10223 + Interview Questions in Chemistry Page 2 InterviewSolution

51.	The arsenic in a 1.223 gm sample of a pesticide was converted to H3ASO4, by suitable treatment. The acid was then neutralized and exactly 40 ml of 0.08 M AgNO3, was added to precipitate the arsenic quantitavely as Ag3Aso4, The excess Ag^+ in the filterate required 11.27 ml of 0.I M KSCN asAg ^++ SCN^- =AgSCN (s) Calculate the percent As2o3, in the sample.(As2O3198)
Answer» The arsenic in a 1.223 gm sample of a pesticide was converted to H3ASO4, by suitable treatment. The acid was then neutralized and exactly 40 ml of 0.08 M AgNO3, was added to precipitate the arsenic quantitavely as Ag3Aso4, The excess Ag^+ in the filterate required 11.27 ml of 0.I M KSCN asAg ^++ SCN^- =AgSCN (s) Calculate the percent As2o3, in the sample.(As2O3198)

Discussion

52.	Does any element have same atomic no. And mass no. ? If yes which then and if no then why.
Answer» Does any element have same atomic no. And mass no. ? If yes which then and if no then why.

Discussion

53.	Nodule formation
Answer» Nodule formation

Discussion

54.	What is meant by catenation. Name two ellements which exhibits this properties
Answer» What is meant by catenation. Name two ellements which exhibits this properties

Discussion

55.	why dont we use mass of nucleus(kg) but use mass number(protons+neutrons) ?
Answer» why dont we use mass of nucleus(kg) but use mass number(protons+neutrons) ?

Discussion

56.	What is difference between crystalloid and true solution as both can pass through filter paper and animal membrane?
Answer» What is difference between crystalloid and true solution as both can pass through filter paper and animal membrane?

Discussion

57.	The mass number and atomic number of an element is 23 and 11 respectively. What is the number of nucleons present in it?
Answer» The mass number and atomic number of an element is 23 and 11 respectively. What is the number of nucleons present in it?

Discussion

58.	43 The number of unpaired electrons in a paramagnetic diatomic molecule of an element with atomic number 16 is (1)2 (2)3 (3)4 (4)1
Answer» 43 The number of unpaired electrons in a paramagnetic diatomic molecule of an element with atomic number 16 is (1)2 (2)3 (3)4 (4)1

Discussion

59.	why is 'b'(co-volume) negligible in the case of gases of low pressure like CH4 and CO2 ?
Answer» why is 'b'(co-volume) negligible in the case of gases of low pressure like CH4 and CO2 ?

Discussion

60.	A solid sphere of volume V and density ρ floats at the interface of two immiscible liquids of densities ρ1 and ρ2 respectively.If ρ1
Answer» A solid sphere of volume V and density ρ floats at the interface of two immiscible liquids of densities ρ1 and ρ2 respectively.If ρ1

Discussion

61.	Question 4The chemical symbol for sodium is(a) So(b) Sd(c) NA(d) Na
Answer» Question 4 The chemical symbol for sodium is (a) So (b) Sd (c) NA (d) Na

Discussion

62.	91.A charge q of mass m is projected with speed v towards another stationary particle of some mass and charge initially at rest. The distance of closest approach of the particles is
Answer» 91.A charge q of mass m is projected with speed v towards another stationary particle of some mass and charge initially at rest. The distance of closest approach of the particles is

Discussion

63.	The solubility product of AgBr is 4.9*10^-9. The solubility of AgBr will be
Answer» The solubility product of AgBr is 4.9*10^-9. The solubility of AgBr will be

Discussion

64.	Are basicity and n- factor same?
Answer» Are basicity and n- factor same?

Discussion

65.	Why is ice at 273 Kelvin more effective in cooling than water at the same temperature?
Answer» Why is ice at 273 Kelvin more effective in cooling than water at the same temperature?

Discussion

66.	The given figure shows few data points in a photo electric effect experiment for a certain metal. The minimum energy for ejection of electrons from its surfaces :(Planck's constant h=6.62×10−34 Js)
Answer» The given figure shows few data points in a photo electric effect experiment for a certain metal. The minimum energy for ejection of electrons from its surfaces :(Planck's constant $h = 6.62 \times 10^{- 34} Js$ )

Discussion

67.	Which among the given options form an acidic oxide?
Answer» Which among the given options form an acidic oxide?

Discussion

68.	During the electrolysis of copper (II) sulphate solution using platinum as cathode and carbon as anode:(i) What do you observe at the cathode and at the anode?(ii) What change is noticed in the electrolyte?(iii) Write the reactions at the cathode and at the anode.
Answer» During the electrolysis of copper (II) sulphate solution using platinum as cathode and carbon as anode: (i) What do you observe at the cathode and at the anode? (ii) What change is noticed in the electrolyte? (iii) Write the reactions at the cathode and at the anode.

Discussion

69.	Mole fraction of solvent in aqueous solution ofNaOH having molality of 3 is2(2) 0.05(4) 0.95(3) 0.7
Answer» Mole fraction of solvent in aqueous solution ofNaOH having molality of 3 is2(2) 0.05(4) 0.95(3) 0.7

Discussion

70.	What are the cathode rays? How are these rays formed?
Answer» What are the cathode rays? How are these rays formed?

Discussion

71.	Question 11 Calculate the number of aluminium ions present in 0.051 g of aluminium oxide.
Answer» Question 11 Calculate the number of aluminium ions present in 0.051 g of aluminium oxide.

Discussion

72.	Which property of gold was considered for Rutherford's alpha-ray scattering experiment?
Answer» Which property of gold was considered for Rutherford's alpha-ray scattering experiment?

Discussion

73.	If the activation energy of a reaction is 80.9 kJ mol−1, the fraction of molecules at 700 K, having enough energy to react to form products is e−x. The value of x is_____. (Rounded off to the nearest integer)[Use R=8.31JK−1mol−1 ]
Answer» If the activation energy of a reaction is 80.9 kJ $m o l^{- 1}$ , the fraction of molecules at 700 K, having enough energy to react to form products is $e^{- x}$ . The value of x is_____. (Rounded off to the nearest integer) [Use $R = 8.31 J K^{- 1} m o l^{- 1}$ ]

73.

If the activation energy of a reaction is 80.9 kJ mol−1, the fraction of molecules at 700 K, having enough energy to react to form products is e−x. The value of x is_____. (Rounded off to the nearest integer)[Use R=8.31JK−1mol−1 ]

Answer»

If the activation energy of a reaction is 80.9 kJ $m o l^{- 1}$ , the fraction of molecules at 700 K, having enough energy to react to form products is $e^{- x}$ . The value of x is_____. (Rounded off to the nearest integer)

[Use $R = 8.31 J K^{- 1} m o l^{- 1}$ ]

Discussion

74.	A a solid ks made up of p and q. If p atoms are present at the corners of unit cell and q atoms at alternate face centre. Find the formula of solid
Answer» A a solid ks made up of p and q. If p atoms are present at the corners of unit cell and q atoms at alternate face centre. Find the formula of solid

Discussion

75.	What is a desert cooler?
Answer» What is a desert cooler?

Discussion

76.	Which of the following has smallest pKa value? (a)Ph-OH (b)Ph-CO2H (c)Ph-SO3H (d)Ph-NH2
Answer» Which of the following has smallest pKa value? (a)Ph-OH (b)Ph-CO2H (c)Ph-SO3H (d)Ph-NH2

Discussion

77.	How can we separate two immiscible liquids which have same boiling point?
Answer» How can we separate two immiscible liquids which have same boiling point?

Discussion

78.	When to consider the H+ion concentration in aqueous solution while calculatiing pH when already some value of concentration of H+ by the acid is given?Some particular concentration below which the h+ conc. of water needs to be considered?
Answer» When to consider the H+ion concentration in aqueous solution while calculatiing pH when already some value of concentration of H+ by the acid is given? Some particular concentration below which the h+ conc. of water needs to be considered?

Discussion

79.	When sugar crystals dissolve in water the level of water does not rise appreciable
Answer» When sugar crystals dissolve in water the level of water does not rise appreciable

Discussion

80.	Colloid
Answer» Colloid

Discussion

81.	Which of the following is not true for cathode rays?
Answer» Which of the following is not true for cathode rays?

Discussion

82.	The formula of DDT is
Answer» The formula of DDT is

Discussion

83.	Which of the following aqueous solution has the highest freezing point?
Answer» Which of the following aqueous solution has the highest freezing point?

Discussion

84.	What would be the chemical formula for aluminium oxide
Answer» What would be the chemical formula for aluminium oxide

Discussion

85.	The colour of copper sulphate solution is
Answer» The colour of copper sulphate solution is

Discussion

86.	16.C_{(s)}+ H_2O_{(g)}➡ CO_{(g)} +{H_2}_{(g)}; H
Answer» 16.C_{(s)}+ H_2O_{(g)}➡ CO_{(g)} +{H_2}_{(g)}; H <0 The above equilibrium will proceed in forward direction when (1) It is subjected to high pressure (2) It is subjected to high temperature (3) Inert gas (Argon) is added at constant pressure (4) Carbon (solid) is added

Discussion

87.	Which of the following does not lose an electron easily 1)Na 2)F 3)Mg 4)Al
Answer» Which of the following does not lose an electron easily 1)Na 2)F 3)Mg 4)Al

Discussion

88.	Explain discovery of electron and proton
Answer» Explain discovery of electron and proton

Discussion

89.	What is the chemical reaction involved in carbon dioxide based fire extinguisher?
Answer» What is the chemical reaction involved in carbon dioxide based fire extinguisher?

Discussion

90.	NaCl consists of two kinds of particles still it is considered pure substance. Justify
Answer» NaCl consists of two kinds of particles still it is considered pure substance. Justify

Discussion

91.	calculate the amount of heat required to raise the temp. of 13.5 grams of aluminum from 300K to 400K using the formula [ S= qM/mΔt] specific heat capacity of Al is 0.45 J/g
Answer» calculate the amount of heat required to raise the temp. of 13.5 grams of aluminum from 300K to 400K using the formula [ S= qM/mΔt] specific heat capacity of Al is 0.45 J/g

Discussion

92.	Write the three uses of decomposition reaction in industries?
Answer» Write the three uses of decomposition reaction in industries?

Discussion

93.	The magnetic moments of Cr (Z=24), Mn (Z=25) and Fe (Z=26) are x, y and z respectively. Hence,
Answer» The magnetic moments of $C r$ ( $Z = 24$ ), $M n$ ( $Z = 25$ ) and $F e$ ( $Z = 26$ ) are $x, y$ and $z$ respectively. Hence,

Discussion

94.	The valency of chloride ion is___ .
Answer» The valency of chloride ion is___ .

Discussion

95.	why the charge of electron proton is very exact sam
Answer» why the charge of electron proton is very exact sam

Discussion

96.	On the combustion of glucose heat of combustion is -2880 kJ / molal . If 18 gm glucose is used then the amount of heat evolved is
Answer» On the combustion of glucose heat of combustion is -2880 kJ / molal . If 18 gm glucose is used then the amount of heat evolved is

Discussion

97.	Name a compound made with one element as a noble gas.
Answer» Name a compound made with one element as a noble gas.

Discussion

98.	Volume of CO2 obtained at STP by the thermal decompostion of 50 g CaCO3 is(CaCO3 -> CaO + CO2)1- 22.4 L2- 2.24 L3- 5.6 L4- 11.2 L
Answer» Volume of CO2 obtained at STP by the thermal decompostion of 50 g CaCO3 is (CaCO3 -> CaO + CO2) 1- 22.4 L 2- 2.24 L 3- 5.6 L 4- 11.2 L

Discussion

99.	(a) Name the process used for the manufacture of nitric acid.(b) What are the reactants required for it and what are their sources?(c) In which ratio reactants are taken in this process?(d) Name the catalyst used in the process.(e) What is the oxidizing agent in this process?(f) Write the equations involved.
Answer» (a) Name the process used for the manufacture of nitric acid. (b) What are the reactants required for it and what are their sources? (c) In which ratio reactants are taken in this process? (d) Name the catalyst used in the process. (e) What is the oxidizing agent in this process? (f) Write the equations involved.

Discussion

100.	Complete combustion of carbon leads to the formation of _________.
Answer» Complete combustion of carbon leads to the formation of _________.

Discussion

Explore topic-wise InterviewSolutions in .

Does any element have same atomic no. And mass no. ? If yes which then and if no then why.

Nodule formation

What is meant by catenation. Name two ellements which exhibits this properties

why dont we use mass of nucleus(kg) but use mass number(protons+neutrons) ?

What is difference between crystalloid and true solution as both can pass through filter paper and animal membrane?

The mass number and atomic number of an element is 23 and 11 respectively. What is the number of nucleons present in it?

43 The number of unpaired electrons in a paramagnetic diatomic molecule of an element with atomic number 16 is (1)2 (2)3 (3)4 (4)1

why is 'b'(co-volume) negligible in the case of gases of low pressure like CH4 and CO2 ?

A solid sphere of volume V and density ρ floats at the interface of two immiscible liquids of densities ρ1 and ρ2 respectively.If ρ1

Question 4The chemical symbol for sodium is(a) So(b) Sd(c) NA(d) Na

91.A charge q of mass m is projected with speed v towards another stationary particle of some mass and charge initially at rest. The distance of closest approach of the particles is

The solubility product of AgBr is 4.9*10^-9. The solubility of AgBr will be

Are basicity and n- factor same?

Why is ice at 273 Kelvin more effective in cooling than water at the same temperature?

The given figure shows few data points in a photo electric effect experiment for a certain metal. The minimum energy for ejection of electrons from its surfaces :(Planck's constant h=6.62×10−34 Js)

Which among the given options form an acidic oxide?

During the electrolysis of copper (II) sulphate solution using platinum as cathode and carbon as anode:(i) What do you observe at the cathode and at the anode?(ii) What change is noticed in the electrolyte?(iii) Write the reactions at the cathode and at the anode.

Mole fraction of solvent in aqueous solution ofNaOH having molality of 3 is2(2) 0.05(4) 0.95(3) 0.7

What are the cathode rays? How are these rays formed?

Question 11 Calculate the number of aluminium ions present in 0.051 g of aluminium oxide.

Which property of gold was considered for Rutherford's alpha-ray scattering experiment?

If the activation energy of a reaction is 80.9 kJ mol−1, the fraction of molecules at 700 K, having enough energy to react to form products is e−x. The value of x is_____. (Rounded off to the nearest integer)[Use R=8.31JK−1mol−1 ]

A a solid ks made up of p and q. If p atoms are present at the corners of unit cell and q atoms at alternate face centre. Find the formula of solid

What is a desert cooler?

Which of the following has smallest pKa value? (a)Ph-OH (b)Ph-CO2H (c)Ph-SO3H (d)Ph-NH2

How can we separate two immiscible liquids which have same boiling point?

When to consider the H+ion concentration in aqueous solution while calculatiing pH when already some value of concentration of H+ by the acid is given?Some particular concentration below which the h+ conc. of water needs to be considered?

When sugar crystals dissolve in water the level of water does not rise appreciable

Colloid

Which of the following is not true for cathode rays?

The formula of DDT is

Which of the following aqueous solution has the highest freezing point?

What would be the chemical formula for aluminium oxide

The colour of copper sulphate solution is

16.C_{(s)}+ H_2O_{(g)}➡ CO_{(g)} +{H_2}_{(g)}; H

Which of the following does not lose an electron easily 1)Na 2)F 3)Mg 4)Al

Explain discovery of electron and proton

What is the chemical reaction involved in carbon dioxide based fire extinguisher?

NaCl consists of two kinds of particles still it is considered pure substance. Justify

calculate the amount of heat required to raise the temp. of 13.5 grams of aluminum from 300K to 400K using the formula [ S= qM/mΔt] specific heat capacity of Al is 0.45 J/g

Write the three uses of decomposition reaction in industries?

The magnetic moments of Cr (Z=24), Mn (Z=25) and Fe (Z=26) are x, y and z respectively. Hence,

The valency of chloride ion is___ .

why the charge of electron proton is very exact sam

On the combustion of glucose heat of combustion is -2880 kJ / molal . If 18 gm glucose is used then the amount of heat evolved is

Name a compound made with one element as a noble gas.

Volume of CO2 obtained at STP by the thermal decompostion of 50 g CaCO3 is(CaCO3 -> CaO + CO2)1- 22.4 L2- 2.24 L3- 5.6 L4- 11.2 L

Complete combustion of carbon leads to the formation of _________.