46295 + Interview Questions in Chemistry

1.	A 24.6 MeV alpha particle moves towards gold nucleus (atomic number 79). Calculate the distance of closest approach of alpha particle.
Answer» A 24.6 MeV alpha particle moves towards gold nucleus (atomic number 79). Calculate the distance of closest approach of alpha particle.

Discussion

2.	If the density of a certain gas at 30∘C and 768 torr is 1.35 kg/m3 , its density at STP would be:
Answer» If the density of a certain gas at $30^{\circ} C$ and $768$ torr is $1.35 {kg/m}^{3}$ , its density at STP would be:

Discussion

3.	Van't Hoff factor for Ca(NO3)2 on 100% dissociation.
Answer» Van't Hoff factor for Ca(NO₃)₂ on 100% dissociation.

Discussion

4.	Which one of the following is 1-bromo-3-methyl butane?
Answer» Which one of the following is 1-bromo-3-methyl butane?

Discussion

5.	What are interstitial compounds? Why are such compounds well known for transition metals?
Answer» What are interstitial compounds? Why are such compounds well known for transition metals?

5.

What are interstitial compounds? Why are such compounds well known for transition metals?

Answer»

What are
interstitial compounds? Why are such compounds well known for

transition
metals?

Discussion

6.	which is not a disproportionation reaction?(a)P4+OH^- --->PH3+H2PO2^-(b)Cl2+OH^- --->Cl^-+OCl(c)BR2+OH^- --->Br^- +BrO3^-(d)2KClO3 --->2KCl+3O2
Answer» which is not a disproportionation reaction? (a)P4+OH^- --->PH3+H2PO2^- (b)Cl2+OH^- --->Cl^-+OCl (c)BR2+OH^- --->Br^- +BrO3^- (d)2KClO3 --->2KCl+3O2

Discussion

7.	Average lifetime of a hydrogen atom excited to n = 2 state is 10−8 s. Find the number of revolutions made by the electron on the avera ge before it jumps to the ground state.
Answer» Average lifetime of a hydrogen atom excited to n = 2 state is $10^{- 8}$ s. Find the number of revolutions made by the electron on the avera ge before it jumps to the ground state.

Discussion

8.	34.What is the composition of seridite ore
Answer» 34.What is the composition of seridite ore

Discussion

9.	What is the structural formula of 3-ethyl-4-(1-methylpropyl)-2,2-dimethyloctane ?
Answer» What is the structural formula of 3-ethyl-4-(1-methylpropyl)-2,2-dimethyloctane ?

Discussion

10.	The decreasing base strength of OH−, NH−2, HC≡C− and CH3CH−2 is:
Answer» The decreasing base strength of $O H^{-}, N H_{2}^{-}, H C \equiv C^{-} and C H_{3} C H_{2}^{-}$ is:

Discussion

11.	NH3 IS PYRAMIDAL BUT NH4+ IS TETRAHEDRAL
Answer» NH3 IS PYRAMIDAL BUT NH4+ IS TETRAHEDRAL

Discussion

12.	The photoelectrons emitted from a given cathode on the incidence of a given monochromatic beam of light have
Answer» The photoelectrons emitted from a given cathode on the incidence of a given monochromatic beam of light have

Discussion

13.	A boat carrying a number of stones is floating in awater tank. If the stones are unloaded into water, thewater level in the tank will 1)Pemain unchanged 2) Rise (3) Fall 4) Rise or fall depends on the number of stonesunloaded
Answer» A boat carrying a number of stones is floating in awater tank. If the stones are unloaded into water, thewater level in the tank will 1)Pemain unchanged 2) Rise (3) Fall 4) Rise or fall depends on the number of stonesunloaded

Discussion

14.	The correct sequence regarding the basic strength of the amines in aqueous solution is(R is CH3):
Answer» The correct sequence regarding the basic strength of the amines in aqueous solution is( $R is C H_{3}$ ):

Discussion

15.	isotonic solution have the same : a)density b)molar concentration c)normality d) none of thes
Answer» isotonic solution have the same : a)density b)molar concentration c)normality d) none of thes

Discussion

16.	What volume of 0.25M Hcl is required to react completely with 22.6g of Na2co3 according to the equation Na2Co3+2Hcl=2Nacl=H20 (2) The molecular mass of organic compound is 78% and and its %composition is 92.4%C and 7.6%H.Find the molecular formula of the compound.
Answer» What volume of 0.25M Hcl is required to react completely with 22.6g of Na2co3 according to the equation Na2Co3+2Hcl=2Nacl=H20 (2) The molecular mass of organic compound is 78% and and its %composition is 92.4%C and 7.6%H.Find the molecular formula of the compound.

Discussion

17.	7.How many electrons in sulphur(Z=16) can have n+l=3?
Answer» 7.How many electrons in sulphur(Z=16) can have n+l=3?

Discussion

18.	Alkaline earth metals dissolve in liquid ammonia to form bright blue coloured solutions in dilution because of
Answer» Alkaline earth metals dissolve in liquid ammonia to form bright blue coloured solutions in dilution because of

Discussion

19.	The unit of length convenient on an atomic scale is known as angstrom and is denoted by A=10^-10m the size of hydrogen atoms is about 0.5 angstrom what is the total atomic volume in m^3 of a mole of hydrogen atom
Answer» The unit of length convenient on an atomic scale is known as angstrom and is denoted by A=10^-10m the size of hydrogen atoms is about 0.5 angstrom what is the total atomic volume in m^3 of a mole of hydrogen atom

Discussion

20.	the breadth of a rectangular sheet is measured as 10.1 cm.the error in measurement is?
Answer» the breadth of a rectangular sheet is measured as 10.1 cm.the error in measurement is?

Discussion

21.	NX is produced by the following step of reactions M+X2→MX2 3MX2+X2→M3X8 M3X8+N2CO3→NX+CO2+M3O4 How much metal(M) is consumed to produce 206 g of NX? (at wt of M = 56, N = 23, X = 80)
Answer» NX is produced by the following step of reactions $M + X_{2} \to M X_{2}$ $3 M X_{2} + X_{2} \to M_{3} X_{8}$ $M_{3} X_{8} + N_{2} C O_{3} \to N X + C O_{2} + M_{3} O_{4}$ How much metal(M) is consumed to produce 206 g of NX? (at wt of M = 56, N = 23, X = 80)

Discussion

22.	Which of the following is true for inductive effect?
Answer» Which of the following is true for inductive effect?

Discussion

23.	25.2.5ml of 2/5M weak monoacidic base (kb=10 to the power -12 at 25 degree Celsius) is titrated with 2/15M Hcl in water at 25 degree Celsius. Find the concentration of H plus ions at equivalence point. (kw=10 to the power -14 at 25 degree Celsius)
Answer» 25.2.5ml of 2/5M weak monoacidic base (kb=10 to the power -12 at 25 degree Celsius) is titrated with 2/15M Hcl in water at 25 degree Celsius. Find the concentration of H plus ions at equivalence point. (kw=10 to the power -14 at 25 degree Celsius)

Discussion

24.	a certain electronic transition from an excited state to ground state of hydrogen atom in one or more steps give rise to 4 lines in the ultraviolet region of the spectrum how many lines does this transition produced in the infrared region of the spectrum
Answer» a certain electronic transition from an excited state to ground state of hydrogen atom in one or more steps give rise to 4 lines in the ultraviolet region of the spectrum how many lines does this transition produced in the infrared region of the spectrum

Discussion

25.	10 g C reacts with 100 g Cl2 to form CCl4 .Mass of CCl4 formed and mass of residual CO2 ?
Answer» 10 g C reacts with 100 g Cl2 to form CCl4 .Mass of CCl4 formed and mass of residual CO2 ?

Discussion

26.	The atomic numbers of the three elements X, Y and Z are 2, 6 and 10 respectively.(i) Which two elements belong to the same group?(ii) Which two elements belong to the same period?Give reasons for your choice.
Answer» The atomic numbers of the three elements X, Y and Z are 2, 6 and 10 respectively. (i) Which two elements belong to the same group? (ii) Which two elements belong to the same period? Give reasons for your choice.

26.

The atomic numbers of the three elements X, Y and Z are 2, 6 and 10 respectively.(i) Which two elements belong to the same group?(ii) Which two elements belong to the same period?Give reasons for your choice.

Answer»

The atomic numbers of the three elements X, Y and Z are 2, 6 and 10 respectively.

(i) Which two elements belong to the same group?

(ii) Which two elements belong to the same period?

Give reasons for your choice.

Discussion

27.	Ag\|AgCl\|Cl−(C2)\|\|Cl−(C1)\|AgCl\|Ag for this cell ΔG is negative if:
Answer» $A g \| A g C l \| C l^{-} (C_{2}) \| \| C l^{-} (C_{1}) \| A g C l \| A g for this cell Δ G$ is negative if:

Discussion

28.	Which one of the following does not exhibit the phenomenon of mutarotation?
Answer» Which one of the following does not exhibit the phenomenon of mutarotation?

Discussion

29.	is strain dimensionless ?
Answer» is strain dimensionless ?

Discussion

30.	A mixture of N O2 and N2O4 . Average molecular weight is 58. Then determine percentage composition of NO2andN2O4.
Answer» A mixture of N O2 and N2O4 . Average molecular weight is 58. Then determine percentage composition of NO2andN2O4.

Discussion

31.	Number of compounds which are more reactive than towards electrophilic substitution reaction
Answer» Number of compounds which are more reactive than towards electrophilic substitution reaction

Discussion

32.	50 sucrose solution which is 40% by mass is heated till it become 50% by mass . water lost from 100g of the solution
Answer» 50 sucrose solution which is 40% by mass is heated till it become 50% by mass . water lost from 100g of the solution

Discussion

33.	THE CORRECT INCREASING ORDER OF H-M-H BOND ANGLE IN NH3 , PH3 , SBH3 , BiH3 is--------
Answer» THE CORRECT INCREASING ORDER OF H-M-H BOND ANGLE IN NH3 , PH3 , SBH3 , BiH3 is--------

Discussion

34.	A motorboat covers a given distance in 6 hours moving downstream on a river. It covers same distance in 10 hours moving upstream . The time taken to cover the same distance in still water isa. 9hours b. 7.5hours c. 6.5 hoursd. 8hours
Answer» A motorboat covers a given distance in 6 hours moving downstream on a river. It covers same distance in 10 hours moving upstream . The time taken to cover the same distance in still water is a. 9hours b. 7.5hours c. 6.5 hours d. 8hours

Discussion

35.	Correct order of thermal stability of alkali metal chlorides
Answer» Correct order of thermal stability of alkali metal chlorides

Discussion

36.	The hybridisation of boron in BH3 molecule is .
Answer» The hybridisation of boron in $B H_{3}$ molecule is .

Discussion

37.	What are point objects and what are extended object? And differentiate between them
Answer» What are point objects and what are extended object? And differentiate between them

Discussion

38.	How to find valency of elements having atomic no. greater than 20
Answer» How to find valency of elements having atomic no. greater than 20

Discussion

39.	The complex ion which has no 'd' electrons in the central metal atom is:
Answer» The complex ion which has no 'd' electrons in the central metal atom is:

Discussion

40.	Select the false statements, during concentration of ore.
Answer» Select the false statements, during concentration of ore.

Discussion

41.	The molal elevation constant for water is 0.512Kkg/mol. If one mole of glucose is dissolved in 100g of water the boiling point is elevated by
Answer» The molal elevation constant for water is 0.512Kkg/mol. If one mole of glucose is dissolved in 100g of water the boiling point is elevated by

Discussion

42.	(a) What is Brownian motion? Draw a diagram to show the movement of a particle (like a pollen grain) during Brownian motion.(b) In a beam of sunlight entering a room, we can sometimes see dust particles moving in a haphazard way in the air. Why do these dust particles move?
Answer» (a) What is Brownian motion? Draw a diagram to show the movement of a particle (like a pollen grain) during Brownian motion. (b) In a beam of sunlight entering a room, we can sometimes see dust particles moving in a haphazard way in the air. Why do these dust particles move?

Discussion

43.	33. If the initial concentration of reactants is reduced to half in a reaction, then the half life of a reaction becomes two times. The order of the reaction is 0 1 2 3
Answer» 33. If the initial concentration of reactants is reduced to half in a reaction, then the half life of a reaction becomes two times. The order of the reaction is 0 1 2 3

Discussion

44.	ntMolecule which follows octet rulen ntClO2n ntNOn ntNO2n ntN2O3n ntwhy?n
Answer» ntMolecule which follows octet rulen ntClO2n ntNOn ntNO2n ntN2O3n ntwhy?n

Discussion

45.	Why electron donating groups decreases acidic strength at ortho and para?
Answer» Why electron donating groups decreases acidic strength at ortho and para?

Discussion

46.	IN 200ml, 0.5molar solution of HNO_{3, }200ml of 0.1 molar Nacl is added. Find molarity of both the solutes
Answer» IN 200ml, 0.5molar solution of HNO_{3, }200ml of 0.1 molar Nacl is added. Find molarity of both the solutes

Discussion

47.	7. The dissociation of H2O into H and OH ions is endothermic. The H+ ion concentration on increasing temperature(a) increases b) decreases (c) becomes half(d) r emains same
Answer» 7. The dissociation of H2O into H and OH ions is endothermic. The H+ ion concentration on increasing temperature(a) increases b) decreases (c) becomes half(d) r emains same

Discussion

48.	Acetic acid undergoes dimerisation in benzene. What will be its van't Hoff factor valure if α is 100%? Options: 0.5 2 1 Infinite
Answer» Acetic acid undergoes dimerisation in benzene. What will be its van't Hoff factor valure if α is 100%? Options: 0.5 2 1 Infinite

Discussion

49.	Standard molar enthalpy of formation, ΔfH⊖ is just a special case of enthalpy of reaction, ΔrH⊖ . Is the ΔrH⊖ for the following reaction same as ΔfH⊖ ? Give reason for your answer. Ca0(s)+CO2(g)→CaCO3(s);ΔfH⊖=−178.3 kJ mol−1
Answer» Standard molar enthalpy of formation, $Δ_{f} H^{⊖}$ is just a special case of enthalpy of reaction, $Δ_{r} H^{⊖}$ . Is the $Δ_{r} H^{⊖}$ for the following reaction same as $Δ_{f} H^{⊖}$ ? Give reason for your answer. $C a 0 (s) + C O_{2} (g) \to C a C O_{3} (s); Δ_{f} H^{⊖} = - 178.3 k J m o l^{- 1}$

Discussion

50.	a 1.00 g sample of H2O2 solution containing X percent H2O2 by weight requires X ml of a KMnO4 solution for complete oxidation under acidic conditions.calculate the normality of the KMnO4 solution.
Answer» a 1.00 g sample of H2O2 solution containing X percent H2O2 by weight requires X ml of a KMnO4 solution for complete oxidation under acidic conditions.calculate the normality of the KMnO4 solution.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A 24.6 MeV alpha particle moves towards gold nucleus (atomic number 79). Calculate the distance of closest approach of alpha particle.

If the density of a certain gas at 30∘C and 768 torr is 1.35 kg/m3 , its density at STP would be:

Van't Hoff factor for Ca(NO3)2 on 100% dissociation.

Which one of the following is 1-bromo-3-methyl butane?

What are interstitial compounds? Why are such compounds well known for transition metals?

which is not a disproportionation reaction?(a)P4+OH^- --->PH3+H2PO2^-(b)Cl2+OH^- --->Cl^-+OCl(c)BR2+OH^- --->Br^- +BrO3^-(d)2KClO3 --->2KCl+3O2

Average lifetime of a hydrogen atom excited to n = 2 state is 10−8 s. Find the number of revolutions made by the electron on the avera ge before it jumps to the ground state.

34.What is the composition of seridite ore

What is the structural formula of 3-ethyl-4-(1-methylpropyl)-2,2-dimethyloctane ?

The decreasing base strength of OH−, NH−2, HC≡C− and CH3CH−2 is:

NH3 IS PYRAMIDAL BUT NH4+ IS TETRAHEDRAL

The photoelectrons emitted from a given cathode on the incidence of a given monochromatic beam of light have

A boat carrying a number of stones is floating in awater tank. If the stones are unloaded into water, thewater level in the tank will 1)Pemain unchanged 2) Rise (3) Fall 4) Rise or fall depends on the number of stonesunloaded

The correct sequence regarding the basic strength of the amines in aqueous solution is(R is CH3):

isotonic solution have the same : a)density b)molar concentration c)normality d) none of thes

What volume of 0.25M Hcl is required to react completely with 22.6g of Na2co3 according to the equation Na2Co3+2Hcl=2Nacl=H20 (2) The molecular mass of organic compound is 78% and and its %composition is 92.4%C and 7.6%H.Find the molecular formula of the compound.

7.How many electrons in sulphur(Z=16) can have n+l=3?

Alkaline earth metals dissolve in liquid ammonia to form bright blue coloured solutions in dilution because of

The unit of length convenient on an atomic scale is known as angstrom and is denoted by A=10^-10m the size of hydrogen atoms is about 0.5 angstrom what is the total atomic volume in m^3 of a mole of hydrogen atom

the breadth of a rectangular sheet is measured as 10.1 cm.the error in measurement is?

NX is produced by the following step of reactions M+X2→MX2 3MX2+X2→M3X8 M3X8+N2CO3→NX+CO2+M3O4 How much metal(M) is consumed to produce 206 g of NX? (at wt of M = 56, N = 23, X = 80)

Which of the following is true for inductive effect?

25.2.5ml of 2/5M weak monoacidic base (kb=10 to the power -12 at 25 degree Celsius) is titrated with 2/15M Hcl in water at 25 degree Celsius. Find the concentration of H plus ions at equivalence point. (kw=10 to the power -14 at 25 degree Celsius)

a certain electronic transition from an excited state to ground state of hydrogen atom in one or more steps give rise to 4 lines in the ultraviolet region of the spectrum how many lines does this transition produced in the infrared region of the spectrum

10 g C reacts with 100 g Cl2 to form CCl4 .Mass of CCl4 formed and mass of residual CO2 ?

The atomic numbers of the three elements X, Y and Z are 2, 6 and 10 respectively.(i) Which two elements belong to the same group?(ii) Which two elements belong to the same period?Give reasons for your choice.

Ag|AgCl|Cl−(C2)||Cl−(C1)|AgCl|Ag for this cell ΔG is negative if:

Which one of the following does not exhibit the phenomenon of mutarotation?

is strain dimensionless ?

A mixture of N O2 and N2O4 . Average molecular weight is 58. Then determine percentage composition of NO2andN2O4.

Number of compounds which are more reactive than towards electrophilic substitution reaction

50 sucrose solution which is 40% by mass is heated till it become 50% by mass . water lost from 100g of the solution

THE CORRECT INCREASING ORDER OF H-M-H BOND ANGLE IN NH3 , PH3 , SBH3 , BiH3 is--------

A motorboat covers a given distance in 6 hours moving downstream on a river. It covers same distance in 10 hours moving upstream . The time taken to cover the same distance in still water isa. 9hours b. 7.5hours c. 6.5 hoursd. 8hours

Correct order of thermal stability of alkali metal chlorides

The hybridisation of boron in BH3 molecule is .

What are point objects and what are extended object? And differentiate between them

How to find valency of elements having atomic no. greater than 20

The complex ion which has no 'd' electrons in the central metal atom is:

Select the false statements, during concentration of ore.

The molal elevation constant for water is 0.512Kkg/mol. If one mole of glucose is dissolved in 100g of water the boiling point is elevated by

(a) What is Brownian motion? Draw a diagram to show the movement of a particle (like a pollen grain) during Brownian motion.​(b) In a beam of sunlight entering a room, we can sometimes see dust particles moving in a haphazard way in the air. Why do these dust particles move?

33. If the initial concentration of reactants is reduced to half in a reaction, then the half life of a reaction becomes two times. The order of the reaction is 0 1 2 3

ntMolecule which follows octet rulen ntClO2n ntNOn ntNO2n ntN2O3n ntwhy?n

Why electron donating groups decreases acidic strength at ortho and para?

IN 200ml, 0.5molar solution of HNO_{3, }200ml of 0.1 molar Nacl is added. Find molarity of both the solutes

7. The dissociation of H2O into H and OH ions is endothermic. The H+ ion concentration on increasing temperature(a) increases b) decreases (c) becomes half(d) r emains same

Acetic acid undergoes dimerisation in benzene. What will be its van't Hoff factor valure if α is 100%? Options: 0.5 2 1 Infinite

Standard molar enthalpy of formation, ΔfH⊖ is just a special case of enthalpy of reaction, ΔrH⊖ . Is the ΔrH⊖ for the following reaction same as ΔfH⊖ ? Give reason for your answer. Ca0(s)+CO2(g)→CaCO3(s);ΔfH⊖=−178.3 kJ mol−1

a 1.00 g sample of H2O2 solution containing X percent H2O2 by weight requires X ml of a KMnO4 solution for complete oxidation under acidic conditions.calculate the normality of the KMnO4 solution.

(a) What is Brownian motion? Draw a diagram to show the movement of a particle (like a pollen grain) during Brownian motion.(b) In a beam of sunlight entering a room, we can sometimes see dust particles moving in a haphazard way in the air. Why do these dust particles move?