10223 + Interview Questions in Chemistry Page 21 InterviewSolution

1001.	Question 10. The process of digestion is a chemical change. Justify. Give an example of a physical change that occurs by the action of heat. (3) Name the metal which is used for galvanizing iron.
Answer» Question 10. The process of digestion is a chemical change. Justify. Give an example of a physical change that occurs by the action of heat. (3) Name the metal which is used for galvanizing iron.

1001.

Question 10. The process of digestion is a chemical change. Justify. Give an example of a physical change that occurs by the action of heat. (3) Name the metal which is used for galvanizing iron.

Answer»

Question 10.

The process of digestion is a chemical change. Justify.

Give an example of a physical change that occurs by the action of heat.

(3) Name the metal which is used for galvanizing iron.

1002.	what is the relationship between molality and mole fraction?
Answer» what is the relationship between molality and mole fraction?

Discussion

1003.	Define water cycle. Rearrange the steps of a water cycle to get the correct sequence. [3 MARKS] i. Water evaporates from the water reservoirs present on land. ii. Water exists in the form of water vapours in the atmosphere. iii. Condensation of the water droplets converts them into clouds. iv. Rainwater again flows into different forms of water reservoirs on land. v. When the clouds become big and heavy they fall down as rain. vi. Water vapours, due to cooling, form droplets using dust particles as nuclei.
Answer» Define water cycle. Rearrange the steps of a water cycle to get the correct sequence. [3 MARKS] i. Water evaporates from the water reservoirs present on land. ii. Water exists in the form of water vapours in the atmosphere. iii. Condensation of the water droplets converts them into clouds. iv. Rainwater again flows into different forms of water reservoirs on land. v. When the clouds become big and heavy they fall down as rain. vi. Water vapours, due to cooling, form droplets using dust particles as nuclei.

Discussion

1004.	31. Explain the tautomerism in acetylacetone.
Answer» 31. Explain the tautomerism in acetylacetone.

Discussion

1005.	What do you understand by dissolution? Does dissolution lead to the formation of a new substance?
Answer» What do you understand by dissolution? Does dissolution lead to the formation of a new substance?

Discussion

1006.	Gas laws establish relationship between:
Answer» Gas laws establish relationship between:

Discussion

1007.	The formula for a compound is given as C3H8. This is a/an
Answer» The formula for a compound is given as $C_{3}$ $H_{8}$ . This is a/an

Discussion

1008.	If positive charge attracts negative charge then why don't the electrons move towards the nucleus.
Answer» If positive charge attracts negative charge then why don't the electrons move towards the nucleus.

Discussion

1009.	Assertion: The mass of Chlorine is 35.5 u Reason: For elements having isotopes, the average of mass of its isotopes is considered as the atomic mass of that element.
Answer» Assertion: The mass of Chlorine is 35.5 u Reason: For elements having isotopes, the average of mass of its isotopes is considered as the atomic mass of that element.

1009.

Assertion: The mass of Chlorine is 35.5 u Reason: For elements having isotopes, the average of mass of its isotopes is considered as the atomic mass of that element.

Answer»

Assertion: The mass of Chlorine is 35.5 u

Reason: For elements having isotopes, the average of mass of its isotopes is considered as the atomic mass of that element.

Discussion

1010.	What are homo atomic and hetro atomic elements
Answer» What are homo atomic and hetro atomic elements

Discussion

1011.	What differences in the properties of oil and water enable their separation by a separating funnel ?
Answer» What differences in the properties of oil and water enable their separation by a separating funnel ?

Discussion

1012.	Q1 basicity of oxalic acid explain
Answer» Q1 basicity of oxalic acid explain

Discussion

1013.	What are quark particles and why are they not used as elementary unit
Answer» What are quark particles and why are they not used as elementary unit

Discussion

1014.	Question 10 (l) Classify the following into elements, compounds and mixtures. l. Carbon dioxide
Answer» Question 10 (l) Classify the following into elements, compounds and mixtures. l. Carbon dioxide

Discussion

1015.	For a reservoir having 100 ha surface area, the saturation vapour at 300C is 35 mm of Hg and actual vapour pressure at 9 m is found out to be 50% of the saturation vapour pressure. If wind velocity at 2 m above the ground is 12 kmph then average daily evaporation from lake reservoir will be _________mm/d.[Use Meyer's formula and take km=0.36]12.16
Answer» For a reservoir having 100 ha surface area, the saturation vapour at 30 $^{0}$ C is 35 mm of Hg and actual vapour pressure at 9 m is found out to be 50% of the saturation vapour pressure. If wind velocity at 2 m above the ground is 12 kmph then average daily evaporation from lake reservoir will be _________mm/d. [Use Meyer's formula and take $k_{m} = 0.36$ ] 12.16

Discussion

1016.	Hydrogen peroxide reacts with iodine in basic medium to give:
Answer» Hydrogen peroxide reacts with iodine in basic medium to give:

Discussion

1017.	Which of the following forms the bottom layer in the filtration tank in the purification and supply of drinking water in a city?
Answer» Which of the following forms the bottom layer in the filtration tank in the purification and supply of drinking water in a city?

Discussion

1018.

A solution of hydrogen chloride in water is prepared. The following substances are added to separate portions of the solution: S. No. Substance added Gas evolved Odour 1. 2. 3. 4. calcium carbonate magnesium ribbon manganese (IV) oxide with heating sodium sulphide Complete the table by writing the gas evolved in each case and its odour.

Answer» A solution of hydrogen chloride in water is prepared. The following substances are added to separate portions of the solution:

S. No.	Substance added	Gas evolved	Odour
1. 2. 3. 4.	calcium carbonate magnesium ribbon manganese (IV) oxide with heating sodium sulphide	__ __ __ __	__ __ __ __

Complete the table by writing the gas evolved in each case and its odour.

Discussion

1019.	what is antipositron and positron?
Answer» what is antipositron and positron?

Discussion

1020.	Who am I ?(a) I’m found in a thermometer, I measure your temperature.(b) I make things hot or cold.(c) I have no shape whatsoever !(d) I dissolve in water, but not in kerosene.
Answer» Who am I ? (a) I’m found in a thermometer, I measure your temperature. (b) I make things hot or cold. (c) I have no shape whatsoever ! (d) I dissolve in water, but not in kerosene.

Discussion

1021.	Explain the formation of ozone in the atmosphere.
Answer» Explain the formation of ozone in the atmosphere.

Discussion

1022.	Write sequential observation for effect of heat on(a) copper nitrate(b) lead carbonate(c) ammonium chloride.
Answer» Write sequential observation for effect of heat on (a) copper nitrate (b) lead carbonate (c) ammonium chloride.

Discussion

1023.	distance between the centres of carbonTheand oxygen atoms in the carbon monoxide0as molecule is 1.13 x 10-10m. The distanceof centre of mass of the molecule relative tocarbon atom is1) 0.48 x 10-10m2) 0.64 x 10-10m3) 0.56 x 10-10m4) 0.36 x 10-10m
Answer» distance between the centres of carbonTheand oxygen atoms in the carbon monoxide0as molecule is 1.13 x 10-10m. The distanceof centre of mass of the molecule relative tocarbon atom is1) 0.48 x 10-10m2) 0.64 x 10-10m3) 0.56 x 10-10m4) 0.36 x 10-10m

Discussion

1024.	Name all the methods of concentration of ore and the principles on which they are based
Answer» Name all the methods of concentration of ore and the principles on which they are based

Discussion

1025.	Which is the important criteria for separating the mixture of two miscible liquids?
Answer» Which is the important criteria for separating the mixture of two miscible liquids?

Discussion

1026.	29. If A has 3electrons in the valence shell and b has 6 electrons in the valence shell. what is the molecular formula?
Answer» 29. If A has 3electrons in the valence shell and b has 6 electrons in the valence shell. what is the molecular formula?

Discussion

1027.	Question 4During summer, water kept in an earthen pot becomes cool because of the phenomenon of(a) diffusion(b) transpiration(c) osmosis(d) evaporation
Answer» Question 4 During summer, water kept in an earthen pot becomes cool because of the phenomenon of (a) diffusion (b) transpiration (c) osmosis (d) evaporation

Discussion

1028.	Which of the following carbonyls will have the strongest C-O bond?1)V(CO)6- 2)Fe (CO)5 3)Mn(CO)6+ 4)Cr (CO)
Answer» Which of the following carbonyls will have the strongest C-O bond?1)V(CO)6- 2)Fe (CO)5 3)Mn(CO)6+ 4)Cr (CO)

Discussion

1029.

Reactants Products Type of chemical reaction BaCl2(aq) + ZnSO4(aq) H2CO3(aq) Displacement 2AgCl(s) FeSO4(aq) + Cu(s) Combination CuSO4(aq) + Fe(s) BaSO4↓ + ZnCl2(aq) Decomposition H2O(l) + CO2(g) 2Ag(s) + Cl2(g) Double displacement

Answer»

Reactants	Products	Type of chemical reaction
BaCl₂(aq) + ZnSO₄(aq)	H₂CO₃(aq)	Displacement
2AgCl(s)	FeSO₄(aq) + Cu(s)	Combination
CuSO₄(aq) + Fe(s)	BaSO₄↓ + ZnCl₂(aq)	Decomposition
H₂O(l) + CO₂(g)	2Ag(s) + Cl₂(g)	Double displacement

Discussion

1030.	What will be the longest wavelength line in Balmerseries of spectrum of H-atom?(2) 656 nm\vert(1) 546 nm(4) 556 nm(3) 566 nm
Answer» What will be the longest wavelength line in Balmerseries of spectrum of H-atom?(2) 656 nm\vert(1) 546 nm(4) 556 nm(3) 566 nm

Discussion

1031.	Write the steps you would use for making tea. Use the words solution, solvent, solute, dissolve, soluble, insoluble, filtrate and residue.
Answer» Write the steps you would use for making tea. Use the words solution, solvent, solute, dissolve, soluble, insoluble, filtrate and residue.

Discussion

1032.	Question 8 Two substances, A and B were made to react to form a third substance, A2B according to the following reaction 2A+B→A2B. Which of the following statements concerning this reaction are incorrect? (i) The product A2B shows the properties of substances A and B. (ii) The product will always have a fixed composition. (iii) The product so formed cannot be classified as a compound. (iv) The product so formed is an element. (a) (i), (ii) and (iii) (b) (ii), (iii) and (iv) (c) (i), (iii) and (iv) (d) (ii), (iii) and (iv)
Answer» Question 8 Two substances, A and B were made to react to form a third substance, $A_{2} B$ according to the following reaction $2 A + B \to A_{2} B$ . Which of the following statements concerning this reaction are incorrect? (i) The product $A_{2} B$ shows the properties of substances A and B. (ii) The product will always have a fixed composition. (iii) The product so formed cannot be classified as a compound. (iv) The product so formed is an element. (a) (i), (ii) and (iii) (b) (ii), (iii) and (iv) (c) (i), (iii) and (iv) (d) (ii), (iii) and (iv)

Discussion

1033.	The length of seconds hand in a watch is 1 cm. The change in velocity of its tip in 15 second is
Answer» The length of seconds hand in a watch is 1 cm. The change in velocity of its tip in 15 second is

Discussion

1034.	What are the differences between physical and chemical changes?
Answer» What are the differences between physical and chemical changes?

Discussion

1035.	During the electrolysis of cupric chloride, the reactions occurring at electrodes are
Answer» During the electrolysis of cupric chloride, the reactions occurring at electrodes are

Discussion

1036.	How do non-metals achieve their nearest noble gas configuration?
Answer» How do non-metals achieve their nearest noble gas configuration?

Discussion

1037.	Two line segments AB and CD are taken. Initially, the points B & D are coincident. The line segment CD is rotated about point D such that D and B continue to be coincident till C coincides with A. The distance covered by C is y and the angle subtended by CD with respect to starting point is θ. If CD completes one full revolution about D, the distance travelled would be x. Find the relation among x,y and θ. Assume that θ is in degrees.
Answer» Two line segments AB and CD are taken. Initially, the points B & D are coincident. The line segment CD is rotated about point D such that D and B continue to be coincident till C coincides with A. The distance covered by C is $y$ and the angle subtended by CD with respect to starting point is $θ$ . If CD completes one full revolution about D, the distance travelled would be $x$ . Find the relation among $x$ , $y$ and $θ$ . Assume that $θ$ is in degrees.

Discussion

1038.	Integrate Cos(Ax)dx
Answer» Integrate Cos(Ax)dx

Discussion

1039.	(a) Why does a gas exert pressure? (b) Why does a gas fill a vessel completely? (c) Why are gases so easily compressible whereas it is almost impossible to compress a solid or a liquid?
Answer» (a) Why does a gas exert pressure? (b) Why does a gas fill a vessel completely? (c) Why are gases so easily compressible whereas it is almost impossible to compress a solid or a liquid?

1039.

(a) Why does a gas exert pressure? (b) Why does a gas fill a vessel completely? (c) Why are gases so easily compressible whereas it is almost impossible to compress a solid or a liquid?

Answer»

(a) Why does a gas exert pressure?

(b) Why does a gas fill a vessel completely?

(c) Why are gases so easily compressible whereas it is almost impossible to compress a solid or a liquid?

Discussion

1040.	Teacher, I would like to know the applications of liquifaction
Answer» Teacher, I would like to know the applications of liquifaction

1040.

Teacher, I would like to know the applications of liquifaction

Answer»

Teacher,

I would like to know the applications of liquifaction

Discussion

1041.	State some sources of hydrogen.
Answer» State some sources of hydrogen.

Discussion

1042.	Atomic mass of hydrogen is 1.008 or 1.0008?
Answer» Atomic mass of hydrogen is 1.008 or 1.0008?

Discussion

1043.	Why simple cubic unit cell arrangement is not seen in ionic solids?
Answer» Why simple cubic unit cell arrangement is not seen in ionic solids?

Discussion

1044.	Burst the bubbles that give the answer as number 9.
Answer» Burst the bubbles that give the answer as number 9.

Discussion

1045.	How to calculate the steric number of ethane, ethene and ethyne respectively.
Answer» How to calculate the steric number of ethane, ethene and ethyne respectively.

Discussion

1046.	What is a chemical change? Give examples.
Answer» What is a chemical change? Give examples.

Discussion

1047.	Calculate number of moles in 270g of Aluminium .Atomic mass of Al - 27
Answer» Calculate number of moles in 270g of Aluminium .Atomic mass of Al - 27

Discussion

1048.	Convert Ethne To Propyne
Answer» Convert Ethne To Propyne

Discussion

1049.	2. In a hydrogen atom if energy of electron in the ground state is -x eV., then in the 2nd exited state of He+ is
Answer» 2. In a hydrogen atom if energy of electron in the ground state is -x eV., then in the 2nd exited state of He+ is

Discussion

1050.	Why was mole concept introduced in writing the equations of a chemical reaction? [3 MARKS]
Answer» Why was mole concept introduced in writing the equations of a chemical reaction? [3 MARKS]

Discussion

Explore topic-wise InterviewSolutions in .

Question 10. The process of digestion is a chemical change. Justify. Give an example of a physical change that occurs by the action of heat. (3) Name the metal which is used for galvanizing iron.

what is the relationship between molality and mole fraction?

31. Explain the tautomerism in acetylacetone.

What do you understand by dissolution? Does dissolution lead to the formation of a new substance?

Gas laws establish relationship between:

The formula for a compound is given as C3H8. This is a/an

If positive charge attracts negative charge then why don't the electrons move towards the nucleus.

Assertion: The mass of Chlorine is 35.5 u Reason: For elements having isotopes, the average of mass of its isotopes is considered as the atomic mass of that element.

What are homo atomic and hetro atomic elements

What differences in the properties of oil and water enable their separation by a separating funnel ?

Q1 basicity of oxalic acid explain

What are quark particles and why are they not used as elementary unit

Question 10 (l) Classify the following into elements, compounds and mixtures. l. Carbon dioxide

Hydrogen peroxide reacts with iodine in basic medium to give:

Which of the following forms the bottom layer in the filtration tank in the purification and supply of drinking water in a city?

what is antipositron and positron?

Who am I ?(a) I’m found in a thermometer, I measure your temperature.(b) I make things hot or cold.(c) I have no shape whatsoever !(d) I dissolve in water, but not in kerosene.

Explain the formation of ozone in the atmosphere.

Write sequential observation for effect of heat on(a) copper nitrate(b) lead carbonate(c) ammonium chloride.

distance between the centres of carbonTheand oxygen atoms in the carbon monoxide0as molecule is 1.13 x 10-10m. The distanceof centre of mass of the molecule relative tocarbon atom is1) 0.48 x 10-10m2) 0.64 x 10-10m3) 0.56 x 10-10m4) 0.36 x 10-10m

Name all the methods of concentration of ore and the principles on which they are based

Which is the important criteria for separating the mixture of two miscible liquids?

29. If A has 3electrons in the valence shell and b has 6 electrons in the valence shell. what is the molecular formula?

Question 4During summer, water kept in an earthen pot becomes cool because of the phenomenon of(a) diffusion(b) transpiration(c) osmosis(d) evaporation

Which of the following carbonyls will have the strongest C-O bond?1)V(CO)6- 2)Fe (CO)5 3)Mn(CO)6+ 4)Cr (CO)

Reactants Products Type of chemical reaction BaCl2(aq) + ZnSO4(aq) H2CO3(aq) Displacement 2AgCl(s) FeSO4(aq) + Cu(s) Combination CuSO4(aq) + Fe(s) BaSO4↓ + ZnCl2(aq) Decomposition H2O(l) + CO2(g) 2Ag(s) + Cl2(g) Double displacement

What will be the longest wavelength line in Balmerseries of spectrum of H-atom?(2) 656 nm\vert(1) 546 nm(4) 556 nm(3) 566 nm

Write the steps you would use for making tea. Use the words solution, solvent, solute, dissolve, soluble, insoluble, filtrate and residue.

The length of seconds hand in a watch is 1 cm. The change in velocity of its tip in 15 second is

What are the differences between physical and chemical changes?

During the electrolysis of cupric chloride, the reactions occurring at electrodes are

How do non-metals achieve their nearest noble gas configuration?

Integrate Cos(Ax)dx

(a) Why does a gas exert pressure? (b) Why does a gas fill a vessel completely? (c) Why are gases so easily compressible whereas it is almost impossible to compress a solid or a liquid?

Teacher, I would like to know the applications of liquifaction

State some sources of hydrogen.

Atomic mass of hydrogen is 1.008 or 1.0008?

Why simple cubic unit cell arrangement is not seen in ionic solids?

Burst the bubbles that give the answer as number 9.

How to calculate the steric number of ethane, ethene and ethyne respectively.

What is a chemical change? Give examples.

Calculate number of moles in 270g of Aluminium .Atomic mass of Al - 27

Convert Ethne To Propyne

2. In a hydrogen atom if energy of electron in the ground state is -x eV., then in the 2nd exited state of He+ is

Why was mole concept introduced in writing the equations of a chemical reaction? [3 MARKS]