7248 + Interview Questions in Chemistry Page 20 InterviewSolution

951.	Balance the following equations : (a) N2+H2→NH3 (b) H2+O2→H2O (c) Na2O+H2O→NaOH (d) CO+O2→CO2 (e) Zn+HCI→ZnCl2+H2
Answer» Balance the following equations : (a) $N_{2} + H_{2} \to N H_{3}$ (b) $H_{2} + O_{2} \to H_{2} O$ (c) $N a_{2} O + H_{2} O \to N a O H$ (d) $C O + O_{2} \to C O_{2}$ (e) $Z n + H C I \to Z n C l_{2} + H_{2}$

951.

Balance the following equations : (a) N2+H2→NH3 (b) H2+O2→H2O (c) Na2O+H2O→NaOH (d) CO+O2→CO2 (e) Zn+HCI→ZnCl2+H2

Answer»

Balance the following equations :

(a) $N_{2} + H_{2} \to N H_{3}$

(b) $H_{2} + O_{2} \to H_{2} O$

(c) $N a_{2} O + H_{2} O \to N a O H$

(d) $C O + O_{2} \to C O_{2}$

(e) $Z n + H C I \to Z n C l_{2} + H_{2}$

Discussion

952.	Question 10The material which is commonly used for making kitchen containers is(a) PVC(b) Acrylic(c) Teflon(d) PET
Answer» Question 10 The material which is commonly used for making kitchen containers is (a) PVC (b) Acrylic (c) Teflon (d) PET

Discussion

953.	Which among the following is worst conductor of heat
Answer» Which among the following is worst conductor of heat

Discussion

954.	Explain breifly that why Non-biodegradable waste is harmful to the environment? Give suitable examples.
Answer» Explain breifly that why Non-biodegradable waste is harmful to the environment? Give suitable examples.

Discussion

955.	In a large tank of cross-sectional area A, there is a small hole of area ‘a’ at the bottom. The time taken to emptying the tank from height h1 to h2 is
Answer» In a large tank of cross-sectional area A, there is a small hole of area ‘a’ at the bottom. The time taken to emptying the tank from height h1 to h2 is

Discussion

956.	Why should we consume fossil fuel at a slower rate?
Answer» Why should we consume fossil fuel at a slower rate?

Discussion

957.	Gravitational potential energy U = mass × force of gravity on unit mass × ___
Answer» Gravitational potential energy U = mass $\times$ force of gravity on unit mass $\times$ ___

Discussion

958.	Which of the following statements are “true”?(a) Water vapour is present in air only during the monsoon. (b) Water evaporates into air from oceans, rivers and lakes but not from the soil.(c) The process of water changing into its vapour, is called evaporation.(d) The evaporation of water takes place only in sunlight.(e) Water vapour condenses to form tiny droplets of water in the upper layers of air where it is cooler.
Answer» Which of the following statements are “true”? (a) Water vapour is present in air only during the monsoon. (b) Water evaporates into air from oceans, rivers and lakes but not from the soil. (c) The process of water changing into its vapour, is called evaporation. (d) The evaporation of water takes place only in sunlight. (e) Water vapour condenses to form tiny droplets of water in the upper layers of air where it is cooler.

Discussion

959.	a) Convert the following temperature to the Celsius scale.(i) 293 K (ii) 470 Kb) Why can you smell the perfume of incense stick ?c) Why does the temperature of a substance remain constant during its melting point or boiling point?d) Which amongst the following is not matter?(i). Brick(ii) Pen(iii) TimeGive reason.
Answer» a) Convert the following temperature to the Celsius scale. (i) 293 K (ii) 470 K b) Why can you smell the perfume of incense stick ? c) Why does the temperature of a substance remain constant during its melting point or boiling point? d) Which amongst the following is not matter? (i). Brick (ii) Pen (iii) Time Give reason.

959.

a) Convert the following temperature to the Celsius scale.(i) 293 K (ii) 470 Kb) Why can you smell the perfume of incense stick ?c) Why does the temperature of a substance remain constant during its melting point or boiling point?d) Which amongst the following is not matter?(i). Brick(ii) Pen(iii) TimeGive reason.

Answer»

a) Convert the following temperature to the Celsius scale.

(i) 293 K (ii) 470 K

b) Why can you smell the perfume of incense stick ?

c) Why does the temperature of a substance remain constant during its melting point or boiling point?

d) Which amongst the following is not matter?

(i). Brick

(ii) Pen

(iii) Time

Give reason.

Discussion

960.	Word chemical reaction between magnesium and hydrochloric acid
Answer» Word chemical reaction between magnesium and hydrochloric acid

Discussion

961.	Question 13The first model of an atom was given by(a) N. Bohr(b) E. Goldstein(c) Rutherford(d) J.J. Thomson
Answer» Question 13 The first model of an atom was given by (a) N. Bohr (b) E. Goldstein (c) Rutherford (d) J.J. Thomson

Discussion

962.	Why should the foodstuffs like orange juice,pickles,chutney and curd not be kept in iron or aluminium containers ?
Answer» Why should the foodstuffs like orange juice,pickles,chutney and curd not be kept in iron or aluminium containers ?

Discussion

963.	A cotton shirt, before it reaches you, completes a long journey. Elaborate on this journey starting from cotton bolls.
Answer» A cotton shirt, before it reaches you, completes a long journey. Elaborate on this journey starting from cotton bolls.

Discussion

964.	You are given a solution of iron sulphate. Which of the following do you think cannot displace iron from iron sulphate ? (a) magnesium (b) calcium (c) copper (d) zinc
Answer» You are given a solution of iron sulphate. Which of the following do you think cannot displace iron from iron sulphate ? (a) magnesium (b) calcium (c) copper (d) zinc

964.

You are given a solution of iron sulphate. Which of the following do you think cannot displace iron from iron sulphate ? (a) magnesium (b) calcium (c) copper (d) zinc

Answer»

You are given a solution of iron sulphate. Which of the following do you think cannot displace iron from iron sulphate ?

(a) magnesium

(b) calcium

(c) copper

(d) zinc

Discussion

965.	Which of the following characteristics is associated with gaseous state?
Answer» Which of the following characteristics is associated with gaseous state?

Discussion

966.	Question 10 (a)Saloni took a piece of burning charcoal and collected the gas evolved in a test tube.(a) How will she find the nature of the gas?
Answer» Question 10 (a) Saloni took a piece of burning charcoal and collected the gas evolved in a test tube. (a) How will she find the nature of the gas?

Discussion

967.	Which among the following elements possess the properties of hardness, malleability and ductility with?
Answer» Which among the following elements possess the properties of hardness, malleability and ductility with?

Discussion

968.	Oxides of nitrogen and sulphur causes ______ rain when reacted with water vapour present in atmosphere.
Answer» Oxides of nitrogen and sulphur causes ______ rain when reacted with water vapour present in atmosphere.

Discussion

969.	Explain the difference between thermoplastic and thermosetting plastics.
Answer» Explain the difference between thermoplastic and thermosetting plastics.

Discussion

970.	A frontend loader applies a force of 150 N to lift a stone such that 2250 J of work is done. Find the displacement of the rock due to this force.
Answer» A frontend loader applies a force of 150 N to lift a stone such that 2250 J of work is done. Find the displacement of the rock due to this force.

Discussion

971.	Give reason: Aluminium is used for wrapping food items. Metals are used in ringing bells. Phosphorus is stored in the water.
Answer» Give reason: Aluminium is used for wrapping food items. Metals are used in ringing bells. Phosphorus is stored in the water.

971.

Give reason: Aluminium is used for wrapping food items. Metals are used in ringing bells. Phosphorus is stored in the water.

Answer»

Give reason:

Aluminium is used for wrapping food items.

Metals are used in ringing bells.

Phosphorus is stored in the water.

Discussion

972.	When blue litmus paper was dipped into the water, the colour of litmus paper remained the same. Similarly, when red litmus paper was dipped into water, the colour remained the same. By above observation we can concluded that:
Answer» When blue litmus paper was dipped into the water, the colour of litmus paper remained the same. Similarly, when red litmus paper was dipped into water, the colour remained the same. By above observation we can concluded that:

Discussion

973.	we know that metals are sonorus but wood also produces some sound then wood is metal or not
Answer» we know that metals are sonorus but wood also produces some sound then wood is metal or not

Discussion

974.	(i) What is Brownian motion? Draw a diagram to show the movement of a particle (like a pollen grain) during Brownian motion.(ii) In a beam of sunlight entering a room, we can sometimes see dust particles moving in a haphazard way in the air. Why do these dust particles move?
Answer» (i) What is Brownian motion? Draw a diagram to show the movement of a particle (like a pollen grain) during Brownian motion. (ii) In a beam of sunlight entering a room, we can sometimes see dust particles moving in a haphazard way in the air. Why do these dust particles move?

Discussion

975.	Water gas contains :
Answer» Water gas contains :

Discussion

976.	one gram of silver gets distributed between 10cm^3 of molten zink and 100cm^3 of molten lead of 800^° c . the percentage of silver in the zink layer is approximatel
Answer» one gram of silver gets distributed between 10cm^3 of molten zink and 100cm^3 of molten lead of 800^° c . the percentage of silver in the zink layer is approximatel

Discussion

977.	5. The percentage composition of a solution is as follows 20percent urea,40percent glucose and 40percent water calculate the mole fraction of each component?
Answer» 5. The percentage composition of a solution is as follows 20percent urea,40percent glucose and 40percent water calculate the mole fraction of each component?

Discussion

978.	Of the group 18 elements, __ is the most abundant in the Earth’s crust.
Answer» Of the group 18 elements, __ is the most abundant in the Earth’s crust.

Discussion

979.	Tears help our eyes by
Answer» Tears help our eyes by

Discussion

980.	Consider the following reaction. CaCO3(s) + H2O(l) + CO2(g) → Ca(HCO3)2(aq) Element Number of atoms present Reactant sideProduct sideCalcium11Carbon2YOxygenX6Hydrogen22 Recognise X and Y. The value of X + Y is___.
Answer» Consider the following reaction. $C a C O_{3} (s)$ + $H_{2} O (l)$ + $C O_{2} (g)$ $\to$ $C a (H C O_{3})_{2} (a q)$ $\begin{matrix} Element & Number of atoms present \end{matrix}$ $\begin{matrix} Reactant side & Product side Calcium & 1 & 1 Carbon & 2 & Y Oxygen & X & 6 Hydrogen & 2 & 2 \end{matrix}$ Recognise $X$ and $Y$ . The value of $X + Y$ is___.

Discussion

981.	Does atoms and molecules really exist or, is it just our hypothesis?
Answer» Does atoms and molecules really exist or, is it just our hypothesis?

Discussion

982.	We do not clean ponds or lakes, but an aquarium needs to be cleaned. Why?
Answer» We do not clean ponds or lakes, but an aquarium needs to be cleaned. Why?

Discussion

983.	Mention few example of exothermic reactions.
Answer» Mention few example of exothermic reactions.

Discussion

984.	What is meant by collid ? Why do we call milk as collid? Explain.
Answer» What is meant by collid ? Why do we call milk as collid? Explain.

Discussion

985.	what is antiseptic and disinfectants?
Answer» what is antiseptic and disinfectants?

Discussion

986.	What is the percentage composition of iron in ferric sulphate, given mass of iron is 56 amu?
Answer» What is the percentage composition of iron in ferric sulphate, given mass of iron is 56 amu?

Discussion

987.	Which of the following are properties of an amorphous solid?
Answer» Which of the following are properties of an amorphous solid?

Discussion

988.	The oxygen dissociation curve shifts to the right when
Answer» The oxygen dissociation curve shifts to the right when

Discussion

989.	Question 11One day Reeta went to a jeweller’s shop with her mother. Her mother gave old gold jewellery to the goldsmith to polish. Next day when they brought the jewellery back, they found that there was a slight loss in its weight. Can you suggest a reason for the loss in weight?
Answer» Question 11 One day Reeta went to a jeweller’s shop with her mother. Her mother gave old gold jewellery to the goldsmith to polish. Next day when they brought the jewellery back, they found that there was a slight loss in its weight. Can you suggest a reason for the loss in weight?

Discussion

990.	Consider the following chemical equation for the combustion of methane (CH4)CH4+2O2→CO2+2H2O
Answer» Consider the following chemical equation for the combustion of methane ( $C H_{4}$ ) $C H_{4} + 2 O_{2} \to C O_{2} + 2 H_{2} O$

990.

Consider the following chemical equation for the combustion of methane (CH4)CH4+2O2→CO2+2H2O

Answer»

Consider the following chemical equation for the combustion of methane ( $C H_{4}$ )

$C H_{4} + 2 O_{2} \to C O_{2} + 2 H_{2} O$

Discussion

991.	Your farewell is approaching. You go to the mall to get a nice dress for yourself. You found one pretty dress which was very soft, gave a good look, didn't need any ironing also and it was easy to wash. What could be the dress made up of?
Answer» Your farewell is approaching. You go to the mall to get a nice dress for yourself. You found one pretty dress which was very soft, gave a good look, didn't need any ironing also and it was easy to wash. What could be the dress made up of?

Discussion

992.	PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Can you write the major difference between these two types of plastics?
Answer» PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Can you write the major difference between these two types of plastics?

Discussion

993.	What will be the colour change when methyl orange is added to sodium hydroxide?
Answer» What will be the colour change when methyl orange is added to sodium hydroxide?

Discussion

994.	Question 28Some of the following statements are incorrect. Find the incorrect statements and correct them.(a) The property of metals by virtue of which they can be drawn into wires is called ductility.(b) Metals are good conductor of electricity but poor conductor of heat.(c) Articles made of metals produce ringing sound when struck hard.(d) Oxides of non-metals and metals are acidic in nature.(e) A less reactive metal replaces a more reactive metal from its salt solution in water.
Answer» Question 28 Some of the following statements are incorrect. Find the incorrect statements and correct them. (a) The property of metals by virtue of which they can be drawn into wires is called ductility. (b) Metals are good conductor of electricity but poor conductor of heat. (c) Articles made of metals produce ringing sound when struck hard. (d) Oxides of non-metals and metals are acidic in nature. (e) A less reactive metal replaces a more reactive metal from its salt solution in water.

Discussion

995.	What is Carbonization?
Answer» What is Carbonization?

Discussion

996.	73. How to calculate double bond equivalence
Answer» 73. How to calculate double bond equivalence

Discussion

997.	ntThe drain cleaner, Drainex contains small bits of Al which reacts with caustic soda to produce H2 . What volume of H2 at 20 degree and 1 bar will be released when 0.15g of Al reacts ?n
Answer» ntThe drain cleaner, Drainex contains small bits of Al which reacts with caustic soda to produce H2 . What volume of H2 at 20 degree and 1 bar will be released when 0.15g of Al reacts ?n

Discussion

998.	Why did Thomson choose electric current only and also electrons were already discovered during the flow of electricity.why didn't Thomson choose any other rays or any thing to conduct the canal ray experiment.
Answer» Why did Thomson choose electric current only and also electrons were already discovered during the flow of electricity.why didn't Thomson choose any other rays or any thing to conduct the canal ray experiment.

Discussion

999.	What is the difference between polythene and plastic?
Answer» What is the difference between polythene and plastic?

Discussion

1000.	Identify X and Y in the reaction given below. Zn(s) + 2HCl(aq)→X + Y
Answer» Identify X and Y in the reaction given below. $Zn(s) + 2HCl(aq) \to X + Y$

1000.

Identify X and Y in the reaction given below. Zn(s) + 2HCl(aq)→X + Y

Answer»

Identify X and Y in the reaction given below.

$Zn(s) + 2HCl(aq) \to X + Y$

Discussion

Explore topic-wise InterviewSolutions in .

Balance the following equations : (a) N2+H2→NH3 (b) H2+O2→H2O (c) Na2O+H2O→NaOH (d) CO+O2→CO2 (e) Zn+HCI→ZnCl2+H2

Question 10The material which is commonly used for making kitchen containers is(a) PVC(b) Acrylic(c) Teflon(d) PET

Which among the following is worst conductor of heat

Explain breifly that why Non-biodegradable waste is harmful to the environment? Give suitable examples.

In a large tank of cross-sectional area A, there is a small hole of area ‘a’ at the bottom. The time taken to emptying the tank from height h1 to h2 is

Why should we consume fossil fuel at a slower rate?

Gravitational potential energy U = mass × force of gravity on unit mass × ___

Word chemical reaction between magnesium and hydrochloric acid

Question 13The first model of an atom was given by(a) N. Bohr(b) E. Goldstein​​​​(c) Rutherford(d) J.J. Thomson

Why should the foodstuffs like orange juice,pickles,chutney and curd not be kept in iron or aluminium containers ?

A cotton shirt, before it reaches you, completes a long journey. Elaborate on this journey starting from cotton bolls.

You are given a solution of iron sulphate. Which of the following do you think cannot displace iron from iron sulphate ? (a) magnesium (b) calcium (c) copper (d) zinc

Which of the following characteristics is associated with gaseous state?

Question 10 (a)Saloni took a piece of burning charcoal and collected the gas evolved in a test tube.(a) How will she find the nature of the gas?

Which among the following elements possess the properties of hardness, malleability and ductility with?

Oxides of nitrogen and sulphur causes ______ rain when reacted with water vapour present in atmosphere.

Explain the difference between thermoplastic and thermosetting plastics.

A frontend loader applies a force of 150 N to lift a stone such that 2250 J of work is done. Find the displacement of the rock due to this force.

Give reason: Aluminium is used for wrapping food items. Metals are used in ringing bells. Phosphorus is stored in the water.

When blue litmus paper was dipped into the water, the colour of litmus paper remained the same. Similarly, when red litmus paper was dipped into water, the colour remained the same. By above observation we can concluded that:

we know that metals are sonorus but wood also produces some sound then wood is metal or not

(i) What is Brownian motion? Draw a diagram to show the movement of a particle (like a pollen grain) during Brownian motion.​(ii) In a beam of sunlight entering a room, we can sometimes see dust particles moving in a haphazard way in the air. Why do these dust particles move?

Water gas contains :

one gram of silver gets distributed between 10cm^3 of molten zink and 100cm^3 of molten lead of 800^° c . the percentage of silver in the zink layer is approximatel

5. The percentage composition of a solution is as follows 20percent urea,40percent glucose and 40percent water calculate the mole fraction of each component?

Of the group 18 elements, __ is the most abundant in the Earth’s crust.

Tears help our eyes by

Consider the following reaction. CaCO3(s) + H2O(l) + CO2(g) → Ca(HCO3)2(aq) Element Number of atoms present Reactant sideProduct sideCalcium11Carbon2YOxygenX6Hydrogen22 Recognise X and Y. The value of X + Y is___.

Does atoms and molecules really exist or, is it just our hypothesis?

We do not clean ponds or lakes, but an aquarium needs to be cleaned. Why?

Mention few example of exothermic reactions.

What is meant by collid ? Why do we call milk as collid? Explain.

what is antiseptic and disinfectants?

What is the percentage composition of iron in ferric sulphate, given mass of iron is 56 amu?

Which of the following are properties of an amorphous solid?

The oxygen dissociation curve shifts to the right when

Question 11One day Reeta went to a jeweller’s shop with her mother. Her mother gave old gold jewellery to the goldsmith to polish. Next day when they brought the jewellery back, they found that there was a slight loss in its weight. Can you suggest a reason for the loss in weight?

Consider the following chemical equation for the combustion of methane (CH4)CH4+2O2→CO2+2H2O

Your farewell is approaching. You go to the mall to get a nice dress for yourself. You found one pretty dress which was very soft, gave a good look, didn't need any ironing also and it was easy to wash. What could be the dress made up of?

PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Can you write the major difference between these two types of plastics?​

What will be the colour change when methyl orange is added to sodium hydroxide?

What is Carbonization?

73. How to calculate double bond equivalence

ntThe drain cleaner, Drainex contains small bits of Al which reacts with caustic soda to produce H2 . What volume of H2 at 20 degree and 1 bar will be released when 0.15g of Al reacts ?n

Why did Thomson choose electric current only and also electrons were already discovered during the flow of electricity.why didn't Thomson choose any other rays or any thing to conduct the canal ray experiment.

What is the difference between polythene and plastic?

Identify X and Y in the reaction given below. Zn(s) + 2HCl(aq)→X + Y

Question 13The first model of an atom was given by(a) N. Bohr(b) E. Goldstein(c) Rutherford(d) J.J. Thomson

(i) What is Brownian motion? Draw a diagram to show the movement of a particle (like a pollen grain) during Brownian motion.(ii) In a beam of sunlight entering a room, we can sometimes see dust particles moving in a haphazard way in the air. Why do these dust particles move?

PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Can you write the major difference between these two types of plastics?