46295 + Interview Questions in Chemistry

1.	1.explain conjugation in pyrole and pyridine 2.what do we mean by complete conjugation and what are conditions required for it 3.in identifying whether a compound is aromatic or not,should all the atoms( carbon atoms and atoms other than carbon like nitrogen ) have sp2 hybridisation
Answer» 1.explain conjugation in pyrole and pyridine 2.what do we mean by complete conjugation and what are conditions required for it 3.in identifying whether a compound is aromatic or not,should all the atoms( carbon atoms and atoms other than carbon like nitrogen ) have sp2 hybridisation

Discussion

2.	Prove Gauss law and state the stateme by of Gauss law
Answer» Prove Gauss law and state the stateme by of Gauss law

Discussion

3.	If you are provided with a 2.5 M NaOH solution having a density of 1.6 g/mL, then find the molality of solution.(Atomic mass of Na=23 g)
Answer» If you are provided with a $2.5 M$ NaOH solution having a density of $1.6 g / m L$ , then find the molality of solution. (Atomic mass of $N a = 23 g$ )

Discussion

4.	A current of dry air was bubbled through a bulb containing 26.66 g of an organic compound in 200 g of water, then through a bulb at the same temperature, containing water and finally through a tube containing anhydrous calcium chloride. The loss of mass in bulb containing water was 0.1 g and gain in mass of the calcium chloride tube was 2.0 g.Calculate the molecular mass of the organic substance.
Answer» A current of dry air was bubbled through a bulb containing $26.66 g$ of an organic compound in $200 g$ of water, then through a bulb at the same temperature, containing water and finally through a tube containing anhydrous calcium chloride. The loss of mass in bulb containing water was $0.1 g$ and gain in mass of the calcium chloride tube was $2.0 g$ . Calculate the molecular mass of the organic substance.

Discussion

5.	8. Osazone formation ?
Answer» 8. Osazone formation ?

Discussion

6.	10.Integration of dx/3+4sinx
Answer» 10.Integration of dx/3+4sinx

Discussion

7.	\|(1+i) (2+i) /(3+i)\|
Answer» \|(1+i) (2+i) /(3+i)\|

Discussion

8.	Among the following,which hydride has less density than its parent metal?
Answer» Among the following,which hydride has less density than its parent metal?

Discussion

9.	What is elevation in boiling point and depression in freezing point?
Answer» What is elevation in boiling point and depression in freezing point?

Discussion

10.	Balance the equation Potassium bromide + Barium iodide = Potassium iodide + Barium chloride
Answer» Balance the equation Potassium bromide + Barium iodide = Potassium iodide + Barium chloride

Discussion

11.	H2S is acidic while H2O is neutral.Why?
Answer» H₂S is acidic while H₂O is neutral.Why?

Discussion

12.	The magnetic quantum number is related to:
Answer» The magnetic quantum number is related to:

Discussion

13.	Number of moles of electrons produced per mole of FeCr2O4 in the following redox reaction. FeCr2O4+KOH+O2→K2CrO4+Fe2O3
Answer» Number of moles of electrons produced per mole of $F e C r_{2} O_{4}$ in the following redox reaction. $F e C r_{2} O_{4} + K O H + O_{2} \to K_{2} C r O_{4} + F e_{2} O_{3}$

Discussion

14.	Two salts A2X and MX have the same value of solubility product of 4.0×10−12. The ratio of their molar solubilities i.e., S(A2X)S(MX)= . (Round off to the nearest Integer).
Answer» Two salts $A_{2} X$ and $M X$ have the same value of solubility product of $4.0 \times 10^{- 12}$ . The ratio of their molar solubilities i.e., $\frac{S (A_{2} X)}{S (M X)}$ = . (Round off to the nearest Integer).

Discussion

15.	25. how many number of nodes present in 6s,7p- orbitals
Answer» 25. how many number of nodes present in 6s,7p- orbitals

Discussion

16.	Vector laws
Answer» Vector laws

Discussion

17.	Propane is obtained from propene, by which of the following methods
Answer» Propane is obtained from propene, by which of the following methods

Discussion

18.	Me2SiCl2 on hydrolysis in presence of Cu at 570 K will produce:
Answer» $M e_{2} S i C l_{2}$ on hydrolysis in presence of Cu at 570 K will produce:

Discussion

19.	2-Phenyl-2-chloropropane on treatment with alc.KOH gives mainly:
Answer» 2-Phenyl-2-chloropropane on treatment with alc.KOH gives mainly:

Discussion

20.	In the figure AB is a wire of uniform cross - section and resistance 8r. A is an ideal ammeter with a resistance r in series as shown in figure below. The cells are of Emf's E & 2E and internal resistance r and 0 respectively. Jockey J can be moved freely on wire AB making contact on wire at C , length of wire is 1 m. Consider ammeter to be capable of measuring current in either direction of flow. (given that E=20 V ; r=2Ω .Find the reading of ammeter when it shows maximum value: (Give integer value)
Answer» In the figure $AB$ is a wire of uniform cross - section and resistance $8 r$ . $A$ is an ideal ammeter with a resistance $r$ in series as shown in figure below. The cells are of Emf's $E & 2 E$ and internal resistance $r$ and $0$ respectively. Jockey $J$ can be moved freely on wire $AB$ making contact on wire at $C$ , length of wire is $1 m$ . Consider ammeter to be capable of measuring current in either direction of flow. (given that $E = 20 V; r = 2 Ω$ .Find the reading of ammeter when it shows maximum value: (Give integer value)

Discussion

21.	32. Which of the following solution is hypertonic at constant identical temperature? 1M aqueous glucose 1M benzoic acid in benzene 1M aqueous ammonium phosphate 1M aqueous calcium chloride
Answer» 32. Which of the following solution is hypertonic at constant identical temperature? 1M aqueous glucose 1M benzoic acid in benzene 1M aqueous ammonium phosphate 1M aqueous calcium chloride

Discussion

22.	Weight of NaOH required to react completely with 0.1 equivalent of H2SO4??
Answer» Weight of NaOH required to react completely with 0.1 equivalent of H2SO4??

Discussion

23.	An element has atomic number 29. It belongs to the period x and group y. The value of (2x+y) will be:
Answer» An element has atomic number $29$ . It belongs to the period $x$ and group $y$ . The value of $(2 x + y)$ will be:

Discussion

24.	The standard enthalpies of formation of CO2(g),H2O(l) and glucose(s) at 25∘C are – 400 kJ/mol, - 300 kJ/mol and – 1300 kJ/mol, respectively. The standard enthalpy of combusion per gram of glucose at 25∘C is
Answer» The standard enthalpies of formation of $C O_{2} (g), H_{2} O (l)$ and glucose(s) at $25^{\circ} C$ are – 400 kJ/mol, - 300 kJ/mol and – 1300 kJ/mol, respectively. The standard enthalpy of combusion per gram of glucose at $25^{\circ} C$ is

Discussion

25.	how does ionic character affects solubility ??
Answer» how does ionic character affects solubility ??

Discussion

26.	Which one of the following is likely to give a precipitate with AgNO3 solution?
Answer» Which one of the following is likely to give a precipitate with $A g N O_{3}$ solution?

Discussion

27.	34. Iron carbonyl Fe (co)5 is 1.mononuclear 2.trinuclear
Answer» 34. Iron carbonyl Fe (co)5 is 1.mononuclear 2.trinuclear

Discussion

28.	The nuclei of two radioactive isotopes of same substance A236 and A234 are present in the ratio 4:1 in an ore obtained from Mars. Their halflives are 30 min and 60 min respectively. Both isotopes are alpha emitters and the activity of the isotope with half-life 30 min is one Rutherford. Calculate after how much time (in min) their activities will become identical.
Answer» The nuclei of two radioactive isotopes of same substance $A^{236} and A^{234}$ are present in the ratio $4 : 1$ in an ore obtained from Mars. Their halflives are $30 min a n d 60 min$ respectively. Both isotopes are alpha emitters and the activity of the isotope with half-life $30 min$ is one Rutherford. Calculate after how much time (in min) their activities will become identical.

Discussion

29.	In benzaldehyde, due to resonance, the benzene ring shows electron releasing tendency which decreases the polarity of carbonyl group,eventually decreasing the reactivity of it towards nucleophilic addition. However, in ketones the polarity of the carbonyl group is increased by electron releasing tendency of two alkyl groups. Why?
Answer» In benzaldehyde, due to resonance, the benzene ring shows electron releasing tendency which decreases the polarity of carbonyl group,eventually decreasing the reactivity of it towards nucleophilic addition. However, in ketones the polarity of the carbonyl group is increased by electron releasing tendency of two alkyl groups. Why?

Discussion

30.	For a zero order chemical reaction, 2NH3(g)→N2(g)+3H2(g) rate of reaction = 0.1 atm / sec. Initially only NH3 is present & its pressure = 3 atm. Calculate total pressure(in atm) at t = 10 sec.
Answer» For a zero order chemical reaction, $2 N H_{3} (g) \to N_{2} (g) + 3 H_{2} (g)$ rate of reaction = 0.1 atm / sec. Initially only $N H_{3}$ is present & its pressure = 3 atm. Calculate total pressure(in atm) at t = 10 sec.

Discussion

31.	9.How to judge overall order of reaction in a hypothetical reactions which follows certain mechanism?
Answer» 9.How to judge overall order of reaction in a hypothetical reactions which follows certain mechanism?

Discussion

32.	What is the approximate mass of one molecule of water?
Answer» What is the approximate mass of one molecule of water?

Discussion

33.	Major product of reaction is:
Answer» Major product of reaction is:

Discussion

34.	A single compound of the structureis obtainable from ozonolysis of which of the following cyclic compounds ?
Answer» A single compound of the structure is obtainable from ozonolysis of which of the following cyclic compounds ?

34.

A single compound of the structureis obtainable from ozonolysis of which of the following cyclic compounds ?

Answer»

A single compound of the structure

is obtainable from ozonolysis of which of the following cyclic compounds ?

Discussion

35.	The fraction of total volume occupied by the atoms present in simple cube is
Answer» The fraction of total volume occupied by the atoms present in simple cube is

Discussion

36.	Intermediate of above reaction is :
Answer» Intermediate of above reaction is :

Discussion

37.	which acid derivative have the highest boiling point acid chlorideamideacid anhydrideester
Answer» which acid derivative have the highest boiling point acid chloride amide acid anhydride ester

Discussion

38.	How to calculate the ratio of atoms in a molecule
Answer» How to calculate the ratio of atoms in a molecule

Discussion

39.	A charge q is uniformly distributed over a rod of length 2L consider a cube of edge length l with centre of the cube at one end of the earth the maximum possible electric flux through the surface of the cube is
Answer» A charge q is uniformly distributed over a rod of length 2L consider a cube of edge length l with centre of the cube at one end of the earth the maximum possible electric flux through the surface of the cube is

Discussion

40.	8. Which of the following alkene upon dichlorination can give only two products 1)CH3-CH2-CH3 2)CH4 3)C(CH3)4 4) CYCLOHEXANE
Answer» 8. Which of the following alkene upon dichlorination can give only two products 1)CH3-CH2-CH3 2)CH4 3)C(CH3)4 4) CYCLOHEXANE

Discussion

41.	50. How to determine the maximum freezing point of aqueous solutions ?
Answer» 50. How to determine the maximum freezing point of aqueous solutions ?

Discussion

42.	What is a virtual and real object
Answer» What is a virtual and real object

Discussion

43.	0.5 moles of gas A and x moles of gas B exert a pressure of 200Pa in a container of volume 10 m3 at 1000 K.Given R is the gas constant in JK−1 mol−1, x is:
Answer» 0.5 moles of gas A and x moles of gas B exert a pressure of $200 P a$ in a container of volume $10 m^{3}$ at $1000 K$ . Given R is the gas constant in $J K^{- 1} m o l^{- 1},$ x is:

Discussion

44.	Metal nitrates are usually not found as nitrates in their ores because they are highly soluble in water. (a) Metal nitrates are highly unstable (b) Metal nitrates are highly soluble in water
Answer» Metal nitrates are usually not found as nitrates in their ores because they are highly soluble in water. (a) Metal nitrates are highly unstable (b) Metal nitrates are highly soluble in water

44.

Metal nitrates are usually not found as nitrates in their ores because they are highly soluble in water. (a) Metal nitrates are highly unstable (b) Metal nitrates are highly soluble in water

Answer»

Metal nitrates are usually not found as nitrates in their ores because they are highly soluble in water.

(a) Metal nitrates are highly unstable

(b) Metal nitrates are highly soluble in water

Discussion

45.	The sodium test, or Lassaigne’s test, is used in an elemental analysis of the qualitative determination of the presence of foreign elements, namely halogens, nitrogen, sulphur and phosphorus in an organic compound. The test involves heating the sample strongly with a clean sodium metal, ‘fusing’ it with the sample. The ‘fused’ sample is then plunged into water, and the usual qualitative tests are performed on the resultant solution for the respective possible constituents. Which of the following compounds will give negative Lassaigne’s test for nitrogen?
Answer» The sodium test, or Lassaigne’s test, is used in an elemental analysis of the qualitative determination of the presence of foreign elements, namely halogens, nitrogen, sulphur and phosphorus in an organic compound. The test involves heating the sample strongly with a clean sodium metal, ‘fusing’ it with the sample. The ‘fused’ sample is then plunged into water, and the usual qualitative tests are performed on the resultant solution for the respective possible constituents. Which of the following compounds will give negative Lassaigne’s test for nitrogen?

Discussion

46.	Which of the following species is not stable?
Answer» Which of the following species is not stable?

Discussion

47.	KspMg(OH)2 is 4.0×10−12. The number of moles of Mg2+ ions in one litre of its saturated solution in 0.1 M NaOH is :
Answer» $K_{s p} M g (O H)_{2}$ is $4.0 \times 10^{- 12}$ . The number of moles of $M g^{2 +}$ ions in one litre of its saturated solution in 0.1 M NaOH is :

Discussion

48.	nt2 moles of an ideal monatomic gas is expanded such that initial pressure is halved. The initial state is (Po, Vo) and the thermodynamic process follows the equation PT=constant. The change in internal energy of the gas isn ntA. 3PoVon ntB. 3PoVo/2n ntC. 5PoVon ntD. 5PoVo/2n
Answer» nt2 moles of an ideal monatomic gas is expanded such that initial pressure is halved. The initial state is (Po, Vo) and the thermodynamic process follows the equation PT=constant. The change in internal energy of the gas isn ntA. 3PoVon ntB. 3PoVo/2n ntC. 5PoVon ntD. 5PoVo/2n

Discussion

49.	If a 0.75 g sample contains 3.011×1022 molecules, what will be the molar mass of the molecule?
Answer» If a $0.75 g$ sample contains $3.011 \times 10^{22}$ molecules, what will be the molar mass of the molecule?

Discussion

50.	Why is iodine a mordant in gram staining technique?
Answer» Why is iodine a mordant in gram staining technique?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

1.explain conjugation in pyrole and pyridine 2.what do we mean by complete conjugation and what are conditions required for it 3.in identifying whether a compound is aromatic or not,should all the atoms( carbon atoms and atoms other than carbon like nitrogen ) have sp2 hybridisation

Prove Gauss law and state the stateme by of Gauss law

If you are provided with a 2.5 M NaOH solution having a density of 1.6 g/mL, then find the molality of solution.(Atomic mass of Na=23 g)

8. Osazone formation ?

10.Integration of dx/3+4sinx

|(1+i) (2+i) /(3+i)|

Among the following,which hydride has less density than its parent metal?

What is elevation in boiling point and depression in freezing point?

Balance the equation Potassium bromide + Barium iodide = Potassium iodide + Barium chloride

H​​​​​​2S is acidic while H​​​​​​2​​​O is neutral.Why?

The magnetic quantum number is related to:

Number of moles of electrons produced per mole of FeCr2O4 in the following redox reaction. FeCr2O4+KOH+O2→K2CrO4+Fe2O3

Two salts A2X and MX have the same value of solubility product of 4.0×10−12. The ratio of their molar solubilities i.e., S(A2X)S(MX)= . (Round off to the nearest Integer).

25. how many number of nodes present in 6s,7p- orbitals

Vector laws

Propane is obtained from propene, by which of the following methods

Me2SiCl2 on hydrolysis in presence of Cu at 570 K will produce:

2-Phenyl-2-chloropropane on treatment with alc.KOH gives mainly:

32. Which of the following solution is hypertonic at constant identical temperature? 1M aqueous glucose 1M benzoic acid in benzene 1M aqueous ammonium phosphate 1M aqueous calcium chloride

Weight of NaOH required to react completely with 0.1 equivalent of H2SO4??

An element has atomic number 29. It belongs to the period x and group y. The value of (2x+y) will be:

The standard enthalpies of formation of CO2(g),H2O(l) and glucose(s) at 25∘C are – 400 kJ/mol, - 300 kJ/mol and – 1300 kJ/mol, respectively. The standard enthalpy of combusion per gram of glucose at 25∘C is

how does ionic character affects solubility ??

Which one of the following is likely to give a precipitate with AgNO3 solution?

34. Iron carbonyl Fe (co)5 is 1.mononuclear 2.trinuclear

For a zero order chemical reaction, 2NH3(g)→N2(g)+3H2(g) rate of reaction = 0.1 atm / sec. Initially only NH3 is present & its pressure = 3 atm. Calculate total pressure(in atm) at t = 10 sec.

9.How to judge overall order of reaction in a hypothetical reactions which follows certain mechanism?

What is the approximate mass of one molecule of water?

Major product of reaction is:

A single compound of the structureis obtainable from ozonolysis of which of the following cyclic compounds ?

The fraction of total volume occupied by the atoms present in simple cube is

Intermediate of above reaction is :

which acid derivative have the highest boiling point acid chlorideamideacid anhydrideester

How to calculate the ratio of atoms in a molecule

A charge q is uniformly distributed over a rod of length 2L consider a cube of edge length l with centre of the cube at one end of the earth the maximum possible electric flux through the surface of the cube is

8. Which of the following alkene upon dichlorination can give only two products 1)CH3-CH2-CH3 2)CH4 3)C(CH3)4 4) CYCLOHEXANE

50. How to determine the maximum freezing point of aqueous solutions ?

What is a virtual and real object

0.5 moles of gas A and x moles of gas B exert a pressure of 200Pa in a container of volume 10 m3 at 1000 K.Given R is the gas constant in JK−1 mol−1, x is:

Metal nitrates are usually not found as nitrates in their ores because they are highly soluble in water. (a) Metal nitrates are highly unstable (b) Metal nitrates are highly soluble in water

Which of the following species is not stable?

KspMg(OH)2 is 4.0×10−12. The number of moles of Mg2+ ions in one litre of its saturated solution in 0.1 M NaOH is :

nt2 moles of an ideal monatomic gas is expanded such that initial pressure is halved. The initial state is (Po, Vo) and the thermodynamic process follows the equation PT=constant. The change in internal energy of the gas isn ntA. 3PoVon ntB. 3PoVo/2n ntC. 5PoVon ntD. 5PoVo/2n

If a 0.75 g sample contains 3.011×1022 molecules, what will be the molar mass of the molecule?

Why is iodine a mordant in gram staining technique?

H2S is acidic while H2O is neutral.Why?