46295 + Interview Questions in Chemistry

1.	The resistance and conductivity of 0.02 M KCl solution are 82.4 ohm and 0.002768Scm−1, respectively. When filled with 0.005NK2SO4, the solution had a resistance of 324 ohm. Calculate conductivity of K2SO4 solution (conductance and cell constant calculated in previous problems are 3.086×10(−3)S and 0.228cm−1)
Answer» The resistance and conductivity of 0.02 M KCl solution are 82.4 ohm and $0.002768 S c m^{- 1}$ , respectively. When filled with $0.005 N K_{2} S O_{4}$ , the solution had a resistance of 324 ohm. Calculate conductivity of $K_{2} S O_{4}$ solution (conductance and cell constant calculated in previous problems are $3.086 \times 10^{(- 3)} S$ and $0.228 c m^{- 1})$

Discussion

2.	Zc sulphide exists in two different structural forms as zincblende (FCC) and Wurtzite (HCP). What will be the coordinationnumber of cation and anion in both the structures?
Answer» Zc sulphide exists in two different structural forms as zincblende (FCC) and Wurtzite (HCP). What will be the coordinationnumber of cation and anion in both the structures?

Discussion

3.	The Enthalpy of formation of the compound is
Answer» The Enthalpy of formation of the compound is

Discussion

4.	Best method for preparation of given compound by williamson's ether synthesis is
Answer» Best method for preparation of given compound by williamson's ether synthesis is

Discussion

5.	The number of enantiomeric pairs that can be grouped from the products formed by the monochlorination of the compound given above is .
Answer» The number of enantiomeric pairs that can be grouped from the products formed by the monochlorination of the compound given above is .

Discussion

6.	The concentration of HCN and NaCN in a solution is 0.01 M each. Calculate the concentration of hydroxyl ions if the dissociation constant of HCN is 7.2×10−10.
Answer» The concentration of $H C N$ and $N a C N$ in a solution is $0.01 M$ each. Calculate the concentration of hydroxyl ions if the dissociation constant of $H C N$ is $7.2 \times 10^{- 10}$ .

Discussion

7.	Normality of a solution is the number of ______ of solute per liter of the solution.
Answer» Normality of a solution is the number of ______ of solute per liter of the solution.

Discussion

8.	Interhalogens are more reactive than halogens why
Answer» Interhalogens are more reactive than halogens why

Discussion

9.	0.5 molal aq solution of a weak a HX is 20 % ionised if Kf for water is 1.86 Kkg mol-1 the lowering in freezing point of the solution is
Answer» 0.5 molal aq solution of a weak a HX is 20 % ionised if Kf for water is 1.86 Kkg mol-1 the lowering in freezing point of the solution is

Discussion

10.	ntCalculate the percentage ionization of 0.01M acetic acid in 0.1M HCL Ka of acetic acid is 1.8 10-5(10 to the power 5)n
Answer» ntCalculate the percentage ionization of 0.01M acetic acid in 0.1M HCL Ka of acetic acid is 1.8 10-5(10 to the power 5)n

Discussion

11.	The solubility product of AgCl at 25∘C is 1×10−10. A solution of Ag+ at a concentration of 4×10−3 M just fails to yield a precipitate of AgCl with a concentration of 1×10−3 M of Cl− when the concentration of NH3 in the solution is 2×10−2 M. Calculate the equilibrium constant for [Ag(NH3)2]+⇌Ag++2NH3
Answer» The solubility product of $A g C l$ at $25^{\circ} C$ is $1 \times 10^{- 10}$ . A solution of $A g^{+}$ at a concentration of $4 \times 10^{- 3} M$ just fails to yield a precipitate of $A g C l$ with a concentration of $1 \times 10^{- 3} M$ of $C l^{-}$ when the concentration of $N H_{3}$ in the solution is $2 \times 10^{- 2} M$ . Calculate the equilibrium constant for $[A g (N H_{3})_{2}]^{+} ⇌ A g^{+} + 2 N H_{3}$

Discussion

12.	In a gamma decay process the internal energy of a nucleus of mass M decreases , a gamma photon of energy E and linear momentum E/c is emitted and the nucleus recoils. Find the decrease in internal energy.
Answer» In a gamma decay process the internal energy of a nucleus of mass M decreases , a gamma photon of energy E and linear momentum E/c is emitted and the nucleus recoils. Find the decrease in internal energy.

Discussion

13.	Acetone is the major product in:I) H3C−CH=CH2H+/H2O−−−−−→II) H3C−C≡CHHg2+/H2SO4 (aq.)−−−−−−−−−−−→II) H3C−C≡CHBH3, THF−−−−−−−→H2O2/OH−
Answer» Acetone is the major product in: $I) H_{3} C - C H = C H_{2} H^{+} / H_{2} O - ---- \to$ $I I) H_{3} C - C \equiv C H H g^{2 +} / H_{2} S O_{4} (a q .) - ---------- \to$ $I I) H_{3} C - C \equiv C H B H_{3}, T H F - ------ \to H_{2} O_{2} / O H^{-}$

Discussion

14.	If a given quantity of PCl5 is heated to 250 degree celsius and allowed to come to equilibrium at atmospheric pressure it is found to be dissociated to the extent of 80% into PCl3 and chlorine. If now, the pressure on this mixture is increased so that finally the equilibrium mixture occupies only one half of its original volume ( temperature maintained constant).i) What will the % dissociation at the new pressure?ii) What will be the effect of adding He gas keeping the volume fixed at V/2?
Answer» If a given quantity of PCl5 is heated to 250 degree celsius and allowed to come to equilibrium at atmospheric pressure it is found to be dissociated to the extent of 80% into PCl3 and chlorine. If now, the pressure on this mixture is increased so that finally the equilibrium mixture occupies only one half of its original volume ( temperature maintained constant).i) What will the % dissociation at the new pressure?ii) What will be the effect of adding He gas keeping the volume fixed at V/2?

Discussion

15.	The mass fraction of hydrogen in a compound of group 14 element is 0.125. The hydride of the element has the formula
Answer» The mass fraction of hydrogen in a compound of group 14 element is 0.125. The hydride of the element has the formula

Discussion

16.	Compare the boiling points among the hydride of group 17HF,HCL,HBR,HI
Answer» Compare the boiling points among the hydride of group 17 HF,HCL,HBR,HI

Discussion

17.	The half life period of a substance is 50min at a certain initial concentration .When concentration is reduced to one half ,half life is found to be 25 min .What is the order of reaction?
Answer» The half life period of a substance is 50min at a certain initial concentration .When concentration is reduced to one half ,half life is found to be 25 min .What is the order of reaction?

Discussion

18.	In the figure shown, velocity and pressure of the liquid at cross section 2 respectively are given by (if P0 is the atmospheric pressure)
Answer» In the figure shown, velocity and pressure of the liquid at cross section 2 respectively are given by (if $P_{0}$ is the atmospheric pressure)

Discussion

19.	The number of structures of C3H6O which can show stereoisomerism are:
Answer» The number of structures of $C_{3} H_{6} O$ which can show stereoisomerism are:

Discussion

20.	Which one of the following alkenes will react faster with H2 under catalytic hydrogenation condtions?(R = Alkyl substituent)
Answer» Which one of the following alkenes will react faster with $H_{2}$ under catalytic hydrogenation condtions? (R = Alkyl substituent)

Discussion

21.	Why should the monomer used in addition polymerisation through free radical pathway be very pure?
Answer» Why should the monomer used in addition polymerisation through free radical pathway be very pure?

Discussion

22.	The pH of a mixture of 0.01M HCI and 0.1M CH3COOH is approximately
Answer» The pH of a mixture of 0.01M HCI and 0.1M CH3COOH is approximately

Discussion

23.	Ascorbic acid (C6H8O6) is a common antioxidant that protects our bodies against radicals. In the redox equation below that occurs in our stomach, which of the following pairs identifies the reducing and oxidizing agents respectively? C6H8O6+2H++2NO−2→C6H6O6+2H2O+2NO
Answer» Ascorbic acid $(C_{6} H_{8} O_{6})$ is a common antioxidant that protects our bodies against radicals. In the redox equation below that occurs in our stomach, which of the following pairs identifies the reducing and oxidizing agents respectively? $C_{6} H_{8} O_{6} + 2 H^{+} + 2 N O_{2}^{-} \to C_{6} H_{6} O_{6} + 2 H_{2} O + 2 N O$

Discussion

24.	If an electron and photon propagate in the form of waves having the same wavelength it implies that they have the same Momentum but not the same energy kindly explain this statement as E=pc
Answer» If an electron and photon propagate in the form of waves having the same wavelength it implies that they have the same Momentum but not the same energy kindly explain this statement as E=pc

Discussion

25.	Calculate the angular orbital momentum of electron in first shell of hydrogen atom.
Answer» Calculate the angular orbital momentum of electron in first shell of hydrogen atom.

Discussion

26.	basic differences between alpha particle and beta particle
Answer» basic differences between alpha particle and beta particle

Discussion

27.	Values of first four ionisation potential of anelements are 68, 370, 400, 485. It belongs towhich of the following electronic configuration:-Valance (2) 1s2 2s2 2p1(4) (1) and (3) bothP'show(1) 1s2 2s1(3) 1s2 2s2 2p6 3s1
Answer» Values of first four ionisation potential of anelements are 68, 370, 400, 485. It belongs towhich of the following electronic configuration:-Valance (2) 1s2 2s2 2p1(4) (1) and (3) bothP'show(1) 1s2 2s1(3) 1s2 2s2 2p6 3s1

Discussion

28.	A refrigerator operates between 120 kPa and 800 kPa in an ideal vapor compression cycle with R−134a as the refrigerant. The refrigerant enters the compressor as saturated vapor and leaves the condenser as saturated liquid. The mass flow rate of the refrigerant is 0.2kg/s. Properties for R−134a are as follows:Saturated R- 134aP(kPa)T(∘C)hf(kJ/kg)hs(kJ/kg)sf(kJ/kgK)sg(kJ/kgK)120−22.3222.52370.0930.9580031.3195.5267.30.3540.918Superheated R- 134aP(kPa)T(∘C)h(kJ/kg)s(kJ/kgK)80040276.450.95The rate at which heat is extracted, in kJ/s from the refrigerated space is
Answer» A refrigerator operates between $120 k P a$ and $800 k P a$ in an ideal vapor compression cycle with $R - 134 a$ as the refrigerant. The refrigerant enters the compressor as saturated vapor and leaves the condenser as saturated liquid. The mass flow rate of the refrigerant is $0.2 k g / s .$ Properties for $R - 134 a$ are as follows: $\begin{matrix} Saturated R- 134a P (k P_{a}) & T (^{\circ} C) & h_{f} (k J / k g) & h_{s} (k J / k g) & s_{f} (k J / k g K) & s_{g} (k J / k g K) 120 & - 22.32 & 22.5 & 237 & 0.093 & 0.95 800 & 31.31 & 95.5 & 267.3 & 0.354 & 0.918 Superheated R- 134a P (k P_{a}) & T (^{\circ} C) & h (k J / k g) & s (k J / k g K) 800 & 40 & 276.45 & 0.95 \end{matrix}$ The rate at which heat is extracted, in $k J / s$ from the refrigerated space is

Discussion

29.	Calculate the number of formula units of[Ag(NH3)2]Cl in 1 kilomole of [Ag(NH3)2]Cl.
Answer» Calculate the number of formula units of $[A g (N H_{3})_{2}] C l$ in 1 kilomole of $[A g (N H_{3})_{2}] C l$ .

Discussion

30.	Why does hyperconjugation happens? well i m not asking about any specific molecule. what if I say that there is a molecule which is having hyper conjugation and I'm not allowing it to do so......
Answer» Why does hyperconjugation happens? well i m not asking about any specific molecule. what if I say that there is a molecule which is having hyper conjugation and I'm not allowing it to do so......

Discussion

31.	What is alpha, beta and Gama hydrogen atoms?
Answer» What is alpha, beta and Gama hydrogen atoms?

Discussion

32.	The species that exhibits the highest Rf value in a thin layer chromatogram using a non polar solvent on a silica gel is
Answer» The species that exhibits the highest R $_{f}$ value in a thin layer chromatogram using a non polar solvent on a silica gel is

Discussion

33.	1ml of H_2O_{2 }solution gives 10ml of O_2 at N.T.P.It is 1.)10vol H_2 O_{2 }2.)20vol H_2O_{2 }3.)30vol H_2O_2 4.)40vol H_2O_{}
Answer» 1ml of H_2O_{2 }solution gives 10ml of O_2 at N.T.P.It is 1.)10vol H_2 O_{2 }2.)20vol H_2O_{2 }3.)30vol H_2O_2 4.)40vol H_2O_{}

Discussion

34.	Calculate the no. of atoms of hydrogen present in 1 dozen of hydrogen gas.
Answer» Calculate the no. of atoms of hydrogen present in 1 dozen of hydrogen gas.

Discussion

35.	When PbO2 reacts with conc HNO3, the gas evolved is:
Answer» When $P b O_{2}$ reacts with conc $H N O_{3}$ , the gas evolved is:

Discussion

36.	23.Which of the following statements is not correct (1)The number of bravais lattices in which a crystal can be categorized is 14 (2)The fraction of the total volume occupied by the atoms in a primitive cell is 0.52 (3)Molecular solids are generally volatile (4)The number of carbon atoms in a unit cell of diamond is 4
Answer» 23.Which of the following statements is not correct (1)The number of bravais lattices in which a crystal can be categorized is 14 (2)The fraction of the total volume occupied by the atoms in a primitive cell is 0.52 (3)Molecular solids are generally volatile (4)The number of carbon atoms in a unit cell of diamond is 4

Discussion

37.	What volume of air at 1 atm and 273 K containing 21% of oxygen by volume is required to completely burn sulphur (S8) present in 200 g of sample, which contains 20% inert material which does not burn. Sulpur burns according to the reaction18S8(s)+O2(g)→SO2(g)
Answer» What volume of air at $1 a t m$ and $273 K$ containing 21% of oxygen by volume is required to completely burn sulphur $(S_{8})$ present in $200 g$ of sample, which contains $20 %$ inert material which does not burn. Sulpur burns according to the reaction $\frac{1}{8} S_{8} (s) + O_{2} (g) \to S O_{2} (g)$

Discussion

38.	what change in the size of fluorine occur when it gains 1e^_ and why
Answer» what change in the size of fluorine occur when it gains 1e^_ and why

Discussion

39.	In the following compound, according to the rules of IUPAC nomenclature, the groups designated as A, B, C will be numbered respectively as:
Answer» In the following compound, according to the rules of IUPAC nomenclature, the groups designated as A, B, C will be numbered respectively as:

39.

In the following compound, according to the rules of IUPAC nomenclature, the groups designated as A, B, C will be numbered respectively as:

Answer»

In the following compound, according to the rules of IUPAC nomenclature, the groups designated as A, B, C will be numbered respectively as:

Discussion

40.	Calculate the value of Z10.WhereZ = Co-ordination number of 2D-square close packing +Co-ordination number of 2D-hcp+Co-ordination number of 3D-square close packing+Co-ordination number of 3D, ABCABC ………Packing+Co-ordination number of 3D, ABAB ………Packing
Answer» Calculate the value of $\frac{Z}{10} .$ Where $Z = Co-ordination number of 2D-square close packing + Co-ordination number of 2D-hcp + Co-ordination number of 3D-square close packing + Co-ordination number of 3D, ABCABC \dots\dots\dotsPacking + Co-ordination number of 3D, ABAB \dots\dots\dotsPacking$

Discussion

41.	Which among the following is not a type of silk?
Answer» Which among the following is not a type of silk?

Discussion

42.	41. Pure O2 diffuses through an aperture in 224 second , whereas mixture of O2 and another gas containing 80% O2 diffuses from the same in 234 second. What is the molecular mass of gas?
Answer» 41. Pure O2 diffuses through an aperture in 224 second , whereas mixture of O2 and another gas containing 80% O2 diffuses from the same in 234 second. What is the molecular mass of gas?

Discussion

43.	suggest the order of stability in betweem alllylic benzylic alkylic and vinylic ,carbocation and carboanion.state with explainatio
Answer» suggest the order of stability in betweem alllylic benzylic alkylic and vinylic ,carbocation and carboanion.state with explainatio

Discussion

44.	The bond energy of H2 Br2 and HBrIs 438,192,364Find the enthalpy of reaction H2 + Br2 --2HBr
Answer» The bond energy of H2 Br2 and HBr Is 438,192,364 Find the enthalpy of reaction H2 + Br2 --2HBr

Discussion

45.	what is secondary battery? write the mechanism of recharging of lead storage battery with the help of chemical reaction
Answer» what is secondary battery? write the mechanism of recharging of lead storage battery with the help of chemical reaction

Discussion

46.	The orbital angular momentum of a 4p electron will be :
Answer» The orbital angular momentum of a 4p electron will be :

Discussion

47.	How many sawhorse projection in ethane
Answer» How many sawhorse projection in ethane

Discussion

48.	Find the molecular weight of smallest alkane which is having group as side chain.give a proper explanation
Answer» Find the molecular weight of smallest alkane which is having group as side chain.give a proper explanation

Discussion

49.	CH3−CH2−O\|\|C−OHPCl3−−−→ NH3−−−→Δ OBr⊖−−−→ The product is :
Answer» $C H_{3} - C H_{2} - O \| \| C - O H P C l_{3} - -- \to N H_{3} - -- \to Δ O B r^{⊖} - -- \to$ The product is :

Discussion

50.	the oxidation of S in ( CH_3)_2SO i
Answer» the oxidation of S in ( CH_3)_2SO i

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Zc sulphide exists in two different structural forms as zincblende (FCC) and Wurtzite (HCP). What will be the coordinationnumber of cation and anion in both the structures?

The Enthalpy of formation of the compound is

Best method for preparation of given compound by williamson's ether synthesis is

The number of enantiomeric pairs that can be grouped from the products formed by the monochlorination of the compound given above is .

The concentration of HCN and NaCN in a solution is 0.01 M each. Calculate the concentration of hydroxyl ions if the dissociation constant of HCN is 7.2×10−10.

Normality of a solution is the number of ______ of solute per liter of the solution.

Interhalogens are more reactive than halogens why

0.5 molal aq solution of a weak a HX is 20 % ionised if Kf for water is 1.86 Kkg mol-1 the lowering in freezing point of the solution is

ntCalculate the percentage ionization of 0.01M acetic acid in 0.1M HCL Ka of acetic acid is 1.8 10-5(10 to the power 5)n

In a gamma decay process the internal energy of a nucleus of mass M decreases , a gamma photon of energy E and linear momentum E/c is emitted and the nucleus recoils. Find the decrease in internal energy.

Acetone is the major product in:I) H3C−CH=CH2H+/H2O−−−−−→II) H3C−C≡CHHg2+/H2SO4 (aq.)−−−−−−−−−−−→II) H3C−C≡CHBH3, THF−−−−−−−→H2O2/OH−

The mass fraction of hydrogen in a compound of group 14 element is 0.125. The hydride of the element has the formula

Compare the boiling points among the hydride of group 17HF,HCL,HBR,HI

The half life period of a substance is 50min at a certain initial concentration .When concentration is reduced to one half ,half life is found to be 25 min .What is the order of reaction?

In the figure shown, velocity and pressure of the liquid at cross section 2 respectively are given by (if P0 is the atmospheric pressure)

The number of structures of C3H6O which can show stereoisomerism are:

Which one of the following alkenes will react faster with H2 under catalytic hydrogenation condtions?(R = Alkyl substituent)

Why should the monomer used in addition polymerisation through free radical pathway be very pure?

The pH of a mixture of 0.01M HCI and 0.1M CH3COOH is approximately

Ascorbic acid (C6H8O6) is a common antioxidant that protects our bodies against radicals. In the redox equation below that occurs in our stomach, which of the following pairs identifies the reducing and oxidizing agents respectively? C6H8O6+2H++2NO−2→C6H6O6+2H2O+2NO

If an electron and photon propagate in the form of waves having the same wavelength it implies that they have the same Momentum but not the same energy kindly explain this statement as E=pc

Calculate the angular orbital momentum of electron in first shell of hydrogen atom.

basic differences between alpha particle and beta particle

Values of first four ionisation potential of anelements are 68, 370, 400, 485. It belongs towhich of the following electronic configuration:-Valance (2) 1s2 2s2 2p1(4) (1) and (3) bothP'show(1) 1s2 2s1(3) 1s2 2s2 2p6 3s1

Calculate the number of formula units of[Ag(NH3)2]Cl in 1 kilomole of [Ag(NH3)2]Cl.

Why does hyperconjugation happens? well i m not asking about any specific molecule. what if I say that there is a molecule which is having hyper conjugation and I'm not allowing it to do so......

What is alpha, beta and Gama hydrogen atoms?

The species that exhibits the highest Rf value in a thin layer chromatogram using a non polar solvent on a silica gel is

1ml of H_2O_{2 }solution gives 10ml of O_2 at N.T.P.It is 1.)10vol H_2 O_{2 }2.)20vol H_2O_{2 }3.)30vol H_2O_2 4.)40vol H_2O_{}

Calculate the no. of atoms of hydrogen present in 1 dozen of hydrogen gas.

When PbO2 reacts with conc HNO3, the gas evolved is:

What volume of air at 1 atm and 273 K containing 21% of oxygen by volume is required to completely burn sulphur (S8) present in 200 g of sample, which contains 20% inert material which does not burn. Sulpur burns according to the reaction18S8(s)+O2(g)→SO2(g)

what change in the size of fluorine occur when it gains 1e^_ and why

In the following compound, according to the rules of IUPAC nomenclature, the groups designated as A, B, C will be numbered respectively as:

Calculate the value of Z10.WhereZ = Co-ordination number of 2D-square close packing +Co-ordination number of 2D-hcp+Co-ordination number of 3D-square close packing+Co-ordination number of 3D, ABCABC ………Packing+Co-ordination number of 3D, ABAB ………Packing

Which among the following is not a type of silk?

41. Pure O2 diffuses through an aperture in 224 second , whereas mixture of O2 and another gas containing 80% O2 diffuses from the same in 234 second. What is the molecular mass of gas?

suggest the order of stability in betweem alllylic benzylic alkylic and vinylic ,carbocation and carboanion.state with explainatio

The bond energy of H2 Br2 and HBrIs 438,192,364Find the enthalpy of reaction H2 + Br2 --2HBr

what is secondary battery? write the mechanism of recharging of lead storage battery with the help of chemical reaction

The orbital angular momentum of a 4p electron will be :

How many sawhorse projection in ethane

Find the molecular weight of smallest alkane which is having group as side chain.give a proper explanation

CH3−CH2−O||C−OHPCl3−−−→ NH3−−−→Δ OBr⊖−−−→ The product is :

the oxidation of S in ( CH_3)_2SO i