46295 + Interview Questions in Chemistry

1.	Explain why benzylamine has a PKB of 4.67 and pyridine has a PKB of 8.75.pyridines lp are nt involved in resonance
Answer» Explain why benzylamine has a PKB of 4.67 and pyridine has a PKB of 8.75.pyridines lp are nt involved in resonance

Discussion

2.	36. Given that bond energies of H-H and Cl-Cl are 430kJ/mol and 240 kJ/mol respectively and Enthalpy change for formation of HCl is -90kJ/mol. Bond Enthalpy of HCl(in kJ/mol)is 245 2909 380 425
Answer» 36. Given that bond energies of H-H and Cl-Cl are 430kJ/mol and 240 kJ/mol respectively and Enthalpy change for formation of HCl is -90kJ/mol. Bond Enthalpy of HCl(in kJ/mol)is 245 2909 380 425

Discussion

3.	the equivalent weight of Mnso4 is equal to it's molecular weight when converted into
Answer» the equivalent weight of Mnso4 is equal to it's molecular weight when converted into

Discussion

4.	39. Which of the following is most acidic? H2o C2H4 C2H4 NH3
Answer» 39. Which of the following is most acidic? H2o C2H4 C2H4 NH3

Discussion

5.	Which of the following is resistant to boiling aqua-regia
Answer» Which of the following is resistant to boiling aqua-regia

Discussion

6.	Why the compund with +1 oxidation state are more ionic than +3 oxidation state?!
Answer» Why the compund with +1 oxidation state are more ionic than +3 oxidation state?!

Discussion

7.	Suppose two systems X and Y are separated by adiabatic wall and both are in contact with another system Z separated by a conducting wall as shown in the figure below. Let the temperatures of the three systems be Tx, Ty and Tz . It is given that Tx= Tz and Ty = Tz then what would be the relation between Tx and Ty?
Answer» Suppose two systems X and Y are separated by adiabatic wall and both are in contact with another system Z separated by a conducting wall as shown in the figure below. Let the temperatures of the three systems be T_x, T_y and T_z . It is given that T_x= T_z and T_y= T_z then what would be the relation between T_x and T_y?

7.

Suppose two systems X and Y are separated by adiabatic wall and both are in contact with another system Z separated by a conducting wall as shown in the figure below. Let the temperatures of the three systems be Tx, Ty and Tz . It is given that Tx= Tz and Ty = Tz then what would be the relation between Tx and Ty?

Answer»

Suppose two systems X and Y are separated by adiabatic wall and both are in contact with another system Z separated by a conducting wall as shown in the figure below. Let the temperatures of the three systems be T_x, T_y and T_z . It is given that T_x= T_z and T_y= T_z then what would be the relation between T_x and T_y?

Discussion

8.	An element X has IE and EA respectively 275 and 1450 KJ mol^{-1} . The electronegativity of element according to Pauling scale is (1) 2.4 (2) 2.8 (3) 3.2 (4) 4.0
Answer» An element X has IE and EA respectively 275 and 1450 KJ mol^{-1} . The electronegativity of element according to Pauling scale is (1) 2.4 (2) 2.8 (3) 3.2 (4) 4.0

Discussion

9.	Write the structure of the major organic product in each of thefollowing reactions:(i) (ii) (iii) (iv) (v) (vi) (vii) (viii)
Answer» Write the structure of the major organic product in each of the following reactions: (i) (ii) (iii) (iv) (v) (vi) (vii) (viii)

9.

Write the structure of the major organic product in each of thefollowing reactions:(i) (ii) (iii) (iv) (v) (vi) (vii) (viii)

Answer»

Write the structure of the major organic product in each of the
following reactions:

(i)

(ii)

(iii)

(iv)

(v)

(vi)

(vii)

(viii)

Discussion

10.	31 In equilibrium 100litre vessel present the 1mol N2 2mol O2 and 3mol NO if added the new mol of O2 then concentrate of No is 0.04 mol/lit in equilibrium so what is the new added mol of O2 1)101/18 2)101/9 3)202/3 4) none
Answer» 31 In equilibrium 100litre vessel present the 1mol N2 2mol O2 and 3mol NO if added the new mol of O2 then concentrate of No is 0.04 mol/lit in equilibrium so what is the new added mol of O2 1)101/18 2)101/9 3)202/3 4) none

Discussion

11.	The density of 20%(w/w) aqueous NaOH solution is 1.20g/ml . What is the mole fraction of water? A)0.95 B)0.90 C)0.97 D)0.94
Answer» The density of 20%(w/w) aqueous NaOH solution is 1.20g/ml . What is the mole fraction of water? A)0.95 B)0.90 C)0.97 D)0.94

Discussion

12.	What is meant by induction?
Answer» What is meant by induction?

Discussion

13.	Molecule which do not follow octate rule A)SO3 B)NO C)NO2 D)N2O3 We have drawn structure of NO2 and N2O4 (lewis structure)
Answer» Molecule which do not follow octate rule A)SO3 B)NO C)NO2 D)N2O3 We have drawn structure of NO2 and N2O4 (lewis structure)

Discussion

14.	An ionic solid Na+A− crystallises in a rock salt type structure. 2.592 g of the ionic solid salt Na+A−is dissolved in water to make a 2 litre solution. The pH of this solution is 8. If distance between cation and anion is 300 pm. The density of the ionic solid (in gm/cm3) is. (Given : pKw= 13, pKa(HA) = 5, NA=6×1023
Answer» An ionic solid $N a^{+} A^{-}$ crystallises in a rock salt type structure. 2.592 g of the ionic solid salt $N a^{+} A^{-}$ is dissolved in water to make a 2 litre solution. The pH of this solution is 8. If distance between cation and anion is 300 pm. The density of the ionic solid (in gm/ $c m^{3}$ ) is. (Given : $p K_{w}$ = 13, $p K_{a}$ (HA) = 5, $N_{A} = 6 \times 10^{23}$

Discussion

15.	An aq. solution have a density of 1.25 g/ml.If molecular wt. of solute is 62.5 g/ mol,then calculate moarity of the solution.
Answer» An aq. solution have a density of 1.25 g/ml.If molecular wt. of solute is 62.5 g/ mol,then calculate moarity of the solution.

Discussion

16.	68. malonic acid on heating gives acetic acid. while succinic acid on heating will give
Answer» 68. malonic acid on heating gives acetic acid. while succinic acid on heating will give

Discussion

17.	A nucleus with Z=92, emits the following in a sequence, α,β−,β−,α,α,α,α,α,β−, β−,α,β+,β+,α. The Z of the resulting nucleus is ______.
Answer» A nucleus with $Z = 92$ , emits the following in a sequence, $α, β^{-}, β^{-}, α, α, α, α, α, β^{-},$ $β^{-}, α, β^{+}, β^{+}, α$ . The $Z$ of the resulting nucleus is ______.

Discussion

18.	Lgay lussac,s law of combining volumes
Answer» Lgay lussac,s law of combining volumes

Discussion

19.	29. The reaction vA gives products is second order with respect to A .It's half life is given by
Answer» 29. The reaction vA gives products is second order with respect to A .It's half life is given by

Discussion

20.	9 Xenon crystallizes as FCC lattice and it's edge length is 620 pm , calculate the distance between nearest neighbours and radii of xenon atom.
Answer» 9 Xenon crystallizes as FCC lattice and it's edge length is 620 pm , calculate the distance between nearest neighbours and radii of xenon atom.

Discussion

21.	49. No. Of electron in 180mg of glucose is
Answer» 49. No. Of electron in 180mg of glucose is

Discussion

22.	The pair of amphoteric hydroxides is
Answer» The pair of amphoteric hydroxides is

22.

The pair of amphoteric hydroxides is

Answer»

The pair of amphoteric hydroxides is

Discussion

23.	Inthree moles of ethane (C2H6),calculate the following:(i) Number of moles ofcarbon atoms.(ii) Number of moles ofhydrogen atoms.(iii) Number ofmolecules of ethane.
Answer» In three moles of ethane (C₂H₆), calculate the following: (i) Number of moles of carbon atoms. (ii) Number of moles of hydrogen atoms. (iii) Number of molecules of ethane.

23.

Inthree moles of ethane (C2H6),calculate the following:(i) Number of moles ofcarbon atoms.(ii) Number of moles ofhydrogen atoms.(iii) Number ofmolecules of ethane.

Answer»

In
three moles of ethane (C₂H₆),
calculate the following:

(i) Number of moles of
carbon atoms.

(ii) Number of moles of
hydrogen atoms.

(iii) Number of
molecules of ethane.

Discussion

24.	Which of the following is the most stable conformer of the given molecule?
Answer» Which of the following is the most stable conformer of the given molecule?

Discussion

25.	The pH of a solution at 25 degree Celsius containing 0.20 M sodium acetate and 0.06 M acetic acid is (pKa for CH3COOH = 4.74 and log 3 = 0.477) a) 4.36b) 5.26c) 5.84d) 6.32
Answer» The pH of a solution at 25 degree Celsius containing 0.20 M sodium acetate and 0.06 M acetic acid is (pKa for CH3COOH = 4.74 and log 3 = 0.477) a) 4.36 b) 5.26 c) 5.84 d) 6.32

Discussion

26.	9. Compute the number of ordered quadruples of positive integers (a, b, c, d) such that a! b! c! d! = 24!
Answer» 9. Compute the number of ordered quadruples of positive integers (a, b, c, d) such that a! b! c! d! = 24!

Discussion

27.	5g of crystalline salt rendered anhydrous; lost 1.8g of water. The formula weight of the anhydrous salts is 160. The number of water molecules of crystallization is
Answer» 5g of crystalline salt rendered anhydrous; lost 1.8g of water. The formula weight of the anhydrous salts is 160. The number of water molecules of crystallization is

27.

5g of crystalline salt rendered anhydrous; lost 1.8g of water. The formula weight of the anhydrous salts is 160. The number of water molecules of crystallization is

Answer»

5g of crystalline salt rendered anhydrous; lost 1.8g of water. The formula weight of the anhydrous salts is 160. The number of water molecules of

crystallization is

Discussion

28.	An unknown gas is kept in a cylinder at 27°C and 2 atm. With the help of piston, the pressure of the gas is decreased by 50% and temperature is increased to three times the initial temperature. If the initial volume of the gas was 800 ml, then the final volume of the gas will be
Answer» An unknown gas is kept in a cylinder at 27°C and 2 atm. With the help of piston, the pressure of the gas is decreased by 50% and temperature is increased to three times the initial temperature. If the initial volume of the gas was 800 ml, then the final volume of the gas will be

Discussion

29.	Triple point of water is –
Answer» Triple point of water is –

Discussion

30.	If a solid PQ having NACL type structure is heated that the ions along one body diagonal are lost and trivalent ions (R) are enter interstitial sites to maintain the electrical neutrality so that the new emperical formula unit is PxQyRz (x ,y ,z are small integerals) the value of x+y+z is [Q- form the lattice]
Answer» If a solid PQ having NACL type structure is heated that the ions along one body diagonal are lost and trivalent ions (R) are enter interstitial sites to maintain the electrical neutrality so that the new emperical formula unit is PxQyRz (x ,y ,z are small integerals) the value of x+y+z is [Q- form the lattice]

Discussion

31.	what is bio polymer?
Answer» what is bio polymer?

Discussion

32.	(i) Calculatethe total number of electrons present in one mole of methane.(ii) Find(a) the total number and (b) the total mass of neutrons in 7 mg of14C. (Assumethat mass of a neutron = 1.675 × 10–27kg).(iii) Find (a) the total number and (b) the totalmass of protons in 34 mg of NH3at STP. Willthe answer change if the temperature and pressure are changed?
Answer» (i) Calculate the total number of electrons present in one mole of methane. (ii) Find (a) the total number and (b) the total mass of neutrons in 7 mg of ¹⁴C. (Assume that mass of a neutron = 1.675 × 10^–27 kg). (iii) Find (a) the total number and (b) the total mass of protons in 34 mg of NH₃ at STP. Will the answer change if the temperature and pressure are changed?

32.

(i) Calculatethe total number of electrons present in one mole of methane.(ii) Find(a) the total number and (b) the total mass of neutrons in 7 mg of14C. (Assumethat mass of a neutron = 1.675 × 10–27kg).(iii) Find (a) the total number and (b) the totalmass of protons in 34 mg of NH3at STP. Willthe answer change if the temperature and pressure are changed?

Answer»

(i) Calculate
the total number of electrons present in one mole of methane.

(ii) Find
(a) the total number and (b) the total mass of neutrons in 7 mg of
¹⁴C.

(Assume
that mass of a neutron = 1.675 × 10^–27
kg).

(iii) Find (a) the total number and (b) the total
mass of protons in 34 mg of NH₃
at STP.

Will
the answer change if the temperature and pressure are changed?

Discussion

33.	The principle behind froth floatation method involves the difference in the ________of the ore and the gangue particles.
Answer» The principle behind froth floatation method involves the difference in the ________of the ore and the gangue particles.

Discussion

34.	When a hydrogen atom emits a photon of energy 12.1eV, its orbital angular momentum changes b
Answer» When a hydrogen atom emits a photon of energy 12.1eV, its orbital angular momentum changes b

Discussion

35.	Formic acid on heating with conc.H2SO4 gives .
Answer» Formic acid on heating with conc. $H_{2} S O_{4}$ gives .

Discussion

36.	99. 3.9g of a mixture of Al and Al2O3, when reacted with a sol. of NaOH, produced 840 ml of a gas at NTP. Then prove that the composition of Al in mix. is !7.3%.
Answer» 99. 3.9g of a mixture of Al and Al2O3, when reacted with a sol. of NaOH, produced 840 ml of a gas at NTP. Then prove that the composition of Al in mix. is !7.3%.

Discussion

37.	A plot of log (x/m) and log ‘p’ is a straight line at an angle of 45° and the intercept on the y-axis is equal to 0.3010. Calculate the amount of gas adsorbed in gram per gram of adsorbent when pressure is 0.2 atm.
Answer» A plot of log (x/m) and log ‘p’ is a straight line at an angle of 45° and the intercept on the y-axis is equal to 0.3010. Calculate the amount of gas adsorbed in gram per gram of adsorbent when pressure is 0.2 atm.

Discussion

38.	Octane number can be changed by
Answer» Octane number can be changed by

Discussion

39.	ntwhat is the effect of colour splitting in tetrahedral and octahedral ligands?n
Answer» ntwhat is the effect of colour splitting in tetrahedral and octahedral ligands?n

Discussion

40.	Which of the following amines doesn't respond to Hinsberg's reagent?
Answer» Which of the following amines doesn't respond to Hinsberg's reagent?

Discussion

41.	What mass in kg. Of K20 contains the same number of moles of K atoms as are present in 1 kg.of KCl
Answer» What mass in kg. Of K20 contains the same number of moles of K atoms as are present in 1 kg.of KCl

Discussion

42.	As 1.Temperature is directly proportional to pressure 2.Pressure is inversely proportional to Volume But in summers, let us say at 45oC if we fill air in tyres of bikes, as the temperature is high, pressure should be high and when pressure becomes high, volume should decrease! But this does not happen! Why?
Answer» As 1.Temperature is directly proportional to pressure 2.Pressure is inversely proportional to Volume But in summers, let us say at 45^oC if we fill air in tyres of bikes, as the temperature is high, pressure should be high and when pressure becomes high, volume should decrease! But this does not happen! Why?

Discussion

43.	44. The heat librated when 1.89g of benzoic acid is burnt in a bomd calorimeter at 25℃ and it increases the temperature of 18.94 kg of water by 0.632 ℃ . If rhe specific heat of water at 25 ℃ is 0.998cal/g-deg , the value of the heat of combustion of benzoic acid is.
Answer» 44. The heat librated when 1.89g of benzoic acid is burnt in a bomd calorimeter at 25℃ and it increases the temperature of 18.94 kg of water by 0.632 ℃ . If rhe specific heat of water at 25 ℃ is 0.998cal/g-deg , the value of the heat of combustion of benzoic acid is.

Discussion

44.	The reaction (ch3)2chbrch3 with zn-cu/EtOhProduct, yields
Answer» The reaction (ch3)2chbrch3 with zn-cu/EtOhProduct, yields

Discussion

45.	In which of the following reactions is the correct major product formed?
Answer» In which of the following reactions is the correct major product formed?

Discussion

46.	Which one of the following alkenes will react faster with H2 under catalytic hydrogenation condition?
Answer» Which one of the following alkenes will react faster with $H_{2}$ under catalytic hydrogenation condition?

Discussion

47.	Pair the similar shapes.
Answer» Pair the similar shapes.

Discussion

48.	What happens when sodium reacts with water?
Answer» What happens when sodium reacts with water?

Discussion

49.	Which of the following is iso-electronic?
Answer» Which of the following is iso-electronic?

Discussion

50.	68 In which molecule central atom have more than eight electrons in outermost shell? A)So3 B)So2 C)P2o5
Answer» 68 In which molecule central atom have more than eight electrons in outermost shell? A)So3 B)So2 C)P2o5

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Explain why benzylamine has a PKB of 4.67 and pyridine has a PKB of 8.75.pyridines lp are nt involved in resonance

36. Given that bond energies of H-H and Cl-Cl are 430kJ/mol and 240 kJ/mol respectively and Enthalpy change for formation of HCl is -90kJ/mol. Bond Enthalpy of HCl(in kJ/mol)is 245 2909 380 425

the equivalent weight of Mnso4 is equal to it's molecular weight when converted into

39. Which of the following is most acidic? H2o C2H4 C2H4 NH3

Which of the following is resistant to boiling aqua-regia

Why the compund with +1 oxidation state are more ionic than +3 oxidation state?!

An element X has IE and EA respectively 275 and 1450 KJ mol^{-1} . The electronegativity of element according to Pauling scale is (1) 2.4 (2) 2.8 (3) 3.2 (4) 4.0

Write the structure of the major organic product in each of thefollowing reactions:(i) (ii) (iii) (iv) (v) (vi) (vii) (viii)

31 In equilibrium 100litre vessel present the 1mol N2 2mol O2 and 3mol NO if added the new mol of O2 then concentrate of No is 0.04 mol/lit in equilibrium so what is the new added mol of O2 1)101/18 2)101/9 3)202/3 4) none

The density of 20%(w/w) aqueous NaOH solution is 1.20g/ml . What is the mole fraction of water? A)0.95 B)0.90 C)0.97 D)0.94

What is meant by induction?

Molecule which do not follow octate rule A)SO3 B)NO C)NO2 D)N2O3 We have drawn structure of NO2 and N2O4 (lewis structure)

An aq. solution have a density of 1.25 g/ml.If molecular wt. of solute is 62.5 g/ mol,then calculate moarity of the solution.

68. malonic acid on heating gives acetic acid. while succinic acid on heating will give

A nucleus with Z=92, emits the following in a sequence, α,β−,β−,α,α,α,α,α,β−, β−,α,β+,β+,α. The Z of the resulting nucleus is ______.

Lgay lussac,s law of combining volumes

29. The reaction vA gives products is second order with respect to A .It's half life is given by

9 Xenon crystallizes as FCC lattice and it's edge length is 620 pm , calculate the distance between nearest neighbours and radii of xenon atom.

49. No. Of electron in 180mg of glucose is

The pair of amphoteric hydroxides is

Inthree moles of ethane (C2H6),calculate the following:(i) Number of moles ofcarbon atoms.(ii) Number of moles ofhydrogen atoms.(iii) Number ofmolecules of ethane.

Which of the following is the most stable conformer of the given molecule?

The pH of a solution at 25 degree Celsius containing 0.20 M sodium acetate and 0.06 M acetic acid is (pKa for CH3COOH = 4.74 and log 3 = 0.477) a) 4.36b) 5.26c) 5.84d) 6.32

9. Compute the number of ordered quadruples of positive integers (a, b, c, d) such that a! b! c! d! = 24!

5g of crystalline salt rendered anhydrous; lost 1.8g of water. The formula weight of the anhydrous salts is 160. The number of water molecules of crystallization is

An unknown gas is kept in a cylinder at 27°C and 2 atm. With the help of piston, the pressure of the gas is decreased by 50% and temperature is increased to three times the initial temperature. If the initial volume of the gas was 800 ml, then the final volume of the gas will be

Triple point of water is –

what is bio polymer?

The principle behind froth floatation method involves the difference in the ________of the ore and the gangue particles.

When a hydrogen atom emits a photon of energy 12.1eV, its orbital angular momentum changes b

Formic acid on heating with conc.H2SO4 gives .

99. 3.9g of a mixture of Al and Al2O3, when reacted with a sol. of NaOH, produced 840 ml of a gas at NTP. Then prove that the composition of Al in mix. is !7.3%.

A plot of log (x/m) and log ‘p’ is a straight line at an angle of 45° and the intercept on the y-axis is equal to 0.3010. Calculate the amount of gas adsorbed in gram per gram of adsorbent when pressure is 0.2 atm.

Octane number can be changed by

ntwhat is the effect of colour splitting in tetrahedral and octahedral ligands?n

Which of the following amines doesn't respond to Hinsberg's reagent?

What mass in kg. Of K20 contains the same number of moles of K atoms as are present in 1 kg.of KCl

44. The heat librated when 1.89g of benzoic acid is burnt in a bomd calorimeter at 25℃ and it increases the temperature of 18.94 kg of water by 0.632 ℃ . If rhe specific heat of water at 25 ℃ is 0.998cal/g-deg , the value of the heat of combustion of benzoic acid is.

The reaction (ch3)2chbrch3 with zn-cu/EtOhProduct, yields

In which of the following reactions is the correct major product formed?

Which one of the following alkenes will react faster with H2 under catalytic hydrogenation condition?

Pair the similar shapes.

What happens when sodium reacts with water?

Which of the following is iso-electronic?

68 In which molecule central atom have more than eight electrons in outermost shell? A)So3 B)So2 C)P2o5