46295 + Interview Questions in Chemistry

1.	An aqueous solution has 5% urea and 10% glucose by weight. What will be the freezing point of the solution ? (Kf of water= 1.86)
Answer» An aqueous solution has 5% urea and 10% glucose by weight. What will be the freezing point of the solution ? (Kf of water= 1.86)

Discussion

2.	7.What is splitting term?
Answer» 7.What is splitting term?

Discussion

3.	In the photoelectric experiment, if we use a monochromatic light, the photoelectric current vs voltage curve is as shown. If work function of the metal is 2eV, estimate the power of light used. (Assume efficiency of photo emission = 10−3%, i.e., number of photoelectrons emitted are 10−3% of number of photons incident on metal)
Answer» In the photoelectric experiment, if we use a monochromatic light, the photoelectric current vs voltage curve is as shown. If work function of the metal is 2eV, estimate the power of light used. (Assume efficiency of photo emission = $10^{- 3} %$ , i.e., number of photoelectrons emitted are $10^{- 3} %$ of number of photons incident on metal)

3.

In the photoelectric experiment, if we use a monochromatic light, the photoelectric current vs voltage curve is as shown. If work function of the metal is 2eV, estimate the power of light used. (Assume efficiency of photo emission = 10−3%, i.e., number of photoelectrons emitted are 10−3% of number of photons incident on metal)

Answer»

In the photoelectric experiment, if we use a monochromatic light, the photoelectric current vs voltage curve is as shown. If work function of the metal is 2eV, estimate the power of light used. (Assume efficiency of photo emission = $10^{- 3} %$ , i.e., number of photoelectrons emitted are $10^{- 3} %$ of number of photons incident on metal)

Discussion

4.	What is the number of unit cell in 18 grams of an element of atomic mass 27 g / mol ,if it forms fcc packing of cell edge 540 pm
Answer» What is the number of unit cell in 18 grams of an element of atomic mass 27 g / mol ,if it forms fcc packing of cell edge 540 pm

Discussion

5.	How long (in seconds) a current of 3 amp has to be passed through a solution of silver nitrate to coat a metal surface of 80 cm2 with a 0.005 mm thick layer? Density of silver is 10.5 g cm−3.(Give your answer in the nearest interger value)
Answer» How long (in seconds) a current of $3 amp$ has to be passed through a solution of silver nitrate to coat a metal surface of $80 {cm}^{2}$ with a $0.005 mm$ thick layer? Density of silver is $10.5 {g cm}^{- 3}$ . (Give your answer in the nearest interger value)

Discussion

6.	The molecular formula of a commercial resin used for exchanging ions in water softening is C8H7SO−3Na+ (Molecular weight=206). The maximum uptake of Ca2+ ions by the resin when expressed in mole per gram resin was found to be 1x. Find the value of x.
Answer» The molecular formula of a commercial resin used for exchanging ions in water softening is $C_{8} H_{7} S O_{3}^{-} N a^{+}$ $(M o l e c u l a r w e i g h t = 206)$ . The maximum uptake of $C a^{2 +}$ ions by the resin when expressed in mole per gram resin was found to be $\frac{1}{x}$ . Find the value of $x$ .

Discussion

7.	Why carbon cannot form more than triple bond with other carbon atom? Why only 3 is possible ?
Answer» Why carbon cannot form more than triple bond with other carbon atom? Why only 3 is possible ?

Discussion

8.	In which of the following reactions does hydrogen act as an oxidising agent ?
Answer» In which of the following reactions does hydrogen act as an oxidising agent ?

Discussion

9.	Which of the following compounds will exhibit geometrical isomerism?
Answer» Which of the following compounds will exhibit geometrical isomerism?

Discussion

10.	Are K=Ae^-E/RT and Rate=P×Zab×e^-E/RT same? Then how A=Zab×P?
Answer» Are K=Ae^-E/RT and Rate=P×Zab×e^-E/RT same? Then how A=Zab×P?

Discussion

11.	At equilibrium is the concentration of reactants equal to the concentration of the product or are they constant ? What is the difference between being constant and being equal?
Answer» At equilibrium is the concentration of reactants equal to the concentration of the product or are they constant ? What is the difference between being constant and being equal?

Discussion

12.	Which of the following metal chloride gives white ppt and black ppt respectively with aequeous solution of gas (B)
Answer» Which of the following metal chloride gives white ppt and black ppt respectively with aequeous solution of gas (B)

12.

Which of the following metal chloride gives white ppt and black ppt respectively with aequeous solution of gas (B)

Answer»

Which of the following metal chloride gives white ppt and black ppt respectively with aequeous solution of gas (B)

Discussion

13.	the galvanic cellAg AgCl(s), KCI(0.2M) \vert\vert KBr(0.001IM), AgBr(s)\vert AgThe anode is\lbrack Ksp (AgCI) 2.8 x 10-10. KSp (AgBr) 3.3 x 10-13
Answer» the galvanic cellAg AgCl(s), KCI(0.2M) \vert\vert KBr(0.001IM), AgBr(s)\vert AgThe anode is\lbrack Ksp (AgCI) 2.8 x 10-10. KSp (AgBr) 3.3 x 10-13

Discussion

14.	Reaction between1.formic acid and Toluene2.formic acid and methoxy benzene
Answer» Reaction between 1.formic acid and Toluene 2.formic acid and methoxy benzene

Discussion

15.	The reaction AK−→Product, is a zero order while the reaction BK−→Product, is a first order reaction. For what initial concentration of 'A' are the half lives of the two reactions equal? (Rate constant values are the same for both the reactions)
Answer» The reaction $A K - \to P r o d u c t$ , is a zero order while the reaction $B K - \to P r o d u c t$ , is a first order reaction. For what initial concentration of 'A' are the half lives of the two reactions equal? (Rate constant values are the same for both the reactions)

Discussion

16.	Enthalpy change for the process, H2O(s)⇌H2O(l) is 6.01 kJ mol−1. The entropy change for 1 mole of ice at its melting point will be
Answer» Enthalpy change for the process, $H_{2} O (s) ⇌ H_{2} O (l)$ is $6.01 k J m o l^{- 1} .$ The entropy change for 1 mole of ice at its melting point will be

Discussion

17.	The electron belongs to the angular momentum of an e−in a Bohr's orbit of H atom is 4.2178 × 10−34 Kg.m2.Sec−1.
Answer» The electron belongs to the angular momentum of an $e^{-}$ in a Bohr's orbit of H atom is $4.2178 \times 10^{- 34} K g . m^{2} . S e c^{- 1}$ .

Discussion

18.	Which of the following amines would undergo diazotisation
Answer» Which of the following amines would undergo diazotisation

Discussion

19.	Atoms of element B form HCP lattice and those of element A occupy two thirds of tetrahedral voids. The formula of the compound is .
Answer» Atoms of element B form HCP lattice and those of element A occupy two thirds of tetrahedral voids. The formula of the compound is .

Discussion

20.	Find the amount of oxygen required for the complete combustion of 4 mol of butane. 2C4H10+13O2→8CO2+10H2O
Answer» Find the amount of oxygen required for the complete combustion of 4 mol of butane. $2 C_{4} H_{10} + 13 O_{2} \to 8 C O_{2} + 10 H_{2} O$

Discussion

21.	The equilibrium2CuI⇌Cu0+CuII
Answer» The equilibrium $2 C u^{I} ⇌ C u^{0} + C u^{I I}$

Discussion

22.	The addition of 1.0 g of a compound to 10 g of water increases the boiling point by 0.3 ∘C. The amount of compound needed to prepare a 500 mL 0.1 M solution is: (Given: Assume negligible dissociation or association of the compound, boiling point constant Kb of water =0.513 K kg mol−1)
Answer» The addition of $1.0 g$ of a compound to $10 g$ of water increases the boiling point by $0.3^{\circ} C .$ The amount of compound needed to prepare a $500 mL$ $0.1 M$ solution is: (Given: Assume negligible dissociation or association of the compound, boiling point constant $K_{b}$ of water $= 0.513 {K kg mol}^{- 1}$ )

Discussion

23.	No.of alternate edges in cubic cell is 4. Explain
Answer» No.of alternate edges in cubic cell is 4. Explain

Discussion

24.	An organic compound contains 1.6% of O atom. 1 molecule of the compound contains 2 atoms of O. The molecular mass of the compound is:
Answer» An organic compound contains $1.6 %$ of $O$ atom. $1$ molecule of the compound contains $2$ atoms of $O$ . The molecular mass of the compound is:

Discussion

25.	Itis now believed that protons and neutrons (which constitute nuclei ofordinary matter) are themselves built out of more elementary unitscalled quarks. A proton and a neutron consist of three quarks each.Two types of quarks, the so called ‘up’ quark (denoted byu) of charge (+2/3) e,and the ‘down’ quark (denoted by d) of charge (−1/3)e,together with electrons build up ordinary matter. (Quarks of othertypes have also been found which give rise to different unusualvarieties of matter.) Suggest a possible quark composition of aproton and neutron.
Answer» It is now believed that protons and neutrons (which constitute nuclei of ordinary matter) are themselves built out of more elementary units called quarks. A proton and a neutron consist of three quarks each. Two types of quarks, the so called ‘up’ quark (denoted by u) of charge (+2/3) e, and the ‘down’ quark (denoted by d) of charge (−1/3) e, together with electrons build up ordinary matter. (Quarks of other types have also been found which give rise to different unusual varieties of matter.) Suggest a possible quark composition of a proton and neutron.

Discussion

26.	2HI (An elementary reaction)If the volume of the container containing the gaseous mixture is increased to two times, then final ratereaction(1) Become four times(2) Becorme th of the original rate(3) Become 2 times4) Become 2 of the original rate
Answer» 2HI (An elementary reaction)If the volume of the container containing the gaseous mixture is increased to two times, then final ratereaction(1) Become four times(2) Becorme th of the original rate(3) Become 2 times4) Become 2 of the original rate

Discussion

27.	The compound which obeys Markovnikov's rule when reacted with HBr is:
Answer» The compound which obeys Markovnikov's rule when reacted with $H B r$ is:

Discussion

28.	Calculate the enthalpy change when 50 mL of 0.01 M Ca(OH)2 reacts with 25 mL of 0.01 M HCl. Given that ΔHo of neutralization of a strong acid and a strong base is 14 kcal mol−1
Answer» Calculate the enthalpy change when $50 m L$ of $0.01 M$ $C a (O H)_{2}$ reacts with $25 m L$ of $0.01 M$ $H C l$ . Given that $Δ H^{o}$ of neutralization of a strong acid and a strong base is $14 k c a l m o l^{- 1}$

Discussion

29.	Anthracene can be electrolytically oxidised to anthraquinone.310)+ H2C14H10AnthraceneAnthraquinoneWhat mass of anthraquinone can be produced by the passageof 1 ampere current for an hour at 100% efficiency?
Answer» Anthracene can be electrolytically oxidised to anthraquinone. 310) + H2 C14H10 Anthracene Anthraquinone What mass of anthraquinone can be produced by the passage of 1 ampere current for an hour at 100% efficiency?

Discussion

30.	Solubility product of SrF2 in water is 8×10−10. Its solubility in 0.1 M NaF aqueous solution is
Answer» Solubility product of $S r F_{2}$ in water is $8 \times 10^{- 10}$ . Its solubility in 0.1 M NaF aqueous solution is

Discussion

31.	How many optically active isomers of dimethylcyclopentane are possible?
Answer» How many optically active isomers of dimethylcyclopentane are possible?

Discussion

32.	An ideal gas of adiabatic exponent γ is expanded so that the amount of heat transferred to the gas is equal to decrease in its internal energy. Then the equation of the process in terms of the variables temperature T and volume V is
Answer» An ideal gas of adiabatic exponent $γ$ is expanded so that the amount of heat transferred to the gas is equal to decrease in its internal energy. Then the equation of the process in terms of the variables temperature $T$ and volume $V$ is

Discussion

33.	Find the mole fraction of glucose in 1 molal aqueous solution of glucose.
Answer» Find the mole fraction of glucose in 1 molal aqueous solution of glucose.

Discussion

34.	When the sum of two vector is mimimum amd maximum
Answer» When the sum of two vector is mimimum amd maximum

Discussion

35.	How many numbers of electron present in NO³-?
Answer» How many numbers of electron present in NO³-?

Discussion

36.	Question 20Mineral acids are stronger acids than carboxylic acids because(i) Mineral acids are completely ionised(ii) Carboxylic acids are completely ionised(iii) Mineral acids are partially ionised(iv) Carboxylic acids are partially ionised(a) (i) and (iv)(b) (ii) and (iii)(c) (i) and (ii)(d) (iii) and (iv)
Answer» Question 20 Mineral acids are stronger acids than carboxylic acids because (i) Mineral acids are completely ionised (ii) Carboxylic acids are completely ionised (iii) Mineral acids are partially ionised (iv) Carboxylic acids are partially ionised (a) (i) and (iv) (b) (ii) and (iii) (c) (i) and (ii) (d) (iii) and (iv)

Discussion

37.	Which element has the highest number of allotropes?
Answer» Which element has the highest number of allotropes?

Discussion

38.	Q- what is anomers,epimers,enantoimers and diastereomers?
Answer» Q- what is anomers,epimers,enantoimers and diastereomers?

Discussion

39.	Between cuprous and cupric which is more stable and why
Answer» Between cuprous and cupric which is more stable and why

Discussion

40.	Among the following compounds in the options which can dehydrated very easlly:
Answer» Among the following compounds in the options which can dehydrated very easlly:

Discussion

41.	Considering the elements F,Cl,O and S, the correct order of their electron affinity values is:
Answer» Considering the elements $F, C l, O and S$ , the correct order of their electron affinity values is:

Discussion

42.	1) Using the VSEPR theory, predict the shape and draw the structure of OF2.2) Calculate the no of lone pairs on the central atom of the following:(i) ClO3‐(ii) SF4 (iii) I3‐
Answer» 1) Using the VSEPR theory, predict the shape and draw the structure of OF2. 2) Calculate the no of lone pairs on the central atom of the following: (i) ClO3‐ (ii) SF4 (iii) I3‐

Discussion

43.	When NH,OH reacts with unsymmetrical ketone then number of products formed is(1)4(2) 1 (3) 2 (4) 3
Answer» When NH,OH reacts with unsymmetrical ketone then number of products formed is(1)4(2) 1 (3) 2 (4) 3

Discussion

44.	The molar freezing point constant for water is 1.86 °C mole-1. If 342 gm of canesugar (C12H22O11) are dissolved in 1000 gm of water, the solution will freeze at
Answer» The molar freezing point constant for water is 1.86 °C mole^-1. If 342 gm of canesugar (C₁₂H₂₂O₁₁) are dissolved in 1000 gm of water, the solution will freeze at

Discussion

45.	3Energy required to dissociate 4 g of gaseousinto free gaseous atoms is 872 kJ at 25^° C. Thebond energy of H-H bond will be(1) 8.72 kJ(2) 4.36 kJ(3) 436 kJ(4) 43.6 kJ
Answer» 3Energy required to dissociate 4 g of gaseousinto free gaseous atoms is 872 kJ at 25^° C. Thebond energy of H-H bond will be(1) 8.72 kJ(2) 4.36 kJ(3) 436 kJ(4) 43.6 kJ

Discussion

46.	what amount of co2 is evolved when 50g of caco3 is strongly heated
Answer» what amount of co2 is evolved when 50g of caco3 is strongly heated

Discussion

47.	What is the purest form of carbon? a) fullerene b) carbon black c) diamond d) coke e) any other
Answer» What is the purest form of carbon? a) fullerene b) carbon black c) diamond d) coke e) any other

47.

What is the purest form of carbon? a) fullerene b) carbon black c) diamond d) coke e) any other

Answer»

What is the purest form of carbon?

a) fullerene

b) carbon black

c) diamond

d) coke

e) any other

Discussion

48.	Which of the following is not formed on hydrolysis of PCl5?
Answer» Which of the following is not formed on hydrolysis of $P C l_{5}$ ?

Discussion

49.	For an electron placed in the third orbit of the hydrogen atom, calculate the number of revolutions per second made by it around the nucleus.
Answer» For an electron placed in the third orbit of the hydrogen atom, calculate the number of revolutions per second made by it around the nucleus.

Discussion

50.	Silver crystallises in FCC lattice. If edge length of cell is 4.077×10^(-8)cm amd density is 10.5 g cm¯³. Calculate atomic mass of silver.
Answer» Silver crystallises in FCC lattice. If edge length of cell is 4.077×10^(-8)cm amd density is 10.5 g cm¯³. Calculate atomic mass of silver.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

An aqueous solution has 5% urea and 10% glucose by weight. What will be the freezing point of the solution ? (Kf of water= 1.86)

7.What is splitting term?

What is the number of unit cell in 18 grams of an element of atomic mass 27 g / mol ,if it forms fcc packing of cell edge 540 pm

How long (in seconds) a current of 3 amp has to be passed through a solution of silver nitrate to coat a metal surface of 80 cm2 with a 0.005 mm thick layer? Density of silver is 10.5 g cm−3.(Give your answer in the nearest interger value)

The molecular formula of a commercial resin used for exchanging ions in water softening is C8H7SO−3Na+ (Molecular weight=206). The maximum uptake of Ca2+ ions by the resin when expressed in mole per gram resin was found to be 1x. Find the value of x.

Why carbon cannot form more than triple bond with other carbon atom? Why only 3 is possible ?

In which of the following reactions does hydrogen act as an oxidising agent ?

Which of the following compounds will exhibit geometrical isomerism?

Are K=Ae^-E/RT and Rate=P×Zab×e^-E/RT same? Then how A=Zab×P?

At equilibrium is the concentration of reactants equal to the concentration of the product or are they constant ? What is the difference between being constant and being equal?

Which of the following metal chloride gives white ppt and black ppt respectively with aequeous solution of gas (B)

the galvanic cellAg AgCl(s), KCI(0.2M) \vert\vert KBr(0.001IM), AgBr(s)\vert AgThe anode is\lbrack Ksp (AgCI) 2.8 x 10-10. KSp (AgBr) 3.3 x 10-13

Reaction between1.formic acid and Toluene2.formic acid and methoxy benzene

The reaction AK−→Product, is a zero order while the reaction BK−→Product, is a first order reaction. For what initial concentration of 'A' are the half lives of the two reactions equal? (Rate constant values are the same for both the reactions)

Enthalpy change for the process, H2O(s)⇌H2O(l) is 6.01 kJ mol−1. The entropy change for 1 mole of ice at its melting point will be

The electron belongs to the angular momentum of an e−in a Bohr's orbit of H atom is 4.2178 × 10−34 Kg.m2.Sec−1.

Which of the following amines would undergo diazotisation

Atoms of element B form HCP lattice and those of element A occupy two thirds of tetrahedral voids. The formula of the compound is .

Find the amount of oxygen required for the complete combustion of 4 mol of butane. 2C4H10+13O2→8CO2+10H2O

The equilibrium2CuI⇌Cu0+CuII

The addition of 1.0 g of a compound to 10 g of water increases the boiling point by 0.3 ∘C. The amount of compound needed to prepare a 500 mL 0.1 M solution is: (Given: Assume negligible dissociation or association of the compound, boiling point constant Kb of water =0.513 K kg mol−1)

No.of alternate edges in cubic cell is 4. Explain

An organic compound contains 1.6% of O atom. 1 molecule of the compound contains 2 atoms of O. The molecular mass of the compound is:

2HI (An elementary reaction)If the volume of the container containing the gaseous mixture is increased to two times, then final ratereaction(1) Become four times(2) Becorme th of the original rate(3) Become 2 times4) Become 2 of the original rate

The compound which obeys Markovnikov's rule when reacted with HBr is:

Calculate the enthalpy change when 50 mL of 0.01 M Ca(OH)2 reacts with 25 mL of 0.01 M HCl. Given that ΔHo of neutralization of a strong acid and a strong base is 14 kcal mol−1

Anthracene can be electrolytically oxidised to anthraquinone.310)+ H2C14H10AnthraceneAnthraquinoneWhat mass of anthraquinone can be produced by the passageof 1 ampere current for an hour at 100% efficiency?

Solubility product of SrF2 in water is 8×10−10. Its solubility in 0.1 M NaF aqueous solution is

How many optically active isomers of dimethylcyclopentane are possible?

An ideal gas of adiabatic exponent γ is expanded so that the amount of heat transferred to the gas is equal to decrease in its internal energy. Then the equation of the process in terms of the variables temperature T and volume V is

Find the mole fraction of glucose in 1 molal aqueous solution of glucose.

When the sum of two vector is mimimum amd maximum

How many numbers of electron present in NO³-?

Which element has the highest number of allotropes?

Q- what is anomers,epimers,enantoimers and diastereomers?

Between cuprous and cupric which is more stable and why

Among the following compounds in the options which can dehydrated very easlly:

Considering the elements F,Cl,O and S, the correct order of their electron affinity values is:

1) Using the VSEPR theory, predict the shape and draw the structure of OF2.2) Calculate the no of lone pairs on the central atom of the following:(i) ClO3‐(ii) SF4 (iii) I3‐

When NH,OH reacts with unsymmetrical ketone then number of products formed is(1)4(2) 1 (3) 2 (4) 3

The molar freezing point constant for water is 1.86 °C mole-1. If 342 gm of canesugar (C12H22O11) are dissolved in 1000 gm of water, the solution will freeze at

3Energy required to dissociate 4 g of gaseousinto free gaseous atoms is 872 kJ at 25^° C. Thebond energy of H-H bond will be(1) 8.72 kJ(2) 4.36 kJ(3) 436 kJ(4) 43.6 kJ

what amount of co2 is evolved when 50g of caco3 is strongly heated

What is the purest form of carbon? a) fullerene b) carbon black c) diamond d) coke e) any other

Which of the following is not formed on hydrolysis of PCl5?

For an electron placed in the third orbit of the hydrogen atom, calculate the number of revolutions per second made by it around the nucleus.

Silver crystallises in FCC lattice. If edge length of cell is 4.077×10^(-8)cm amd density is 10.5 g cm¯³. Calculate atomic mass of silver.