46295 + Interview Questions in Chemistry

1.	How much solute is present in the 8.2 L of solution to give an osmotic pressure of 0.3 atm at 27 oC? Molar mass of solute is 100 g/mol.
Answer» How much solute is present in the 8.2 L of solution to give an osmotic pressure of 0.3 atm at 27 ^oC? Molar mass of solute is 100 g/mol.

Discussion

2.	Arrange the following in their decreasing order of basic character.
Answer» Arrange the following in their decreasing order of basic character.

Discussion

3.	1.6 gram metal reacts with oxygen and produce 2.0 gram metal oxide find equivalent weight of metal
Answer» 1.6 gram metal reacts with oxygen and produce 2.0 gram metal oxide find equivalent weight of metal

Discussion

4.	What is the number of phases in image A and number of phases in the solution in image B?
Answer» What is the number of phases in image A and number of phases in the solution in image B?

Discussion

5.	Two aqueous solutions are put in an evacuated chamber. When equilibrium is obtained, it is found that one solution contains 0.01% of CH3COOH and other 0.014% of urea by weight, if degree of dissociation is ′α′ then what is the value of α?
Answer» Two aqueous solutions are put in an evacuated chamber. When equilibrium is obtained, it is found that one solution contains 0.01% of $C H_{3} C O O H$ and other $0.014$ % of urea by weight, if degree of dissociation is $^{'} α^{'}$ then what is the value of $α$ ?

Discussion

6.	The anode used in Hall-Heroults process of electrolysis is of
Answer» The anode used in Hall-Heroults process of electrolysis is of

Discussion

7.	What is the characteristic property common to both cis-2-butene , trans-2- butene? a) boiling point. b) dipole moment c)heat of hydrogenation. d) product of hydrogenation What do options c and d mean?
Answer» What is the characteristic property common to both cis-2-butene , trans-2- butene? a) boiling point. b) dipole moment c)heat of hydrogenation. d) product of hydrogenation What do options c and d mean?

Discussion

8.	Butanal is an example of [MP PET 1991]
Answer» Butanal is an example of [MP PET 1991]

Discussion

9.	What will be the products of this reaction?
Answer» What will be the products of this reaction?

Discussion

10.	Which of the following ammonium salt will produce dinitrogen on heating?
Answer» Which of the following ammonium salt will produce dinitrogen on heating?

Discussion

11.	A gas contained in a cylinder fitted with a frictionless piston expands against a constant pressure 1 atmosphere from a volume of 4 liter to a volume of 14 liter. In doing so, it absorbs 800J thermal energy from surroundings. The value of ΔU for the process is.
Answer» A gas contained in a cylinder fitted with a frictionless piston expands against a constant pressure 1 atmosphere from a volume of 4 liter to a volume of 14 liter. In doing so, it absorbs 800J thermal energy from surroundings. The value of $Δ U$ for the process is.

Discussion

12.	If the electron in a hydrogen atom makes 6.25×10^15 revolutions in a second, the current is
Answer» If the electron in a hydrogen atom makes 6.25×10^15 revolutions in a second, the current is

Discussion

13.	Ligand in a metal carbonyl complex is :
Answer» Ligand in a metal carbonyl complex is :

Discussion

14.	Peroxide effect of addition of HBr to an alkene occurs through a stable:
Answer» Peroxide effect of addition of HBr to an alkene occurs through a stable:

Discussion

15.	16. In a chemical reaction, caco3+2hcl= cacl2 +co2+h2o. 25ml hcl and 0.75M Calculate the amount of caco3
Answer» 16. In a chemical reaction, caco3+2hcl= cacl2 +co2+h2o. 25ml hcl and 0.75M Calculate the amount of caco3

Discussion

16.	7. A mixture of MgCO_3 and CaCO_3 is heated for a long time then its weight decreases by 50% . Find out the % composition of the mixture.
Answer» 7. A mixture of MgCO_3 and CaCO_3 is heated for a long time then its weight decreases by 50% . Find out the % composition of the mixture.

Discussion

17.	The reaction of Q with PhSNa yields an organic compound (major product) that gives positive Carius test on treatment with Na2O2 followed by addition of BaCl2. The correct option(s) for Q is/are:
Answer» The reaction of $Q$ with $P h S N a$ yields an organic compound (major product) that gives positive Carius test on treatment with $N a_{2} O_{2}$ followed by addition of $B a C l_{2}$ . The correct option(s) for $Q$ is/are:

Discussion

18.	Atoxic element is to be removed from drinking waterby adsorption on activated charcoal. At lowconcentrations, the rate constant for adsorption is1.8 x 10-5 5-1. The time required to reduce theconcentration of the toxic element to 10% of its initialconcentration is[NSEC 2017](1) 1.28 ~ 105 S(2) 5.85 x 103 s(3) 1.28 x 106 s
Answer» Atoxic element is to be removed from drinking water by adsorption on activated charcoal. At low concentrations, the rate constant for adsorption is 1.8 x 10-5 5-1. The time required to reduce the concentration of the toxic element to 10% of its initial concentration is [NSEC 2017] (1) 1.28 ~ 105 S (2) 5.85 x 103 s (3) 1.28 x 106 s

Discussion

19.	R1−C≡N+R2MgBr(i)Dry ether−−−−−−−→(ii)H3O+1−phenyl−1−propanoneR1 and R2 groups are respectively:
Answer» $R_{1} - C \equiv N + R_{2} M g B r (i) D r y e t h e r - ------ \to (i i) H_{3} O^{+} 1 - p h e n y l - 1 - p r o p a n o n e$ $R_{1}$ and $R_{2}$ groups are respectively:

Discussion

20.	Why does not carbon make more than triple bonds
Answer» Why does not carbon make more than triple bonds

Discussion

21.	How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0 M HNO3. The concentrated nitric acid is 70% HNO3.
Answer» How many grams of concentrated nitric acid solution should be used to prepare $250 mL$ of $2.0 M H N O_{3}$ . The concentrated nitric acid is $70 % H N O_{3}$ .

Discussion

22.	Why helium is placed in p block not in s block ?He =1s² as its configuration.
Answer» Why helium is placed in p block not in s block ?He =1s² as its configuration.

Discussion

23.	'P' may be :
Answer» 'P' may be :

Discussion

24.	Question 01 Which of the following conclusions could not be derived from Rutherford's α-particles scattering experiment ? (a) Most of the space in the atom is empty (b) The radius of the atom is about 10−10m while that of nucleus is 10−15m (c) Electrons move in a circular path of fixed energy called orbits (d) Electrons and the nucleus are held together by electrostatic forces of attraction
Answer» Question 01 Which of the following conclusions could not be derived from Rutherford's $α$ -particles scattering experiment ? (a) Most of the space in the atom is empty (b) The radius of the atom is about $10^{- 10} m$ while that of nucleus is $10^{- 15} m$ (c) Electrons move in a circular path of fixed energy called orbits (d) Electrons and the nucleus are held together by electrostatic forces of attraction

24.

Question 01 Which of the following conclusions could not be derived from Rutherford's α-particles scattering experiment ? (a) Most of the space in the atom is empty (b) The radius of the atom is about 10−10m while that of nucleus is 10−15m (c) Electrons move in a circular path of fixed energy called orbits (d) Electrons and the nucleus are held together by electrostatic forces of attraction

Answer»

Question 01

Which of the following conclusions could not be derived from Rutherford's $α$ -particles scattering experiment ?

(a) Most of the space in the atom is empty

(b) The radius of the atom is about $10^{- 10} m$ while that of nucleus is $10^{- 15} m$

(c) Electrons move in a circular path of fixed energy called orbits

(d) Electrons and the nucleus are held together by electrostatic forces of attraction

Discussion

25.	Among the following, one which reacts most readily with ethanol is:
Answer» Among the following, one which reacts most readily with ethanol is:

Discussion

26.	Thedecomposition of hydrocarbon follows the equationk= (4.5 ×1011 s−1)e−28000K/TCalculateEa.
Answer» The decomposition of hydrocarbon follows the equation k = (4.5 × 10¹¹s⁻¹) e⁻²⁸⁰⁰⁰^K^/^T Calculate E_a.

26.

Thedecomposition of hydrocarbon follows the equationk= (4.5 ×1011 s−1)e−28000K/TCalculateEa.

Answer»

The
decomposition of hydrocarbon follows the equation

k
= (4.5 ×
10¹¹s⁻¹)
e⁻²⁸⁰⁰⁰^K^/^T

Calculate
E_a.

Discussion

27.	1.What is the product formed by the ozonolysis of benzene ? And what will happen if the product is treated with water??2.why is the ozonolysis products of alkenes and alkynes different??
Answer» 1.What is the product formed by the ozonolysis of benzene ? And what will happen if the product is treated with water?? 2.why is the ozonolysis products of alkenes and alkynes different??

Discussion

28.	According to Avogadro's hypothesis, two samples of gas of equal volume, at the same temperature and pressure, contain the same number of molecules. But is there any proof of this? We can't possibly count the total molecules in two different gases of equal volumes at equal temperature and pressure. Then how did we arrive at this hypothesis? If not experemental, is there any Mathematical proof of this statement? Even the exact number of atoms or molecules in 1 mole of any substance is known and is termed as Avogadro's Number. How was is found? How did we know the exact number of molecules present in 1 mole of a substance? Please provide the derivation if any.
Answer» According to Avogadro's hypothesis, two samples of gas of equal volume, at the same temperature and pressure, contain the same number of molecules. But is there any proof of this? We can't possibly count the total molecules in two different gases of equal volumes at equal temperature and pressure. Then how did we arrive at this hypothesis? If not experemental, is there any Mathematical proof of this statement? Even the exact number of atoms or molecules in 1 mole of any substance is known and is termed as Avogadro's Number. How was is found? How did we know the exact number of molecules present in 1 mole of a substance? Please provide the derivation if any.

Discussion

29.	(vi) Acetylation(vi) Gabriel phthalimide synthesis.Accomplish the following conversions,NOGoo M-ti Nitrobenzene to benzoic acidlifi) Benzene to m-bromophenoliii) Benzoic acid to anilinNaNb+ 2.
Answer» (vi) Acetylation(vi) Gabriel phthalimide synthesis.Accomplish the following conversions,NOGoo M-ti Nitrobenzene to benzoic acidlifi) Benzene to m-bromophenoliii) Benzoic acid to anilinNaNb+ 2.

Discussion

30.	60 ml mixture of nitrous and nitric acid was exploded with excess of H2 if 38ml N2 was formed then percentage of N2O in the mixture was ?
Answer» 60 ml mixture of nitrous and nitric acid was exploded with excess of H2 if 38ml N2 was formed then percentage of N2O in the mixture was ?

Discussion

31.	15. when benzene reacts with HCN in presence of AlCl3 what happens
Answer» 15. when benzene reacts with HCN in presence of AlCl3 what happens

Discussion

32.	Draw lewis struture of H2O2(hydrogen peroxide)
Answer» Draw lewis struture of H2O2(hydrogen peroxide)

Discussion

33.	13. Why exhausted zeolite is revived with sodium chloride if soluble impurities are formed again?
Answer» 13. Why exhausted zeolite is revived with sodium chloride if soluble impurities are formed again?

Discussion

34.	The chemical elements(P, Si ,Se ,Br ,N) are arranged in the order ofincreasing electronegativities in the sequenceand how
Answer» The chemical elements(P, Si ,Se ,Br ,N) are arranged in the order ofincreasing electronegativities in the sequenceand how

Discussion

35.	Mixture of chloroxylenol and terpineol acts as
Answer» Mixture of chloroxylenol and terpineol acts as

Discussion

36.	No heat is supplied to a liquid during evaporation. How does then the liquid change into its vapour?
Answer» No heat is supplied to a liquid during evaporation. How does then the liquid change into its vapour?

Discussion

37.	Among the chalcogens, the element that exhibits the highest tendency for catenation is:
Answer» Among the chalcogens, the element that exhibits the highest tendency for catenation is:

Discussion

38.	The SN2 reactivity order for halides is:
Answer» The $S_{N} 2$ reactivity order for halides is:

Discussion

39.	86. The increasing order for the values of e/m for electron , proton , neutron and alpha particle?
Answer» 86. The increasing order for the values of e/m for electron , proton , neutron and alpha particle?

Discussion

40.	Calculate the temperature of 2 moles of a gas occupying a volume of 5 liters at 2.46 atmospheres.
Answer» Calculate the temperature of 2 moles of a gas occupying a volume of 5 liters at 2.46 atmospheres.

Discussion

41.	Question 12 (d) Give reason why carbonate and sulphide ores are usually converted into oxides during the process of extraction.
Answer» Question 12 (d) Give reason why carbonate and sulphide ores are usually converted into oxides during the process of extraction.

Discussion

42.	How many monochloro products are possible theoretically when n-hexane is treated with Cl2 in sunlight?
Answer» How many monochloro products are possible theoretically when n-hexane is treated with $C l_{2}$ in sunlight?

Discussion

43.	Reversible work of expansion is maximum work. Explain
Answer» Reversible work of expansion is maximum work. Explain

Discussion

44.	6. Synthesis m-dibromobenzene from benzene ?? What is the method to do conversions?
Answer» 6. Synthesis m-dibromobenzene from benzene ?? What is the method to do conversions?

Discussion

45.	28. Find the work done in increasing temperature of nitrogen at constant pressure from 37^° C to 337^° C.Cp=7 cal/ mol^° c,in this pressure what is the work done by the gas?
Answer» 28. Find the work done in increasing temperature of nitrogen at constant pressure from 37^° C to 337^° C.Cp=7 cal/ mol^° c,in this pressure what is the work done by the gas?

Discussion

46.	Bravis structure
Answer» Bravis structure

Discussion

47.	What is the step-by-step pathway by which a reaction occur known as?
Answer» What is the step-by-step pathway by which a reaction occur known as?

Discussion

48.	what is oxidation state ? and what is the oxidation state of 1& 2 group?
Answer» what is oxidation state ? and what is the oxidation state of 1& 2 group?

Discussion

49.	The vapour pressure of water at 80oC is 355 torr. A 100ml vessel contained water-saturated oxygen at 80oC , the total gas pressure being 760 torr. The contents of the vessel were pumped into a 50ml vessel at the same temperature. What were the partial pressures of oxygen and water vapor? What was the total pressure in the final equilibrium state? Neglect the volume of any water which might condense.
Answer» The vapour pressure of water at 80^oC is 355 torr. A 100ml vessel contained water-saturated oxygen at 80^oC , the total gas pressure being 760 torr. The contents of the vessel were pumped into a 50ml vessel at the same temperature. What were the partial pressures of oxygen and water vapor? What was the total pressure in the final equilibrium state? Neglect the volume of any water which might condense.

Discussion

50.	60. Consider the half-cell reduction reaction Mn2+ 2e- Mn, Eo1.18 V Mn2+ Mn3+ + e-, Eo =-1.51 V The Eo for the reaction 3 Mn2 Mn 2 Mn3+, and possibility of the forward reaction are, respectively (1)-2.69 V and no (3) +0.33 V and yes (4) +2.69 V and no (2) -4.18 V and yes
Answer» 60. Consider the half-cell reduction reaction Mn2+ 2e- Mn, Eo1.18 V Mn2+ Mn3+ + e-, Eo =-1.51 V The Eo for the reaction 3 Mn2 Mn 2 Mn3+, and possibility of the forward reaction are, respectively (1)-2.69 V and no (3) +0.33 V and yes (4) +2.69 V and no (2) -4.18 V and yes

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

How much solute is present in the 8.2 L of solution to give an osmotic pressure of 0.3 atm at 27 oC? Molar mass of solute is 100 g/mol.

Arrange the following in their decreasing order of basic character.

1.6 gram metal reacts with oxygen and produce 2.0 gram metal oxide find equivalent weight of metal

What is the number of phases in image A and number of phases in the solution in image B?

Two aqueous solutions are put in an evacuated chamber. When equilibrium is obtained, it is found that one solution contains 0.01% of CH3COOH and other 0.014% of urea by weight, if degree of dissociation is ′α′ then what is the value of α?

The anode used in Hall-Heroults process of electrolysis is of

What is the characteristic property common to both cis-2-butene , trans-2- butene? a) boiling point. b) dipole moment c)heat of hydrogenation. d) product of hydrogenation What do options c and d mean?

Butanal is an example of [MP PET 1991]

What will be the products of this reaction?

Which of the following ammonium salt will produce dinitrogen on heating?

A gas contained in a cylinder fitted with a frictionless piston expands against a constant pressure 1 atmosphere from a volume of 4 liter to a volume of 14 liter. In doing so, it absorbs 800J thermal energy from surroundings. The value of ΔU for the process is.

If the electron in a hydrogen atom makes 6.25×10^15 revolutions in a second, the current is

Ligand in a metal carbonyl complex is :

Peroxide effect of addition of HBr to an alkene occurs through a stable:

16. In a chemical reaction, caco3+2hcl= cacl2 +co2+h2o. 25ml hcl and 0.75M Calculate the amount of caco3

7. A mixture of MgCO_3 and CaCO_3 is heated for a long time then its weight decreases by 50% . Find out the % composition of the mixture.

The reaction of Q with PhSNa yields an organic compound (major product) that gives positive Carius test on treatment with Na2O2 followed by addition of BaCl2. The correct option(s) for Q is/are:

R1−C≡N+R2MgBr(i)Dry ether−−−−−−−→(ii)H3O+1−phenyl−1−propanoneR1 and R2 groups are respectively:

Why does not carbon make more than triple bonds

How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0 M HNO3. The concentrated nitric acid is 70% HNO3.

Why helium is placed in p block not in s block ?He =1s² as its configuration.

'P' may be :

Among the following, one which reacts most readily with ethanol is:

Thedecomposition of hydrocarbon follows the equationk= (4.5 ×1011 s−1)e−28000K/TCalculateEa.

1.What is the product formed by the ozonolysis of benzene ? And what will happen if the product is treated with water??2.why is the ozonolysis products of alkenes and alkynes different??

(vi) Acetylation(vi) Gabriel phthalimide synthesis.Accomplish the following conversions,NOGoo M-ti Nitrobenzene to benzoic acidlifi) Benzene to m-bromophenoliii) Benzoic acid to anilinNaNb+ 2.

60 ml mixture of nitrous and nitric acid was exploded with excess of H2 if 38ml N2 was formed then percentage of N2O in the mixture was ?

15. when benzene reacts with HCN in presence of AlCl3 what happens

Draw lewis struture of H2O2(hydrogen peroxide)

13. Why exhausted zeolite is revived with sodium chloride if soluble impurities are formed again?

The chemical elements(P, Si ,Se ,Br ,N) are arranged in the order ofincreasing electronegativities in the sequenceand how

Mixture of chloroxylenol and terpineol acts as

No heat is supplied to a liquid during evaporation. How does then the liquid change into its vapour?

Among the chalcogens, the element that exhibits the highest tendency for catenation is:

The SN2 reactivity order for halides is:

86. The increasing order for the values of e/m for electron , proton , neutron and alpha particle?

Calculate the temperature of 2 moles of a gas occupying a volume of 5 liters at 2.46 atmospheres.

Question 12 (d) Give reason why carbonate and sulphide ores are usually converted into oxides during the process of extraction.

How many monochloro products are possible theoretically when n-hexane is treated with Cl2 in sunlight?

Reversible work of expansion is maximum work. Explain

6. Synthesis m-dibromobenzene from benzene ?? What is the method to do conversions?

28. Find the work done in increasing temperature of nitrogen at constant pressure from 37^° C to 337^° C.Cp=7 cal/ mol^° c,in this pressure what is the work done by the gas?

Bravis structure

What is the step-by-step pathway by which a reaction occur known as?

what is oxidation state ? and what is the oxidation state of 1& 2 group?

60. Consider the half-cell reduction reaction Mn2+ 2e- Mn, Eo1.18 V Mn2+ Mn3+ + e-, Eo =-1.51 V The Eo for the reaction 3 Mn2 Mn 2 Mn3+, and possibility of the forward reaction are, respectively (1)-2.69 V and no (3) +0.33 V and yes (4) +2.69 V and no (2) -4.18 V and yes