7248 + Interview Questions in Chemistry Page 71 InterviewSolution

3501.	What kind of change is shown by tearing of paper?
Answer» What kind of change is shown by tearing of paper?

Discussion

3502.	What is the atomicity of ozone?
Answer» What is the atomicity of ozone?

Discussion

3503.	Identify the Arrhenius acids among the following:1. NaCl 2. HCl 3. Cu(OH)2 4. NaOH 5. H2SO4 6. HNO3 7. KOH
Answer» Identify the Arrhenius acids among the following: 1. NaCl 2. HCl 3. $C u (O H)_{2}$ 4. NaOH 5. $H_{2} S O_{4}$ 6. $H N O_{3}$ 7. KOH

3503.

Identify the Arrhenius acids among the following:1. NaCl 2. HCl 3. Cu(OH)2 4. NaOH 5. H2SO4 6. HNO3 7. KOH

Answer»

Identify the Arrhenius acids among the following:

1. NaCl 2. HCl 3. $C u (O H)_{2}$ 4. NaOH

5. $H_{2} S O_{4}$ 6. $H N O_{3}$ 7. KOH

Discussion

3504.	(a^2b^3c)^4 (abc)^3÷(a^3bc^-1)^2=√a^mb^nc^p then m+n+p=?
Answer» (a^2b^3c)^4 (abc)^3÷(a^3bc^-1)^2=√a^mb^nc^p then m+n+p=?

Discussion

3505.	A radioactiveA nucleus of initial mass number A and atomic number Z emits 2α particles, 2β- particles and 3 positron. The number of neutrons in the final nucleus will be
Answer» A radioactiveA nucleus of initial mass number A and atomic number Z emits 2α particles, 2β- particles and 3 positron. The number of neutrons in the final nucleus will be

Discussion

3506.	Which of the following reaction will not occur?
Answer» Which of the following reaction will not occur?

Discussion

3507.	Students of a school had gone for an overnight camp. They gathered some wood and wanted to light a fire. They tried to light the fire with a matchstick but the wood would not catch fire. Someone suggested pouring kerosene over the wood, but no kerosene was available. Someone else suggested setting dry leaves on fire first with the matchstick and using it to light the wood. But they could not find any dry leaves.Then Tanya brought a bottle of Vaseline(petroleum jelly) that she had brought with her to apply on her skin. She smeared it over a piece of cloth and set it on fire. She used it to light the wood.Answer these questions.1. Why could the wood not be set on fire by the matchstick?2.How would kerosene have helped?3.Why were dry leaves suggested and not green leaves?4.Which two properties of petroleum jelly were used to light the fire?
Answer» Students of a school had gone for an overnight camp. They gathered some wood and wanted to light a fire. They tried to light the fire with a matchstick but the wood would not catch fire. Someone suggested pouring kerosene over the wood, but no kerosene was available. Someone else suggested setting dry leaves on fire first with the matchstick and using it to light the wood. But they could not find any dry leaves. Then Tanya brought a bottle of Vaseline(petroleum jelly) that she had brought with her to apply on her skin. She smeared it over a piece of cloth and set it on fire. She used it to light the wood. Answer these questions. 1. Why could the wood not be set on fire by the matchstick? 2.How would kerosene have helped? 3.Why were dry leaves suggested and not green leaves? 4.Which two properties of petroleum jelly were used to light the fire?

Discussion

3508.	In Figure you find that the bulb glows when an iron nail is placed between two ends of the wire. Complete the following sentences on the basis of this fact. (a) __________is a metal.(b) Metals are good_________ of electricity.
Answer» In Figure you find that the bulb glows when an iron nail is placed between two ends of the wire. Complete the following sentences on the basis of this fact. (a) __________is a metal. (b) Metals are good_________ of electricity.

Discussion

3509.	Oxides responsible for acid rain is/are :-
Answer» Oxides responsible for acid rain is/are :-

Discussion

3510.	Hydrogen chloride is a ___ made of H+ and Cl- which are ___ and ___ respectively.
Answer» Hydrogen chloride is a ___ made of H⁺ and Cl^- which are ___ and ___ respectively.

Discussion

3511.	Ammonia isin nature since it turns red litmus blue.
Answer» Ammonia isin nature since it turns red litmus blue.

Discussion

3512.	2. Find the relationship between:- (a) Molality and molarity (b) Molality and mole fraction (c) Molarity and mole fraction
Answer» 2. Find the relationship between:- (a) Molality and molarity (b) Molality and mole fraction (c) Molarity and mole fraction

Discussion

3513.	The incorrect order of atomic radius for the following elements is ______________.
Answer» The incorrect order of atomic radius for the following elements is ______________.

Discussion

3514.	The bad smelling substance formed by the action of alcoholic caustic potash on chloroform and aniline is?
Answer» The bad smelling substance formed by the action of alcoholic caustic potash on chloroform and aniline is?

Discussion

3515.	volume of gas evolved at anode when CuSO4(aq.) is electrolyzed by using 2F electricity at STP will be?
Answer» volume of gas evolved at anode when CuSO4(aq.) is electrolyzed by using 2F electricity at STP will be?

Discussion

3516.	Is bakelite recyclable?
Answer» Is bakelite recyclable?

Discussion

3517.	What kind of energy is possessed by the motion of the planet?
Answer» What kind of energy is possessed by the motion of the planet?

Discussion

3518.	Na−1electron−−−−−−−→Na+ Unstable sodium atom is converted to stable sodium ion. The formation of sodium ion describes the concept of______________.
Answer» $N a - 1 e l e c t r o n - ------ \to N a^{+}$ Unstable sodium atom is converted to stable sodium ion. The formation of sodium ion describes the concept of______________.

Discussion

3519.	Explain to me the juggler's problem
Answer» Explain to me the juggler's problem

Discussion

3520.	How to determine the valency of an element?
Answer» How to determine the valency of an element?

Discussion

3521.	Which one of the following elements has the least ionisation energy?
Answer» Which one of the following elements has the least ionisation energy?

Discussion

3522.	Fill in the banks. (a) Fossilfuels are ________,________and _________.(b) Process of separation of differentconstituents from petroleum is called _________.(c) Leastpolluting fuel for vehicles is __________.
Answer» Fill in the banks. (a) Fossil fuels are ________, ________ and _________. (b) Process of separation of different constituents from petroleum is called _________. (c) Least polluting fuel for vehicles is __________.

3522.

Fill in the banks. (a) Fossilfuels are ____,and _.(b) Process of separation of differentconstituents from petroleum is called _.(c) Leastpolluting fuel for vehicles is ______.

Answer»

Fill in the banks.

(a) Fossil
fuels are ________,
________
and _________.

(b) Process of separation of different
constituents from petroleum is called _________.

(c) Least
polluting fuel for vehicles is __________.

Discussion

3523.	How is this possible that ionic compounds in the solid state do not conduct electricity and they do so in the molten state? [2 MARKS]
Answer» How is this possible that ionic compounds in the solid state do not conduct electricity and they do so in the molten state? [2 MARKS]

Discussion

3524.	Give some examples of artificial fertilizer
Answer» Give some examples of artificial fertilizer

Discussion

3525.	Four set ups as given here were arranged to identify the gas evolved when dilute sulphuric acid was added to zinc granules.The most appropriate set up is : (1) I(2) II(3) III(4) IV
Answer» Four set ups as given here were arranged to identify the gas evolved when dilute sulphuric acid was added to zinc granules.The most appropriate set up is : (1) I (2) II (3) III (4) IV

Discussion

3526.	According to the Rutherford’s atomic model, the electrons inside the atom are
Answer» According to the Rutherford’s atomic model, the electrons inside the atom are

Discussion

3527.	How much volume of 0.5N Na2CO3 must be added to remove hardness of 1L water containing 1.11 g CaCO3.
Answer» How much volume of 0.5N Na2CO3 must be added to remove hardness of 1L water containing 1.11 g CaCO3.

Discussion

3528.	State whether true or false and give reasons why : The less stable compound has the more negative heat of combustion.
Answer» State whether true or false and give reasons why : The less stable compound has the more negative heat of combustion.

Discussion

3529.	Protons, Neutron, Electron can be further divided into what????
Answer» Protons, Neutron, Electron can be further divided into what????

Discussion

3530.	A researcher wants an alarm to sound when the temperature of air in his controlled research chamber rises above 40°C or falls below 20°C. The alarm can be triggered by the output of a (a) NOT gate (c) NAND gate(b) AND gate(d) OR gate
Answer» A researcher wants an alarm to sound when the temperature of air in his controlled research chamber rises above 40°C or falls below 20°C. The alarm can be triggered by the output of a (a) NOT gate (c) NAND gate (b) AND gate (d) OR gate

Discussion

3531.	Since coal is a fossil fuel, the main source of coal is:
Answer» Since coal is a fossil fuel, the main source of coal is:

Discussion

3532.	What is the experiment based on which Rutherford explained the structure of an atom?
Answer» What is the experiment based on which Rutherford explained the structure of an atom?

Discussion

3533.	What does glue contain?
Answer» What does glue contain?

Discussion

3534.	In hydrogen atom an electron like particle with charge=2e- and same mass as electron is revolvong around nucleus considering bohr model to be applicable find the radius of 1st bohr orbit of such hydrogen atom ?
Answer» In hydrogen atom an electron like particle with charge=2e- and same mass as electron is revolvong around nucleus considering bohr model to be applicable find the radius of 1st bohr orbit of such hydrogen atom ?

Discussion

3535.	Mechanism of oxidation of primary alcohols
Answer» Mechanism of oxidation of primary alcohols

Discussion

3536.	Question 38Compute the number of ions present in 5.85 g of sodium chloride.
Answer» Question 38 Compute the number of ions present in 5.85 g of sodium chloride.

Discussion

3537.	14. When an air bubble of radius rrises from the bottom to the surfaceof a lake, its radius becomes 5r/4.Pressure of the atmosphere is equalto the 10 m height of water column.If the temperature is constant andthe surface tension is neglected, thedepth of the lake is
Answer» 14. When an air bubble of radius rrises from the bottom to the surfaceof a lake, its radius becomes 5r/4.Pressure of the atmosphere is equalto the 10 m height of water column.If the temperature is constant andthe surface tension is neglected, thedepth of the lake is

Discussion

3538.	Metals that melt in hand are:
Answer» Metals that melt in hand are:

Discussion

3539.	(a) If you have to choose between two thin blankets and a thick blanket on a cold winter night, which one will you choose? (b) Stainless steel pans are usually provided with copper bottoms. Why? (c) You may have noticed that a few sharp jerks are given to a clinical thermometer before using it. Why is it done so?
Answer» (a) If you have to choose between two thin blankets and a thick blanket on a cold winter night, which one will you choose? (b) Stainless steel pans are usually provided with copper bottoms. Why? (c) You may have noticed that a few sharp jerks are given to a clinical thermometer before using it. Why is it done so?

Discussion

3540.	During crystallisation, the clear solution obtained after filtration is heated till:
Answer» During crystallisation, the clear solution obtained after filtration is heated till:

Discussion

3541.	59.Highest boiling point H2O or D2O
Answer» 59.Highest boiling point H2O or D2O

Discussion

3542.	28. If we considered that 1/6 in place of 1/12 mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole substance will 1) becomes twice 2) becomes half 3) remains same 4) none of these
Answer» 28. If we considered that 1/6 in place of 1/12 mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole substance will 1) becomes twice 2) becomes half 3) remains same 4) none of these

Discussion

3543.	List two advantages of the use of unleaded petrol in automobiles as fuel. [1]
Answer» List two advantages of the use of unleaded petrol in automobiles as fuel. [1]

Discussion

3544.	What is oxidation?
Answer» What is oxidation?

Discussion

3545.	What exactly is calcium hydroxide cement and why do dentists use it?
Answer» What exactly is calcium hydroxide cement and why do dentists use it?

Discussion

3546.	Answer the following questions. (a) Why is it possible to draw silver into a wire when even a long pencil-point breaks so easily? (b) Why is copper used for electrical wiring in our houses? (c) Why does a copper vessel shine again after scrubbing? (d) Give two characteristics of alloys. (e) What is meant by corrosion?
Answer» Answer the following questions. (a) Why is it possible to draw silver into a wire when even a long pencil-point breaks so easily? (b) Why is copper used for electrical wiring in our houses? (c) Why does a copper vessel shine again after scrubbing? (d) Give two characteristics of alloys. (e) What is meant by corrosion?

3546.

Answer the following questions. (a) Why is it possible to draw silver into a wire when even a long pencil-point breaks so easily? (b) Why is copper used for electrical wiring in our houses? (c) Why does a copper vessel shine again after scrubbing? (d) Give two characteristics of alloys. (e) What is meant by corrosion?

Answer»

Answer the following questions.

(a) Why is it possible to draw silver into a wire when even a long pencil-point breaks so easily?

(b) Why is copper used for electrical wiring in our houses?

(c) Why does a copper vessel shine again after scrubbing?

(d) Give two characteristics of alloys.

(e) What is meant by corrosion?

Discussion

3547.	Question 13Match the terms of column A correctly with the phrases given in column B. A B(i)Polyester(a)Prepared by using wood pulp(ii)Teflon(b)Used for making parachutes and stockings(iii)Rayon(c)Used to make non−stick cookware(iv)Nylon(d)Fabrics do not wrinkle easily
Answer» Question 13 Match the terms of column A correctly with the phrases given in column B. $\begin{matrix} A & B (i) & P o l y e s t e r & (a) & P r e p a r e d b y u s i n g w o o d p u l p (i i) & T e f l o n & (b) & U s e d f o r m a k i n g p a r a c h u t e s a n d s t o c k i n g s (i i i) & R a y o n & (c) & U s e d t o m a k e n o n - s t i c k c o o k w a r e (i v) & N y l o n & (d) & F a b r i c s d o n o t w r i n k l e e a s i l y \end{matrix}$

3547.

Question 13Match the terms of column A correctly with the phrases given in column B. A B(i)Polyester(a)Prepared by using wood pulp(ii)Teflon(b)Used for making parachutes and stockings(iii)Rayon(c)Used to make non−stick cookware(iv)Nylon(d)Fabrics do not wrinkle easily

Answer»

Question 13

Match the terms of column A correctly with the phrases given in column B.

$\begin{matrix} A & B (i) & P o l y e s t e r & (a) & P r e p a r e d b y u s i n g w o o d p u l p (i i) & T e f l o n & (b) & U s e d f o r m a k i n g p a r a c h u t e s a n d s t o c k i n g s (i i i) & R a y o n & (c) & U s e d t o m a k e n o n - s t i c k c o o k w a r e (i v) & N y l o n & (d) & F a b r i c s d o n o t w r i n k l e e a s i l y \end{matrix}$

Discussion

3548.	Why is iron sulphide a compound ?
Answer» Why is iron sulphide a compound ?

Discussion

3549.	How a molecule have both ionic and covalent bond
Answer» How a molecule have both ionic and covalent bond

Discussion

3550.	what is anti-knocking agent? what is octane number ?
Answer» what is anti-knocking agent? what is octane number ?

Discussion

Explore topic-wise InterviewSolutions in .

What kind of change is shown by tearing of paper?

What is the atomicity of ozone?

Identify the Arrhenius acids among the following:1. NaCl 2. HCl 3. Cu(OH)2 4. NaOH 5. H2SO4 6. HNO3 7. KOH

(a^2b^3c)^4 (abc)^3÷(a^3bc^-1)^2=√a^mb^nc^p then m+n+p=?

A radioactiveA nucleus of initial mass number A and atomic number Z emits 2α particles, 2β- particles and 3 positron. The number of neutrons in the final nucleus will be

Which of the following reaction will not occur?

In Figure you find that the bulb glows when an iron nail is placed between two ends of the wire. Complete the following sentences on the basis of this fact. ​(a) __________is a metal.​(b) Metals are good_________ of electricity.​

Oxides responsible for acid rain is/are :-

Hydrogen chloride is a ___ made of H+ and Cl- which are ___ and ___ respectively.

Ammonia isin nature since it turns red litmus blue.

2. Find the relationship between:- (a) Molality and molarity (b) Molality and mole fraction (c) Molarity and mole fraction

The incorrect order of atomic radius for the following elements is ______________.

The bad smelling substance formed by the action of alcoholic caustic potash on chloroform and aniline is?

volume of gas evolved at anode when CuSO4(aq.) is electrolyzed by using 2F electricity at STP will be?

Is bakelite recyclable?

What kind of energy is possessed by the motion of the planet?

Na−1electron−−−−−−−→Na+ Unstable sodium atom is converted to stable sodium ion. The formation of sodium ion describes the concept of______________.

Explain to me the juggler's problem

How to determine the valency of an element?

Which one of the following elements has the least ionisation energy?

Fill in the banks. (a) Fossilfuels are ________,________and _________.(b) Process of separation of differentconstituents from petroleum is called _________.(c) Leastpolluting fuel for vehicles is __________.

How is this possible that ionic compounds in the solid state do not conduct electricity and they do so in the molten state? [2 MARKS]

Give some examples of artificial fertilizer

Four set ups as given here were arranged to identify the gas evolved when dilute sulphuric acid was added to zinc granules.The most appropriate set up is : (1) I(2) II(3) III(4) IV

According to the Rutherford’s atomic model, the electrons inside the atom are

How much volume of 0.5N Na2CO3 must be added to remove hardness of 1L water containing 1.11 g CaCO3.

State whether true or false and give reasons why : The less stable compound has the more negative heat of combustion.

Protons, Neutron, Electron can be further divided into what????

A researcher wants an alarm to sound when the temperature of air in his controlled research chamber rises above 40°C or falls below 20°C. The alarm can be triggered by the output of a (a) NOT gate (c) NAND gate(b) AND gate(d) OR gate

Since coal is a fossil fuel, the main source of coal is:

What is the experiment based on which Rutherford explained the structure of an atom?

What does glue contain?

In hydrogen atom an electron like particle with charge=2e- and same mass as electron is revolvong around nucleus considering bohr model to be applicable find the radius of 1st bohr orbit of such hydrogen atom ?

Mechanism of oxidation of primary alcohols

Question 38Compute the number of ions present in 5.85 g of sodium chloride.

14. When an air bubble of radius rrises from the bottom to the surfaceof a lake, its radius becomes 5r/4.Pressure of the atmosphere is equalto the 10 m height of water column.If the temperature is constant andthe surface tension is neglected, thedepth of the lake is

Metals that melt in hand are:

During crystallisation, the clear solution obtained after filtration is heated till:

59.Highest boiling point H2O or D2O

28. If we considered that 1/6 in place of 1/12 mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole substance will 1) becomes twice 2) becomes half 3) remains same 4) none of these

List two advantages of the use of unleaded petrol in automobiles as fuel. [1]

What is oxidation?

What exactly is calcium hydroxide cement and why do dentists use it?

Question 13Match the terms of column A correctly with the phrases given in column B. A B(i)Polyester(a)Prepared by using wood pulp(ii)Teflon(b)Used for making parachutes and stockings(iii)Rayon(c)Used to make non−stick cookware(iv)Nylon(d)Fabrics do not wrinkle easily

Why is iron sulphide a compound ?

How a molecule have both ionic and covalent bond

what is anti-knocking agent? what is octane number ?

In Figure you find that the bulb glows when an iron nail is placed between two ends of the wire. Complete the following sentences on the basis of this fact. (a) __is a metal.(b) Metals are good_ of electricity.

Hydrogen chloride is a _ made of H+ and Cl- which are _ and ___ respectively.

Fill in the banks. (a) Fossilfuels are ____,and _.(b) Process of separation of differentconstituents from petroleum is called _.(c) Leastpolluting fuel for vehicles is ______.