7248 + Interview Questions in Chemistry Page 45 InterviewSolution

2201.	How does the colour of litmus change in basic and acidic medium?
Answer» How does the colour of litmus change in basic and acidic medium?

Discussion

2202.	The fine black particles, chiefly composed of carbon, produced by incomplete Burning is ___________.
Answer» The fine black particles, chiefly composed of carbon, produced by incomplete Burning is ___________.

Discussion

2203.	Why does boiling happens all through the liquid and evaporation only at the surface even though both the processes are quite same? What exactly happens at the molecular level in both the cases?
Answer» Why does boiling happens all through the liquid and evaporation only at the surface even though both the processes are quite same? What exactly happens at the molecular level in both the cases?

Discussion

2204.	Define ozone layer. Why is ozone layer getting depleted at higher level of the atmosphere?
Answer» Define ozone layer. Why is ozone layer getting depleted at higher level of the atmosphere?

Discussion

2205.	Question 6Metals are generally solid. Which of the following metals is in the liquid state at room temperature?(a) mercury(b) silver(c) aluminium(d) sodium
Answer» Question 6 Metals are generally solid. Which of the following metals is in the liquid state at room temperature? (a) mercury (b) silver (c) aluminium (d) sodium

Discussion

2206.	When do metals form there oxide or hydroxide when reacted with water?
Answer» When do metals form there oxide or hydroxide when reacted with water?

Discussion

2207.	Alex is confused between two shirts for his bonfire party. One is made up of cotton fibre and the other is made up of polyester fibre. Which one should he prefer to wear and why?
Answer» Alex is confused between two shirts for his bonfire party. One is made up of cotton fibre and the other is made up of polyester fibre. Which one should he prefer to wear and why?

Discussion

2208.	The figure given below shows a situation of a pond situated near an oil palm estate.What could be the possible reason for the death of the fish in the pond next to the oil palm estate?
Answer» The figure given below shows a situation of a pond situated near an oil palm estate. What could be the possible reason for the death of the fish in the pond next to the oil palm estate?

Discussion

2209.	Which state of metal shows metallic lustre
Answer» Which state of metal shows metallic lustre

Discussion

2210.	What is the mas of the precipitate formed when 50ml of 16.9% (w/v) solution of AgNO3 is mixed with 50ml of 5.8% (w/v) NaCl solution ?
Answer» What is the mas of the precipitate formed when 50ml of 16.9% (w/v) solution of AgNO3 is mixed with 50ml of 5.8% (w/v) NaCl solution ?

Discussion

2211.	List some uses of silicon.
Answer» List some uses of silicon.

Discussion

2212.	The correct order of negative value of electron gain enthalpy is:[0.77 Mark]
Answer» The correct order of negative value of electron gain enthalpy is: [0.77 Mark]

Discussion

2213.	Which of these reactions release a gas which burns with a pop sound?
Answer» Which of these reactions release a gas which burns with a pop sound?

Discussion

2214.	Give any four factors which are responsible for the destruction of forests.
Answer» Give any four factors which are responsible for the destruction of forests.

Discussion

2215.	Write short notes on 5 metallic properties of metals. [5 MARKS]
Answer» Write short notes on 5 metallic properties of metals. [5 MARKS]

Discussion

2216.	Question 12In villages, people use wood as fuel because:(a) it is considered to be an ideal fuel(b) Of its easy availability and low cost.(c) it is environment friendly.(d) it catches fire easily.
Answer» Question 12 In villages, people use wood as fuel because: (a) it is considered to be an ideal fuel (b) Of its easy availability and low cost. (c) it is environment friendly. (d) it catches fire easily.

Discussion

2217.	What is the reaction when sodium nitrate and sulphuric acid reacts below 200 degree celsius and what are the products formed ?
Answer» What is the reaction when sodium nitrate and sulphuric acid reacts below 200 degree celsius and what are the products formed ?

Discussion

2218.	Paheli kept some water in a beaker for heating. She observed that tiny bubbles appeared before the water started to boil. She boiled the water for about 5 minutes and filled it in a bottle up to the brim and kept the bottle airtight till it cooled down to room temperature.(a) Why did the tiny bubbles appeared?(b) Do you think tiny bubbles will appear on heating the water taken out from the bottle? Justify your answer
Answer» Paheli kept some water in a beaker for heating. She observed that tiny bubbles appeared before the water started to boil. She boiled the water for about 5 minutes and filled it in a bottle up to the brim and kept the bottle airtight till it cooled down to room temperature. (a) Why did the tiny bubbles appeared? (b) Do you think tiny bubbles will appear on heating the water taken out from the bottle? Justify your answer

Discussion

2219.	Copper exhibits two types of valencies. Their sum is:
Answer» Copper exhibits two types of valencies. Their sum is:

Discussion

2220.	87.Between Na+ and Ag+ which is stronger Lewis acid and why
Answer» 87.Between Na+ and Ag+ which is stronger Lewis acid and why

Discussion

2221.	What is the difference between metal oxide and non-metal oxide?
Answer» What is the difference between metal oxide and non-metal oxide?

Discussion

2222.	Question 30How can we reduce, reuse and recycle water?
Answer» Question 30 How can we reduce, reuse and recycle water?

Discussion

2223.	List the various sources of water.
Answer» List the various sources of water.

Discussion

2224.	Two metallic oxides contains 27.6% and 30% oxygen respectively. If the formula of the first oxide is X3O4, that of second will be??
Answer» Two metallic oxides contains 27.6% and 30% oxygen respectively. If the formula of the first oxide is X3O4, that of second will be??

Discussion

2225.	In P4O10 the number co ordinate bonds is
Answer» In P4O10 the number co ordinate bonds is

Discussion

2226.	Volume of oxygen at NTP, required to complete burn 1kg of coal (100% carbon) is
Answer» Volume of oxygen at NTP, required to complete burn 1kg of coal (100% carbon) is

Discussion

2227.	What do you understand by the term biodegradable?
Answer» What do you understand by the term biodegradable?

Discussion

2228.	Can the process of rusting be called combustion? Discuss.
Answer» Can the process of rusting be called combustion? Discuss.

Discussion

2229.	Is heating a physical or chemical process
Answer» Is heating a physical or chemical process

Discussion

2230.	If there is no oxygen in space then how does combustion take place inside the sun ?
Answer» If there is no oxygen in space then how does combustion take place inside the sun ?

Discussion

2231.	An atom of an element (X) has its K, L and M shells filled with some electrons. It reacts with sodium metal to form a compound NaX. The number of electrons in the valence shell of the atom (X) will be
Answer» An atom of an element (X) has its K, L and M shells filled with some electrons. It reacts with sodium metal to form a compound NaX. The number of electrons in the valence shell of the atom (X) will be

Discussion

2232.	The particles in both a suspension and a colloid can ______.
Answer» The particles in both a suspension and a colloid can ______.

Discussion

2233.	The advantage of acrylic over other fabrics is_____.
Answer» The advantage of acrylic over other fabrics is_____.

Discussion

2234.	When two point charges are kept at a distance R,the repulsive force between them is F. When thepoint charges are replaced by identical sphere havingsame charges, having their center seperated by R,the force becomes F', then F is2 Less than F(4) Can't say(3) Greater than F
Answer» When two point charges are kept at a distance R,the repulsive force between them is F. When thepoint charges are replaced by identical sphere havingsame charges, having their center seperated by R,the force becomes F', then F is2 Less than F(4) Can't say(3) Greater than F

Discussion

2235.	Pieces of iron taken in a spatula is burnt, but it fails to burn. Hence it can be concluded that iron is a/an:
Answer» Pieces of iron taken in a spatula is burnt, but it fails to burn. Hence it can be concluded that iron is a/an:

Discussion

2236.	The total number of electrons in 2g of D2O to 1.8 g of H2O
Answer» The total number of electrons in 2g of D2O to 1.8 g of H2O

Discussion

2237.	does a low energy electron have great difficulty in passing through a solid conductor?
Answer» does a low energy electron have great difficulty in passing through a solid conductor?

Discussion

2238.	Among the following, the substance expected to have the highest ignition temperature is
Answer» Among the following, the substance expected to have the highest ignition temperature is

Discussion

2239.	Total no of electron in 0.5 mol of sulphate ion
Answer» Total no of electron in 0.5 mol of sulphate ion

Discussion

2240.	Which of the following is used to reduce alumina Al2O3 to aluminium in Hall-Heroult's process?
Answer» Which of the following is used to reduce alumina $A l_{2} O_{3}$ to aluminium in Hall-Heroult's process?

Discussion

2241.	Paraffin wax finds its use in the manufacture of:
Answer» Paraffin wax finds its use in the manufacture of:

Discussion

2242.	The gas phase thermal decomposition of one mole of di-tert-butyl peroxide, in a constant volume apparatus, yields two moles of acetone and one mole of ethane. If the reaction obeys first order kinetics, the correct expression for the rate constant as a function of time (t), initial pressure (pi) and total pressure (p).
Answer» The gas phase thermal decomposition of one mole of di-tert-butyl peroxide, in a constant volume apparatus, yields two moles of acetone and one mole of ethane. If the reaction obeys first order kinetics, the correct expression for the rate constant as a function of time $(t)$ , initial pressure $(p_{i})$ and total pressure $(p)$ .

Discussion

2243.	Out of the following substances, which is an example of a compound?
Answer» Out of the following substances, which is an example of a compound?

Discussion

2244.	what is Stereospeicific and stereoselective whi shows SN1 and SN
Answer» what is Stereospeicific and stereoselective whi shows SN1 and SN

Discussion

2245.	The bottom of cooking vessels gets blackened when used on a gas/kerosene stove due to:
Answer» The bottom of cooking vessels gets blackened when used on a gas/kerosene stove due to:

Discussion

2246.	The work done in shifting a baggage from the first floor of a building to the second floor is 100 J. The change in gravitational potential energy of the baggage is:
Answer» The work done in shifting a baggage from the first floor of a building to the second floor is 100 J. The change in gravitational potential energy of the baggage is:

Discussion

2247.	___ is the property of a substance which allows it to be beaten into a flat sheet.
Answer» ___ is the property of a substance which allows it to be beaten into a flat sheet.

Discussion

2248.	Question 34Why are detergents better cleansing agents than soaps? Explain.
Answer» Question 34 Why are detergents better cleansing agents than soaps? Explain.

Discussion

2249.	Why is the electronic configuration of potassium 2,8,8,1 and not 2,8,9
Answer» Why is the electronic configuration of potassium 2,8,8,1 and not 2,8,9

Discussion

2250.	Question 2Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?
Answer» Question 2 Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?

Discussion

Explore topic-wise InterviewSolutions in .

How does the colour of litmus change in basic and acidic medium?

The fine black particles, chiefly composed of carbon, produced by incomplete Burning is ___________.

Why does boiling happens all through the liquid and evaporation only at the surface even though both the processes are quite same? What exactly happens at the molecular level in both the cases?

Define ozone layer. Why is ozone layer getting depleted at higher level of the atmosphere?

Question 6Metals are generally solid. Which of the following metals is in the liquid state at room temperature?(a) mercury(b) silver(c) aluminium(d) sodium

When do metals form there oxide or hydroxide when reacted with water?

Alex is confused between two shirts for his bonfire party. One is made up of cotton fibre and the other is made up of polyester fibre. Which one should he prefer to wear and why?

The figure given below shows a situation of a pond situated near an oil palm estate.What could be the possible reason for the death of the fish in the pond next to the oil palm estate?

Which state of metal shows metallic lustre

What is the mas of the precipitate formed when 50ml of 16.9% (w/v) solution of AgNO3 is mixed with 50ml of 5.8% (w/v) NaCl solution ?

List some uses of silicon.

The correct order of negative value of electron gain enthalpy is:[0.77 Mark]

Which of these reactions release a gas which burns with a pop sound?

Give any four factors which are responsible for the destruction of forests.

Write short notes on 5 metallic properties of metals. [5 MARKS]

Question 12In villages, people use wood as fuel because:(a) it is considered to be an ideal fuel(b) Of its easy availability and low cost.(c) it is environment friendly.(d) it catches fire easily.

What is the reaction when sodium nitrate and sulphuric acid reacts below 200 degree celsius and what are the products formed ?

Copper exhibits two types of valencies. Their sum is:

87.Between Na+ and Ag+ which is stronger Lewis acid and why

What is the difference between metal oxide and non-metal oxide?

Question 30How can we reduce, reuse and recycle water?

List the various sources of water.

Two metallic oxides contains 27.6% and 30% oxygen respectively. If the formula of the first oxide is X3O4, that of second will be??

In P4O10 the number co ordinate bonds is

Volume of oxygen at NTP, required to complete burn 1kg of coal (100% carbon) is

What do you understand by the term biodegradable?

Can the process of rusting be called combustion? Discuss.

Is heating a physical or chemical process

If there is no oxygen in space then how does combustion take place inside the sun ?

An atom of an element (X) has its K, L and M shells filled with some electrons. It reacts with sodium metal to form a compound NaX. The number of electrons in the valence shell of the atom (X) will be

The particles in both a suspension and a colloid can ______.

The advantage of acrylic over other fabrics is_____.

When two point charges are kept at a distance R,the repulsive force between them is F. When thepoint charges are replaced by identical sphere havingsame charges, having their center seperated by R,the force becomes F', then F is2 Less than F(4) Can't say(3) Greater than F

Pieces of iron taken in a spatula is burnt, but it fails to burn. Hence it can be concluded that iron is a/an:

The total number of electrons in 2g of D2O to 1.8 g of H2O

does a low energy electron have great difficulty in passing through a solid conductor?

Among the following, the substance expected to have the highest ignition temperature is

Total no of electron in 0.5 mol of sulphate ion

Which of the following is used to reduce alumina Al2O3 to aluminium in Hall-Heroult's process?

Paraffin wax finds its use in the manufacture of:

Out of the following substances, which is an example of a compound?

what is Stereospeicific and stereoselective whi shows SN1 and SN

The bottom of cooking vessels gets blackened when used on a gas/kerosene stove due to:

The work done in shifting a baggage from the first floor of a building to the second floor is 100 J. The change in gravitational potential energy of the baggage is:

___ is the property of a substance which allows it to be beaten into a flat sheet.

Question 34Why are detergents better cleansing agents than soaps? Explain.

Why is the electronic configuration of potassium 2,8,8,1 and not 2,8,9

Question 2Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?