10223 + Interview Questions in Chemistry Page 180 InterviewSolution

8951.	A rubber band can change its shape on stretching.will u classify it as solid or not?why?
Answer» A rubber band can change its shape on stretching.will u classify it as solid or not?why?

Discussion

8952.	An element X occurs in nature in three isotopic forms with masses 30u, 32u and 33 u in the ratio 3:3:4. What is the average mass of element X?
Answer» An element X occurs in nature in three isotopic forms with masses 30u, 32u and 33 u in the ratio 3:3:4. What is the average mass of element X?

Discussion

8953.	Which of the following is the poorest conductor of heat?
Answer» Which of the following is the poorest conductor of heat?

Discussion

8954.	A gas exerts pressure on the walls of the container. Identify the correct reason for the same.
Answer» A gas exerts pressure on the walls of the container. Identify the correct reason for the same.

Discussion

8955.	Metals can be drawn into long wires by the property called _______.
Answer» Metals can be drawn into long wires by the property called _______.

Discussion

8956.	How to separate the components of a gun powder
Answer» How to separate the components of a gun powder

Discussion

8957.	What is the gas that emanates from cold objects when exposed to normal temperature?why does it happen?
Answer» What is the gas that emanates from cold objects when exposed to normal temperature?why does it happen?

Discussion

8958.	That distribution of electrons in an atom of potassium is what?
Answer» That distribution of electrons in an atom of potassium is what?

Discussion

8959.	Hydrogen resembles halogens in many respects for which several factor are responsible.Of the following factors which one is the most important in this respect?
Answer» Hydrogen resembles halogens in many respects for which several factor are responsible.Of the following factors which one is the most important in this respect?

Discussion

8960.	Mendeleev's classification was based on _______ .
Answer» Mendeleev's classification was based on _______ .

Discussion

8961.	What is the particulate nature of matter
Answer» What is the particulate nature of matter

Discussion

8962.	Which series of reactions correctly represents chemical relations related to iron and its compound?
Answer» Which series of reactions correctly represents chemical relations related to iron and its compound?

Discussion

8963.	Question 1 You are given a mixture of sand , water and mustard oil?how will you separate the components of the mixture,explain with the help of different separation methods ? Question 2 define solubility?how does solubility of a solid in water changes with water .
Answer» Question 1 You are given a mixture of sand , water and mustard oil?how will you separate the components of the mixture,explain with the help of different separation methods ? Question 2 define solubility?how does solubility of a solid in water changes with water .

8963.

Question 1 You are given a mixture of sand , water and mustard oil?how will you separate the components of the mixture,explain with the help of different separation methods ? Question 2 define solubility?how does solubility of a solid in water changes with water .

Answer»

Question 1 You are given a mixture of sand , water and mustard oil?how will you separate the components of the mixture,explain with the help of different separation methods ?

Question 2 define solubility?how does solubility of a solid in water changes with water .

Discussion

8964.	how 1 amu is equivalent to gram/mole
Answer» how 1 amu is equivalent to gram/mole

Discussion

8965.	I heard that the boiling point of liquid oxygen is -183 degree celsius what does the minus sign indicate here
Answer» I heard that the boiling point of liquid oxygen is -183 degree celsius what does the minus sign indicate here

Discussion

8966.	Question 16 Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).
Answer» Question 16 Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).

Discussion

8967.	Pressure and addition of solutes to water are directly proportional to the melting point of the substance (eg:-ice).TRUE or FALSE.
Answer» Pressure and addition of solutes to water are directly proportional to the melting point of the substance (eg:-ice).TRUE or FALSE.

Discussion

8968.	How many moles of oxygen are present in 18 gms Water?
Answer» How many moles of oxygen are present in 18 gms Water?

Discussion

8969.	When 3.0g of carbon is burnt in 8.00g oxygen, 11.00g of carbon dioxide is produced. What mass of carbon dioxide will be formed when 3.00g of carbon is burnt in 50g of oxygen? Which law of chemical combination will govern your answer?
Answer» When 3.0g of carbon is burnt in 8.00g oxygen, 11.00g of carbon dioxide is produced. What mass of carbon dioxide will be formed when 3.00g of carbon is burnt in 50g of oxygen? Which law of chemical combination will govern your answer?

Discussion

8970.	Define polyatomic ion. Give one example
Answer» Define polyatomic ion. Give one example

Discussion

8971.	Helium is an unreactive gas and neon is a gas of extremely low reactivity. What do their atoms have in common?
Answer» Helium is an unreactive gas and neon is a gas of extremely low reactivity. What do their atoms have in common?

Discussion

8972.	What is chromatography? State its two applications.
Answer» What is chromatography? State its two applications.

Discussion

8973.	Explain why, the atomic masses of many elements are in fractions and not whole numbers.
Answer» Explain why, the atomic masses of many elements are in fractions and not whole numbers.

Discussion

8974.	What do the symbols, H2,S and O4 mean in the formla H2SO4?
Answer» What do the symbols, $H_{2}, S$ and $O_{4}$ mean in the formla $H_{2} S O_{4}$ ?

Discussion

8975.	What are hyperfine levels?
Answer» What are hyperfine levels?

Discussion

8976.	Do liquids have a fixed volume?
Answer» Do liquids have a fixed volume?

Discussion

8977.	Why is it said that atoms cannot usually gain or lose 4 electrons? Is it possible under special conditions?
Answer» Why is it said that atoms cannot usually gain or lose 4 electrons? Is it possible under special conditions?

Discussion

8978.	Pb(NO3)2(aq)+2KCl(aq)→2KNO3(aq)+PbCl2(s) When lead nitrate solution is mixed with potassium chloride solution, a precipitate of lead chloride and potassium nitrate solution are formed. This type of reaction is called _________________.
Answer» $P b (N O_{3})_{2} (a q) + 2 K C l (a q) \to 2 K N O_{3} (a q) + P b C l_{2} (s)$ When lead nitrate solution is mixed with potassium chloride solution, a precipitate of lead chloride and potassium nitrate solution are formed. This type of reaction is called _________________.

8978.

Pb(NO3)2(aq)+2KCl(aq)→2KNO3(aq)+PbCl2(s) When lead nitrate solution is mixed with potassium chloride solution, a precipitate of lead chloride and potassium nitrate solution are formed. This type of reaction is called _________________.

Answer»

$P b (N O_{3})_{2} (a q) + 2 K C l (a q) \to 2 K N O_{3} (a q) + P b C l_{2} (s)$

When lead nitrate solution is mixed with potassium chloride solution, a precipitate of lead chloride and potassium nitrate solution are formed. This type of reaction is called _________________.

Discussion

8979.	Why do metals have lesser colours than non metals
Answer» Why do metals have lesser colours than non metals

Discussion

8980.	What is physical and chemical change
Answer» What is physical and chemical change

Discussion

8981.	The electronic configuration of three elements X, Y and Z are given below X2 Y2,6 Z2,8,2 Which element belongs to the second group?
Answer» The electronic configuration of three elements X, Y and Z are given below $\begin{matrix} X & 2 Y & 2, & 6 Z & 2, & 8, & 2 \end{matrix}$ Which element belongs to the second group?

Discussion

8982.	Select the uses of Oxygen.
Answer» Select the uses of Oxygen.

Discussion

8983.	Question 110 (ii) Science Application An atom consists of charged particles called electrons and protons. Each proton has a charge of +1 and each electron has a charge -1. Remember the number of electrons is equal to the number of protons, while answering this question : What will be the charge on an atom, if it loses an electron?
Answer» Question 110 (ii) Science Application An atom consists of charged particles called electrons and protons. Each proton has a charge of +1 and each electron has a charge -1. Remember the number of electrons is equal to the number of protons, while answering this question : What will be the charge on an atom, if it loses an electron?

8983.

Question 110 (ii) Science Application An atom consists of charged particles called electrons and protons. Each proton has a charge of +1 and each electron has a charge -1. Remember the number of electrons is equal to the number of protons, while answering this question : What will be the charge on an atom, if it loses an electron?

Answer»

Question 110 (ii)

Science Application An atom consists of charged particles called electrons and protons. Each proton has a charge of +1 and each electron has a charge -1. Remember the number of electrons is equal to the number of protons, while answering this question :
What will be the charge on an atom, if it loses an electron?

Discussion

8984.	Differentiate between physical and chemical change with an example of each. [3 MARKS]
Answer» Differentiate between physical and chemical change with an example of each. [3 MARKS]

Discussion

8985.	Arrange the gases present in the air in the increasing order of their boiling points Which gas gets liquified first when the air gets compressed?
Answer» Arrange the gases present in the air in the increasing order of their boiling points Which gas gets liquified first when the air gets compressed?

8985.

Arrange the gases present in the air in the increasing order of their boiling points Which gas gets liquified first when the air gets compressed?

Answer»

Arrange the gases present in the air in the increasing order of their boiling points

Which gas gets liquified first when the air gets compressed?

Discussion

8986.	Wet clothes dry quickly under sun than in shade. Explain
Answer» Wet clothes dry quickly under sun than in shade. Explain

Discussion

8987.	Iron and sulphur on being heated forms
Answer» Iron and sulphur on being heated forms

Discussion

8988.	Which of the following are chemical and physical change a)growt of plant B)rusting of iron C)mixi of iron filings and sand D)cookin of food E)digesti of food F) freezing of water G)burni of candle
Answer» Which of the following are chemical and physical change a)growt of plant B)rusting of iron C)mixi of iron filings and sand D)cookin of food E)digesti of food F) freezing of water G)burni of candle

Discussion

8989.	Boric acid is an acid because its molecule
Answer» Boric acid is an acid because its molecule

Discussion

8990.	What is the difference between gas and vapour?
Answer» What is the difference between gas and vapour?

Discussion

8991.	If we bring a comb near some small pieces of paper, nothing happens but if we comb our hair and then bring this comb near the pieces of paper, it attracts the pieces of paper towards it. Why?
Answer» If we bring a comb near some small pieces of paper, nothing happens but if we comb our hair and then bring this comb near the pieces of paper, it attracts the pieces of paper towards it. Why?

Discussion

8992.	How is the impurity of iron present in several substances removed in industries?
Answer» How is the impurity of iron present in several substances removed in industries?

Discussion

8993.	The mass per unit volume of a substance is called density (density = mass/volume). Arrange the following in order of increasing density - air, exhaust from chimney, honey, water, chalk, cotton, and iron.
Answer» The mass per unit volume of a substance is called density (density = mass/volume). Arrange the following in order of increasing density - air, exhaust from chimney, honey, water, chalk, cotton, and iron.

Discussion

8994.	Which of the following is correct regarding the densities of kerosene and water?
Answer» Which of the following is correct regarding the densities of kerosene and water?

Discussion

8995.	Question 1 (e) Classify the following as chemical or physical changes: e. Passing of electric current, through water and the water breaking down into hydrogen and oxygen gases
Answer» Question 1 (e) Classify the following as chemical or physical changes: e. Passing of electric current, through water and the water breaking down into hydrogen and oxygen gases

Discussion

8996.	An neutral element A has 3 electrons, the atomic number of the element is _______ .
Answer» An neutral element A has 3 electrons, the atomic number of the element is _______ .

Discussion

8997.	A boy is punished and is instructed to run around a circular track on the ground for 1 hour, he loses all his energy in half an hour and falls down. Imagine the boy to be an electron and the ground as an atom. Drawback of which atomic model can you relate to this?
Answer» A boy is punished and is instructed to run around a circular track on the ground for 1 hour, he loses all his energy in half an hour and falls down. Imagine the boy to be an electron and the ground as an atom. Drawback of which atomic model can you relate to this?

Discussion

8998.	Among iron, chalk and wood, iron is hard to break. It is because
Answer» Among iron, chalk and wood, iron is hard to break. It is because

Discussion

8999.	Hydrogen will not reduce
Answer» Hydrogen will not reduce

8999.

Hydrogen will not reduce

Answer»

Hydrogen will not reduce

Discussion

9000.	How will you separate a mixture of cooking oil (groundnut oil) and water?
Answer» How will you separate a mixture of cooking oil (groundnut oil) and water?

Discussion

Explore topic-wise InterviewSolutions in .

A rubber band can change its shape on stretching.will u classify it as solid or not?why?

An element X occurs in nature in three isotopic forms with masses 30u, 32u and 33 u in the ratio 3:3:4. What is the average mass of element X?

Which of the following is the poorest conductor of heat?

A gas exerts pressure on the walls of the container. Identify the correct reason for the same.

Metals can be drawn into long wires by the property called _______.

How to separate the components of a gun powder

What is the gas that emanates from cold objects when exposed to normal temperature?why does it happen?

That distribution of electrons in an atom of potassium is what?

Hydrogen resembles halogens in many respects for which several factor are responsible.Of the following factors which one is the most important in this respect?

Mendeleev's classification was based on _______ .

What is the particulate nature of matter

Which series of reactions correctly represents chemical relations related to iron and its compound?

Question 1 You are given a mixture of sand , water and mustard oil?how will you separate the components of the mixture,explain with the help of different separation methods ? Question 2 define solubility?how does solubility of a solid in water changes with water .

how 1 amu is equivalent to gram/mole

I heard that the boiling point of liquid oxygen is -183 degree celsius what does the minus sign indicate here

Question 16 Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).

Pressure and addition of solutes to water are directly proportional to the melting point of the substance (eg:-ice).TRUE or FALSE.

How many moles of oxygen are present in 18 gms Water?

When 3.0g of carbon is burnt in 8.00g oxygen, 11.00g of carbon dioxide is produced. What mass of carbon dioxide will be formed when 3.00g of carbon is burnt in 50g of oxygen? Which law of chemical combination will govern your answer?

Define polyatomic ion. Give one example

Helium is an unreactive gas and neon is a gas of extremely low reactivity. What do their atoms have in common?

What is chromatography? State its two applications.

Explain why, the atomic masses of many elements are in fractions and not whole numbers.

What do the symbols, H2,S and O4 mean in the formla H2SO4?

What are hyperfine levels?

Do liquids have a fixed volume?

Why is it said that atoms cannot usually gain or lose 4 electrons? Is it possible under special conditions?

Pb(NO3)2(aq)+2KCl(aq)→2KNO3(aq)+PbCl2(s) When lead nitrate solution is mixed with potassium chloride solution, a precipitate of lead chloride and potassium nitrate solution are formed. This type of reaction is called _________________.

Why do metals have lesser colours than non metals

What is physical and chemical change

The electronic configuration of three elements X, Y and Z are given below X2 Y2,6 Z2,8,2 Which element belongs to the second group?

Select the uses of Oxygen.

Differentiate between physical and chemical change with an example of each. [3 MARKS]

Arrange the gases present in the air in the increasing order of their boiling points Which gas gets liquified first when the air gets compressed?

Wet clothes dry quickly under sun than in shade. Explain

Iron and sulphur on being heated forms

Which of the following are chemical and physical change a)growt of plant B)rusting of iron C)mixi of iron filings and sand D)cookin of food E)digesti of food F) freezing of water G)burni of candle

Boric acid is an acid because its molecule

What is the difference between gas and vapour?

If we bring a comb near some small pieces of paper, nothing happens but if we comb our hair and then bring this comb near the pieces of paper, it attracts the pieces of paper towards it. Why?

How is the impurity of iron present in several substances removed in industries?

The mass per unit volume of a substance is called density (density = mass/volume). Arrange the following in order of increasing density - air, exhaust from chimney, honey, water, chalk, cotton, and iron.

Which of the following is correct regarding the densities of kerosene and water?

Question 1 (e) Classify the following as chemical or physical changes: e. Passing of electric current, through water and the water breaking down into hydrogen and oxygen gases

An neutral element A has 3 electrons, the atomic number of the element is _______ .

A boy is punished and is instructed to run around a circular track on the ground for 1 hour, he loses all his energy in half an hour and falls down. Imagine the boy to be an electron and the ground as an atom. Drawback of which atomic model can you relate to this?

Among iron, chalk and wood, iron is hard to break. It is because

Hydrogen will not reduce

How will you separate a mixture of cooking oil (groundnut oil) and water?