7248 + Interview Questions in Chemistry Page 144 InterviewSolution

7151.	What kind of change is observed in the volume of matter on heating or cooling?
Answer» What kind of change is observed in the volume of matter on heating or cooling?

Discussion

7152.	What is flame ?where is it used ?
Answer» What is flame ?where is it used ?

Discussion

7153.	Why phosphorus is preserved in water?
Answer» Why phosphorus is preserved in water?

Discussion

7154.	Why a piece of chalk be broken easily into smaller pieces while a coal piece cannot be broken easily?
Answer» Why a piece of chalk be broken easily into smaller pieces while a coal piece cannot be broken easily?

Discussion

7155.	Name three water borne diseases.
Answer» Name three water borne diseases.

Discussion

7156.	A thermoplastic among the following is
Answer» A thermoplastic among the following is

Discussion

7157.	Which metal is more reactive : iron or zinc ?
Answer» Which metal is more reactive : iron or zinc ?

Discussion

7158.	What would you observe when a strip of zinc is placed in copper sulphate solution ? Write a word equation of the reaction which takes place.
Answer» What would you observe when a strip of zinc is placed in copper sulphate solution ? Write a word equation of the reaction which takes place.

Discussion

7159.	How does electricity pass through lime juice?
Answer» How does electricity pass through lime juice?

Discussion

7160.	Shamli took a piece of burning charcoal and collected the gas evolved in a test tube. The gas settled at the bottom of the test tube. Which of the following observations is correct?
Answer» Shamli took a piece of burning charcoal and collected the gas evolved in a test tube. The gas settled at the bottom of the test tube. Which of the following observations is correct?

Discussion

7161.	Which principle does pressure cooker use?
Answer» Which principle does pressure cooker use?

Discussion

7162.

Match the entries of column I with column II. Material Exception (a) Iodine (Non-metal) (i) Exists in liquid state (b) Diamond (Non-metal) (ii) Conducts electricity (c) Mercury (Metal) (iii) Lustrous (d) Graphite (Non-metal) (iv) Hardest natural substance

Answer»

Match the entries of column I with column II.

Material	Exception
(a) Iodine (Non-metal)	(i) Exists in liquid state
(b) Diamond (Non-metal)	(ii) Conducts electricity
(c) Mercury (Metal)	(iii) Lustrous
(d) Graphite (Non-metal)	(iv) Hardest natural substance

Discussion

7163.	The process by which large molecules of artificial fibres are made from small simple molecules is called __.
Answer» The process by which large molecules of artificial fibres are made from small simple molecules is called __.

Discussion

7164.	The manufacture of one of the following artificial fibres contributes to deforestation. This fibre is : (a) nylon (b) rayon (c) terylene (d) acrylic
Answer» The manufacture of one of the following artificial fibres contributes to deforestation. This fibre is : (a) nylon (b) rayon (c) terylene (d) acrylic

7164.

The manufacture of one of the following artificial fibres contributes to deforestation. This fibre is : (a) nylon (b) rayon (c) terylene (d) acrylic

Answer»

The manufacture of one of the following artificial fibres contributes to deforestation. This fibre is :

(a) nylon (b) rayon (c) terylene (d) acrylic

Discussion

7165.	Methane gas (CH4) when burns with oxygen (O2) gives carbon dioxide and water. Write the balanced chemical equation and provide the following information in terms of reactants and products in the equation. [5 Marks] (a) no. of molecules (b) no. of moles (c) molar mass (d) total mass of reactants and products What does statement (d) infer?
Answer» Methane gas $(C H_{4}$ ) when burns with oxygen $(O_{2}$ ) gives carbon dioxide and water. Write the balanced chemical equation and provide the following information in terms of reactants and products in the equation. [5 Marks] (a) no. of molecules (b) no. of moles (c) molar mass (d) total mass of reactants and products What does statement (d) infer?

Discussion

7166.	___ allotrope of carbon acts as a lubricant at high temperatures.
Answer» ___ allotrope of carbon acts as a lubricant at high temperatures.

Discussion

7167.	Malleability is the property of:
Answer» Malleability is the property of:

Discussion

7168.	what is galvanisation?Write its applications.
Answer» what is galvanisation?Write its applications.

Discussion

7169.	Liquid _________ is used along with liquid _________ to make rocket fuel.
Answer» Liquid _________ is used along with liquid _________ to make rocket fuel.

Discussion

7170.	Why can't the energy be destroyed?
Answer» Why can't the energy be destroyed?

Discussion

7171.	Why is acrylic blended with wool?
Answer» Why is acrylic blended with wool?

Discussion

7172.	On complete combustion of methane, we get a material that is
Answer» On complete combustion of methane, we get a material that is

Discussion

7173.	In the reaction Zn +2H+ +2Cl−⟶Zn+2+ 2Cl−+H2 the spectator ion Zn+2H++2Cl−−−−−−−−>Zn2++2Cl−+H2
Answer» In the reaction Zn +2 $H^{+}$ +2 $C l^{-}$ $⟶$ $Z n^{+} 2$ + 2 $C l^{-}$ + $H_{2}$ the spectator ion $Z n + 2 H^{+} + 2 C l^{-} - - - - - - - > Z n^{2 +} + 2 C l^{-} + H_{2}$

7173.

In the reaction Zn +2H+ +2Cl−⟶Zn+2+ 2Cl−+H2 the spectator ion Zn+2H++2Cl−−−−−−−−>Zn2++2Cl−+H2

Answer»

In the reaction Zn +2 $H^{+}$ +2 $C l^{-}$ $⟶$ $Z n^{+} 2$ + 2 $C l^{-}$ + $H_{2}$ the spectator ion

$Z n + 2 H^{+} + 2 C l^{-} - - - - - - - > Z n^{2 +} + 2 C l^{-} + H_{2}$

Discussion

7174.	What is the relative molecular mass of CuSO4.5H2O? Given the mass of Cu=63.5 amu
Answer» What is the relative molecular mass of $C u S O_{4} .5 H_{2} O$ ? Given the mass of $C u = 63.5 a m u$

Discussion

7175.	What is displacement reaction?
Answer» What is displacement reaction?

Discussion

7176.	The reaction between carbon and oxygen can be represented as
Answer» The reaction between carbon and oxygen can be represented as

Discussion

7177.	A popular metal X reacts with oxygen gas to give an amphoteric oxide. Identify the metal X. Recall that amphoteric oxides show both acidic and basic behaviour. X+O2→Amphoteric Oxide
Answer» A popular metal X reacts with oxygen gas to give an amphoteric oxide. Identify the metal X. Recall that amphoteric oxides show both acidic and basic behaviour. $X + O_{2} \to Amphoteric Oxide$

Discussion

7178.	Which of the following define the work most accurately? 1. Work is the product of displacement and component of force in the direction of displacement. 2. Work is the product of force and displacement. 3. Work is the product of force and component of displacement in the direction of force. 4. Work is the product of distance and force applied.
Answer» Which of the following define the work most accurately? 1. Work is the product of displacement and component of force in the direction of displacement. 2. Work is the product of force and displacement. 3. Work is the product of force and component of displacement in the direction of force. 4. Work is the product of distance and force applied.

Discussion

7179.	Which of the following is not combustible?
Answer» Which of the following is not combustible?

Discussion

7180.	'Avoid the use of plastics as far as possible.' Justify. [5 MARKS] .
Answer» 'Avoid the use of plastics as far as possible.' Justify. [5 MARKS] .

Discussion

7181.	Sam went to a shop to buy a saree for his mother's upcoming birthday. The shopkeeper showed him a saree which looked exactly like silk but said that it was artificial silk. Sam failed to understand the meaning of artificial silk. So please help sam by telling him what is artificial silk and why is it famous?
Answer» Sam went to a shop to buy a saree for his mother's upcoming birthday. The shopkeeper showed him a saree which looked exactly like silk but said that it was artificial silk. Sam failed to understand the meaning of artificial silk. So please help sam by telling him what is artificial silk and why is it famous?

Discussion

7182.	How is a spontaneous combustion different from a rapid combustion. Explain the difference in detail. [5 MARKS]
Answer» How is a spontaneous combustion different from a rapid combustion. Explain the difference in detail. [5 MARKS]

Discussion

7183.	NaHCO3 is the chemical formula of ___.
Answer» NaHCO₃ is the chemical formula of ___.

Discussion

7184.	Give two uses of coke. [2 MARKS]
Answer» Give two uses of coke. [2 MARKS]

Discussion

7185.	Nylon is
Answer» Nylon is

Discussion

7186.	Name a metal that replaces silver from silver nitrate solution
Answer» Name a metal that replaces silver from silver nitrate solution

Discussion

7187.	Number of valence electron in hydrogen atom is ___ .
Answer» Number of valence electron in hydrogen atom is ___ .

7187.

Number of valence electron in hydrogen atom is ___ .

Answer»

Number of valence electron in hydrogen atom is ___ .

Discussion

7188.	What will be the atomicity of: a) The gas that was taken inside the body during respiration and is released during photosynthesis. b) The red colored element which we use in matchsticks. c) The pale blue gas which forms a layer that absorbs the sun's UV radiation.
Answer» What will be the atomicity of: a) The gas that was taken inside the body during respiration and is released during photosynthesis. b) The red colored element which we use in matchsticks. c) The pale blue gas which forms a layer that absorbs the sun's UV radiation.

7188.

What will be the atomicity of: a) The gas that was taken inside the body during respiration and is released during photosynthesis. b) The red colored element which we use in matchsticks. c) The pale blue gas which forms a layer that absorbs the sun's UV radiation.

Answer»

What will be the atomicity of:

a) The gas that was taken inside the body during respiration and is released during photosynthesis.

b) The red colored element which we use in matchsticks.

c) The pale blue gas which forms a layer that absorbs the sun's UV radiation.

Discussion

7189.	Question 17 The underlined words in the following sentences have been jumbled up. Write them in their correct form. (a) Locais obtained from mines. (b) Umpetlore is a fossil fuel. (c) Rineryfe is a place where various fractions of petroleum are separated (d) Keenrose is a fuel used in jet crafts (e) Nutsgilh is an example of inexhaustible natural resources
Answer» Question 17 The underlined words in the following sentences have been jumbled up. Write them in their correct form. (a) Locais obtained from mines. (b) Umpetlore is a fossil fuel. (c) Rineryfe is a place where various fractions of petroleum are separated (d) Keenrose is a fuel used in jet crafts (e) Nutsgilh is an example of inexhaustible natural resources

Discussion

7190.	I know that if A is more reactive than B then- metal A + salt of metal B = metal B + salt of metal A What would happen if B is more reactive than A ? And how ?
Answer» I know that if A is more reactive than B then- metal A + salt of metal B = metal B + salt of metal A What would happen if B is more reactive than A ? And how ?

Discussion

7191.	Why do we consider hydrogen as the future of our energy requirements?
Answer» Why do we consider hydrogen as the future of our energy requirements?

Discussion

7192.	What would be the mass of oxygen atom on the planet Mars?
Answer» What would be the mass of oxygen atom on the planet Mars?

Discussion

7193.	What is brine?
Answer» What is brine?

Discussion

7194.	Middle zone of a candle falme burns with a yellow flame.
Answer» Middle zone of a candle falme burns with a yellow flame.

Discussion

7195.	In general, substances shrink on cooling and their volume decreases. This increases its:
Answer» In general, substances shrink on cooling and their volume decreases. This increases its:

Discussion

7196.	Give reason why water is a renuable natural resource
Answer» Give reason why water is a renuable natural resource

Discussion

7197.	how does a sodium carbonate extinguisher work? can it be used to put off electric fires?
Answer» how does a sodium carbonate extinguisher work? can it be used to put off electric fires?

Discussion

7198.	Name two gases present in polluted air which can cause acid rain.
Answer» Name two gases present in polluted air which can cause acid rain.

Discussion

7199.	The conversion of a substance from the liquid into the gaseous phase is called __________________.
Answer» The conversion of a substance from the liquid into the gaseous phase is called __________________.

Discussion

7200.	Which of the following properties describe a thermosetting polymer?
Answer» Which of the following properties describe a thermosetting polymer?

Discussion

Explore topic-wise InterviewSolutions in .

What kind of change is observed in the volume of matter on heating or cooling?

What is flame ?where is it used ?

Why phosphorus is preserved in water?

Why a piece of chalk be broken easily into smaller pieces while a coal piece cannot be broken easily?

Name three water borne diseases.

A thermoplastic among the following is

Which metal is more reactive : iron or zinc ?

What would you observe when a strip of zinc is placed in copper sulphate solution ? Write a word equation of the reaction which takes place.

How does electricity pass through lime juice?

Shamli took a piece of burning charcoal and collected the gas evolved in a test tube. The gas settled at the bottom of the test tube. Which of the following observations is correct?

Which principle does pressure cooker use?

Match the entries of column I with column II. Material Exception (a) Iodine (Non-metal) (i) Exists in liquid state (b) Diamond (Non-metal) (ii) Conducts electricity (c) Mercury (Metal) (iii) Lustrous (d) Graphite (Non-metal) (iv) Hardest natural substance

The process by which large molecules of artificial fibres are made from small simple molecules is called __.

The manufacture of one of the following artificial fibres contributes to deforestation. This fibre is : (a) nylon (b) rayon (c) terylene (d) acrylic

___ allotrope of carbon acts as a lubricant at high temperatures.

Malleability is the property of:

what is galvanisation?Write its applications.

Liquid _________ is used along with liquid _________ to make rocket fuel.

Why can't the energy be destroyed?

Why is acrylic blended with wool?

On complete combustion of methane, we get a material that is

In the reaction Zn +2H+ +2Cl−⟶Zn+2+ 2Cl−+H2 the spectator ion Zn+2H++2Cl−−−−−−−−&gt;Zn2++2Cl−+H2

What is the relative molecular mass of CuSO4.5H2O? Given the mass of Cu=63.5 amu

What is displacement reaction?

The reaction between carbon and oxygen can be represented as

A popular metal X reacts with oxygen gas to give an amphoteric oxide. Identify the metal X. Recall that amphoteric oxides show both acidic and basic behaviour. X+O2→Amphoteric Oxide

Which of the following is not combustible?

'Avoid the use of plastics as far as possible.' Justify. [5 MARKS] .

How is a spontaneous combustion different from a rapid combustion. Explain the difference in detail. [5 MARKS]

NaHCO3 is the chemical formula of ___.

Give two uses of coke. [2 MARKS]

Nylon is

Name a metal that replaces silver from silver nitrate solution

Number of valence electron in hydrogen atom is ___ .

What will be the atomicity of: a) The gas that was taken inside the body during respiration and is released during photosynthesis. b) The red colored element which we use in matchsticks. c) The pale blue gas which forms a layer that absorbs the sun's UV radiation.

I know that if A is more reactive than B then- metal A + salt of metal B = metal B + salt of metal A What would happen if B is more reactive than A ? And how ? ​

Why do we consider hydrogen as the future of our energy requirements?

What would be the mass of oxygen atom on the planet Mars?

What is brine?

Middle zone of a candle falme burns with a yellow flame.

In general, substances shrink on cooling and their volume decreases. This increases its:

Give reason why water is a renuable natural resource

how does a sodium carbonate extinguisher work? can it be used to put off electric fires?

Name two gases present in polluted air which can cause acid rain.

The conversion of a substance from the liquid into the gaseous phase is called __________________.

Which of the following properties describe a thermosetting polymer?

Liquid _ is used along with liquid _ to make rocket fuel.

In the reaction Zn +2H+ +2Cl−⟶Zn+2+ 2Cl−+H2 the spectator ion Zn+2H++2Cl−−−−−−−−>Zn2++2Cl−+H2

I know that if A is more reactive than B then- metal A + salt of metal B = metal B + salt of metal A What would happen if B is more reactive than A ? And how ?