10223 + Interview Questions in Chemistry Page 118 InterviewSolution

5851.	A bottle of perfume was opened in a room . The smell of its vapours spread in the entire room. Name the property of gases which responsible for this behaviour of perfume vapours.
Answer» A bottle of perfume was opened in a room . The smell of its vapours spread in the entire room. Name the property of gases which responsible for this behaviour of perfume vapours.

Discussion

5852.	su19. The pH of 0.15 M solution of HOCIНOC!9.6 x 10-) is : -(K=(1) 4.42(4) None(2) 2.92(3) 3.42
Answer» su19. The pH of 0.15 M solution of HOCIНOC!9.6 x 10-) is : -(K=(1) 4.42(4) None(2) 2.92(3) 3.42

Discussion

5853.	Convert the following temperature to the Celsius scale.(a) 293 K (b) 470 K
Answer» Convert the following temperature to the Celsius scale. (a) 293 K (b) 470 K

5853.

Convert the following temperature to the Celsius scale.(a) 293 K (b) 470 K

Answer»

Convert the following temperature to the Celsius scale.

(a) 293 K (b) 470 K

Discussion

5854.	Sort the following according to their physical and chemical changes.(i) Combustion of wood(ii) Melting of ice.(iii) Cooking of food.(iv) Rusting of iron.(v) Ripening of fruits.(vi) Tearing of papers.
Answer» Sort the following according to their physical and chemical changes. (i) Combustion of wood (ii) Melting of ice. (iii) Cooking of food. (iv) Rusting of iron. (v) Ripening of fruits. (vi) Tearing of papers.

5854.

Sort the following according to their physical and chemical changes.(i) Combustion of wood(ii) Melting of ice.(iii) Cooking of food.(iv) Rusting of iron.(v) Ripening of fruits.(vi) Tearing of papers.

Answer»

Sort the following according to their physical and chemical changes.

(i) Combustion of wood

(ii) Melting of ice.

(iii) Cooking of food.

(iv) Rusting of iron.

(v) Ripening of fruits.

(vi) Tearing of papers.

Discussion

5855.	Pressure of an ideal gas decreases to 5% at 5^° Cof its original value of 5 atm at 283^° C. What is thepercentage change in its density?
Answer» Pressure of an ideal gas decreases to 5% at 5^° Cof its original value of 5 atm at 283^° C. What is thepercentage change in its density?

Discussion

5856.	(c) 0.009%7. Two flasks of equal volume. are connected by anarrow tube (of negligible volume) all at 27^° C andcontain 0.70 mole of Ho at 0.5 atm. One of the flaskis then immersed into a bath kept at 127^° C, whilethe other remains at 27^° C. The final pressure ineach flask is(a) 0.5714 atm(b) 1.5714 atm(c) 0.5824 atm(d) none of the above
Answer» (c) 0.009%7. Two flasks of equal volume. are connected by anarrow tube (of negligible volume) all at 27^° C andcontain 0.70 mole of Ho at 0.5 atm. One of the flaskis then immersed into a bath kept at 127^° C, whilethe other remains at 27^° C. The final pressure ineach flask is(a) 0.5714 atm(b) 1.5714 atm(c) 0.5824 atm(d) none of the above

Discussion

5857.	11. Derive the formula of nCr=n! /(r! (n-r)!)
Answer» 11. Derive the formula of nCr=n! /(r! (n-r)!)

Discussion

5858.	Match the atomic number 4, 8, 14, 15 and 19 with each of the following: (a) A solid non-metal of valency 3. (b) A gas of valency 2. (c) A metal of valency 1. (d) A non-metal of valency 4.
Answer» Match the atomic number 4, 8, 14, 15 and 19 with each of the following: (a) A solid non-metal of valency 3. (b) A gas of valency 2. (c) A metal of valency 1. (d) A non-metal of valency 4.

5858.

Match the atomic number 4, 8, 14, 15 and 19 with each of the following: (a) A solid non-metal of valency 3. (b) A gas of valency 2. (c) A metal of valency 1. (d) A non-metal of valency 4.

Answer»

Match the atomic number 4, 8, 14, 15 and 19 with each of the following:

(a) A solid non-metal of valency 3.

(b) A gas of valency 2.

(c) A metal of valency 1.

(d) A non-metal of valency 4.

Discussion

5859.	What do mean by undirectional nature of ionic bond
Answer» What do mean by undirectional nature of ionic bond

Discussion

5860.	In a test, Rashi has to write the chemical equation for the formation of hydrochloric acid. She wrote H2+2Cl→2 HCl The teacher marked the answer wrong. Why is it so?
Answer» In a test, Rashi has to write the chemical equation for the formation of hydrochloric acid. She wrote $H_{2} + 2 C l \to 2 H C l$ The teacher marked the answer wrong. Why is it so?

Discussion

5861.	What is the valency of : (a) fluorine in CaF2 (b) sulphur in SF6 (c) phosphorus in PH3 (d) carbon in CH4
Answer» What is the valency of : (a) fluorine in $C a F_{2}$ (b) sulphur in $S F_{6}$ (c) phosphorus in $P H_{3}$ (d) carbon in $C H_{4}$

5861.

What is the valency of : (a) fluorine in CaF2 (b) sulphur in SF6 (c) phosphorus in PH3 (d) carbon in CH4

Answer»

What is the valency of :

(a) fluorine in $C a F_{2}$ (b) sulphur in $S F_{6}$

(c) phosphorus in $P H_{3}$ (d) carbon in $C H_{4}$

Discussion

5862.	Is water an element or a compound? Give reason to support your statement.
Answer» Is water an element or a compound? Give reason to support your statement.

Discussion

5863.	The mass number of an atom is determined by the number of protons and neutrons. Calculate the mass number of a Sodium (Na) atom if the number of neutrons in it are 12.
Answer» The mass number of an atom is determined by the number of protons and neutrons. Calculate the mass number of a Sodium (Na) atom if the number of neutrons in it are 12.

Discussion

5864.	What are homogeneous and heterogeneous mixtures?
Answer» What are homogeneous and heterogeneous mixtures?

Discussion

5865.	27. Out of diamond, graphite,fullerene,and borazine which of them are aromatic.
Answer» 27. Out of diamond, graphite,fullerene,and borazine which of them are aromatic.

Discussion

5866.	What is ethanol ionisation
Answer» What is ethanol ionisation

Discussion

5867.	A vessel contains a non-linear triatomic gas.If 50% of gas dissociate into individual atom then find new value of degree of freedom by ignoring the vibrational mode andany further dissociation. a)2.15 b)3.75 c)5.25 d)6.3
Answer» A vessel contains a non-linear triatomic gas.If 50% of gas dissociate into individual atom then find new value of degree of freedom by ignoring the vibrational mode andany further dissociation. a)2.15 b)3.75 c)5.25 d)6.3

Discussion

5868.	The absolute zero is the temperature at which:
Answer» The absolute zero is the temperature at which:

Discussion

5869.	Charatistics of nature of particles of a matter?
Answer» Charatistics of nature of particles of a matter?

Discussion

5870.	The correct order of the tendency of metals in the activity series to lose valence electron is:
Answer» The correct order of the tendency of metals in the activity series to lose valence electron is:

Discussion

5871.	A compound formed by the elements X, Y crystlallizes in a cubic structure . Atoms of element X occupy all the corners and half the face centres of the cube. Atoms of element Y are present at the remaining face centres and body centre. The simplest formula for the compound is:
Answer» A compound formed by the elements X, Y crystlallizes in a cubic structure . Atoms of element X occupy all the corners and half the face centres of the cube. Atoms of element Y are present at the remaining face centres and body centre. The simplest formula for the compound is:

Discussion

5872.	The approximate size of the nucleus can be calculated by using energy conservation theorem in Rutherford's a-scattering experiment ie. (Total energy) initial =(Total energy) final. In 1st experiment radius of a particular nucleus is calculated by the projection of aalpha particle from Infinity at a speed v m/s. Let this radius be the true radius. In 2nd experiment, the radius calculation for same nuclei is made by projecting the alpha particle with five sixth of the earlier speed. The percentage error involved in the calculation of radius of nucleus in the 2nd experiment is
Answer» The approximate size of the nucleus can be calculated by using energy conservation theorem in Rutherford's a-scattering experiment ie. (Total energy) initial =(Total energy) final. In 1st experiment radius of a particular nucleus is calculated by the projection of aalpha particle from Infinity at a speed v m/s. Let this radius be the true radius. In 2nd experiment, the radius calculation for same nuclei is made by projecting the alpha particle with five sixth of the earlier speed. The percentage error involved in the calculation of radius of nucleus in the 2nd experiment is

Discussion

5873.	54. In the lithium atom screening effect of valence shell electron is caused by - 1) Electron of k and L shell 2) Electron of k shell 3) Two electron of 1st and one of 2nd shell 4) None
Answer» 54. In the lithium atom screening effect of valence shell electron is caused by - 1) Electron of k and L shell 2) Electron of k shell 3) Two electron of 1st and one of 2nd shell 4) None

Discussion

5874.	Name one common substance which can be easily changed from one state to another by heating or cooling.
Answer» Name one common substance which can be easily changed from one state to another by heating or cooling.

Discussion

5875.	List two observations which posed a challenge to Mendeleev’s Periodic Law.
Answer» List two observations which posed a challenge to Mendeleev’s Periodic Law.

Discussion

5876.	How much should the pressure be increased inorder to decrease the volume of a gas by 5% ata constant temperature?
Answer» How much should the pressure be increased inorder to decrease the volume of a gas by 5% ata constant temperature?

Discussion

5877.	Which of the following is correct?(A) K (weak acid). K (conjugate weak base)= Kw (B) K (strong acid). K(conjugate weak base)= Kw (C) K( weak acid). K(weak base)=Kw (D) K (weak acid). K (conjugate strong base) =kw
Answer» Which of the following is correct?(A) K (weak acid). K (conjugate weak base)= Kw (B) K (strong acid). K(conjugate weak base)= Kw (C) K( weak acid). K(weak base)=Kw (D) K (weak acid). K (conjugate strong base) =kw

Discussion

5878.	0.16 g of dibasic acid required 25 ml of decinormal NaOH solution for complete neutralisation. The molecular weight of the acid will be
Answer» 0.16 g of dibasic acid required 25 ml of decinormal NaOH solution for complete neutralisation. The molecular weight of the acid will be

Discussion

5879.	Which of the component in a fire triangle is the toughest to remove in case of fire?
Answer» Which of the component in a fire triangle is the toughest to remove in case of fire?

Discussion

5880.	Two elements X (atomic mass =75)and Y (Atomic mass =16) combine to give a compound having 75.8% of X . The empirical ormula of compound is A)XY B)X2Y C)X2Y2 D)X2Y3
Answer» Two elements X (atomic mass =75)and Y (Atomic mass =16) combine to give a compound having 75.8% of X . The empirical ormula of compound is A)XY B)X2Y C)X2Y2 D)X2Y3

Discussion

5881.

Match the transformations in Column-I with appropriate options in Column-II. Column I Column II (A) CO2(s)→CO2(g) (p) Phase transition (B) CaCO3(s)→CaO(s)+CO2(g) (q) Allotropic change (C) 2H→H2(g) (r) ΔH is positive (D) Pwhite, solid→Pred, solid (s) ΔS is positive (t) ΔS is negative

Answer» Match the transformations in Column-I with appropriate options in Column-II.

	Column I		Column II
(A)	$C O_{2} (s) \to C O_{2} (g)$	(p)	Phase transition
(B)	$C a C O_{3} (s) \to C a O (s) + C O_{2} (g)$	(q)	Allotropic change
(C)	$2 H \to H_{2} (g)$	(r)	$Δ H$ is positive
(D)	$P_{white, solid} \to P_{red, solid}$	(s)	$Δ S$ is positive
		(t)	$Δ S$ is negative

Discussion

5882.	Give the formulae fo the compound that would be formed by the ombinatiion of the ollowing pairs of elements: (a) Mg and N2 (b) Li and O2 (c) Al and Cl2 (d) K and H
Answer» Give the formulae fo the compound that would be formed by the ombinatiion of the ollowing pairs of elements: (a) $M g a n d N_{2}$ (b) $L i a n d O_{2}$ (c) $A l a n d C l_{2}$ (d) $K a n d H$

Discussion

5883.	The nitrogen exists as two nitrogen atoms joined by
Answer» The nitrogen exists as two nitrogen atoms joined by

Discussion

5884.	How can the reactivity of an element be explained
Answer» How can the reactivity of an element be explained

Discussion

5885.	The compound containing co-ordinate bond is
Answer» The compound containing co-ordinate bond is

Discussion

5886.	Hardness of water is estimated by simple titration with which compound?
Answer» Hardness of water is estimated by simple titration with which compound?

Discussion

5887.	Mole fraction of the solute in a 1.00 molal aqueous solution is
Answer» Mole fraction of the solute in a 1.00 molal aqueous solution is

Discussion

5888.	Question 42Calculate the mass of sodium sulphate required to prepare its 20% (mass percent) solution in 100 g of water?
Answer» Question 42 Calculate the mass of sodium sulphate required to prepare its 20% (mass percent) solution in 100 g of water?

Discussion

5889.	12. The number of auditor plateau positive integer which are the solution of X + Y + Z =100
Answer» 12. The number of auditor plateau positive integer which are the solution of X + Y + Z =100

Discussion

5890.	From the formula of CO2, we can frame the valencies of carbon and oxygen. But, the valencies of Carbon and oxygen will differ when in Carbon - Monoxide(CO). What is the reason ?
Answer» From the formula of CO2, we can frame the valencies of carbon and oxygen. But, the valencies of Carbon and oxygen will differ when in Carbon - Monoxide(CO). What is the reason ?

Discussion

5891.	What is Bravias lattice for Triclinic unit crystal system?
Answer» What is Bravias lattice for Triclinic unit crystal system?

Discussion

5892.	x moles of an organic non-volatile monobasic acid were taken and dissolved in water. The change in boiling point △Tb. pH of the solution will be
Answer» x moles of an organic non-volatile monobasic acid were taken and dissolved in water. The change in boiling point $△ T_{b}$ . pH of the solution will be

Discussion

5893.	why valence shell has maximum 8 electrons
Answer» why valence shell has maximum 8 electrons

Discussion

5894.	Approximate atomic weight of an element is 26.89. If its equivalent weight is 8.9, the exact atomic weight of element would be :-
Answer» Approximate atomic weight of an element is 26.89. If its equivalent weight is 8.9, the exact atomic weight of element would be :-

Discussion

5895.	A compound containing Ca, C, N and S was subjected to quantitative analysis and formula mass determination.A 0.25 g of this compound was mixed with Na_2CO_3, to convert all Ca into 0.16 g CaCO3A 0.115 g sample of compound was carried through a series of reactions until all its S was changed into SO_4^{2-}, and precipitated as 0.344 g of BasO4.A 0.712 g sample was processed to liberate all of its N asNH3 and 0.155 g NHwas obtained. The formula mass was found to be 156. Determine the empiricaland molecular formula of the compound:
Answer» A compound containing Ca, C, N and S was subjected to quantitative analysis and formula mass determination.A 0.25 g of this compound was mixed with Na_2CO_3, to convert all Ca into 0.16 g CaCO3A 0.115 g sample of compound was carried through a series of reactions until all its S was changed into SO_4^{2-}, and precipitated as 0.344 g of BasO4.A 0.712 g sample was processed to liberate all of its N asNH3 and 0.155 g NHwas obtained. The formula mass was found to be 156. Determine the empiricaland molecular formula of the compound:

Discussion

5896.	An atom has complete K and L shell. Is it an atom of a metal, non metal, novel gas? Justify
Answer» An atom has complete K and L shell. Is it an atom of a metal, non metal, novel gas? Justify

Discussion

5897.	a. What do you understand by oxidation?b. How does carbon reacts with oxygen?
Answer» a. What do you understand by oxidation? b. How does carbon reacts with oxygen?

5897.

a. What do you understand by oxidation?b. How does carbon reacts with oxygen?

Answer»

a. What do you understand by oxidation?

b. How does carbon reacts with oxygen?

Discussion

5898.	Is the positive terminal of a battery known as cathode and are anode rays positively charged?
Answer» Is the positive terminal of a battery known as cathode and are anode rays positively charged?

Discussion

5899.	The solid state of CO2 is called :-
Answer» The solid state of CO₂ is called :-

Discussion

5900.	What is the change in pH, when the solution of base is diluted with water?
Answer» What is the change in pH, when the solution of base is diluted with water?

Discussion

Explore topic-wise InterviewSolutions in .

A bottle of perfume was opened in a room . The smell of its vapours spread in the entire room. Name the property of gases which responsible for this behaviour of perfume vapours.

su19. The pH of 0.15 M solution of HOCIНOC!9.6 x 10-) is : -(K=(1) 4.42(4) None(2) 2.92(3) 3.42

Convert the following temperature to the Celsius scale.(a) 293 K (b) 470 K

Sort the following according to their physical and chemical changes.(i) Combustion of wood(ii) Melting of ice.(iii) Cooking of food.(iv) Rusting of iron.(v) Ripening of fruits.(vi) Tearing of papers.

Pressure of an ideal gas decreases to 5% at 5^° Cof its original value of 5 atm at 283^° C. What is thepercentage change in its density?

11. Derive the formula of nCr=n! /(r! (n-r)!)

Match the atomic number 4, 8, 14, 15 and 19 with each of the following: (a) A solid non-metal of valency 3. (b) A gas of valency 2. (c) A metal of valency 1. (d) A non-metal of valency 4.

What do mean by undirectional nature of ionic bond

In a test, Rashi has to write the chemical equation for the formation of hydrochloric acid. She wrote H2+2Cl→2 HCl The teacher marked the answer wrong. Why is it so?

What is the valency of : (a) fluorine in CaF2 (b) sulphur in SF6 (c) phosphorus in PH3 (d) carbon in CH4

Is water an element or a compound? Give reason to support your statement.

The mass number of an atom is determined by the number of protons and neutrons. Calculate the mass number of a Sodium (Na) atom if the number of neutrons in it are 12.

What are homogeneous and heterogeneous mixtures?

27. Out of diamond, graphite,fullerene,and borazine which of them are aromatic.

What is ethanol ionisation

A vessel contains a non-linear triatomic gas.If 50% of gas dissociate into individual atom then find new value of degree of freedom by ignoring the vibrational mode andany further dissociation. a)2.15 b)3.75 c)5.25 d)6.3

The absolute zero is the temperature at which:

Charatistics of nature of particles of a matter?

The correct order of the tendency of metals in the activity series to lose valence electron is:

A compound formed by the elements X, Y crystlallizes in a cubic structure . Atoms of element X occupy all the corners and half the face centres of the cube. Atoms of element Y are present at the remaining face centres and body centre. The simplest formula for the compound is:

54. In the lithium atom screening effect of valence shell electron is caused by - 1) Electron of k and L shell 2) Electron of k shell 3) Two electron of 1st and one of 2nd shell 4) None

Name one common substance which can be easily changed from one state to another by heating or cooling.

List two observations which posed a challenge to Mendeleev’s Periodic Law.

How much should the pressure be increased inorder to decrease the volume of a gas by 5% ata constant temperature?

Which of the following is correct?(A) K (weak acid). K (conjugate weak base)= Kw (B) K (strong acid). K(conjugate weak base)= Kw (C) K( weak acid). K(weak base)=Kw (D) K (weak acid). K (conjugate strong base) =kw

0.16 g of dibasic acid required 25 ml of decinormal NaOH solution for complete neutralisation. The molecular weight of the acid will be

Which of the component in a fire triangle is the toughest to remove in case of fire?

Two elements X (atomic mass =75)and Y (Atomic mass =16) combine to give a compound having 75.8% of X . The empirical ormula of compound is A)XY B)X2Y C)X2Y2 D)X2Y3

Match the transformations in Column-I with appropriate options in Column-II. Column I Column II (A) CO2(s)→CO2(g) (p) Phase transition (B) CaCO3(s)→CaO(s)+CO2(g) (q) Allotropic change (C) 2H→H2(g) (r) ΔH is positive (D) Pwhite, solid→Pred, solid (s) ΔS is positive (t) ΔS is negative

Give the formulae fo the compound that would be formed by the ombinatiion of the ollowing pairs of elements: (a) Mg and N2 (b) Li and O2 (c) Al and Cl2 (d) K and H

The nitrogen exists as two nitrogen atoms joined by

How can the reactivity of an element be explained

The compound containing co-ordinate bond is

Hardness of water is estimated by simple titration with which compound?

Mole fraction of the solute in a 1.00 molal aqueous solution is

Question 42Calculate the mass of sodium sulphate required to prepare its 20% (mass percent) solution in 100 g of water?

12. The number of auditor plateau positive integer which are the solution of X + Y + Z =100

From the formula of CO2, we can frame the valencies of carbon and oxygen. But, the valencies of Carbon and oxygen will differ when in Carbon - Monoxide(CO). What is the reason ?

What is Bravias lattice for Triclinic unit crystal system?

x moles of an organic non-volatile monobasic acid were taken and dissolved in water. The change in boiling point △Tb. pH of the solution will be

why valence shell has maximum 8 electrons

Approximate atomic weight of an element is 26.89. If its equivalent weight is 8.9, the exact atomic weight of element would be :-

An atom has complete K and L shell. Is it an atom of a metal, non metal, novel gas? Justify

a. What do you understand by oxidation?b. How does carbon reacts with oxygen?

Is the positive terminal of a battery known as cathode and are anode rays positively charged?

The solid state of CO2 is called :-

What is the change in pH, when the solution of base is diluted with water?