7248 + Interview Questions in Chemistry Page 30 InterviewSolution

1451.	82. A stone of mass 0.1 kg tied to one end of a string 1m long is revolved in a horizontal circle at the rate of 10/(22/7) rev/s . Calculate the tension in the string
Answer» 82. A stone of mass 0.1 kg tied to one end of a string 1m long is revolved in a horizontal circle at the rate of 10/(22/7) rev/s . Calculate the tension in the string

Discussion

1452.	Below is the structure of atom, which represents the __________ of hydrogen.
Answer» Below is the structure of atom, which represents the __________ of hydrogen.

Discussion

1453.	To electroplate copper on a metal object, what will you use as electrolyte, anode and cathode?
Answer» To electroplate copper on a metal object, what will you use as electrolyte, anode and cathode?

Discussion

1454.	Which is better: soap or detergent?
Answer» Which is better: soap or detergent?

Discussion

1455.	Dear sir/Ma'am I have a problem in solving this question Q. Which of them is not a greenhouse gas 1)carbon dioxide 2)sulphur dioxide 3)methane 4) nitrogen Please explain
Answer» Dear sir/Ma'am I have a problem in solving this question Q. Which of them is not a greenhouse gas 1)carbon dioxide 2)sulphur dioxide 3)methane 4) nitrogen Please explain

Discussion

1456.	Incomplete combustion of carbon based fuels like coal, wood causes -
Answer» Incomplete combustion of carbon based fuels like coal, wood causes -

Discussion

1457.	According to my textbook the calorific value of diseal is 50 wheras petrol is 47.If we go according to my textbook ,diseal has a higher calorific value than petrol.Then why is petrol still at a higher rate (cost) than diseal?
Answer» According to my textbook the calorific value of diseal is 50 wheras petrol is 47.If we go according to my textbook ,diseal has a higher calorific value than petrol.Then why is petrol still at a higher rate (cost) than diseal?

Discussion

1458.	Which of the following option shows the correct characteristics of non-metals?
Answer» Which of the following option shows the correct characteristics of non-metals?

Discussion

1459.	Which of the following are the reactants used for the production of baking soda?
Answer» Which of the following are the reactants used for the production of baking soda?

Discussion

1460.	Q21. (a) The 4f sub shell of an atom contains 12 electronsVhat is the maximum number of electrons havingthe same spin in it?(b) f M' has electronic configuration \lbrack Ar\rbrack 3d then write the configuration of M atom.(c) Write the electronic configuration of the atom with atomic number29.OR
Answer» Q21. (a) The 4f sub shell of an atom contains 12 electronsVhat is the maximum number of electrons havingthe same spin in it?(b) f M' has electronic configuration \lbrack Ar\rbrack 3d then write the configuration of M atom.(c) Write the electronic configuration of the atom with atomic number29.OR

Discussion

1461.	Name two major non-metals which are present in fertilizers and enhance the growth of plants.
Answer» Name two major non-metals which are present in fertilizers and enhance the growth of plants.

Discussion

1462.	Which is the only metal that is liquid at standard conditions of temperature and pressure?
Answer» Which is the only metal that is liquid at standard conditions of temperature and pressure?

Discussion

1463.	The total number of atoms in 2C6H12O6 is:
Answer» The total number of atoms in $2 C_{6} H_{12} O_{6}$ is:

Discussion

1464.	Explain this statement:- 'Acrylic Fibres account for about 50% of all synthetic fibres.
Answer» Explain this statement:- 'Acrylic Fibres account for about 50% of all synthetic fibres.

Discussion

1465.	Water is pure and fit for drinking when it is ___.
Answer» Water is pure and fit for drinking when it is ___.

Discussion

1466.	Where would you find cleaner air, a city or a village? Reason out. [3 MARKS]
Answer» Where would you find cleaner air, a city or a village? Reason out. [3 MARKS]

Discussion

1467.	What is meant by water of crystallisation of a substance? Describe an activity to show that.
Answer» What is meant by water of crystallisation of a substance? Describe an activity to show that.

Discussion

1468.	30. Which of the following is the strongest oxidising agent? a)HClO b)HClO2 c)HClO3 d)HClO4
Answer» 30. Which of the following is the strongest oxidising agent? a)HClO b)HClO2 c)HClO3 d)HClO4

Discussion

1469.	The vapour pressure of pure liquids A and B are 450 & 700 mmHg respectively at 350 k . Find out the composition of liquid mixture if total pressure is 600 mmHg .Also find the composition of the vapour phas
Answer» The vapour pressure of pure liquids A and B are 450 & 700 mmHg respectively at 350 k . Find out the composition of liquid mixture if total pressure is 600 mmHg .Also find the composition of the vapour phas

Discussion

1470.	Name the man -made fibre perpared from natural materials.
Answer» Name the man -made fibre perpared from natural materials.

Discussion

1471.	Question 42When a metal X is treated with cold water, it gives a base Y with molecular formula XOH (Molecular mass = 40) and liberates a gas Z, which easily catches fire. Identify X, Y and Z and also write the reaction involved.
Answer» Question 42 When a metal X is treated with cold water, it gives a base Y with molecular formula XOH (Molecular mass = 40) and liberates a gas Z, which easily catches fire. Identify X, Y and Z and also write the reaction involved.

Discussion

1472.	Al2O3+HCl→________
Answer» $A l_{2} O_{3} + H C l \to________$

Discussion

1473.	Name two synthetic fibres
Answer» Name two synthetic fibres

Discussion

1474.	Explain why burning of wood and cutting it into small pieces are considered as two different types of changes.
Answer» Explain why burning of wood and cutting it into small pieces are considered as two different types of changes.

Discussion

1475.	Why is it easier to pull a lawn mower rather than push?
Answer» Why is it easier to pull a lawn mower rather than push?

Discussion

1476.	What is polar protic solvent?
Answer» What is polar protic solvent?

Discussion

1477.	Differentiate between the terms - elements, and compounds.
Answer» Differentiate between the terms - elements, and compounds.

Discussion

1478.	The law of conservation of energy states that:
Answer» The law of conservation of energy states that:

Discussion

1479.	how to convert ketone to carboxylic acid?
Answer» how to convert ketone to carboxylic acid?

Discussion

1480.	Give two uses each for Kerosene and Diesel. [3 MARKS]
Answer» Give two uses each for Kerosene and Diesel. [3 MARKS]

Discussion

1481.	75. why could gold is not a good conductor
Answer» 75. why could gold is not a good conductor

Discussion

1482.	Which of the following relations represents the correct relationship between empirical formula and molecular formula?
Answer» Which of the following relations represents the correct relationship between empirical formula and molecular formula?

Discussion

1483.	If velocity of an electron in a Bohr orbit (n) of hydrogen is given by 'V' , then value of n is equal to a. 2πe^2 /Vb. 2πe^2 /Vhc. Vh/2πe^2d. e^2 π /2Vh
Answer» If velocity of an electron in a Bohr orbit (n) of hydrogen is given by 'V' , then value of n is equal to a. 2πe^2 /V b. 2πe^2 /Vh c. Vh/2πe^2 d. e^2 π /2Vh

Discussion

1484.	In a hydrogen atom following Bohr's postulates, the product of magnitude of linear momentum and magnitude of angular momentum is proportional to(n)^xwhere n is the orbit number, then x is (1)-2 (2)0 (3)1 (4)
Answer» In a hydrogen atom following Bohr's postulates, the product of magnitude of linear momentum and magnitude of angular momentum is proportional to(n)^xwhere n is the orbit number, then x is (1)-2 (2)0 (3)1 (4)

Discussion

1485.	14. What is the difference between sublimation of a compound or boiling point of a compund? Are both the trends sane in compounds of nitrogen and other?? How to check these trends?
Answer» 14. What is the difference between sublimation of a compound or boiling point of a compund? Are both the trends sane in compounds of nitrogen and other?? How to check these trends?

Discussion

1486.	The heat of combustion of carbon to CO2 is -393.5Kj/mol. The heat rrleased upon formtion of 35.2 g of CO2 from carbn and oxygem gad is
Answer» The heat of combustion of carbon to CO2 is -393.5Kj/mol. The heat rrleased upon formtion of 35.2 g of CO2 from carbn and oxygem gad is

Discussion

1487.	Pure gold should be alloyed with how many parts of silver (or copper) in order to make 18 carat gold? (a)4 (b)6 (c)2 (d)8
Answer» Pure gold should be alloyed with how many parts of silver (or copper) in order to make 18 carat gold? (a)4 (b)6 (c)2 (d)8

Discussion

1488.	The outermost zone of flame is in colour.
Answer» The outermost zone of flame is in colour.

Discussion

1489.	State the chemical properties on which the following uses of baking soda are based: as an antacid as a soda fire extinguisher to make cake soft and spongy
Answer» State the chemical properties on which the following uses of baking soda are based: as an antacid as a soda fire extinguisher to make cake soft and spongy

1489.

State the chemical properties on which the following uses of baking soda are based: as an antacid as a soda fire extinguisher to make cake soft and spongy

Answer»

State the chemical properties on which the following uses of baking soda are based:

as an antacid

as a soda fire extinguisher

to make cake soft and spongy

Discussion

1490.	On the basis of the following features, identify the correct material. I. It is a natural polymer with elastic properties. II. It is a polymer formed by the combination of monomer molecules, isoprene. III. It is widely used for making goods like raincoats, gumboots, footwear, etc.
Answer» On the basis of the following features, identify the correct material. I. It is a natural polymer with elastic properties. II. It is a polymer formed by the combination of monomer molecules, isoprene. III. It is widely used for making goods like raincoats, gumboots, footwear, etc.

Discussion

1491.	Complete combustion of carbon leads to formation of _________
Answer» Complete combustion of carbon leads to formation of _________

Discussion

1492.	Name the base formed when: 1. Sodium reacts with oxygen 2. Sodium oxide reacts with water 3. Copper oxide reacts with sulphuric acid 4. Sodium hydroxide reacts with (\H_2SO_4\)
Answer» Name the base formed when: 1. Sodium reacts with oxygen 2. Sodium oxide reacts with water 3. Copper oxide reacts with sulphuric acid 4. Sodium hydroxide reacts with (\H_2SO_4\)

Discussion

1493.	why berzelius hypothesis conflicts dalton atomic theory ? why avagrado's law does not conflicts with dalton atomic theory?
Answer» why berzelius hypothesis conflicts dalton atomic theory ? why avagrado's law does not conflicts with dalton atomic theory?

Discussion

1494.	What is the value of angular momentum of electron in the second orbit of Bohr's model of hydrogen atom?
Answer» What is the value of angular momentum of electron in the second orbit of Bohr's model of hydrogen atom?

Discussion

1495.	31. An organometallic compound gave c=64.4%,H=5.5% and fe=29.9%. Determine its simplest formula.
Answer» 31. An organometallic compound gave c=64.4%,H=5.5% and fe=29.9%. Determine its simplest formula.

Discussion

1496.	Classify each of the following reactions as combination, decomposition, displacement or double displacement reaction. [5 MARKS] BaCl2+H2SO4→BaSO4+2HCl CaO+CO2→CaCO3 CaCO3→CaO+CO2 2KI+Cl2→2KCl+I2 2H2O→2H2+O2
Answer» Classify each of the following reactions as combination, decomposition, displacement or double displacement reaction. [5 MARKS] ${BaCl}_{2} + H_{2} {SO}_{4} \to {BaSO}_{4} + 2 HCl$ $CaO + {CO}_{2} \to {CaCO}_{3}$ ${CaCO}_{3} \to CaO + {CO}_{2}$ $2 KI + {Cl}_{2} \to 2 KCl + I_{2}$ $2 H_{2} O \to 2 H_{2} + O_{2}$

1496.

Classify each of the following reactions as combination, decomposition, displacement or double displacement reaction. [5 MARKS] BaCl2+H2SO4→BaSO4+2HCl CaO+CO2→CaCO3 CaCO3→CaO+CO2 2KI+Cl2→2KCl+I2 2H2O→2H2+O2

Answer»

Classify each of the following reactions as combination, decomposition, displacement or double displacement reaction. [5 MARKS]

${BaCl}_{2} + H_{2} {SO}_{4} \to {BaSO}_{4} + 2 HCl$

$CaO + {CO}_{2} \to {CaCO}_{3}$

${CaCO}_{3} \to CaO + {CO}_{2}$

$2 KI + {Cl}_{2} \to 2 KCl + I_{2}$

$2 H_{2} O \to 2 H_{2} + O_{2}$

Discussion

1497.	39 The heat of combustion of ethene (C.H)is -1409.3 kJ/mol. Calculate the weight ofethene required to produce 470 kJ of heat oncombustion.(2) 9.34 g(1) 12.5 g(4) 18.4 g(3) 23 g
Answer» 39 The heat of combustion of ethene (C.H)is -1409.3 kJ/mol. Calculate the weight ofethene required to produce 470 kJ of heat oncombustion.(2) 9.34 g(1) 12.5 g(4) 18.4 g(3) 23 g

Discussion

1498.	What is PVC? What does it stand for?
Answer» What is PVC? What does it stand for?

Discussion

1499.	Give reasons: (a) Sand and saw dust cannot be separated by hand picking.(b) Magnet is used to separate a mixture of iron and sulphur.
Answer» Give reasons: (a) Sand and saw dust cannot be separated by hand picking. (b) Magnet is used to separate a mixture of iron and sulphur.

Discussion

1500.	What were the ingredients of the cement that the Romans used?
Answer» What were the ingredients of the cement that the Romans used?

Discussion

Explore topic-wise InterviewSolutions in .

82. A stone of mass 0.1 kg tied to one end of a string 1m long is revolved in a horizontal circle at the rate of 10/(22/7) rev/s . Calculate the tension in the string

Below is the structure of atom, which represents the __________ of hydrogen.

To electroplate copper on a metal object, what will you use as electrolyte, anode and cathode?

Which is better: soap or detergent?

Dear sir/Ma'am I have a problem in solving this question Q. Which of them is not a greenhouse gas 1)carbon dioxide 2)sulphur dioxide 3)methane 4) nitrogen Please explain

Incomplete combustion of carbon based fuels like coal, wood causes -

According to my textbook the calorific value of diseal is 50 wheras petrol is 47.If we go according to my textbook ,diseal has a higher calorific value than petrol.Then why is petrol still at a higher rate (cost) than diseal?

Which of the following option shows the correct characteristics of non-metals?

Which of the following are the reactants used for the production of baking soda?

Q21. (a) The 4f sub shell of an atom contains 12 electronsVhat is the maximum number of electrons havingthe same spin in it?(b) f M' has electronic configuration \lbrack Ar\rbrack 3d then write the configuration of M atom.(c) Write the electronic configuration of the atom with atomic number29.OR

Name two major non-metals which are present in fertilizers and enhance the growth of plants.​

Which is the only metal that is liquid at standard conditions of temperature and pressure?

The total number of atoms in 2C6H12O6 is:

Explain this statement:- 'Acrylic Fibres account for about 50% of all synthetic fibres.

Water is pure and fit for drinking when it is ___.

Where would you find cleaner air, a city or a village? Reason out. [3 MARKS]

What is meant by water of crystallisation of a substance? Describe an activity to show that.

30. Which of the following is the strongest oxidising agent? a)HClO b)HClO2 c)HClO3 d)HClO4

The vapour pressure of pure liquids A and B are 450 & 700 mmHg respectively at 350 k . Find out the composition of liquid mixture if total pressure is 600 mmHg .Also find the composition of the vapour phas

Name the man -made fibre perpared from natural materials.

Question 42When a metal X is treated with cold water, it gives a base Y with molecular formula XOH (Molecular mass = 40) and liberates a gas Z, which easily catches fire. Identify X, Y and Z and also write the reaction involved.

Al2O3+HCl→________

Name two synthetic fibres

Explain why burning of wood and cutting it into small pieces are considered as two different types of changes.

Why is it easier to pull a lawn mower rather than push?

What is polar protic solvent?

Differentiate between the terms - elements, and compounds.

The law of conservation of energy states that:

how to convert ketone to carboxylic acid?

Give two uses each for Kerosene and Diesel. [3 MARKS]

75. why could gold is not a good conductor

Which of the following relations represents the correct relationship between empirical formula and molecular formula?

If velocity of an electron in a Bohr orbit (n) of hydrogen is given by 'V' , then value of n is equal to a. 2πe^2 /Vb. 2πe^2 /Vhc. Vh/2πe^2d. e^2 π /2Vh

In a hydrogen atom following Bohr's postulates, the product of magnitude of linear momentum and magnitude of angular momentum is proportional to(n)^xwhere n is the orbit number, then x is (1)-2 (2)0 (3)1 (4)

14. What is the difference between sublimation of a compound or boiling point of a compund? Are both the trends sane in compounds of nitrogen and other?? How to check these trends?

The heat of combustion of carbon to CO2 is -393.5Kj/mol. The heat rrleased upon formtion of 35.2 g of CO2 from carbn and oxygem gad is

Pure gold should be alloyed with how many parts of silver (or copper) in order to make 18 carat gold? (a)4 (b)6 (c)2 (d)8

The outermost zone of flame is in colour.

State the chemical properties on which the following uses of baking soda are based: as an antacid as a soda fire extinguisher to make cake soft and spongy

On the basis of the following features, identify the correct material. I. It is a natural polymer with elastic properties. II. It is a polymer formed by the combination of monomer molecules, isoprene. III. It is widely used for making goods like raincoats, gumboots, footwear, etc.

Complete combustion of carbon leads to formation of _________

Name the base formed when: 1. Sodium reacts with oxygen 2. Sodium oxide reacts with water 3. Copper oxide reacts with sulphuric acid 4. Sodium hydroxide reacts with (\H_2SO_4\)

why berzelius hypothesis conflicts dalton atomic theory ? why avagrado's law does not conflicts with dalton atomic theory?

What is the value of angular momentum of electron in the second orbit of Bohr's model of hydrogen atom?

31. An organometallic compound gave c=64.4%,H=5.5% and fe=29.9%. Determine its simplest formula.

Classify each of the following reactions as combination, decomposition, displacement or double displacement reaction. [5 MARKS] BaCl2+H2SO4→BaSO4+2HCl CaO+CO2→CaCO3 CaCO3→CaO+CO2 2KI+Cl2→2KCl+I2 2H2O→2H2+O2

39 The heat of combustion of ethene (C.H)is -1409.3 kJ/mol. Calculate the weight ofethene required to produce 470 kJ of heat oncombustion.(2) 9.34 g(1) 12.5 g(4) 18.4 g(3) 23 g

What is PVC? What does it stand for?

Give reasons: (a) Sand and saw dust cannot be separated by hand picking.(b) Magnet is used to separate a mixture of iron and sulphur.

What were the ingredients of the cement that the Romans used?

Name two major non-metals which are present in fertilizers and enhance the growth of plants.