may not be 100% sure For all subjects (PCM) Please if there is please give me
Answer» Any important concepts for jee main which may not be 100% sure For all subjects (PCM) Please if there is please give me

16.

Any important concepts for jee main which may not be 100% sure For all subjects (PCM) Please if there is please give me

Answer»

Any important concepts for jee main which may not be 100% sure

For all subjects (PCM)

Please if there is please give me

Discussion

17.	Which of the following is a polar molecule?
Answer» Which of the following is a polar molecule?

Discussion

18.	The base is attached to which position of sugar to form nucleoside?
Answer» The base is attached to which position of sugar to form nucleoside?

Discussion

19.	In most cases, for a rise of 10K temperature, the rate constant is doubled or tripled. This is due to the reason that ?
Answer» In most cases, for a rise of 10K temperature, the rate constant is doubled or tripled. This is due to the reason that ?

Discussion

20.	Lithium fluoride has high lattice energy than other alkali metal fluoride then also its melting point is low. why?
Answer» Lithium fluoride has high lattice energy than other alkali metal fluoride then also its melting point is low. why?

Discussion

21.	Natural preparation of ozone
Answer» Natural preparation of ozone

Discussion

22.	Electric charges having same magnitude of electric charge 'q' columbs are placed at x= 1m, 2m, 4m 8m and so on. If any two consecutive charges have opposite sign but the first charge is necessarily positive ,what will be the potential at x=0?
Answer» Electric charges having same magnitude of electric charge 'q' columbs are placed at x= 1m, 2m, 4m 8m and so on. If any two consecutive charges have opposite sign but the first charge is necessarily positive ,what will be the potential at x=0?

Discussion

23.	Of the three varieties of cyclo-octasulphur polymorphs - the alpha, beta and gamma forms, the most stable polymorph near room temperature is __.
Answer» Of the three varieties of cyclo-octasulphur polymorphs - the alpha, beta and gamma forms, the most stable polymorph near room temperature is __.

Discussion

24.	Among the following complexes, the one that can exhibit optical activity is:
Answer» Among the following complexes, the one that can exhibit optical activity is:

Discussion

25.	How will you convert nitromethane into dimethylamine?
Answer» How will you convert nitromethane into dimethylamine?

Discussion

26.	Which of the following will react with water?
Answer» Which of the following will react with water?

Discussion

27.	Which of the following arrangement of molecules is correct on the basis of their dipole moments
Answer» Which of the following arrangement of molecules is correct on the basis of their dipole moments

27.

Which of the following arrangement of molecules is correct on the basis of their dipole moments

Answer»

Which of the following arrangement of molecules is correct on the basis of their dipole moments

Discussion

28.	What is anode?
Answer» What is anode?

Discussion

29.	What is the formula for calculating no of lone pairs of any compound?
Answer» What is the formula for calculating no of lone pairs of any compound?

Discussion

30.	The internal energy of helium gas is 250 joule per litre, then the pressure of gas will be
Answer» The internal energy of helium gas is 250 joule per litre, then the pressure of gas will be

Discussion

31.	The species having bond order different from that in CO is 1)NO- 2)NO+ 3)CN- 4)N² CAN YOU PLEASE TELL SOLUTION IN DETAILED MANNER?
Answer» The species having bond order different from that in CO is 1)NO- 2)NO+ 3)CN- 4)N² CAN YOU PLEASE TELL SOLUTION IN DETAILED MANNER?

31.

The species having bond order different from that in CO is 1)NO- 2)NO+ 3)CN- 4)N² CAN YOU PLEASE TELL SOLUTION IN DETAILED MANNER?

Answer»

The species having bond order different from that in CO is

1)NO-

2)NO+

3)CN-

4)N²

CAN YOU PLEASE TELL SOLUTION IN DETAILED MANNER?

Discussion

32.	Boric acid is a weak acid. Thus, it behaves as
Answer» Boric acid is a weak acid. Thus, it behaves as

Discussion

33.	Determine Kc for the reaction, 12N2(g)+12O2(g)+12Br2(g)⇌NOBr(g) from the following data at 298 K; The equilibrium constants for the following reactions, 2NO(g)⇌N2(g)+O2(g) and NO(g)+12Br2(g)⇌NOBr(g) are 0.36×1030 and 1.8 respectively:
Answer» Determine $K_{c}$ for the reaction, $\frac{1}{2} N_{2} (g) + \frac{1}{2} O_{2} (g) + \frac{1}{2} B r_{2} (g) ⇌ N O B r (g)$ from the following data at $298 K$ ; The equilibrium constants for the following reactions, $2 N O (g) ⇌ N_{2} (g) + O_{2} (g)$ and $N O (g) + \frac{1}{2} B r_{2} (g) ⇌ N O B r (g)$ $are 0.36 \times 10^{30} and 1.8 respectively :$

Discussion

34.	What is the charge of magnesium ion in MgCl2?
Answer» What is the charge of magnesium ion in $M g {C l}_{2}$ ?

Discussion

35.	For the process: H2O(l) (1 bar, 373 K)⇌H2O(g) (1 bar, 373 K) the correct set of thermodynamic parameters is:
Answer» For the process: $H_{2} O (l) (1 bar, 373 K) ⇌ H_{2} O (g) (1 bar, 373 K)$ the correct set of thermodynamic parameters is:

Discussion

36.	In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the coreect answer out of the following choices. (a) Both assertion and reason are true and reason is the coreect explanation of assertion. (b) Both assertion and reason are true but reason is not the correct explanation of assertion. (c) Assertion is true but reason is false. (d) Assertion is false but reason is true. (e) Assertion and reason both are wrong. Assertion (A) Sulphide ores are concentrated by froth flottion method. Reason (R) Cresols stabilise the froth in froth floatation method.
Answer» In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the coreect answer out of the following choices. (a) Both assertion and reason are true and reason is the coreect explanation of assertion. (b) Both assertion and reason are true but reason is not the correct explanation of assertion. (c) Assertion is true but reason is false. (d) Assertion is false but reason is true. (e) Assertion and reason both are wrong. Assertion (A) Sulphide ores are concentrated by froth flottion method. Reason (R) Cresols stabilise the froth in froth floatation method.

Discussion

37.	The atomic radius of Ag is closest to:
Answer» The atomic radius of $A g$ is closest to:

Discussion

38.	Which of the following compounds exhibits stereoisomerism?
Answer» Which of the following compounds exhibits stereoisomerism?

Discussion

39.	Which of the following is least thermally stable?
Answer» Which of the following is least thermally stable?

Discussion

40.	Justify the given statement with suitable examples "the properties of the elements are a periodic function of their atomic numbers".
Answer» Justify the given statement with suitable examples "the properties of the elements are a periodic function of their atomic numbers".

Discussion

41.	Which of the following alcohols will yield the corresponding alkyl chloride on reaction with concentrated HCl at room temperature?
Answer» Which of the following alcohols will yield the corresponding alkyl chloride on reaction with concentrated HCl at room temperature?

41.

Which of the following alcohols will yield the corresponding alkyl chloride on reaction with concentrated HCl at room temperature?

Answer»

Which of the following alcohols will yield the corresponding alkyl chloride on reaction with concentrated HCl at room temperature?

Discussion

42.	Question 2 Why does H+ ion always get associated with other atom or molecules? (a) Ionisation enthalpy of hydrogen resembles that of alkali metals. (b) Its reactivity is similar to halogens (c) It resembles both alkali metals and halogens (d) Loss of an electron from hydrogen atom results in a nucleus of very small size as compare to other or ions. Due to small size it cannot exist free.
Answer» Question 2 Why does $H^{+}$ ion always get associated with other atom or molecules? (a) Ionisation enthalpy of hydrogen resembles that of alkali metals. (b) Its reactivity is similar to halogens (c) It resembles both alkali metals and halogens (d) Loss of an electron from hydrogen atom results in a nucleus of very small size as compare to other or ions. Due to small size it cannot exist free.

42.

Question 2 Why does H+ ion always get associated with other atom or molecules? (a) Ionisation enthalpy of hydrogen resembles that of alkali metals. (b) Its reactivity is similar to halogens (c) It resembles both alkali metals and halogens (d) Loss of an electron from hydrogen atom results in a nucleus of very small size as compare to other or ions. Due to small size it cannot exist free.

Answer»

Question 2

Why does $H^{+}$ ion always get associated with other atom or molecules?

(a) Ionisation enthalpy of hydrogen resembles that of alkali metals.

(b) Its reactivity is similar to halogens

(c) It resembles both alkali metals and halogens

(d) Loss of an electron from hydrogen atom results in a nucleus of very small size as compare to other or ions. Due to small size it cannot exist free.

Discussion

43.	What are enzyme inhibitors ? Classify them on the basis of their mode of attachments on the active site of enzymes. With the help of diagrams explain how do inhibitors inhibit the enzymatic activity.
Answer» What are enzyme inhibitors ? Classify them on the basis of their mode of attachments on the active site of enzymes. With the help of diagrams explain how do inhibitors inhibit the enzymatic activity.

Discussion

44.	At the isoelectric point for amino acid, the species present are:
Answer» At the isoelectric point for amino acid, the species present are:

Discussion

45.	Which of the following statement(s) is/are correct?
Answer» Which of the following statement(s) is/are correct?

Discussion

46.	For a first order reaction A(g)→2B(g)+C(g) at constant volume and 300 K, the total pressure at the beginning (t=0) and time t are Po and Pt respectively. Initially, only A is present with concentration [A]o and t1/2 is the time required for the partial pressure of A to reach a third of its initial value. The correct options are: (Assume that all these gases behave as ideal gaes)
Answer» For a first order reaction $A (g) \to 2 B (g) + C (g)$ at constant volume and 300 K, the total pressure at the beginning (t=0) and time t are $P_{o}$ and $P_{t}$ respectively. Initially, only $A$ is present with concentration $[A]_{o}$ and $t_{1 / 2}$ is the time required for the partial pressure of $A$ to reach a third of its initial value. The correct options are: (Assume that all these gases behave as ideal gaes)

Discussion

47.	When Ph−OH reacts with C2H5I with anhydrous C2H5OH as the solvent in the presence of ethoxide ions, what is the product of this reaction?
Answer» When $P h - O H$ reacts with $C_{2} H_{5} I$ with anhydrous $C_{2} H_{5} O H$ as the solvent in the presence of ethoxide ions, what is the product of this reaction?

Discussion

48.	The diameter of zinc atom is 2.6 A. Calculate (a) radius of zinc atom in pm and (b) number of atoms present in a length of 1.6 cm if the zinc atoms are arranged side by side lengthwise.
Answer» The diameter of zinc atom is 2.6 A. Calculate (a) radius of zinc atom in pm and (b) number of atoms present in a length of 1.6 cm if the zinc atoms are arranged side by side lengthwise.

Discussion

49.	Find the quantum number ′n′ corresponding to the state of He+ ion, if on transition to the ground state that ion emits two photons in succession with wavelength 108.5 and 30.4 nm (take RH=1.09×105 cm−1)
Answer» Find the quantum number $^{'} n^{'}$ corresponding to the state of $H e^{+}$ ion, if on transition to the ground state that ion emits two photons in succession with wavelength $108.5$ and $30.4 n m$ (take $R_{H} = 1.09 \times 10^{5} c m^{- 1}$ )

Discussion

50.	The value of ∫ax2−bx√c2x2−(ax2+b)2dx is equal to
Answer» The value of $\int \frac{a x^{2} - b}{x \sqrt{c^{2} x^{2} - (a x^{2} + b)^{2}}} d x$ is equal to

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

If the solubility of CaF2 in water at 18∘C is 2.05×10−4mol L−1. Calculate its solubility product at the given temperature.

Conjugate base of Hydrazoic acid is

In 50 mL of 0.2 M H2A solution, 25 mL of 0.4 M NaOH solution is added at 25oC. The pH of resulting solution is (for H2A,Ka1=10−6; Ka2=10−12)

Why the distance between two polynucleotide chains in dna remain almost constant

The order of decreasing reactivity towards an electrophilic reagent for the following I. Benzene II. Toulene III. Chloro benzoic acid IV.Phenol

Bond order of He2,He+2 and He2+2 are respectively:

Select the correct statement for non-bonding and anti-bonding orbitals:

Among the following oxides, the one which is most basic is:

a unit cell consists of a cube in which there are A atoms at the corners and B atoms at the face centres and A atoms are missing from 2 corners in each unit cell. What is the simplest formula of the compound?

Difference between volatility and boiling and evaporation?

Which substance is added to water containing suspended impurities to coagulate the suspended impurities and make water fit for drinking purposes.

When atoms are placed at all 12 edges of cube how many atoms are present per unit cell?

1 mole of H2O and CO are taken in a 10 liter container at equilibrium point 40% of H2O reacts with CO to form H2O & CO2 Calculate the equilibrium constant for the reaction.

Hydrolysis of methyl cyanides with dil. mineral acids gives:

Any important concepts for jee main which may not be 100% sure For all subjects (PCM) Please if there is please give me

Which of the following is a polar molecule?

The base is attached to which position of sugar to form nucleoside?

In most cases, for a rise of 10K temperature, the rate constant is doubled or tripled. This is due to the reason that ?

Lithium fluoride has high lattice energy than other alkali metal fluoride then also its melting point is low. why?

Natural preparation of ozone

Electric charges having same magnitude of electric charge 'q' columbs are placed at x= 1m, 2m, 4m 8m and so on. If any two consecutive charges have opposite sign but the first charge is necessarily positive ,what will be the potential at x=0?

Of the three varieties of cyclo-octasulphur polymorphs - the alpha, beta and gamma forms, the most stable polymorph near room temperature is __.

Among the following complexes, the one that can exhibit optical activity is:

How will you convert nitromethane into dimethylamine?

Which of the following will react with water?

Which of the following arrangement of molecules is correct on the basis of their dipole moments

What is anode?

What is the formula for calculating no of lone pairs of any compound?

The internal energy of helium gas is 250 joule per litre, then the pressure of gas will be

The species having bond order different from that in CO is 1)NO- 2)NO+ 3)CN- 4)N² CAN YOU PLEASE TELL SOLUTION IN DETAILED MANNER?

Boric acid is a weak acid. Thus, it behaves as

Determine Kc for the reaction, 12N2(g)+12O2(g)+12Br2(g)⇌NOBr(g) from the following data at 298 K; The equilibrium constants for the following reactions, 2NO(g)⇌N2(g)+O2(g) and NO(g)+12Br2(g)⇌NOBr(g) are 0.36×1030 and 1.8 respectively:

What is the charge of magnesium ion in MgCl2?

For the process: H2O(l) (1 bar, 373 K)⇌H2O(g) (1 bar, 373 K) the correct set of thermodynamic parameters is:

The atomic radius of Ag is closest to:

Which of the following compounds exhibits stereoisomerism?

Which of the following is least thermally stable?

Justify the given statement with suitable examples "the properties of the elements are a periodic function of their atomic numbers".

Which of the following alcohols will yield the corresponding alkyl chloride on reaction with concentrated HCl at room temperature?

What are enzyme inhibitors ? Classify them on the basis of their mode of attachments on the active site of enzymes. With the help of diagrams explain how do inhibitors inhibit the enzymatic activity.

At the isoelectric point for amino acid, the species present are:

Which of the following statement(s) is/are correct?

When Ph−OH reacts with C2H5I with anhydrous C2H5OH as the solvent in the presence of ethoxide ions, what is the product of this reaction?

The diameter of zinc atom is 2.6 A. Calculate (a) radius of zinc atom in pm and (b) number of atoms present in a length of 1.6 cm if the zinc atoms are arranged side by side lengthwise.

Find the quantum number ′n′ corresponding to the state of He+ ion, if on transition to the ground state that ion emits two photons in succession with wavelength 108.5 and 30.4 nm (take RH=1.09×105 cm−1)

The value of ∫ax2−bx√c2x2−(ax2+b)2dx is equal to