7248 + Interview Questions in Chemistry Page 12 InterviewSolution

551.	What is dry ice? Why is dry ice more dangerous than the normal ice cubes?
Answer» What is dry ice? Why is dry ice more dangerous than the normal ice cubes?

Discussion

552.	Time period of revolution of electron in the second orbit of singly ionised helium atom isaboutOptions:2 10-9 S2.5 x 10310 s4.2 x 10-14-16-12
Answer» Time period of revolution of electron in the second orbit of singly ionised helium atom isaboutOptions:2 10-9 S2.5 x 10310 s4.2 x 10-14-16-12

Discussion

553.	Water contains hydrogen then why doesn't it burn?
Answer» Water contains hydrogen then why doesn't it burn?

Discussion

554.	18. describe STP and NTP concept in context of mole
Answer» 18. describe STP and NTP concept in context of mole

Discussion

555.	64. The effective nuclear charge of an element with 3 valence electrons is 2.60. What is the atomic number of the element? D.-13.6 eV
Answer» 64. The effective nuclear charge of an element with 3 valence electrons is 2.60. What is the atomic number of the element? D.-13.6 eV

Discussion

556.	According to Mosley, a straight line graph is obtained on plotting
Answer» According to Mosley, a straight line graph is obtained on plotting

Discussion

557.	Evaporation is a __ phenomenon.
Answer» Evaporation is a __ phenomenon.

Discussion

558.	The following figure shows irreversible change because,
Answer» The following figure shows irreversible change because,

558.

The following figure shows irreversible change because,

Answer»

The following figure shows irreversible change because,

Discussion

559.	What is h-atom abstraction ? Explain with proper diagram and explanation
Answer» What is h-atom abstraction ? Explain with proper diagram and explanation

Discussion

560.	The electron mobility in N-type germanium is 3900 cm2/v−s and its conductivity is 6.24 mho/cm; If the effect of cotters is negligible, then the impurity concentration will be
Answer» The electron mobility in N-type germanium is $3900 {cm}^{2} / v - s$ and its conductivity is $6.24 mho / cm$ ; If the effect of cotters is negligible, then the impurity concentration will be

Discussion

561.	Temporary hardness of water can be removed by Clark's Method using:
Answer» Temporary hardness of water can be removed by Clark's Method using:

Discussion

562.	nameing of hydrocarbon with complex sutitl
Answer» nameing of hydrocarbon with complex sutitl

Discussion

563.	Synthetic fibres are strong, elastic, light, wrinkle-resistant, and easy to wash and dry. Even with so many advantages, we do not wear clothes made of pure synthetic fibres, but a mixture of synthetic and natural fibres. Why is this necessary?
Answer» Synthetic fibres are strong, elastic, light, wrinkle-resistant, and easy to wash and dry. Even with so many advantages, we do not wear clothes made of pure synthetic fibres, but a mixture of synthetic and natural fibres. Why is this necessary?

Discussion

564.	Kinetic energy and potential energy (in eV) of electron present in second Bohr orbit of hydrogen atom are respectively (energy of first Bohr orbit=-13.6eV1. -13.6, -27.22. -1.51, -3.023. 3.4, -6.84. 3.02, -1.51
Answer» Kinetic energy and potential energy (in eV) of electron present in second Bohr orbit of hydrogen atom are respectively (energy of first Bohr orbit=-13.6eV 1. -13.6, -27.2 2. -1.51, -3.02 3. 3.4, -6.8 4. 3.02, -1.51

Discussion

565.	Define rapid combustion
Answer» Define rapid combustion

Discussion

566.	Sunil went to a cloth shop. There he found a fabric which was smooth to touch, had vibrant colour and shine. The fabric could be ___.
Answer» Sunil went to a cloth shop. There he found a fabric which was smooth to touch, had vibrant colour and shine. The fabric could be ___.

Discussion

567.	Write any 3causes of green house effect
Answer» Write any 3causes of green house effect

Discussion

568.	An iron tyre is to fitted on wooden wheel 1 m in diameter .the diameter of the is 6 mm is smaller than that of wheel . The tyre should be heated so that it's temp. Is increase by min. of (alpha for iron is 3.610-5)
Answer» An iron tyre is to fitted on wooden wheel 1 m in diameter .the diameter of the is 6 mm is smaller than that of wheel . The tyre should be heated so that it's temp. Is increase by min. of (alpha for iron is 3.610-5)

Discussion

569.	Which is the element with the most metallic character?
Answer» Which is the element with the most metallic character?

Discussion

570.	Name one non metal which is liquid at room temperature
Answer» Name one non metal which is liquid at room temperature

Discussion

571.	Read the following statements.A. A few rivers in India are like sewers.B. Some cattle may die by feeding on plastic bags.C. Installation of wastewater treatment plants has cleaned up most of the rivers in India.D. Sludge is effectively utilized in the production of biogas.Select the option which includes all correct statements.
Answer» Read the following statements. A. A few rivers in India are like sewers. B. Some cattle may die by feeding on plastic bags. C. Installation of wastewater treatment plants has cleaned up most of the rivers in India. D. Sludge is effectively utilized in the production of biogas. Select the option which includes all correct statements.

Discussion

572.	When a conservative force does positive work on a body, then the (1) Potential energy of body increases (2) Potential energy of body decreases (3) Total mechanical energy of body increases (4) Total mechanical energy of body decreases
Answer» When a conservative force does positive work on a body, then the (1) Potential energy of body increases (2) Potential energy of body decreases (3) Total mechanical energy of body increases (4) Total mechanical energy of body decreases

Discussion

573.	Question 7Generally, metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals, except Mn and Mg?(a) H2SO4(b) HCl(c) HNO3(d) All of these
Answer» Question 7 Generally, metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals, except $Mn$ and $Mg$ ? (a) $H_{2} {SO}_{4}$ (b) $HCl$ (c) ${HNO}_{3}$ (d) All of these

Discussion

574.	Boiling purifies water because:
Answer» Boiling purifies water because:

Discussion

575.	The volume of water to be added to 50 cm3 of a 0.5 N HCl to get a decinormal solution is:
Answer» The volume of water to be added to $50 {cm}^{3}$ of a $0.5 N H C l$ to get a decinormal solution is:

Discussion

576.	Give reason : Double displacement reaction takes place only in aqueous medium.
Answer» Give reason : Double displacement reaction takes place only in aqueous medium.

Discussion

577.	Question 43A non-metal X exists in two different forms Y and Z. Y is the hardest natural substance, whereas Z is a good conductor of electricity. Identify X, Y and Z.
Answer» Question 43 A non-metal X exists in two different forms Y and Z. Y is the hardest natural substance, whereas Z is a good conductor of electricity. Identify X, Y and Z.

Discussion

578.	Being a responsible citizen, we have to develop habits that are environment friendly. What is the 3R principle we all should follow?
Answer» Being a responsible citizen, we have to develop habits that are environment friendly. What is the 3R principle we all should follow?

Discussion

579.	Why should not curd be kept in copper containers?
Answer» Why should not curd be kept in copper containers?

Discussion

580.	Which metal combines with chlorine to make table salt?
Answer» Which metal combines with chlorine to make table salt?

Discussion

581.	What are the causes of 'water pollution'? Discuss how you can contribute in reducing water pollution.
Answer» What are the causes of 'water pollution'? Discuss how you can contribute in reducing water pollution.

Discussion

582.	Why do food preparations become light and crisp when baking soda is used?
Answer» Why do food preparations become light and crisp when baking soda is used?

Discussion

583.	What is eutrophication? Why does it occur?
Answer» What is eutrophication? Why does it occur?

Discussion

584.	Explain significance of nitrogen for plants and animals.
Answer» Explain significance of nitrogen for plants and animals.

Discussion

585.	Find the volume of O2 required to burn 1 L of METHANE completely, measured at 0℃ temperature and 1 atm pressure.
Answer» Find the volume of O2 required to burn 1 L of METHANE completely, measured at 0℃ temperature and 1 atm pressure.

Discussion

586.	Classify bases on the basis of their strength.
Answer» Classify bases on the basis of their strength.

Discussion

587.	The ignition temperature of the petrol is ______oC.220
Answer» The ignition temperature of the petrol is ______ $^{o} C$ . 220

Discussion

588.	2.The electrostatic potential inside a charged spherical ball is given by phi=ar2+b where r is the distance from the centre ,a and b are constants.Then ,the charge density inside the ball is
Answer» 2.The electrostatic potential inside a charged spherical ball is given by phi=ar2+b where r is the distance from the centre ,a and b are constants.Then ,the charge density inside the ball is

Discussion

589.	How is the concentration of hydronium ions (H3O+) affected when a solution of an acid is diluted?
Answer» How is the concentration of hydronium ions ( $H_{3} O^{+}$ ) affected when a solution of an acid is diluted?

Discussion

590.	Why is rayon not considered a fully synthetic fibre?
Answer» Why is rayon not considered a fully synthetic fibre?

Discussion

591.	An unknown, clear liquid is given in a beaker. It is then transferred from the beaker to clean, empty test tube and heated. After a while, it is observed that vapours are rising from the test tube and soon all that's left are a few crystals of salt stuck to the edges. The liquid is ______________.
Answer» An unknown, clear liquid is given in a beaker. It is then transferred from the beaker to clean, empty test tube and heated. After a while, it is observed that vapours are rising from the test tube and soon all that's left are a few crystals of salt stuck to the edges. The liquid is ______________.

Discussion

592.	If the size of a nucleus (10e-15) is scaled upto the tip of a sharp pin (10e-5),then what roughly the size of the atom?
Answer» If the size of a nucleus (10e-15) is scaled upto the tip of a sharp pin (10e-5),then what roughly the size of the atom?

Discussion

593.	Question 31 Find out the names of three metals and three non-metals from the box given as Fig.
Answer» Question 31 Find out the names of three metals and three non-metals from the box given as Fig.

Discussion

594.	A. What is a neutralization reaction? Explain with an example.B. Define photochemical reaction and electrochemical reaction with an example.
Answer» A. What is a neutralization reaction? Explain with an example. B. Define photochemical reaction and electrochemical reaction with an example.

Discussion

595.	The maximum number of electrons that can be filled in the shell K, L, M, N respectively are _______________ respectively.
Answer» The maximum number of electrons that can be filled in the shell K, L, M, N respectively are _______________ respectively.

Discussion

596.	why is dispersed phase and dispersed medium called discontinuous phase and continuous phase respectively?
Answer» why is dispersed phase and dispersed medium called discontinuous phase and continuous phase respectively?

Discussion

597.	Metals can be obtained from metal oxide by ______ of metal oxide.
Answer» Metals can be obtained from metal oxide by ______ of metal oxide.

Discussion

598.	Which of the following metals on reacting with oxygen forms an amphoteric oxide?
Answer» Which of the following metals on reacting with oxygen forms an amphoteric oxide?

Discussion

599.	The temperature in a nuclear power plant is very high due to the fission reactions taking place. If the heat is not absorbed they may damage the reactors. Which among the following liquids is most suitable as coolant?
Answer» The temperature in a nuclear power plant is very high due to the fission reactions taking place. If the heat is not absorbed they may damage the reactors. Which among the following liquids is most suitable as coolant?

Discussion

600.	What are the four drawbacks of dalton atomic theory?
Answer» What are the four drawbacks of dalton atomic theory?

Discussion

Explore topic-wise InterviewSolutions in .

What is dry ice? Why is dry ice more dangerous than the normal ice cubes?

Time period of revolution of electron in the second orbit of singly ionised helium atom isaboutOptions:2 10-9 S2.5 x 10310 s4.2 x 10-14-16-12

Water contains hydrogen then why doesn't it burn?

18. describe STP and NTP concept in context of mole

64. The effective nuclear charge of an element with 3 valence electrons is 2.60. What is the atomic number of the element? D.-13.6 eV

According to Mosley, a straight line graph is obtained on plotting

Evaporation is a __ phenomenon.

The following figure shows irreversible change because,

What is h-atom abstraction ? Explain with proper diagram and explanation

The electron mobility in N-type germanium is 3900 cm2/v−s and its conductivity is 6.24 mho/cm; If the effect of cotters is negligible, then the impurity concentration will be

Temporary hardness of water can be removed by Clark's Method using:

nameing of hydrocarbon with complex sutitl

Synthetic fibres are strong, elastic, light, wrinkle-resistant, and easy to wash and dry. Even with so many advantages, we do not wear clothes made of pure synthetic fibres, but a mixture of synthetic and natural fibres. Why is this necessary?

Kinetic energy and potential energy (in eV) of electron present in second Bohr orbit of hydrogen atom are respectively (energy of first Bohr orbit=-13.6eV1. -13.6, -27.22. -1.51, -3.023. 3.4, -6.84. 3.02, -1.51

Define rapid combustion

Sunil went to a cloth shop. There he found a fabric which was smooth to touch, had vibrant colour and shine. The fabric could be ___.

Write any 3causes of green house effect

An iron tyre is to fitted on wooden wheel 1 m in diameter .the diameter of the is 6 mm is smaller than that of wheel . The tyre should be heated so that it's temp. Is increase by min. of (alpha for iron is 3.610-5)

Which is the element with the most metallic character?

Name one non metal which is liquid at room temperature

When a conservative force does positive work on a body, then the (1) Potential energy of body increases (2) Potential energy of body decreases (3) Total mechanical energy of body increases (4) Total mechanical energy of body decreases

Question 7Generally, metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals, except Mn and Mg?(a) H2SO4(b) HCl(c) HNO3(d) All of these

Boiling purifies water because:

The volume of water to be added to 50 cm3 of a 0.5 N HCl to get a decinormal solution is:

Give reason : Double displacement reaction takes place only in aqueous medium.

Question 43A non-metal X exists in two different forms Y and Z. Y is the hardest natural substance, whereas Z is a good conductor of electricity. Identify X, Y and Z.

Being a responsible citizen, we have to develop habits that are environment friendly. What is the 3R principle we all should follow?

Why should not curd be kept in copper containers?

Which metal combines with chlorine to make table salt?

What are the causes of 'water pollution'? Discuss how you can contribute in reducing water pollution.

Why do food preparations become light and crisp when baking soda is used?

What is eutrophication? Why does it occur?

Explain significance of nitrogen for plants and animals.

Find the volume of O2 required to burn 1 L of METHANE completely, measured at 0℃ temperature and 1 atm pressure.

Classify bases on the basis of their strength.

The ignition temperature of the petrol is ______oC.220

2.The electrostatic potential inside a charged spherical ball is given by phi=ar2+b where r is the distance from the centre ,a and b are constants.Then ,the charge density inside the ball is

How is the concentration of hydronium ions (H3O+) affected when a solution of an acid is diluted?

Why is rayon not considered a fully synthetic fibre?

An unknown, clear liquid is given in a beaker. It is then transferred from the beaker to clean, empty test tube and heated. After a while, it is observed that vapours are rising from the test tube and soon all that's left are a few crystals of salt stuck to the edges. The liquid is ______________.

If the size of a nucleus (10e-15) is scaled upto the tip of a sharp pin (10e-5),then what roughly the size of the atom?

Question 31 Find out the names of three metals and three non-metals from the box given as Fig.

A. What is a neutralization reaction? Explain with an example.B. Define photochemical reaction and electrochemical reaction with an example.

The maximum number of electrons that can be filled in the shell K, L, M, N respectively are _______________ respectively.

why is dispersed phase and dispersed medium called discontinuous phase and continuous phase respectively?

Metals can be obtained from metal oxide by ______ of metal oxide.

Which of the following metals on reacting with oxygen forms an amphoteric oxide?

The temperature in a nuclear power plant is very high due to the fission reactions taking place. If the heat is not absorbed they may damage the reactors. Which among the following liquids is most suitable as coolant?

What are the four drawbacks of dalton atomic theory?