3275 + Interview Questions in Chemistry Page 24 InterviewSolution

1151.	How can sodium and chlorine help each other achieve the octet configuration?
Answer» How can sodium and chlorine help each other achieve the octet configuration?

Discussion

1152.	Define the terms. Give one example for each technique.a. Sedimentation and decantationb. Evaporation
Answer» Define the terms. Give one example for each technique. a. Sedimentation and decantation b. Evaporation

Discussion

1153.	Amarnath needs two iron wires each of the length metres to hang up rubber sheets to dry. How much wire does he need in all?
Answer» Amarnath needs two iron wires each of the length metres to hang up rubber sheets to dry. How much wire does he need in all?

Discussion

1154.	What is the O.N of Cr in Cr2O7^-2
Answer» What is the O.N of Cr in Cr2O7^-2

Discussion

1155.

The properties and materials given below are incorrectly paired. Match the properties to the correct material and justify your answer. [5 MARKS] Property Materials Soluble in water Glass used in windows Shiny Coins Floats on water Bathing soap Soft Common salt Transparent Log of wood

Answer»

The properties and materials given below are incorrectly paired. Match the properties to the correct material and justify your answer. [5 MARKS]

Property		Materials
Soluble in water		Glass used in windows
Shiny		Coins
Floats on water		Bathing soap
Soft		Common salt
Transparent		Log of wood

Discussion

1156.	Give an example of a metal which: (a)Is a liquid at room temperature?(b) Can be easily cut with a knife?(c) Is the best conductor of heat?(d) Is a poor conductor of heat?
Answer» Give an example of a metal which: (a) Is a liquid at room temperature? (b) Can be easily cut with a knife? (c) Is the best conductor of heat? (d) Is a poor conductor of heat?

1156.

Give an example of a metal which: (a)Is a liquid at room temperature?(b) Can be easily cut with a knife?(c) Is the best conductor of heat?(d) Is a poor conductor of heat?

Answer»

Give an example of a metal which:

(a)

Is a liquid at room temperature?

(b)

Can be easily cut with a knife?

(c)

Is the best conductor of heat?

(d)

Is a poor conductor of heat?

Discussion

1157.	Question 1Pick the synthetic fibre out of the following?(a) Cotton(b) Nylon(c) Jute(d) Wool
Answer» Question 1 Pick the synthetic fibre out of the following? (a) Cotton (b) Nylon (c) Jute (d) Wool

Discussion

1158.	A dining hall dimension of 50m,15mand 3.5m calculate the mass of air in the hall giving density of air =1.3kg/m^3
Answer» A dining hall dimension of 50m,15mand 3.5m calculate the mass of air in the hall giving density of air =1.3kg/m^3

Discussion

1159.	Name : (a) Factories that use water on a large scale. (b) Effects of contaminated water. (c) Factors connected with good social health. (d) Diseases caused by mosquitoes. (e) Garbage that does not decompose.
Answer» Name : (a) Factories that use water on a large scale. (b) Effects of contaminated water. (c) Factors connected with good social health. (d) Diseases caused by mosquitoes. (e) Garbage that does not decompose.

1159.

Name : (a) Factories that use water on a large scale. (b) Effects of contaminated water. (c) Factors connected with good social health. (d) Diseases caused by mosquitoes. (e) Garbage that does not decompose.

Answer»

Name :

(a) Factories that use water on a large scale.

(b) Effects of contaminated water.

(c) Factors connected with good social health.

(d) Diseases caused by mosquitoes.

(e) Garbage that does not decompose.

Discussion

1160.	In the given experiment, the water rises because
Answer» In the given experiment, the water rises because

Discussion

1161.	what is depression in freezing point?
Answer» what is depression in freezing point?

Discussion

1162.	Calculation of kb of water
Answer» Calculation of kb of water

Discussion

1163.	Question 1 Why should a magnesium ribbon be cleaned before it is burnt in air?
Answer» Question 1 Why should a magnesium ribbon be cleaned before it is burnt in air?

Discussion

1164.	All irreversible changes are chemical changes. True or false?
Answer» All irreversible changes are chemical changes. True or false?

Discussion

1165.	Question 4You are a member of the municipal body of your town.Make a list of measures that would help your town to ensure the supply of clean water to all its residents.
Answer» Question 4 You are a member of the municipal body of your town. Make a list of measures that would help your town to ensure the supply of clean water to all its residents.

Discussion

1166.	What is sieving? Where is it used?
Answer» What is sieving? Where is it used?

Discussion

1167.	What is meant by shearing?
Answer» What is meant by shearing?

Discussion

1168.	What is the meaning of compaction of sedimentary layers?
Answer» What is the meaning of compaction of sedimentary layers?

Discussion

1169.	Gases posses neither fixed volume nor fixed shape because(a) molecules are loosely packed.(b) molecular motion is fast.(c) there is very little force between molecules.(d) it is difficult to make the molecules move away from each other.
Answer» Gases posses neither fixed volume nor fixed shape because (a) molecules are loosely packed. (b) molecular motion is fast. (c) there is very little force between molecules. (d) it is difficult to make the molecules move away from each other.

Discussion

1170.	What kind of reaction isa. melting of waxb. burning of wax?
Answer» What kind of reaction is a. melting of wax b. burning of wax?

Discussion

1171.	Mention the methods that can be used for the separation of the mixture having the following components:Wheat flour, sugar crystals and husk.
Answer» Mention the methods that can be used for the separation of the mixture having the following components: Wheat flour, sugar crystals and husk.

Discussion

1172.	Raj's house was under construction. During the construction, he saw a man removing pebbles and stones using a plastic mesh held in a frame.Which method of separation is used here? Explain it in detail while also mentioning examples.
Answer» Raj's house was under construction. During the construction, he saw a man removing pebbles and stones using a plastic mesh held in a frame.Which method of separation is used here? Explain it in detail while also mentioning examples.

1172.

Raj's house was under construction. During the construction, he saw a man removing pebbles and stones using a plastic mesh held in a frame.Which method of separation is used here? Explain it in detail while also mentioning examples.

Answer»

Raj's house was under construction. During the construction, he saw a man removing pebbles and stones using a plastic mesh held in a frame.Which method of separation is used here? Explain it in detail while also mentioning examples.

Discussion

1173.	How is sand useful for extinguishing fire?
Answer» How is sand useful for extinguishing fire?

Discussion

1174.	Find out the correct statement from the statements given below.
Answer» Find out the correct statement from the statements given below.

Discussion

1175.	Why is a pH test necessary to identify soil fertility?
Answer» Why is a pH test necessary to identify soil fertility?

Discussion

1176.	What is umbo?
Answer» What is umbo?

Discussion

1177.	How will you show that air is dissolved in water?
Answer» How will you show that air is dissolved in water?

Discussion

1178.	Define saturated solution
Answer» Define saturated solution

Discussion

1179.	What is sarcomere and what are its components ? Give a neat and clean diagram.
Answer» What is sarcomere and what are its components ? Give a neat and clean diagram.

Discussion

1180.	Observe the following graph. Considering the change in volume of water as its temperature is raised from 0°C, discuss the difference in the behaviour of water and other substances. What is this behaviour of water called?
Answer» Observe the following graph. Considering the change in volume of water as its temperature is raised from 0°C, discuss the difference in the behaviour of water and other substances. What is this behaviour of water called?

Discussion

1181.	Choose the correct pairs of object which have the same hardness.
Answer» Choose the correct pairs of object which have the same hardness.

Discussion

1182.	How would you obtain clear water from a sample of muddy water?
Answer» How would you obtain clear water from a sample of muddy water?

Discussion

1183.	Difference between yarn and fibre
Answer» Difference between yarn and fibre

Discussion

1184.	Why solubility is increased while heating?
Answer» Why solubility is increased while heating?

Discussion

1185.	How SO3H show -I effect?Explain
Answer» How SO3H show -I effect?Explain

Discussion

1186.	Name four sources of water. [2 MARKS]
Answer» Name four sources of water. [2 MARKS]

Discussion

1187.	Select an example of reversible change.
Answer» Select an example of reversible change.

Discussion

1188.	Question 4The term used for the process of separation of grains from the chaff is called(a) sieving(b) threshing(c) winnowing (d) hand picking
Answer» Question 4 The term used for the process of separation of grains from the chaff is called (a) sieving (b) threshing (c) winnowing (d) hand picking

Discussion

1189.	Which of the following bio-reserves of India is/are included in the world network of biosphere? (i) Manas (ii) Gulf of Mannar (iii) Dihang-Dibang (iv) Nanda Devi
Answer» Which of the following bio-reserves of India is/are included in the world network of biosphere? (i) Manas (ii) Gulf of Mannar (iii) Dihang-Dibang (iv) Nanda Devi

Discussion

1190.	What does zwitterionic mean?
Answer» What does zwitterionic mean?

Discussion

1191.	What is meant by absolute temperature ?
Answer» What is meant by absolute temperature ?

Discussion

1192.	Oceans and seas make up 71% of the Earth’s surface. What percentage of this total quantity is available for human consumption?
Answer» Oceans and seas make up $71 %$ of the Earth’s surface. What percentage of this total quantity is available for human consumption?

Discussion

1193.	Question 4 Define catalyst. Write any three differences between physical and chemical change. (c) Classify the following processes into physical or chemical changes.baking of bread, switching of an electric bulb, curdling of milk, dissolving sodium chloride in water, photosynthesis, rusting of iron, evaporation of water, formation of dew, sublimation of camphor, burning of charcoal or LPG, clotting of blood, crystallization of sugar, ripening of fruit, cooking of vegetables, melting of wax.
Answer» Question 4 Define catalyst. Write any three differences between physical and chemical change. (c) Classify the following processes into physical or chemical changes. baking of bread, switching of an electric bulb, curdling of milk, dissolving sodium chloride in water, photosynthesis, rusting of iron, evaporation of water, formation of dew, sublimation of camphor, burning of charcoal or LPG, clotting of blood, crystallization of sugar, ripening of fruit, cooking of vegetables, melting of wax.

1193.

Question 4 Define catalyst. Write any three differences between physical and chemical change. (c) Classify the following processes into physical or chemical changes.baking of bread, switching of an electric bulb, curdling of milk, dissolving sodium chloride in water, photosynthesis, rusting of iron, evaporation of water, formation of dew, sublimation of camphor, burning of charcoal or LPG, clotting of blood, crystallization of sugar, ripening of fruit, cooking of vegetables, melting of wax.

Answer»

Question 4

Define catalyst.

Write any three differences between physical and chemical change.

(c) Classify the following processes into physical or chemical changes.

baking of bread, switching of an electric bulb, curdling of milk, dissolving sodium chloride in water, photosynthesis, rusting of iron, evaporation of water, formation of dew, sublimation of camphor, burning of charcoal or LPG, clotting of blood, crystallization of sugar, ripening of fruit, cooking of vegetables, melting of wax.

Discussion

1194.	Considering air as a 4:1 mixture of N_2 and O2,what is the density of air at 28^° C and 1 atm?(2) 11.62 mg L^{-1}(1) 1.18 g L^{-1}(4) 1.29 g L^{-1}(3) 28.8 g L^{-1}
Answer» Considering air as a 4:1 mixture of N_2 and O2,what is the density of air at 28^° C and 1 atm?(2) 11.62 mg L^{-1}(1) 1.18 g L^{-1}(4) 1.29 g L^{-1}(3) 28.8 g L^{-1}

Discussion

1195.	What is the chemical formula structure of ozone?
Answer» What is the chemical formula structure of ozone?

Discussion

1196.	You are handed a mixture of sand and salt. How do you separate the two substances? Anything added to the mixture has to be retrieved.
Answer» You are handed a mixture of sand and salt. How do you separate the two substances? Anything added to the mixture has to be retrieved.

Discussion

1197.	Give an example in the given case:(a) Change which occurs on heating but can be reversed.(b) Change that occurs on heating but cannot be reversed.(c) Change occurs on cooling but can be reversed.(d) Change occurs on mixing two substances but can be reversed.(e) Change which occurs on mixing two substances, but cannot be reversed.
Answer» Give an example in the given case: (a) Change which occurs on heating but can be reversed. (b) Change that occurs on heating but cannot be reversed. (c) Change occurs on cooling but can be reversed. (d) Change occurs on mixing two substances but can be reversed. (e) Change which occurs on mixing two substances, but cannot be reversed.

Discussion

1198.	Question 7What will happen if....? And why?(a) Nails are made of plastic.(b) A bell is made of wood.(c) Rubber is not fitted on a pair of tongs.(d) A knife is made of wood.(e) An axe is made of rubber.
Answer» Question 7 What will happen if....? And why? (a) Nails are made of plastic. (b) A bell is made of wood. (c) Rubber is not fitted on a pair of tongs. (d) A knife is made of wood. (e) An axe is made of rubber.

1198.

Question 7What will happen if....? And why?(a) Nails are made of plastic.(b) A bell is made of wood.(c) Rubber is not fitted on a pair of tongs.(d) A knife is made of wood.(e) An axe is made of rubber.

Answer»

Question 7

What will happen if....? And why?

(a) Nails are made of plastic.

(b) A bell is made of wood.

(c) Rubber is not fitted on a pair of tongs.

(d) A knife is made of wood.

(e) An axe is made of rubber.

Discussion

1199.	_____ is a combination of two or more different kinds of substances.
Answer» _____ is a combination of two or more different kinds of substances.

Discussion

1200.	What is the function of carbon dioxide (CO2)?
Answer» What is the function of carbon dioxide ( $C O_{2}$ )?

Discussion

Explore topic-wise InterviewSolutions in .

How can sodium and chlorine help each other achieve the octet configuration?

Define the terms. Give one example for each technique.a. Sedimentation and decantationb. Evaporation

Amarnath needs two iron wires each of the length metres to hang up rubber sheets to dry. How much wire does he need in all?

What is the O.N of Cr in Cr2O7^-2

The properties and materials given below are incorrectly paired. Match the properties to the correct material and justify your answer. [5 MARKS] Property Materials Soluble in water Glass used in windows Shiny Coins Floats on water Bathing soap Soft Common salt Transparent Log of wood

Give an example of a metal which: ​(a)Is a liquid at room temperature?(b) Can be easily cut with a knife?(c) Is the best conductor of heat?(d) Is a poor conductor of heat?

Question 1Pick the synthetic fibre out of the following?(a) Cotton(b) Nylon(c) Jute(d) Wool

A dining hall dimension of 50m,15mand 3.5m calculate the mass of air in the hall giving density of air =1.3kg/m^3

Name : (a) Factories that use water on a large scale. (b) Effects of contaminated water. (c) Factors connected with good social health. (d) Diseases caused by mosquitoes. (e) Garbage that does not decompose.

In the given experiment, the water rises because

what is depression in freezing point?

Calculation of kb of water

Question 1 Why should a magnesium ribbon be cleaned before it is burnt in air?

All irreversible changes are chemical changes. True or false?

Question 4You are a member of the municipal body of your town.Make a list of measures that would help your town to ensure the supply of clean water to all its residents.

What is sieving? Where is it used?

What is meant by shearing?

What is the meaning of compaction of sedimentary layers?

Gases posses neither fixed volume nor fixed shape because(a) molecules are loosely packed.(b) molecular motion is fast.(c) there is very little force between molecules.(d) it is difficult to make the molecules move away from each other.

What kind of reaction isa. melting of waxb. burning of wax?

Mention the methods that can be used for the separation of the mixture having the following components:Wheat flour, sugar crystals and husk.

Raj's house was under construction. During the construction, he saw a man removing pebbles and stones using a plastic mesh held in a frame.Which method of separation is used here? Explain it in detail while also mentioning examples.

How is sand useful for extinguishing fire?

Find out the correct statement from the statements given below.

Why is a pH test necessary to identify soil fertility?

What is umbo?

How will you show that air is dissolved in water?

Define saturated solution

What is sarcomere and what are its components ? Give a neat and clean diagram.

Observe the following graph. Considering the change in volume of water as its temperature is raised from 0°C, discuss the difference in the behaviour of water and other substances. What is this behaviour of water called?

Choose the correct pairs of object which have the same hardness.

How would you obtain clear water from a sample of muddy water?​

Difference between yarn and fibre

Why solubility is increased while heating?

How SO3H show -I effect?Explain

Name four sources of water. [2 MARKS]

Select an example of reversible change.

Question 4The term used for the process of separation of grains from the chaff is called(a) sieving(b) threshing(c) winnowing (d) hand picking

Which of the following bio-reserves of India is/are included in the world network of biosphere? (i) Manas (ii) Gulf of Mannar (iii) Dihang-Dibang (iv) Nanda Devi

What does zwitterionic mean?

What is meant by absolute temperature ?

Oceans and seas make up 71% of the Earth’s surface. What percentage of this total quantity is available for human consumption?

Considering air as a 4:1 mixture of N_2 and O2,what is the density of air at 28^° C and 1 atm?(2) 11.62 mg L^{-1}(1) 1.18 g L^{-1}(4) 1.29 g L^{-1}(3) 28.8 g L^{-1}

What is the chemical formula structure of ozone?

You are handed a mixture of sand and salt. How do you separate the two substances? Anything added to the mixture has to be retrieved.

Question 7What will happen if....? And why?(a) Nails are made of plastic.(b) A bell is made of wood.(c) Rubber is not fitted on a pair of tongs.(d) A knife is made of wood.(e) An axe is made of rubber.

_____ is a combination of two or more different kinds of substances.

What is the function of carbon dioxide (CO2)?

Give an example of a metal which: (a)Is a liquid at room temperature?(b) Can be easily cut with a knife?(c) Is the best conductor of heat?(d) Is a poor conductor of heat?

How would you obtain clear water from a sample of muddy water?