7248 + Interview Questions in Chemistry Page 113 InterviewSolution

5601.	When an apple falls freely from the tree towards the ground, then its total mechanical energy throughout the fall will:
Answer» When an apple falls freely from the tree towards the ground, then its total mechanical energy throughout the fall will:

Discussion

5602.	What does a chemical formula represent?
Answer» What does a chemical formula represent?

Discussion

5603.	Observe a candle flame carefully. The shape of a candle flame is:
Answer» Observe a candle flame carefully. The shape of a candle flame is:

Discussion

5604.	State one disadvantage of using synthetic fibres for making clothes.
Answer» State one disadvantage of using synthetic fibres for making clothes.

Discussion

5605.	Difference between chemical and physical changes.
Answer» Difference between chemical and physical changes.

Discussion

5606.	The temporary hardness of water due to calcium bicarbonate can be removed by adding:
Answer» The temporary hardness of water due to calcium bicarbonate can be removed by adding:

Discussion

5607.	Name the man-made fibre which is regarded as artifical silk.
Answer» Name the man-made fibre which is regarded as artifical silk.

Discussion

5608.	___ is a subatomic particle, with no net electric charge and a mass slightly larger than that of a proton.
Answer» ___ is a subatomic particle, with no net electric charge and a mass slightly larger than that of a proton.

Discussion

5609.	Why don't other metals have the ability to form a protective layer on them after corrosion,like aluminium and copper?
Answer» Why don't other metals have the ability to form a protective layer on them after corrosion,like aluminium and copper?

Discussion

5610.	Is any fiber made of coal?
Answer» Is any fiber made of coal?

Discussion

5611.	Falling droplets of water are spherical in shape. This illustrates that
Answer» Falling droplets of water are spherical in shape. This illustrates that

Discussion

5612.	The synthetic polymer which can be used as a substitute for wool for making sweaters and shawls, etc., is : (a) nylon (b) polyester (c) terylene (d) acrylic
Answer» The synthetic polymer which can be used as a substitute for wool for making sweaters and shawls, etc., is : (a) nylon (b) polyester (c) terylene (d) acrylic

5612.

The synthetic polymer which can be used as a substitute for wool for making sweaters and shawls, etc., is : (a) nylon (b) polyester (c) terylene (d) acrylic

Answer»

The synthetic polymer which can be used as a substitute for wool for making sweaters and shawls, etc., is :

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

Discussion

5613.	Name the very poisonous gas produced by the incomplete combustion of fuels.
Answer» Name the very poisonous gas produced by the incomplete combustion of fuels.

Discussion

5614.	Choose the correct option(s) When the temperature increases:
Answer» Choose the correct option(s) When the temperature increases:

Discussion

5615.	Why on adding Na+ H2O---->(gives) NaOH + H2. Why do we not obtain Na2O + H2 ( oxide of Na)
Answer» Why on adding Na+ H2O---->(gives) NaOH + H2. Why do we not obtain Na2O + H2 ( oxide of Na)

Discussion

5616.	In burning a matchstick we see that there is a chemical reaction involved in which red phosphorus is converted to:
Answer» In burning a matchstick we see that there is a chemical reaction involved in which red phosphorus is converted to:

5616.

In burning a matchstick we see that there is a chemical reaction involved in which red phosphorus is converted to:

Answer»

In burning a matchstick we see that there is a chemical reaction involved in which red phosphorus is converted to:

Discussion

5617.	What is formed in the second stage during the formation of coal?
Answer» What is formed in the second stage during the formation of coal?

Discussion

5618.	Considering the following reactions, which is the most reactive metal of the given metals? Mg + ZnSO4→MgSO4 +Zn 2Na + MgSO4 →Na2SO4 + Mg 2Na + ZnSO4 →Na2SO4 +Zn
Answer» Considering the following reactions, which is the most reactive metal of the given metals? Mg + ZnSO₄→MgSO₄ +Zn 2Na + MgSO₄ →Na₂SO₄ + Mg 2Na + ZnSO₄ →Na₂SO₄ +Zn

Discussion

5619.	For the reaction : 2N2O5→4NO2+O2 Rate and rate constant 1.02×10−4 and 3.4×10−5s−1 respectively, then concentration of N2O5 at that time will be
Answer» For the reaction : $2 N_{2} O_{5} \to 4 N O_{2} + O_{2}$ Rate and rate constant $1.02 \times 10^{- 4}$ and $3.4 \times 10^{- 5} s^{- 1}$ respectively, then concentration of $N_{2} O_{5}$ at that time will be

Discussion

5620.	‘Manufacturing synthetic fibres is actually helping conservation of forests’. Comment. [5 MARKS]
Answer» ‘Manufacturing synthetic fibres is actually helping conservation of forests’. Comment. [5 MARKS]

Discussion

5621.	All laws of thermodynamics
Answer» All laws of thermodynamics

Discussion

5622.	Which of the following is the correct interpretation of the given symbol? 2H2
Answer» Which of the following is the correct interpretation of the given symbol? $2 H_{2}$

5622.

Which of the following is the correct interpretation of the given symbol? 2H2

Answer»

Which of the following is the correct interpretation of the given symbol?

$2 H_{2}$

Discussion

5623.	IN many chemical equation there are mixture of letters and numbers why is this so
Answer» IN many chemical equation there are mixture of letters and numbers why is this so

Discussion

5624.	Why can't an atom be further divided?
Answer» Why can't an atom be further divided?

Discussion

5625.	Salts are formed as a result of ____ reaction
Answer» Salts are formed as a result of ____ reaction

Discussion

5626.	Write the name of a fabric which is blend of cotten and polyester.and why plastic bag should not be thrown on the road?
Answer» Write the name of a fabric which is blend of cotten and polyester.and why plastic bag should not be thrown on the road?

Discussion

5627.	Rajnish: Hey Deepti, does a supersaturated solution made by increasing temperature stay like that forever when left idle in a room? Deepti gave him a blank look thinking Rajnish did not know the concept correctly Why did Deepti think Rajnish did not know the concept correctly?
Answer» Rajnish: Hey Deepti, does a supersaturated solution made by increasing temperature stay like that forever when left idle in a room? Deepti gave him a blank look thinking Rajnish did not know the concept correctly Why did Deepti think Rajnish did not know the concept correctly?

5627.

Rajnish: Hey Deepti, does a supersaturated solution made by increasing temperature stay like that forever when left idle in a room? Deepti gave him a blank look thinking Rajnish did not know the concept correctly Why did Deepti think Rajnish did not know the concept correctly?

Answer»

Rajnish: Hey Deepti, does a supersaturated solution made by increasing temperature stay like that forever when left idle in a room?
Deepti gave him a blank look thinking Rajnish did not know the concept correctly

Why did Deepti think Rajnish did not know the concept correctly?

Discussion

5628.	When we look at the moder periodic table, the metals are all concentrated on the left and centre of the table. Could you figure out what happens to the metallic reactivity when we move from left to right of the table?
Answer» When we look at the moder periodic table, the metals are all concentrated on the left and centre of the table. Could you figure out what happens to the metallic reactivity when we move from left to right of the table?

Discussion

5629.	Which of the following is used for the purification of water?
Answer» Which of the following is used for the purification of water?

Discussion

5630.	Which of the following statement is/are correct in regard to alloys as compared to pure metals?
Answer» Which of the following statement is/are correct in regard to alloys as compared to pure metals?

Discussion

5631.	How to remember reactivity series of metals?
Answer» How to remember reactivity series of metals?

Discussion

5632.	The number of electrons in a neutral atom with atomic number X and mass number Y will be:
Answer» The number of electrons in a neutral atom with atomic number X and mass number Y will be:

Discussion

5633.	The atomic number and the mass number of sodium are 11 and 23 respectively. What information is conveyed by this statement ?
Answer» The atomic number and the mass number of sodium are 11 and 23 respectively. What information is conveyed by this statement ?

5633.

The atomic number and the mass number of sodium are 11 and 23 respectively. What information is conveyed by this statement ?

Answer»

The atomic number and the mass number of sodium are 11 and 23 respectively. What information is conveyed by this statement ?

Discussion

5634.	Which gas is obtained during the processing of coal to get coke?
Answer» Which gas is obtained during the processing of coal to get coke?

Discussion

5635.	Question 8 Explain the process of formation of petroleum.
Answer» Question 8 Explain the process of formation of petroleum.

Discussion

5636.	Which of the following did the Rutherford model fails to explain?
Answer» Which of the following did the Rutherford model fails to explain?

Discussion

5637.	name any chemical chage which be revesed with it's explanation.
Answer» name any chemical chage which be revesed with it's explanation.

Discussion

5638.	Which of the following is/are metalloid?
Answer» Which of the following is/are metalloid?

Discussion

5639.	The general warming of global temperatures indicate that the mass balance of glaciers are negative because
Answer» The general warming of global temperatures indicate that the mass balance of glaciers are negative because

Discussion

5640.	Maximum number of hydrogen bonds formed by a H2O molecule is _____
Answer» Maximum number of hydrogen bonds formed by a $H_{2} O$ molecule is _____

Discussion

5641.	How does a blanket help in extinguishing fire? Can a blanket be used to cut off electrical fire? [3 MARKS]
Answer» How does a blanket help in extinguishing fire? Can a blanket be used to cut off electrical fire? [3 MARKS]

Discussion

5642.	Why do some elements have variable valency
Answer» Why do some elements have variable valency

Discussion

5643.	Why does the flame of a burning candle goes off when we blow over it strongly?
Answer» Why does the flame of a burning candle goes off when we blow over it strongly?

Discussion

5644.	Water which is free from all impurities and micro organisms and is thus fit for drinking is called
Answer» Water which is free from all impurities and micro organisms and is thus fit for drinking is called

Discussion

5645.	(a) What is chromatography ? For which type of mixture is it used ? (b) What are the advantages of chromatography ? (c) Give two applications of chromatography.
Answer» (a) What is chromatography ? For which type of mixture is it used ? (b) What are the advantages of chromatography ? (c) Give two applications of chromatography.

5645.

(a) What is chromatography ? For which type of mixture is it used ? (b) What are the advantages of chromatography ? (c) Give two applications of chromatography.

Answer»

(a) What is chromatography ? For which type of mixture is it used ?

(b) What are the advantages of chromatography ?

(c) Give two applications of chromatography.

Discussion

5646.	What is an atom and what is atomic number?
Answer» What is an atom and what is atomic number?

Discussion

5647.	Why does water molecules attract each other?
Answer» Why does water molecules attract each other?

Discussion

5648.	Water is released, when:
Answer» Water is released, when:

Discussion

5649.	What is pH value of a substance?
Answer» What is pH value of a substance?

Discussion

5650.	One bright sunny morning Rahul decided to parasail on the beach. He observed a number of dead fishes on the shore and black liquid floating on the water. The black colour liquid is due to-
Answer» One bright sunny morning Rahul decided to parasail on the beach. He observed a number of dead fishes on the shore and black liquid floating on the water. The black colour liquid is due to-

5650.

One bright sunny morning Rahul decided to parasail on the beach. He observed a number of dead fishes on the shore and black liquid floating on the water. The black colour liquid is due to-

Answer» One bright sunny morning Rahul decided to parasail on the beach. He observed a number of dead fishes

on the shore and black liquid floating on the water. The black colour liquid is due to-

Discussion

Explore topic-wise InterviewSolutions in .

When an apple falls freely from the tree towards the ground, then its total mechanical energy throughout the fall will:

What does a chemical formula represent?

Observe a candle flame carefully. The shape of a candle flame is:

State one disadvantage of using synthetic fibres for making clothes.

Difference between chemical and physical changes.

The temporary hardness of water due to calcium bicarbonate can be removed by adding:

Name the man-made fibre which is regarded as artifical silk.

___ is a subatomic particle, with no net electric charge and a mass slightly larger than that of a proton.

Why don't other metals have the ability to form a protective layer on them after corrosion,like aluminium and copper?

Is any fiber made of coal?

Falling droplets of water are spherical in shape. This illustrates that

The synthetic polymer which can be used as a substitute for wool for making sweaters and shawls, etc., is : (a) nylon (b) polyester (c) terylene (d) acrylic

Name the very poisonous gas produced by the incomplete combustion of fuels.

Choose the correct option(s) When the temperature increases:

Why on adding Na+ H2O---->(gives) NaOH + H2. Why do we not obtain Na2O + H2 ( oxide of Na)

In burning a matchstick we see that there is a chemical reaction involved in which red phosphorus is converted to:

What is formed in the second stage during the formation of coal?

Considering the following reactions, which is the most reactive metal of the given metals? Mg + ZnSO4→MgSO4 +Zn 2Na + MgSO4 →Na2SO4 + Mg 2Na + ZnSO4 →Na2SO4 +Zn

For the reaction : 2N2O5→4NO2+O2 Rate and rate constant 1.02×10−4 and 3.4×10−5s−1 respectively, then concentration of N2O5 at that time will be

‘Manufacturing synthetic fibres is actually helping conservation of forests’. Comment. [5 MARKS]

All laws of thermodynamics

Which of the following is the correct interpretation of the given symbol? 2H2

IN many chemical equation there are mixture of letters and numbers why is this so

Why can't an atom be further divided?

Salts are formed as a result of ____ reaction

Write the name of a fabric which is blend of cotten and polyester.and why plastic bag should not be thrown on the road?

Rajnish: Hey Deepti, does a supersaturated solution made by increasing temperature stay like that forever when left idle in a room? Deepti gave him a blank look thinking Rajnish did not know the concept correctly Why did Deepti think Rajnish did not know the concept correctly?

When we look at the moder periodic table, the metals are all concentrated on the left and centre of the table. Could you figure out what happens to the metallic reactivity when we move from left to right of the table?

Which of the following is used for the purification of water?

Which of the following statement is/are correct in regard to alloys as compared to pure metals?

How to remember reactivity series of metals?

The number of electrons in a neutral atom with atomic number X and mass number Y will be:

The atomic number and the mass number of sodium are 11 and 23 respectively. What information is conveyed by this statement ?

Which gas is obtained during the processing of coal to get coke?

Question 8 Explain the process of formation of petroleum.

Which of the following did the Rutherford model fails to explain?

name any chemical chage which be revesed with it's explanation.

Which of the following is/are metalloid?

The general warming of global temperatures indicate that the mass balance of glaciers are negative because

Maximum number of hydrogen bonds formed by a H2O molecule is _____

How does a blanket help in extinguishing fire? Can a blanket be used to cut off electrical fire? [3 MARKS]

Why do some elements have variable valency

Why does the flame of a burning candle goes off when we blow over it strongly?

Water which is free from all impurities and micro organisms and is thus fit for drinking is called

(a) What is chromatography ? For which type of mixture is it used ? (b) What are the advantages of chromatography ? (c) Give two applications of chromatography.

What is an atom and what is atomic number?

Why does water molecules attract each other?

Water is released, when:

What is pH value of a substance?

One bright sunny morning Rahul decided to parasail on the beach. He observed a number of dead fishes on the shore and black liquid floating on the water. The black colour liquid is due to-