46295 + Interview Questions in Chemistry

1.	When 22.4 litres of H2(g) is mixed with 11.2 litres of Cl2(g), each at S.T.P, the moles of HCl(g) formed is equal to :-
Answer» When 22.4 litres of $H_{2} (g)$ is mixed with 11.2 litres of $C l_{2} (g)$ , each at $S . T . P,$ the moles of $H C l (g)$ formed is equal to :-

Discussion

2.	For a reaction, A +B ➡️C. ∆H = 30kJ/mol and ∆S = 60 J/K/mol. The temperature,above which reaction will be spontaneous is
Answer» For a reaction, A +B ➡️C. ∆H = 30kJ/mol and ∆S = 60 J/K/mol. The temperature,above which reaction will be spontaneous is

Discussion

3.	Any gas is thermally described by 3 parametes P,V,T . Why n ( no. of moles) is not used to describe a gas thermally ?
Answer» Any gas is thermally described by 3 parametes P,V,T . Why n ( no. of moles) is not used to describe a gas thermally ?

Discussion

4.	The substrate of the Lossen rearrangement is
Answer» The substrate of the Lossen rearrangement is

Discussion

5.	In the Iodination of alkane, Some HIO3 is added so that :
Answer» In the Iodination of alkane, Some HIO₃ is added so that :

Discussion

6.	You have prepared a nice sample of N0 radioactive nuclei of decay constant λ, and want to show it off to your friends. When they arrive units of time later, you open the lid and find there are only ___nuclei left intact.
Answer» You have prepared a nice sample of $N_{0}$ radioactive nuclei of decay constant $λ$ , and want to show it off to your friends. When they arrive units of time later, you open the lid and find there are only ___nuclei left intact.

Discussion

7.	In the complex acetylbromidodicarbonylbis(triethylphosphine)iron(II), the number of Fe−C bond(s) is
Answer» In the complex acetylbromidodicarbonylbis(triethylphosphine)iron(II), the number of $F e - C$ bond(s) is

Discussion

8.	What is the dis†an ce of centre of mass of a half ring from centre if the ring has radius = 0.5m a) 1/pi b)1/3pi c)2/3pi d)2/pi
Answer» What is the dis†an ce of centre of mass of a half ring from centre if the ring has radius = 0.5m a) 1/pi b)1/3pi c)2/3pi d)2/pi

Discussion

9.	Hoe does filling of valence electrons take place in s block, p block and d block
Answer» Hoe does filling of valence electrons take place in s block, p block and d block

Discussion

10.	Important Iupac Rules for naming organic compound (Nomenclature)
Answer» Important Iupac Rules for naming organic compound (Nomenclature)

Discussion

11.	Of the following 0.10 m aqueous solution, which one will exhibit the largest freezing point depression?
Answer» Of the following 0.10 m aqueous solution, which one will exhibit the largest freezing point depression?

Discussion

12.	Calculate the average atomic mass of hydrogen using the following data Isotope%Natural abudanceMolar mass1H99.98512H0.0152
Answer» Calculate the average atomic mass of hydrogen using the following data $\begin{matrix} I s o t o p e & % N a t u r a l a b u d a n c e & M o l a r m a s s^{1} H & 99.985 & 1^{2} H & 0.015 & 2 \end{matrix}$

12.

Calculate the average atomic mass of hydrogen using the following data Isotope%Natural abudanceMolar mass1H99.98512H0.0152

Answer»

Calculate the average atomic mass of hydrogen using the following data

$\begin{matrix} I s o t o p e & % N a t u r a l a b u d a n c e & M o l a r m a s s^{1} H & 99.985 & 1^{2} H & 0.015 & 2 \end{matrix}$

Discussion

13.	What is the formula of displacement in nth second ?
Answer» What is the formula of displacement in nth second ?

Discussion

14.	3.2 moles of HI were cheated in a sealed bulb at 444 degree celcius fill the equilibrium was reached.It's degree of dissociation was found to be 20 percent calculate the number of moles of hydrogen iodide hydrogen and iodine present at equilibrium point and determine the value of equilibrium constant for the fraction 2HI gives H2 +I2 consider the volume of the container 1L
Answer» 3.2 moles of HI were cheated in a sealed bulb at 444 degree celcius fill the equilibrium was reached.It's degree of dissociation was found to be 20 percent calculate the number of moles of hydrogen iodide hydrogen and iodine present at equilibrium point and determine the value of equilibrium constant for the fraction 2HI gives H2 +I2 consider the volume of the container 1L

Discussion

15.	H bond is not present inGlycerolWaterH2SHF
Answer» H bond is not present in Glycerol Water H2S HF

Discussion

16.	If 1.11 g Mg2P2O7 is formed at the end of the reaction, then what weight of NaH2PO4 was present originally given that no other products contained phosphorus? (Molar mass Mg2P2O7=222 g mol−1, NaH2PO4=120 g mol−1) NaH2PO4+Mg2++NH+4→Mg(NH4)PO4.6H2O→Mg2P2O7
Answer» If 1.11 g $M g_{2} P_{2} O_{7}$ is formed at the end of the reaction, then what weight of $N a H_{2} P O_{4}$ was present originally given that no other products contained phosphorus? $(Molar mass M g_{2} P_{2} O_{7} = 222 {g mol}^{- 1}, N a H_{2} P O_{4} = 120 {g mol}^{- 1})$ $N a H_{2} P O_{4} + M g^{2 +} + N H_{4}^{+} \to M g (N H_{4}) P O_{4} .6 H_{2} O \to M g_{2} P_{2} O_{7}$

Discussion

17.	59. When we are deriving the energy formula in bohr' s atomic model we use potential energy equivalent to kq1q2/r. Why is this So?And why does potential energy have a negative value??(For monoelectronic species )
Answer» 59. When we are deriving the energy formula in bohr' s atomic model we use potential energy equivalent to kq1q2/r. Why is this So?And why does potential energy have a negative value??(For monoelectronic species )

Discussion

18.	heat of formation of ethane -20.2kcal /mol and heat of atomisation of C and H2 are 179.2kcal /mol and 52.1kcal /mol if bond energy of c-h b ond is 73.3 kcal/mol then calculate apprx b.e of C-C
Answer» heat of formation of ethane -20.2kcal /mol and heat of atomisation of C and H2 are 179.2kcal /mol and 52.1kcal /mol if bond energy of c-h b ond is 73.3 kcal/mol then calculate apprx b.e of C-C

Discussion

19.	Why is H-C-C bond angle in C2H6 is 109°28' but H-C=C bond angle in C2H4 120°? That is why does the bond angle increase?
Answer» Why is H-C-C bond angle in C2H6 is 109°28' but H-C=C bond angle in C2H4 120°? That is why does the bond angle increase?

Discussion

20.	The reaction of CH3OC2H5 with HI gives:
Answer» The reaction of $C H_{3} O C_{2} H_{5}$ with $H I$ gives:

Discussion

21.	13. Aqueous solution of COCl3/6NH3 upon addition with AgNO3 produces 3 moles white precipitate primary and secondary valency of metal in this complex is a)3,6 b)2,6 c)3,3 d)6,4
Answer» 13. Aqueous solution of COCl3/6NH3 upon addition with AgNO3 produces 3 moles white precipitate primary and secondary valency of metal in this complex is a)3,6 b)2,6 c)3,3 d)6,4

Discussion

22.	how many hydrogen bonds can a water molecule for
Answer» how many hydrogen bonds can a water molecule for

Discussion

23.	salicyclic acid with a)hno3 and gives X b)br2 water gives Y X AND Y ARE?
Answer» salicyclic acid with a)hno3 and gives X b)br2 water gives Y X AND Y ARE?

Discussion

24.	11. Due to metal deficiency defect, iron forms a non stoichiometric composition in which iron is present in +2 and +3 state. In this oxide 15percent iron is present in +3 oxidation state. The formula of oxide is
Answer» 11. Due to metal deficiency defect, iron forms a non stoichiometric composition in which iron is present in +2 and +3 state. In this oxide 15percent iron is present in +3 oxidation state. The formula of oxide is

Discussion

25.	Oxides which combine with water to form acids are called __ oxides.
Answer» Oxides which combine with water to form acids are called __ oxides.

Discussion

26.	Which of the following is Teflon[RPMT 2002]
Answer» Which of the following is Teflon [RPMT 2002]

26.

Which of the following is Teflon[RPMT 2002]

Answer»

Which of the following is Teflon

[RPMT 2002]

Discussion

27.	Which of the following is the strongest Bronsted acid?
Answer» Which of the following is the strongest Bronsted acid?

Discussion

28.	Vector a+ vector b = vector c then vector a + vector 2b =?
Answer» Vector a+ vector b = vector c then vector a + vector 2b =?

Discussion

29.	Let A=[aij] is a 3×3 diagonal matrix and k is the possible number of zeros in A. Then the sum of all possible value(s) of k is
Answer» Let $A = [a_{i j}]$ is a $3 \times 3$ diagonal matrix and $k$ is the possible number of zeros in $A$ . Then the sum of all possible value(s) of $k$ is

Discussion

30.	A metallic oxide(MO) contains 40% oxygen.Is the 40% oxygen composition by mass or by volume or by number of atoms?
Answer» A metallic oxide(MO) contains 40% oxygen. Is the 40% oxygen composition by mass or by volume or by number of atoms?

Discussion

31.	The alkene formed as a major product in the above elimination reaction is:
Answer» The alkene formed as a major product in the above elimination reaction is:

Discussion

32.	Which of the following oxidation states are the most characteristic for lead and tin respectively?
Answer» Which of the following oxidation states are the most characteristic for lead and tin respectively?

Discussion

33.	End product 'P' of the reaction will be:
Answer» End product 'P' of the reaction will be:

Discussion

34.	1.In GaCl2 the oxidation state of Ga is (1) +1 (2) +2 (3) +3 (4) Both (1) and (3)
Answer» 1.In GaCl2 the oxidation state of Ga is (1) +1 (2) +2 (3) +3 (4) Both (1) and (3)

Discussion

35.	Select the incorrect order of First ionisation enthalpy.A Pb>AnB Ge>AnC Si>HeD None of the above
Answer» Select the incorrect order of First ionisation enthalpy. A Pb>An B Ge>An C Si>He D None of the above

Discussion

36.	How all bond angles in CH4 are equal ?
Answer» How all bond angles in CH4 are equal ?

Discussion

37.	If 10mol of an ideal gas expands reversibly and isothermally from 10L to 100L at 300K, then entropy change will be-1)-191.47J/K/mol,2)191.24J/K,3)83.03J/K,4)-83.03J/K.
Answer» If 10mol of an ideal gas expands reversibly and isothermally from 10L to 100L at 300K, then entropy change will be-1)-191.47J/K/mol,2)191.24J/K,3)83.03J/K,4)-83.03J/K.

Discussion

38.	307. The number and type of bonds between two boron atoms in B2 molecule :-(1) Two sigma, two pi(2) Two sigma, one pi(3) One Pi(4) One sigma, one pi
Answer» 307. The number and type of bonds between two boron atoms in B2 molecule :- (1) Two sigma, two pi (2) Two sigma, one pi (3) One Pi (4) One sigma, one pi

Discussion

39.	'A' on reaction with excess of acyl chloride produces 'B', which is having 126 g more molar weight as compared to 'A'. Then the possible structure of 'A' is:
Answer» 'A' on reaction with excess of acyl chloride produces 'B', which is having $126$ g more molar weight as compared to 'A'. Then the possible structure of 'A' is:

Discussion

40.	What volume of HCl solution of density 1.2 g/cm^3and containing 36.5% by weight HCl, must be allowed to react wih zinc (Zn) in order to liberate 4.0 g of hydrogen?(a) 333.33 mL(d) None of these(c) 614.66 mL(b) 500 mL
Answer» What volume of HCl solution of density 1.2 g/cm^3and containing 36.5% by weight HCl, must be allowed to react wih zinc (Zn) in order to liberate 4.0 g of hydrogen?(a) 333.33 mL(d) None of these(c) 614.66 mL(b) 500 mL

Discussion

41.	A reaction having equal energies of activation for forward and reverse reaction has 1)delta S=0 2)delta H=0 3)delta G =0 4)delta s=delta H=delta G=0
Answer» A reaction having equal energies of activation for forward and reverse reaction has 1)delta S=0 2)delta H=0 3)delta G =0 4)delta s=delta H=delta G=0

Discussion

42.	Predict the product obtained by chlorination of tert – butyl bromide.
Answer» Predict the product obtained by chlorination of tert – butyl bromide.

Discussion

43.	Table of Different Catalyst or Reagent for Specific purposes used in Hydrocarbon Reaxtions.
Answer» Table of Different Catalyst or Reagent for Specific purposes used in Hydrocarbon Reaxtions.

Discussion

44.	why the freezing point of solution decrease when the solute is added?
Answer» why the freezing point of solution decrease when the solute is added?

Discussion

45.	The vapour pressure of a liquid at 500 K is 150 torr. The vapour pressure in torr, at 1000 K if the enthalpy of vapourisation of the substance is 4.157 k J mol−1. (Given e 0.5=1.65) is
Answer» The vapour pressure of a liquid at $500 K$ is $150 torr$ . The vapour pressure in torr, at $1000 K$ if the enthalpy of vapourisation of the substance is $4.157 {k J mol}^{- 1}$ . (Given $e^{0.5} = 1.65$ ) is

Discussion

46.	Which of the following is not an example of unsymmetrical or mixed ether?
Answer» Which of the following is not an example of unsymmetrical or mixed ether?

Discussion

47.	why s orbital shows least screening effec
Answer» why s orbital shows least screening effec

Discussion

48.	A 3p orbital has(1) Two peaks on a plot of 4r2R2 v/s r(2) Three spherical nodes(3) Total nodes only one(4) Two nodal planes
Answer» A 3p orbital has (1) Two peaks on a plot of 4r2R2 v/s r (2) Three spherical nodes (3) Total nodes only one (4) Two nodal planes

Discussion

49.	Find the temperature (in K) at which 3 moles of SO2 will occupy a volume of 10 L at a pressure of 15 atm. [ a=6.71 atm litre2 mol−2; b=0.0564 litre mol−1]
Answer» Find the temperature ( $in K$ ) at which 3 moles of $S O_{2}$ will occupy a volume of $10 L$ at a pressure of $15 atm$ . [ $a = 6.71 {atm litre}^{2} {mol}^{- 2}$ ; $b = 0.0564 {litre mol}^{- 1}$ ]

Discussion

50.	A mixture of 2 moles of helium gas (atomic mass = 4u), and 1 mole of argon gas (atomic mass = 40u) is kept at 300 K in a container. The ratio of their RMS speeds [vrms(helium)vrms(argon)] is close to:
Answer» A mixture of $2$ moles of helium gas $(atomic mass = 4u)$ , and $1$ mole of argon gas $(atomic mass = 40u)$ is kept at $300 K$ in a container. The ratio of their $R M S$ speeds $[\frac{v_{rms} (helium)}{v_{rms} (argon)}]$ is close to:

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

When 22.4 litres of H2(g) is mixed with 11.2 litres of Cl2(g), each at S.T.P, the moles of HCl(g) formed is equal to :-

For a reaction, A +B ➡️C. ∆H = 30kJ/mol and ∆S = 60 J/K/mol. The temperature,above which reaction will be spontaneous is

Any gas is thermally described by 3 parametes P,V,T . Why n ( no. of moles) is not used to describe a gas thermally ?

The substrate of the Lossen rearrangement is

In the Iodination of alkane, Some HIO3 is added so that :

You have prepared a nice sample of N0 radioactive nuclei of decay constant λ, and want to show it off to your friends. When they arrive units of time later, you open the lid and find there are only ___nuclei left intact.

In the complex acetylbromidodicarbonylbis(triethylphosphine)iron(II), the number of Fe−C bond(s) is

What is the dis†an ce of centre of mass of a half ring from centre if the ring has radius = 0.5m a) 1/pi b)1/3pi c)2/3pi d)2/pi

Hoe does filling of valence electrons take place in s block, p block and d block

Important Iupac Rules for naming organic compound (Nomenclature)

Of the following 0.10 m aqueous solution, which one will exhibit the largest freezing point depression?

Calculate the average atomic mass of hydrogen using the following data Isotope%Natural abudanceMolar mass1H99.98512H0.0152

What is the formula of displacement in nth second ?

H bond is not present inGlycerolWaterH2SHF

If 1.11 g Mg2P2O7 is formed at the end of the reaction, then what weight of NaH2PO4 was present originally given that no other products contained phosphorus? (Molar mass Mg2P2O7=222 g mol−1, NaH2PO4=120 g mol−1) NaH2PO4+Mg2++NH+4→Mg(NH4)PO4.6H2O→Mg2P2O7

59. When we are deriving the energy formula in bohr' s atomic model we use potential energy equivalent to kq1q2/r. Why is this So?And why does potential energy have a negative value??(For monoelectronic species )

heat of formation of ethane -20.2kcal /mol and heat of atomisation of C and H2 are 179.2kcal /mol and 52.1kcal /mol if bond energy of c-h b ond is 73.3 kcal/mol then calculate apprx b.e of C-C

Why is H-C-C bond angle in C2H6 is 109°28' but H-C=C bond angle in C2H4 120°? That is why does the bond angle increase?

The reaction of CH3OC2H5 with HI gives:

13. Aqueous solution of COCl3/6NH3 upon addition with AgNO3 produces 3 moles white precipitate primary and secondary valency of metal in this complex is a)3,6 b)2,6 c)3,3 d)6,4

how many hydrogen bonds can a water molecule for

salicyclic acid with a)hno3 and gives X b)br2 water gives Y X AND Y ARE?

11. Due to metal deficiency defect, iron forms a non stoichiometric composition in which iron is present in +2 and +3 state. In this oxide 15percent iron is present in +3 oxidation state. The formula of oxide is

Oxides which combine with water to form acids are called __ oxides.

Which of the following is Teflon[RPMT 2002]

Which of the following is the strongest Bronsted acid?

Vector a+ vector b = vector c then vector a + vector 2b =?

Let A=[aij] is a 3×3 diagonal matrix and k is the possible number of zeros in A. Then the sum of all possible value(s) of k is

A metallic oxide(MO) contains 40% oxygen.Is the 40% oxygen composition by mass or by volume or by number of atoms?

The alkene formed as a major product in the above elimination reaction is:

Which of the following oxidation states are the most characteristic for lead and tin respectively?

End product 'P' of the reaction will be:

1.In GaCl2 the oxidation state of Ga is (1) +1 (2) +2 (3) +3 (4) Both (1) and (3)

Select the incorrect order of First ionisation enthalpy.A Pb>AnB Ge>AnC Si>HeD None of the above

How all bond angles in CH4 are equal ?

If 10mol of an ideal gas expands reversibly and isothermally from 10L to 100L at 300K, then entropy change will be-1)-191.47J/K/mol,2)191.24J/K,3)83.03J/K,4)-83.03J/K.

307. The number and type of bonds between two boron atoms in B2 molecule :-(1) Two sigma, two pi(2) Two sigma, one pi(3) One Pi(4) One sigma, one pi

'A' on reaction with excess of acyl chloride produces 'B', which is having 126 g more molar weight as compared to 'A'. Then the possible structure of 'A' is:

What volume of HCl solution of density 1.2 g/cm^3and containing 36.5% by weight HCl, must be allowed to react wih zinc (Zn) in order to liberate 4.0 g of hydrogen?(a) 333.33 mL(d) None of these(c) 614.66 mL(b) 500 mL

A reaction having equal energies of activation for forward and reverse reaction has 1)delta S=0 2)delta H=0 3)delta G =0 4)delta s=delta H=delta G=0

Predict the product obtained by chlorination of tert – butyl bromide.

Table of Different Catalyst or Reagent for Specific purposes used in Hydrocarbon Reaxtions.

why the freezing point of solution decrease when the solute is added?

The vapour pressure of a liquid at 500 K is 150 torr. The vapour pressure in torr, at 1000 K if the enthalpy of vapourisation of the substance is 4.157 k J mol−1. (Given e 0.5=1.65) is

Which of the following is not an example of unsymmetrical or mixed ether?

why s orbital shows least screening effec

A 3p orbital has(1) Two peaks on a plot of 4r2R2 v/s r(2) Three spherical nodes(3) Total nodes only one(4) Two nodal planes

Find the temperature (in K) at which 3 moles of SO2 will occupy a volume of 10 L at a pressure of 15 atm. [ a=6.71 atm litre2 mol−2; b=0.0564 litre mol−1]

A mixture of 2 moles of helium gas (atomic mass = 4u), and 1 mole of argon gas (atomic mass = 40u) is kept at 300 K in a container. The ratio of their RMS speeds [vrms(helium)vrms(argon)] is close to: