46295 + Interview Questions in Chemistry

1.	How to find the set of quantum numbers for a specified nth electron of an atom?
Answer» How to find the set of quantum numbers for a specified nth electron of an atom?

Discussion

2.	According to the law of equivalence, the number of gram equivalents of each reactant and product in a reaction are equal. Why is this the case?
Answer» According to the law of equivalence, the number of gram equivalents of each reactant and product in a reaction are equal. Why is this the case?

Discussion

3.	An aqueous solution containing 0.10 g KIO3 (formula weight =214.0 g/mol) was treated with an excess of KI solution. The solution was acidified with HCl. The liberated I2 consumed 55 mL of thiosulphate solution to decolourise the blue starch-iodine complex. Calculate molarity of the sodium thiosulphate solution.
Answer» An aqueous solution containing $0.10 g K I O_{3} (formula weight = 214.0 g / m o l)$ was treated with an excess of $K I$ solution. The solution was acidified with $H C l .$ The liberated $I_{2}$ consumed $55 m L$ of thiosulphate solution to decolourise the blue starch-iodine complex. Calculate molarity of the sodium thiosulphate solution.

Discussion

4.	Two moles of an ideal gas (Cv=52R) was compressed adiabatically against constant pressure of 4 atm . Which was initially at 350 K and 1 atm pressure. The work involve in the process is equal to
Answer» Two moles of an ideal gas $(C_{v} = \frac{5}{2} R)$ was compressed adiabatically against constant pressure of $4 a t m$ . Which was initially at $350 K$ and $1 a t m$ pressure. The work involve in the process is equal to

Discussion

5.	The oxidation state of Cu and Fe in CuFeS2 are ________ and _________ respectively
Answer» The oxidation state of Cu and Fe in $C u F e S_{2}$ are ________ and _________ respectively

Discussion

6.	The time for half-life period of a certain reaction A→products is 1 hour. When the initial concentration of the reactant A is 2.0 mol L−1, how much time does it take for its concentration to come from 0.50 to 0.25 mol L−1 if it is a zero-order reaction?
Answer» The time for half-life period of a certain reaction $A \to$ products is 1 hour. When the initial concentration of the reactant A is $2.0 {mol L}^{- 1}$ , how much time does it take for its concentration to come from $0.50 to 0.25 {mol L}^{- 1}$ if it is a zero-order reaction?

Discussion

7.	Which of these do not reflect the periodicity of the elements?
Answer» Which of these do not reflect the periodicity of the elements?

7.

Which of these do not reflect the periodicity of the elements?

Answer»

Which of these do not reflect the periodicity of the elements?

Discussion

8.	Order for increasing ionic character among BeCl2 and Mgcl2 and Cacl2 and Bacl2
Answer» Order for increasing ionic character among BeCl2 and Mgcl2 and Cacl2 and Bacl2

Discussion

9.	Why don't elements of group 16 other than O exhibit +1 oxidation state? Why does S2F2 not exist?
Answer» Why don't elements of group 16 other than O exhibit +1 oxidation state? Why does S2F2 not exist?

Discussion

10.	In a collection of H-atoms, all the electrons jump from n=5 to the ground level (directly or indirectly) without emitting any line in the Balmer series. The number of different possible radiations is:
Answer» In a collection of H-atoms, all the electrons jump from $n = 5$ to the ground level (directly or indirectly) without emitting any line in the Balmer series. The number of different possible radiations is:

Discussion

11.	What is coordinate pi bond ? How to identify back bonds and compare their strength ?
Answer» What is coordinate pi bond ? How to identify back bonds and compare their strength ?

Discussion

12.	In which of the following has the average oxidation number of oxygen been arranged in increasing order ?
Answer» In which of the following has the average oxidation number of oxygen been arranged in increasing order ?

Discussion

13.	ntmolarity and normality of a solution of sodium carbonate are not same why?n
Answer» ntmolarity and normality of a solution of sodium carbonate are not same why?n

Discussion

14.	which compounds give yellow ppt with AgNO3
Answer» which compounds give yellow ppt with AgNO3

Discussion

15.	166. Consider the half-cell reaction0_2(g) 4H^+ (aq) + 4e^-→ 2H_20By what factor are n, Q, E and Eo changed if all thestoichiometric coefficients are multiplied by thefactor two
Answer» 166. Consider the half-cell reaction0_2(g) 4H^+ (aq) + 4e^-→ 2H_20By what factor are n, Q, E and Eo changed if all thestoichiometric coefficients are multiplied by thefactor two

Discussion

16.	Find the missing terms.a. Na + NaClb. + O2 → CaO
Answer» Find the missing terms. a. Na + NaCl b. + $O_{2}$ → CaO

Discussion

17.	Which of the following carbocations is least stable?
Answer» Which of the following carbocations is least stable?

Discussion

18.	Among the following if the number of linear molecules are x and the number of angular molecules are y. Then the value of x/y would be O3.N2O,NO2,SO2,CO2,SnCl2,Cl2O,HCN,+NO2
Answer» Among the following if the number of linear molecules are x and the number of angular molecules are y. Then the value of x/y would be $O_{3} . N_{2} O, N O_{2}, S O_{2}, C O_{2}, S n C l_{2}, C l_{2} O, H C N, + N O_{2}$

Discussion

19.	1% solution of Ca(NO3)2 has freezing point:
Answer» 1% solution of Ca(NO₃)₂ has freezing point:

Discussion

20.	Which of the following is arranged in an increasing order of hydration energy?
Answer» Which of the following is arranged in an increasing order of hydration energy?

Discussion

21.	21.he no. of O-atoms required to combine with 7 g. nitrogen to form N2O3 if 80% of N2 is converted into products??
Answer» 21.he no. of O-atoms required to combine with 7 g. nitrogen to form N2O3 if 80% of N2 is converted into products??

Discussion

22.	explain the jj thomson discharge tube experiment
Answer» explain the jj thomson discharge tube experiment

Discussion

23.	18. Why does the melting and boiling point of water is affect by addition of impurities.
Answer» 18. Why does the melting and boiling point of water is affect by addition of impurities.

Discussion

24.	When do we add the concentration of water while calculating ph of acid/base.is it only when the concentration is above 10^-7 or when it is below that too?
Answer» When do we add the concentration of water while calculating ph of acid/base.is it only when the concentration is above 10^-7 or when it is below that too?

Discussion

25.	Assuming that the Pauli exclusion principle is non-existent, which of the following will be the most acceptable configuration of Li in the ground state?
Answer» Assuming that the Pauli exclusion principle is non-existent, which of the following will be the most acceptable configuration of Li in the ground state?

Discussion

26.	ntIn which of the following pairs the ionisation energy of the first species is less than that of the secondn nt1. N,Pn nt2. Be+,Ben nt3. N,N-n nt4. Ne, Ne+n
Answer» ntIn which of the following pairs the ionisation energy of the first species is less than that of the secondn nt1. N,Pn nt2. Be+,Ben nt3. N,N-n nt4. Ne, Ne+n

Discussion

27.	What is integration of numbers
Answer» What is integration of numbers

Discussion

28.	35. Among the following which one is not paramagnetic?(Atomic no. Be=4, Ne=10, As=33, Cl=17) (1) Ne2+ (2) Be+ (3) Cl- (4) As+
Answer» 35. Among the following which one is not paramagnetic?(Atomic no. Be=4, Ne=10, As=33, Cl=17) (1) Ne2+ (2) Be+ (3) Cl- (4) As+

Discussion

29.	The dimensions of RC is
Answer» The dimensions of RC is

Discussion

30.	Of the following 0.1M aqueous solutions, the one with lowest freezing point is:
Answer» Of the following 0.1M aqueous solutions, the one with lowest freezing point is:

Discussion

31.	Which of the following pairs of salts will have the same relation between solubility product (Ksp) and solubility (s)?
Answer» Which of the following pairs of salts will have the same relation between solubility product $(K_{s p})$ and solubility (s)?

Discussion

32.	The geometrical isomerism is not shown by:
Answer» The geometrical isomerism is not shown by:

Discussion

33.	Explain the relationship between CFC's and ozone in the stratosphere. [2]
Answer» Explain the relationship between CFC's and ozone in the stratosphere. [2]

Discussion

34.	The correct order of the decreasing ionic radii among the following isoelectric species is :
Answer» The correct order of the decreasing ionic radii among the following isoelectric species is :

Discussion

35.	Balls collide as shown in the figure. In diagram 1, the condition before collision is given and in diagram 2, the condition after collision is shown. Then which of the following graphs is correct?
Answer» Balls collide as shown in the figure. In diagram 1, the condition before collision is given and in diagram 2, the condition after collision is shown. Then which of the following graphs is correct?

Discussion

36.	2×10−3 M solution of NaCl having degree of disociation of 90% at 27∘C has osmotic pressure equal to :
Answer» $2 \times 10^{- 3} M$ solution of $N a C l$ having degree of disociation of $90 %$ at $27^{\circ} C$ has osmotic pressure equal to :

Discussion

37.	what is the difference between accuracy and precise?does they occur simultaneously?
Answer» what is the difference between accuracy and precise?does they occur simultaneously?

Discussion

38.	What is number of dichloro product from cyclo pentane ?
Answer» What is number of dichloro product from cyclo pentane ?

Discussion

39.	Describe the hybridisation in case of PCl5. Why are the axial bonds longer as compared to equatorial bonds?
Answer» Describe the hybridisation in case of $P C l_{5}$ . Why are the axial bonds longer as compared to equatorial bonds?

Discussion

40.	Calculate the normality of 5.3%(w/v) solution of Na2CO3 ?
Answer» Calculate the normality of 5.3%(w/v) solution of Na2CO3 ?

Discussion

41.	Acetamide reacts with NaOBr in alkaline medium to form:
Answer» Acetamide reacts with NaOBr in alkaline medium to form:

Discussion

42.	What are the criteria of deciding the geometrical isomers in cycloalkanes?
Answer» What are the criteria of deciding the geometrical isomers in cycloalkanes?

Discussion

43.	Osmotic pressure of colloidal solution is lower than true solution of same concentration. Why?
Answer» Osmotic pressure of colloidal solution is lower than true solution of same concentration. Why?

Discussion

44.	17.Polar protic and polar aprotic solvents promote SN2 reactions when neutral and charged nucleophiles are involved in SN2 reaction. Why does this variation occur so?
Answer» 17.Polar protic and polar aprotic solvents promote SN2 reactions when neutral and charged nucleophiles are involved in SN2 reaction. Why does this variation occur so?

Discussion

45.	0.1 mol of methyl amine (Kb = 5 × 10−4) is mixed with 0.08 mol of HCl and the solution is diluted to 1 litre. The hydrogen ion concentration of the resulting solution is:
Answer» $0.1 m o l$ of methyl amine ( $K_{b}$ = $5 \times 10^{- 4}$ ) is mixed with $0.08 m o l$ of $H C l$ and the solution is diluted to $1 l i t r e$ . The hydrogen ion concentration of the resulting solution is:

Discussion

46.	A dye emits 50% of the absorbed energy as fluorescence. If the number of quanta absorbed and the emitted out are in ratio 1:4. Find the wavelength of emitted radiation if the absorbed radiation has a wavelength of x oA.
Answer» A dye emits $50 %$ of the absorbed energy as fluorescence. If the number of quanta absorbed and the emitted out are in ratio $1 : 4$ . Find the wavelength of emitted radiation if the absorbed radiation has a wavelength of $x o A$ .

Discussion

47.	5 moles of an ideal gas expand reversibly from a volume of 8 dm3 to 80 dm3 at a temperature of 27∘C. Calculate the change in entropy.
Answer» 5 moles of an ideal gas expand reversibly from a volume of 8 $d m^{3}$ to 80 $d m^{3}$ at a temperature of $27^{\circ} C$ . Calculate the change in entropy.

Discussion

48.	Set represent the correct order of second ionization potential isK>Ca>BaCa>Ba>KBa>K >CaK>Ba>Ca
Answer» Set represent the correct order of second ionization potential is K>Ca>Ba Ca>Ba>K Ba>K >Ca K>Ba>Ca

Discussion

49.	19. Which is not an exception to octet rule? a) BF3 b) Cl2O6 c) Cl2O7 d) Cl2O
Answer» 19. Which is not an exception to octet rule? a) BF3 b) Cl2O6 c) Cl2O7 d) Cl2O

Discussion

50.	Whichof the following is an appropriate set of reactants for thepreparation of 1-methoxy-4-nitrobenzene and why?(i) (ii)
Answer» Which of the following is an appropriate set of reactants for the preparation of 1-methoxy-4-nitrobenzene and why? (i) (ii)

50.

Whichof the following is an appropriate set of reactants for thepreparation of 1-methoxy-4-nitrobenzene and why?(i) (ii)

Answer»

Which
of the following is an appropriate set of reactants for the
preparation of 1-methoxy-4-nitrobenzene and why?

(i)

(ii)

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

How to find the set of quantum numbers for a specified nth electron of an atom?

According to the law of equivalence, the number of gram equivalents of each reactant and product in a reaction are equal. Why is this the case?

Two moles of an ideal gas (Cv=52R) was compressed adiabatically against constant pressure of 4 atm . Which was initially at 350 K and 1 atm pressure. The work involve in the process is equal to

The oxidation state of Cu and Fe in CuFeS2 are ________ and _________ respectively

The time for half-life period of a certain reaction A→products is 1 hour. When the initial concentration of the reactant A is 2.0 mol L−1, how much time does it take for its concentration to come from 0.50 to 0.25 mol L−1 if it is a zero-order reaction?

Which of these do not reflect the periodicity of the elements?

Order for increasing ionic character among BeCl2 and Mgcl2 and Cacl2 and Bacl2

Why don't elements of group 16 other than O exhibit +1 oxidation state? Why does S2F2 not exist?

In a collection of H-atoms, all the electrons jump from n=5 to the ground level (directly or indirectly) without emitting any line in the Balmer series. The number of different possible radiations is:

What is coordinate pi bond ? How to identify back bonds and compare their strength ?

In which of the following has the average oxidation number of oxygen been arranged in increasing order ?

ntmolarity and normality of a solution of sodium carbonate are not same why?n

which compounds give yellow ppt with AgNO3

166. Consider the half-cell reaction0_2(g) 4H^+ (aq) + 4e^-→ 2H_20By what factor are n, Q, E and Eo changed if all thestoichiometric coefficients are multiplied by thefactor two

Find the missing terms.a. Na + NaClb. + O2 → CaO

Which of the following carbocations is least stable?

Among the following if the number of linear molecules are x and the number of angular molecules are y. Then the value of x/y would be O3.N2O,NO2,SO2,CO2,SnCl2,Cl2O,HCN,+NO2

1% solution of Ca(NO3)2 has freezing point:

Which of the following is arranged in an increasing order of hydration energy?

21.he no. of O-atoms required to combine with 7 g. nitrogen to form N2O3 if 80% of N2 is converted into products??

explain the jj thomson discharge tube experiment

18. Why does the melting and boiling point of water is affect by addition of impurities.

When do we add the concentration of water while calculating ph of acid/base.is it only when the concentration is above 10^-7 or when it is below that too?

Assuming that the Pauli exclusion principle is non-existent, which of the following will be the most acceptable configuration of Li in the ground state?

ntIn which of the following pairs the ionisation energy of the first species is less than that of the secondn nt1. N,Pn nt2. Be+,Ben nt3. N,N-n nt4. Ne, Ne+n

What is integration of numbers

35. Among the following which one is not paramagnetic?(Atomic no. Be=4, Ne=10, As=33, Cl=17) (1) Ne2+ (2) Be+ (3) Cl- (4) As+

The dimensions of RC is

Of the following 0.1M aqueous solutions, the one with lowest freezing point is:

Which of the following pairs of salts will have the same relation between solubility product (Ksp) and solubility (s)?

The geometrical isomerism is not shown by:

Explain the relationship between CFC's and ozone in the stratosphere. [2]

The correct order of the decreasing ionic radii among the following isoelectric species is :

Balls collide as shown in the figure. In diagram 1, the condition before collision is given and in diagram 2, the condition after collision is shown. Then which of the following graphs is correct?

2×10−3 M solution of NaCl having degree of disociation of 90% at 27∘C has osmotic pressure equal to :

what is the difference between accuracy and precise?does they occur simultaneously?

What is number of dichloro product from cyclo pentane ?

Describe the hybridisation in case of PCl5. Why are the axial bonds longer as compared to equatorial bonds?

Calculate the normality of 5.3%(w/v) solution of Na2CO3 ?

Acetamide reacts with NaOBr in alkaline medium to form:

What are the criteria of deciding the geometrical isomers in cycloalkanes?

Osmotic pressure of colloidal solution is lower than true solution of same concentration. Why?

17.Polar protic and polar aprotic solvents promote SN2 reactions when neutral and charged nucleophiles are involved in SN2 reaction. Why does this variation occur so?

0.1 mol of methyl amine (Kb = 5 × 10−4) is mixed with 0.08 mol of HCl and the solution is diluted to 1 litre. The hydrogen ion concentration of the resulting solution is:

A dye emits 50% of the absorbed energy as fluorescence. If the number of quanta absorbed and the emitted out are in ratio 1:4. Find the wavelength of emitted radiation if the absorbed radiation has a wavelength of x oA.

5 moles of an ideal gas expand reversibly from a volume of 8 dm3 to 80 dm3 at a temperature of 27∘C. Calculate the change in entropy.

Set represent the correct order of second ionization potential isK>Ca>BaCa>Ba>KBa>K >CaK>Ba>Ca

19. Which is not an exception to octet rule? a) BF3 b) Cl2O6 c) Cl2O7 d) Cl2O

Whichof the following is an appropriate set of reactants for thepreparation of 1-methoxy-4-nitrobenzene and why?(i) (ii)

The oxidation state of Cu and Fe in CuFeS2 are and _ respectively