46295 + Interview Questions in Chemistry

1.	when the surface of the metal is irradiated by applying the radiation of wavelength 400A, the ejected electron travels with KE\:two third of the incident energy. find the stopping potential of the photoelectron ejected
Answer» when the surface of the metal is irradiated by applying the radiation of wavelength 400A, the ejected electron travels with KE\:two third of the incident energy. find the stopping potential of the photoelectron ejected

Discussion

2.	how to convert amine to aldehyde?
Answer» how to convert amine to aldehyde?

Discussion

3.	ques . Calcium carbide produces acetylene on reaction with water . ethylene can be obtained by reduction of C_2H_{2._{}}polythene is produced by polymerisation of C_2H_4. Calculate the theoretical yeild of polythene per ki\log ram of CaC_2. (a)0.6457Kg (b)0.4375Kg (c)0.5113Kg (d)0.3948k
Answer» ques . Calcium carbide produces acetylene on reaction with water . ethylene can be obtained by reduction of C_2H_{2._{}}polythene is produced by polymerisation of C_2H_4. Calculate the theoretical yeild of polythene per ki\log ram of CaC_2. (a)0.6457Kg (b)0.4375Kg (c)0.5113Kg (d)0.3948k

Discussion

4.	25ml of 3.0N HCl and 75ml of 0.05N HCl when mixed together, the normality of the resulting solution is
Answer» 25ml of 3.0N HCl and 75ml of 0.05N HCl when mixed together, the normality of the resulting solution is

Discussion

5.	Partial reduction of A is selectively done using :
Answer» Partial reduction of A is selectively done using :

Discussion

6.	what is the difference between nucleophile and base ? which among oH^- and SH^- is better nuleophile or base ?
Answer» what is the difference between nucleophile and base ? which among oH^- and SH^- is better nuleophile or base ?

Discussion

7.	what is the formula of a polypeptide consisting of 10 glycine molecules?The formula of glycine is C2H5O2N.Options:1)C6H12ON 2)C20H32O11N10 3)C30H16O6N5 4)C20H50O20N1
Answer» what is the formula of a polypeptide consisting of 10 glycine molecules?The formula of glycine is C2H5O2N.Options:1)C6H12ON 2)C20H32O11N10 3)C30H16O6N5 4)C20H50O20N1

Discussion

8.	n -heptane V2O3(or)Cr2O3−−−−−−−−−→773K Hydrocarbon (A). In this reaction the compund 'A' and the process called are
Answer» n -heptane $V_{2} O_{3} (o r) C r_{2} O_{3} - -------- \to 773 K$ Hydrocarbon (A). In this reaction the compund 'A' and the process called are

Discussion

9.	Why cryolite is added to purified bauxite before electrolysis
Answer» Why cryolite is added to purified bauxite before electrolysis

Discussion

10.	For 1st order reaction A→ Product , the rate of reaction at \begin{bmatrix}A\end{bmatrix}=0.2 M is 1X10^{-3} mol /lLs. when will it be 75% completed?
Answer» For 1st order reaction A→ Product , the rate of reaction at \begin{bmatrix}A\end{bmatrix}=0.2 M is 1X10^{-3} mol /lLs. when will it be 75% completed?

Discussion

11.	47. If molality of methanol in water is 5 then the masse,percentage of methanol in the solution is(2) 105%(4) 27.2%(1) 21.5%) 13.8%
Answer» 47. If molality of methanol in water is 5 then the masse,percentage of methanol in the solution is(2) 105%(4) 27.2%(1) 21.5%) 13.8%

Discussion

12.	Carbocations showing aromatic behaviour are exceptionally more stable. But why not phenyl carbocations ( which is highly unstable - do not exist )
Answer» Carbocations showing aromatic behaviour are exceptionally more stable. But why not phenyl carbocations ( which is highly unstable - do not exist )

Discussion

13.	In the nitration of benzene using the nitration mixture of acids, the electrophile is:
Answer» In the nitration of benzene using the nitration mixture of acids, the electrophile is:

Discussion

14.	The shape of covalent molecule MX3 is
Answer» The shape of covalent molecule $M X_{3}$ is

Discussion

15.	Calculate the number of ozone molecules and number of oxygen atoms in 16gram ozone
Answer» Calculate the number of ozone molecules and number of oxygen atoms in 16gram ozone

Discussion

16.	How many s,p ,d and f block elements are present in periodic table ?
Answer» How many s,p ,d and f block elements are present in periodic table ?

Discussion

17.	in wacker oxidation of ethene the product formed is
Answer» in wacker oxidation of ethene the product formed is

Discussion

18.	A compound is treated with NaNH2 to give sodium salt. Identify the compound.
Answer» A compound is treated with $N a N H_{2}$ to give sodium salt. Identify the compound.

Discussion

19.	Arrange Zn, Pb and Al in the increasing order of their reducing powers under standard conditions.Given: E0Zn2+\|Zn=−0.76V,E0Pb2+\|Pb=−0.13VE0Al3+\|Al=−1.66V
Answer» Arrange $Z n$ , $P b$ and $A l$ in the increasing order of their reducing powers under standard conditions. Given: $E_{Z n^{2 +} \| Z n}^{0} = - 0.76 V, E_{P b^{2 +} \| P b}^{0} = - 0.13 V$ $E_{A l^{3 +} \| A l}^{0} = - 1.66 V$

Discussion

20.	Concentrated aqueous sulphuric acid is 98% H2SO4 by mass and has a density of 1.80 g /mL.Volume of acid required to make one litre of 0.1M H2SO4 solution will be??
Answer» Concentrated aqueous sulphuric acid is 98% H2SO4 by mass and has a density of 1.80 g /mL.Volume of acid required to make one litre of 0.1M H2SO4 solution will be??

Discussion

21.	The correct order of bond angles (smallest first) in H2S, NH3, BF3 and SiH4 is-
Answer» The correct order of bond angles (smallest first) in $H_{2} S, N H_{3}, B F_{3}$ and $S i H_{4}$ is-

Discussion

22.	From B2H6, the following can be prepared, except for:
Answer» From $B_{2} H_{6}$ , the following can be prepared, except for:

Discussion

23.	EMF of cell (E∘cell)=
Answer» EMF of cell $(E_{c e l l}^{\circ}) =$

Discussion

24.	A cat on the mat.
Answer» A cat on the mat.

Discussion

25.	An open glass tube is immersed in mercury in such a way that a length of 8 cm extends above the mercury level. The open end of the tube is then closed and sealed and the tube is raised vertically up by an additional 46 cm. What will be length of the air column above mercury in the tube now?[Atmospheric pressure =76 cm of Hg and assume temperature is constant]
Answer» An open glass tube is immersed in mercury in such a way that a length of $8 cm$ extends above the mercury level. The open end of the tube is then closed and sealed and the tube is raised vertically up by an additional $46 cm$ . What will be length of the air column above mercury in the tube now? [Atmospheric pressure $= 76 cm of Hg$ and assume temperature is constant]

Discussion

26.	Draw structures of the following:(1) H4P2O7
Answer» Draw structures of the following: (1) H4P2O7

Discussion

27.	Which of the following options will be correct for the stage of half completionof the reaction A ⇌ B(i) ∆Gᶱ= 0(ii) ∆Gᶱ > 0(iii) ∆Gᶱ< 0(iv) ∆Gᶱ= –RT ln2.
Answer» Which of the following options will be correct for the stage of half completion of the reaction A ⇌ B (i) ∆Gᶱ= 0 (ii) ∆Gᶱ > 0 (iii) ∆Gᶱ< 0 (iv) ∆Gᶱ= –RT ln2.

Discussion

28.	If any solute 'A' dimerises in water at 1 atmpressure and the boiling point of this solution is100.52^° C. If 2 moles of A is added to 1 kg of waterand K for water is 0.52^° C/molal, calculate thepercentage association of A(1) 50%(2) 30%(3) 25%(4) 100%
Answer» If any solute 'A' dimerises in water at 1 atmpressure and the boiling point of this solution is100.52^° C. If 2 moles of A is added to 1 kg of waterand K for water is 0.52^° C/molal, calculate thepercentage association of A(1) 50%(2) 30%(3) 25%(4) 100%

Discussion

29.	Which statement is false? A sigma molecular orbital
Answer» Which statement is false? A sigma molecular orbital

Discussion

30.	During collision of two particles should horizontal component (X component) of velocity should be equal in projectile relative motion
Answer» During collision of two particles should horizontal component (X component) of velocity should be equal in projectile relative motion

Discussion

31.	The Scientist who helped in Green Revolution in India is _______
Answer» The Scientist who helped in Green Revolution in India is _______

Discussion

32.	in predicting the formulae of compound why we are taking cubical unit cell and not other.
Answer» in predicting the formulae of compound why we are taking cubical unit cell and not other.

Discussion

33.	Assertion (A) IUPAC name of the compund CH3−CH\|CH3−O−CH2−CH2−CH3 is 2-ethoxy-2-methylethane Reason (R) In IUPAC nomenclature, ether is regarded as hydrocarbon derivative in which a hydrogen atom is replaced by - OR or - 0AR group [where, R = alkyl group and Ar = aryl group]. (a) Assertion and reason both are correct and reason is correct explanation of assertion. (b) Assertion and reason both are wrong statements. (c) Assertion is correct statement but reason is wrong statement. (d) Assertion is wrong statement but reason is correct statement. (e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.
Answer» Assertion (A) IUPAC name of the compund $C H_{3} - C H \| C H_{3} - O - C H_{2} - C H_{2} - C H_{3}$ is 2-ethoxy-2-methylethane Reason (R) In IUPAC nomenclature, ether is regarded as hydrocarbon derivative in which a hydrogen atom is replaced by - OR or - 0AR group [where, R = alkyl group and Ar = aryl group]. (a) Assertion and reason both are correct and reason is correct explanation of assertion. (b) Assertion and reason both are wrong statements. (c) Assertion is correct statement but reason is wrong statement. (d) Assertion is wrong statement but reason is correct statement. (e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

Discussion

34.	3. How many resonating structure possible in phenol and why?
Answer» 3. How many resonating structure possible in phenol and why?

Discussion

35.	Major difference in structure between Anisotrphic and Isotrophic
Answer» Major difference in structure between Anisotrphic and Isotrophic

Discussion

36.	a; M formic acid solution is titrated against a;M Sodium hydroxide solution. What would be the difference in pH between 1/5 and4/5 stages of neutralisation of acid. a) 2log3/4. b) 2log4
Answer» a; M formic acid solution is titrated against a;M Sodium hydroxide solution. What would be the difference in pH between 1/5 and4/5 stages of neutralisation of acid. a) 2log3/4. b) 2log4

Discussion

37.	In which of the following reactions ΔH is equal to ΔU?
Answer» In which of the following reactions $Δ H$ is equal to $Δ U$ ?

Discussion

38.	one mole of N2O4 at 300K is kept in closed container under one atmosphere .it is heated to600K when 20% by mass of N2O4 gas decomposes to NO2 gas the resul†an t pressure i
Answer» one mole of N2O4 at 300K is kept in closed container under one atmosphere .it is heated to600K when 20% by mass of N2O4 gas decomposes to NO2 gas the resul†an t pressure i

Discussion

39.	(1) & (2) represent what kind of processes?
Answer» (1) & (2) represent what kind of processes?

Discussion

40.	36. If the molar mass of alum is M, then the equivalent weight is________?
Answer» 36. If the molar mass of alum is M, then the equivalent weight is________?

Discussion

41.	Question 49Name the reaction which is commonly used in the conversion of vegetable oils to fats. Explain the reaction involved in detail.
Answer» Question 49 Name the reaction which is commonly used in the conversion of vegetable oils to fats. Explain the reaction involved in detail.

Discussion

42.	The complex showing a spin only magnetic moment of 2.82 BM is:
Answer» The complex showing a spin only magnetic moment of $2.82$ BM is:

Discussion

43.	The correct order of ionization enthalpy of B , C , O and N i
Answer» The correct order of ionization enthalpy of B , C , O and N i

Discussion

44.	A function f:R−{β}→R, where β=3±√9+8α8, is defined by f(x)=αx2+6x−8α+6x−8x2. Then the possible value(s) of α for which f is onto.
Answer» A function $f : R - {β} \to R,$ where $β = \frac{3 \pm \sqrt{9 + 8 α}}{8},$ is defined by $f (x) = \frac{α x^{2} + 6 x - 8}{α + 6 x - 8 x^{2}}$ . Then the possible value(s) of $α$ for which $f$ is onto.

Discussion

45.	12.5 ml of 0.05 M SeO2 reacts with 25 ml of 0.1 M CrSO4 which is oxidised to Cr3+. To what oxidation state was the selenium converted by the reaction?
Answer» 12.5 ml of 0.05 M $S e O_{2}$ reacts with 25 ml of 0.1 M $C r S O_{4}$ which is oxidised to $C r^{3 +}$ . To what oxidation state was the selenium converted by the reaction?

Discussion

46.	A first order reaction is 50% completed in 40 minutes at 300 K and in 20 minutes at 320 K. Calculate the activation energy of the reaction. (Given : log 2 = 0.3010, log 4 = 0.6021, R = 8.314 JK−1 mol−1)
Answer» A first order reaction is 50% completed in 40 minutes at 300 K and in 20 minutes at 320 K. Calculate the activation energy of the reaction. (Given : log 2 = 0.3010, log 4 = 0.6021, R = 8.314 $J K^{- 1} m o l^{- 1})$

Discussion

47.	Theionization constant of chloroacetic acid is 1.35 × 10–3.What will be the pH of 0.1M acid and its 0.1M sodium salt solution?
Answer» The ionization constant of chloroacetic acid is 1.35 × 10^–3. What will be the pH of 0.1M acid and its 0.1M sodium salt solution?

Discussion

48.	Acidic strenght of :- H_2S_2O_{7 } & H_2S_2O_8
Answer» Acidic strenght of :- H_2S_2O_{7 } & H_2S_2O_8

Discussion

49.	Which of the following sets of reactants is used for preparation of paracetamol from phenol?
Answer» Which of the following sets of reactants is used for preparation of paracetamol from phenol?

Discussion

50.	A certain sample of cuprous sulphide is found to have a composition Cu_{1.8}S,because of presence of some Cu^{2+}ions in the lattice.What is the mole % of Cu^{2+}in crystal?Provide a detail solution with step 1)99.8% 2)11.11% 3)88.88% 4)None
Answer» A certain sample of cuprous sulphide is found to have a composition Cu_{1.8}S,because of presence of some Cu^{2+}ions in the lattice.What is the mole % of Cu^{2+}in crystal?Provide a detail solution with step 1)99.8% 2)11.11% 3)88.88% 4)None

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

when the surface of the metal is irradiated by applying the radiation of wavelength 400A, the ejected electron travels with KE\:two third of the incident energy. find the stopping potential of the photoelectron ejected

how to convert amine to aldehyde?

ques . Calcium carbide produces acetylene on reaction with water . ethylene can be obtained by reduction of C_2H_{2._{}}polythene is produced by polymerisation of C_2H_4. Calculate the theoretical yeild of polythene per ki\log ram of CaC_2. (a)0.6457Kg (b)0.4375Kg (c)0.5113Kg (d)0.3948k

25ml of 3.0N HCl and 75ml of 0.05N HCl when mixed together, the normality of the resulting solution is

Partial reduction of A is selectively done using :

what is the difference between nucleophile and base ? which among oH^- and SH^- is better nuleophile or base ?

what is the formula of a polypeptide consisting of 10 glycine molecules?The formula of glycine is C2H5O2N.Options:1)C6H12ON 2)C20H32O11N10 3)C30H16O6N5 4)C20H50O20N1

n -heptane V2O3(or)Cr2O3−−−−−−−−−→773K Hydrocarbon (A). In this reaction the compund 'A' and the process called are

Why cryolite is added to purified bauxite before electrolysis

For 1st order reaction A→ Product , the rate of reaction at \begin{bmatrix}A\end{bmatrix}=0.2 M is 1X10^{-3} mol /lLs. when will it be 75% completed?

47. If molality of methanol in water is 5 then the masse,percentage of methanol in the solution is(2) 105%(4) 27.2%(1) 21.5%) 13.8%

Carbocations showing aromatic behaviour are exceptionally more stable. But why not phenyl carbocations ( which is highly unstable - do not exist )

In the nitration of benzene using the nitration mixture of acids, the electrophile is:

The shape of covalent molecule MX3 is

Calculate the number of ozone molecules and number of oxygen atoms in 16gram ozone

How many s,p ,d and f block elements are present in periodic table ?

in wacker oxidation of ethene the product formed is

A compound is treated with NaNH2 to give sodium salt. Identify the compound.

Arrange Zn, Pb and Al in the increasing order of their reducing powers under standard conditions.Given: E0Zn2+|Zn=−0.76V,E0Pb2+|Pb=−0.13VE0Al3+|Al=−1.66V

Concentrated aqueous sulphuric acid is 98% H2SO4 by mass and has a density of 1.80 g /mL.Volume of acid required to make one litre of 0.1M H2SO4 solution will be??

The correct order of bond angles (smallest first) in H2S, NH3, BF3 and SiH4 is-

From B2H6, the following can be prepared, except for:

EMF of cell (E∘cell)=

A cat on the mat.

Draw structures of the following:(1) H4P2O7

Which of the following options will be correct for the stage of half completionof the reaction A ⇌ B(i) ∆Gᶱ= 0(ii) ∆Gᶱ > 0(iii) ∆Gᶱ< 0(iv) ∆Gᶱ= –RT ln2.

If any solute 'A' dimerises in water at 1 atmpressure and the boiling point of this solution is100.52^° C. If 2 moles of A is added to 1 kg of waterand K for water is 0.52^° C/molal, calculate thepercentage association of A(1) 50%(2) 30%(3) 25%(4) 100%

Which statement is false? A sigma molecular orbital

During collision of two particles should horizontal component (X component) of velocity should be equal in projectile relative motion

The Scientist who helped in Green Revolution in India is _______

in predicting the formulae of compound why we are taking cubical unit cell and not other.

3. How many resonating structure possible in phenol and why?

Major difference in structure between Anisotrphic and Isotrophic

a; M formic acid solution is titrated against a;M Sodium hydroxide solution. What would be the difference in pH between 1/5 and4/5 stages of neutralisation of acid. a) 2log3/4. b) 2log4

In which of the following reactions ΔH is equal to ΔU?

one mole of N2O4 at 300K is kept in closed container under one atmosphere .it is heated to600K when 20% by mass of N2O4 gas decomposes to NO2 gas the resul†an t pressure i

(1) & (2) represent what kind of processes?

36. If the molar mass of alum is M, then the equivalent weight is________?

Question 49Name the reaction which is commonly used in the conversion of vegetable oils to fats. Explain the reaction involved in detail.

The complex showing a spin only magnetic moment of 2.82 BM is:

The correct order of ionization enthalpy of B , C , O and N i

A function f:R−{β}→R, where β=3±√9+8α8, is defined by f(x)=αx2+6x−8α+6x−8x2. Then the possible value(s) of α for which f is onto.

12.5 ml of 0.05 M SeO2 reacts with 25 ml of 0.1 M CrSO4 which is oxidised to Cr3+. To what oxidation state was the selenium converted by the reaction?

A first order reaction is 50% completed in 40 minutes at 300 K and in 20 minutes at 320 K. Calculate the activation energy of the reaction. (Given : log 2 = 0.3010, log 4 = 0.6021, R = 8.314 JK−1 mol−1)

Theionization constant of chloroacetic acid is 1.35 × 10–3.What will be the pH of 0.1M acid and its 0.1M sodium salt solution?

Acidic strenght of :- H_2S_2O_{7 } & H_2S_2O_8

Which of the following sets of reactants is used for preparation of paracetamol from phenol?

A certain sample of cuprous sulphide is found to have a composition Cu_{1.8}S,because of presence of some Cu^{2+}ions in the lattice.What is the mole % of Cu^{2+}in crystal?Provide a detail solution with step 1)99.8% 2)11.11% 3)88.88% 4)None