10223 + Interview Questions in Chemistry Page 148 InterviewSolution

7351.	Few properties are mentioned below. Specify the property as mixture or compounds: STATEMENT 1: The constituents can be separated easily by physical means. STATEMENT 2: Has a variable composition. STATEMENT 3: The composition is constant. STATEMENT 4: Shows entirely different properties from those of the constituents.
Answer» Few properties are mentioned below. Specify the property as mixture or compounds: STATEMENT 1: The constituents can be separated easily by physical means. STATEMENT 2: Has a variable composition. STATEMENT 3: The composition is constant. STATEMENT 4: Shows entirely different properties from those of the constituents.

7351.

Few properties are mentioned below. Specify the property as mixture or compounds: STATEMENT 1: The constituents can be separated easily by physical means. STATEMENT 2: Has a variable composition. STATEMENT 3: The composition is constant. STATEMENT 4: Shows entirely different properties from those of the constituents.

Answer»

Few properties are mentioned below. Specify the property as mixture or compounds:

STATEMENT 1: The constituents can be separated easily by physical means.

STATEMENT 2: Has a variable composition.

STATEMENT 3: The composition is constant.

STATEMENT 4: Shows entirely different properties from those of the constituents.

Discussion

7352.	The strength of London forces do not increase with the increase in
Answer» The strength of London forces do not increase with the increase in

Discussion

7353.	Give a reason for the following observations. (a) Naphthalene balls disappear with time without leaving any solid. (b) We can get the smell of perfume sitting several meters away. [3 MARKS]
Answer» Give a reason for the following observations. (a) Naphthalene balls disappear with time without leaving any solid. (b) We can get the smell of perfume sitting several meters away. [3 MARKS]

7353.

Give a reason for the following observations. (a) Naphthalene balls disappear with time without leaving any solid. (b) We can get the smell of perfume sitting several meters away. [3 MARKS]

Answer»

Give a reason for the following observations.

(a) Naphthalene balls disappear with time without leaving any solid.
(b) We can get the smell of perfume sitting several meters away. [3 MARKS]

Discussion

7354.	What is octet configuration
Answer» What is octet configuration

Discussion

7355.	Which law governs the relationship between solubility of a gas in a liquid and the pressure exerted by the gas on the surface?
Answer» Which law governs the relationship between solubility of a gas in a liquid and the pressure exerted by the gas on the surface?

Discussion

7356.	Californium is the member of__________.
Answer» Californium is the member of__________.

Discussion

7357.	The ionic compound Ca(OH)2 on dissociation will give cation X. The charge on this cation is ___.
Answer» The ionic compound $C a (O H)_{2}$ on dissociation will give cation X. The charge on this cation is ___.

Discussion

7358.	Find the formula of ammonium sulphate. [3 MARKS]
Answer» Find the formula of ammonium sulphate. [3 MARKS]

Discussion

7359.	Is air a homogenous or heterogeneous mixture?
Answer» Is air a homogenous or heterogeneous mixture?

Discussion

7360.	(a) What is meant by (i) elements (ii) compounds, and (iii) mixtures? Write down the names of two elements, two compounds and two mixtures. (b) Classify the following into elements, compounds and mixtures : Marble, Air, Gold, Brass, Sand, Diamond, Graphite, Petroleum, Common salt, Sea-water, Chalk
Answer» (a) What is meant by (i) elements (ii) compounds, and (iii) mixtures? Write down the names of two elements, two compounds and two mixtures. (b) Classify the following into elements, compounds and mixtures : Marble, Air, Gold, Brass, Sand, Diamond, Graphite, Petroleum, Common salt, Sea-water, Chalk

7360.

(a) What is meant by (i) elements (ii) compounds, and (iii) mixtures? Write down the names of two elements, two compounds and two mixtures. (b) Classify the following into elements, compounds and mixtures : Marble, Air, Gold, Brass, Sand, Diamond, Graphite, Petroleum, Common salt, Sea-water, Chalk

Answer»

(a) What is meant by (i) elements (ii) compounds, and (iii) mixtures? Write down the names of two elements, two compounds and two mixtures.

(b) Classify the following into elements, compounds and mixtures :

Marble, Air, Gold, Brass, Sand, Diamond, Graphite, Petroleum, Common salt, Sea-water, Chalk

Discussion

7361.	Define plasma and Bose Einstine Condensate with diagram and examples
Answer» Define plasma and Bose Einstine Condensate with diagram and examples

Discussion

7362.	What is element and compound?
Answer» What is element and compound?

Discussion

7363.	Calgon is chemically called as ______
Answer» Calgon is chemically called as ______

Discussion

7364.	How water vapour forms?
Answer» How water vapour forms?

Discussion

7365.	How will you recover common salt from salt-water mixture?
Answer» How will you recover common salt from salt-water mixture?

Discussion

7366.	During the alpha-particle scattering experiment, which of the following observations is correct for most of the alpha-particles?
Answer» During the alpha-particle scattering experiment, which of the following observations is correct for most of the alpha-particles?

Discussion

7367.	Latent heat of fusion and vaporization
Answer» Latent heat of fusion and vaporization

Discussion

7368.	Question 7 Name two metals which will displace hydrogen from dilute acids and two metals which will not.
Answer» Question 7 Name two metals which will displace hydrogen from dilute acids and two metals which will not.

Discussion

7369.	We can easily move our hand in the air but we cannot move our hand through a wooden table. Identify the correct reason for the same.
Answer» We can easily move our hand in the air but we cannot move our hand through a wooden table. Identify the correct reason for the same.

Discussion

7370.	Which of the following compounds are poor conductors of electricity?
Answer» Which of the following compounds are poor conductors of electricity?

Discussion

7371.	If same weight of liquid water and piece of ice is taken, then why is density of ice less than that of liquid water?
Answer» If same weight of liquid water and piece of ice is taken, then why is density of ice less than that of liquid water?

Discussion

7372.	Why is water H2O and not OH2 & NaCl and not ClNa?
Answer» Why is water H₂O and not OH₂ & NaCl and not ClNa?

Discussion

7373.	Differentiate between isotopes of hydrogen.(3mark)
Answer» Differentiate between isotopes of hydrogen.(3mark)

Discussion

7374.	Blue color X changes to white color Y on heating and when we moisten Y, Blue color X reappers. This is because has some water of crystallisation.
Answer» Blue color X changes to white color Y on heating and when we moisten Y, Blue color X reappers. This is because has some water of crystallisation.

Discussion

7375.	How many moles of ammonia weigh 85 g?5
Answer» How many moles of ammonia weigh 85 g? 5

Discussion

7376.	What is the mass ratio of hydrogen to oxygen in a water molecule?
Answer» What is the mass ratio of hydrogen to oxygen in a water molecule?

Discussion

7377.	Question 10 (m) Classify the following into elements, compounds and mixtures. m. Blood
Answer» Question 10 (m) Classify the following into elements, compounds and mixtures. m. Blood

Discussion

7378.	One nm is equal to:
Answer» One nm is equal to:

Discussion

7379.	Find the molecular mass of carbon dioxide (CO2) in a.m.u.44
Answer» Find the molecular mass of carbon dioxide (CO2) in a.m.u. 44

Discussion

7380.	What experimental result did Albert Einstein cite as evidence that light has particle-like properties?
Answer» What experimental result did Albert Einstein cite as evidence that light has particle-like properties?

Discussion

7381.	The solute cannot be separated from solution by filtration
Answer» The solute cannot be separated from solution by filtration

Discussion

7382.	Calcination is a process in which the ore is heated strongly in the absence of air to remove volatile impurities. It thermally decomposes the carbonate. 2Fe2O3.3H2OCalcination−−−−−−−→A+3H2O Find out A:
Answer» Calcination is a process in which the ore is heated strongly in the absence of air to remove volatile impurities. It thermally decomposes the carbonate. $2 F e_{2} O_{3} . 3 H_{2} O C a l c i n a t i o n - ------ \to A + 3 H_{2} O$ Find out $A$ :

Discussion

7383.	No of waves made by e- in Bohr's third orbit in one revolution.?
Answer» No of waves made by e^-in Bohr's third orbit in one revolution.?

Discussion

7384.	What is valency and why does the noble gases does not react with other elements ,please explain
Answer» What is valency and why does the noble gases does not react with other elements ,please explain

Discussion

7385.	Which of the following affect the amount of heat energy transferred to a body?
Answer» Which of the following affect the amount of heat energy transferred to a body?

Discussion

7386.	What are the main points of activity series?
Answer» What are the main points of activity series?

Discussion

7387.	Does radioactive discharge take place only on unstable atoms? If so, then are our atoms unstable because we are also radioactive?
Answer» Does radioactive discharge take place only on unstable atoms? If so, then are our atoms unstable because we are also radioactive?

Discussion

7388.	How will you prove that water is a compound?
Answer» How will you prove that water is a compound?

Discussion

7389.	Principle quantum number directly reflects on
Answer» Principle quantum number directly reflects on

Discussion

7390.	The ratio of e/m for cathode rays
Answer» The ratio of e/m for cathode rays

Discussion

7391.	Why do 3517Cl and 3717Cl have the same chemical properties ? In what respect do these atoms differ ?
Answer» Why do $_{17}^{35} C l a n d_{17}^{37} C l$ have the same chemical properties ? In what respect do these atoms differ ?

Discussion

7392.	The process of change of a liquid into vapour at any temperature is called :
Answer» The process of change of a liquid into vapour at any temperature is called :

Discussion

7393.	The sum of the oxidation numbers of all the carbons in C6H5CHO is
Answer» The sum of the oxidation numbers of all the carbons in $C_{6} H_{5} C H O$ is

Discussion

7394.	Match the following: 1. Chemical changei. Water2. Physical changeii. Sugar in water3. Pure substanceiii. Cooking food4. Homogeneous mixtureiv. Melting of ice
Answer» Match the following: $\begin{matrix} 1. C h e m i c a l c h a n g e & i . W a t e r 2. P h y s i c a l c h a n g e & i i . S u g a r i n w a t e r 3. P u r e s u b s t a n c e & i i i . C o o k i n g f o o d 4. H o m o g e n e o u s m i x t u r e & i v . M e l t i n g o f i c e \end{matrix}$

7394.

Match the following: 1. Chemical changei. Water2. Physical changeii. Sugar in water3. Pure substanceiii. Cooking food4. Homogeneous mixtureiv. Melting of ice

Answer»

Match the following:
$\begin{matrix} 1. C h e m i c a l c h a n g e & i . W a t e r 2. P h y s i c a l c h a n g e & i i . S u g a r i n w a t e r 3. P u r e s u b s t a n c e & i i i . C o o k i n g f o o d 4. H o m o g e n e o u s m i x t u r e & i v . M e l t i n g o f i c e \end{matrix}$

Discussion

7395.	100 mL of water at room temperature of 25∘C is taken in a beaker and a little of solid S is dissolved in it by stirring to obtain a solution X. More and more of solid S is added to the solution with constant stirring while keeping the temperature of solution constant at 30∘C. After some time it is observed that no more solid dissolves in water and at the same time some solid is also left undissolved at the bottom of the beaker. The contents of beaker are filtered through a filter paper to obtain solution Y in the form of a filtrate. (a) What name is given to solutions like X? (b) What name is given to solutions like Y? (c) What will you observe if the solution Y at 30∘C is cooled down to 10∘C by keeping the beaker in crushed ice? Why? (d) What term is used to denote the amount of solid dissolved in 100 grams of water in a solution like Y?
Answer» 100 mL of water at room temperature of $25^{\circ} C$ is taken in a beaker and a little of solid S is dissolved in it by stirring to obtain a solution X. More and more of solid S is added to the solution with constant stirring while keeping the temperature of solution constant at $30^{\circ} C .$ After some time it is observed that no more solid dissolves in water and at the same time some solid is also left undissolved at the bottom of the beaker. The contents of beaker are filtered through a filter paper to obtain solution Y in the form of a filtrate. (a) What name is given to solutions like X? (b) What name is given to solutions like Y? (c) What will you observe if the solution Y at $30^{\circ} C$ is cooled down to $10^{\circ} C$ by keeping the beaker in crushed ice? Why? (d) What term is used to denote the amount of solid dissolved in 100 grams of water in a solution like Y?

7395.

100 mL of water at room temperature of 25∘C is taken in a beaker and a little of solid S is dissolved in it by stirring to obtain a solution X. More and more of solid S is added to the solution with constant stirring while keeping the temperature of solution constant at 30∘C. After some time it is observed that no more solid dissolves in water and at the same time some solid is also left undissolved at the bottom of the beaker. The contents of beaker are filtered through a filter paper to obtain solution Y in the form of a filtrate. (a) What name is given to solutions like X? (b) What name is given to solutions like Y? (c) What will you observe if the solution Y at 30∘C is cooled down to 10∘C by keeping the beaker in crushed ice? Why? (d) What term is used to denote the amount of solid dissolved in 100 grams of water in a solution like Y?

Answer»

100 mL of water at room temperature of $25^{\circ} C$ is taken in a beaker and a little of solid S is dissolved in it by stirring to obtain a solution X. More and more of solid S is added to the solution with constant stirring while keeping the temperature of solution constant at $30^{\circ} C .$ After some time it is observed that no more solid dissolves in water and at the same time some solid is also left undissolved at the bottom of the beaker. The contents of beaker are filtered through a filter paper to obtain solution Y in the form of a filtrate.

(a) What name is given to solutions like X?

(b) What name is given to solutions like Y?

(c) What will you observe if the solution Y at $30^{\circ} C$ is cooled down to $10^{\circ} C$ by keeping the beaker in crushed ice? Why?

(d) What term is used to denote the amount of solid dissolved in 100 grams of water in a solution like Y?

Discussion

7396.	What name is given to those elements which are neither good conductors of electricity like copper nor insulators like sulphur ?
Answer» What name is given to those elements which are neither good conductors of electricity like copper nor insulators like sulphur ?

Discussion

7397.	Why we use 3cm pencil line in paper chromatography?
Answer» Why we use 3cm pencil line in paper chromatography?

Discussion

7398.	Which of the following cations cannot give borax bead test?
Answer» Which of the following cations cannot give borax bead test?

Discussion

7399.	Goldstein's experiments which involved passing high voltage electricity through gases at very low pressure resulted in the discovery of:
Answer» Goldstein's experiments which involved passing high voltage electricity through gases at very low pressure resulted in the discovery of:

Discussion

7400.	Why do different elements exist in different states at the same temperature?
Answer» Why do different elements exist in different states at the same temperature?

Discussion

Explore topic-wise InterviewSolutions in .

The strength of London forces do not increase with the increase in

Give a reason for the following observations. (a) Naphthalene balls disappear with time without leaving any solid. (b) We can get the smell of perfume sitting several meters away. [3 MARKS]

What is octet configuration

Which law governs the relationship between solubility of a gas in a liquid and the pressure exerted by the gas on the surface?

Californium is the member of__________.

The ionic compound Ca(OH)2 on dissociation will give cation X. The charge on this cation is ___.

Find the formula of ammonium sulphate. [3 MARKS]

Is air a homogenous or heterogeneous mixture?

(a) What is meant by (i) elements (ii) compounds, and (iii) mixtures? Write down the names of two elements, two compounds and two mixtures. (b) Classify the following into elements, compounds and mixtures : Marble, Air, Gold, Brass, Sand, Diamond, Graphite, Petroleum, Common salt, Sea-water, Chalk

Define plasma and Bose Einstine Condensate with diagram and examples

What is element and compound?

Calgon is chemically called as ______

How water vapour forms?

How will you recover common salt from salt-water mixture?

During the alpha-particle scattering experiment, which of the following observations is correct for most of the alpha-particles?

Latent heat of fusion and vaporization

Question 7 Name two metals which will displace hydrogen from dilute acids and two metals which will not.

We can easily move our hand in the air but we cannot move our hand through a wooden table. Identify the correct reason for the same.

Which of the following compounds are poor conductors of electricity?

If same weight of liquid water and piece of ice is taken, then why is density of ice less than that of liquid water?

Why is water H2O and not OH2 &amp; NaCl and not ClNa?

Differentiate between isotopes of hydrogen.(3mark)

Blue color X changes to white color Y on heating and when we moisten Y, Blue color X reappers. This is because has some water of crystallisation.

How many moles of ammonia weigh 85 g?5

What is the mass ratio of hydrogen to oxygen in a water molecule?

Question 10 (m) Classify the following into elements, compounds and mixtures. m. Blood

One nm is equal to:

Find the molecular mass of carbon dioxide (CO2) in a.m.u.44

What experimental result did Albert Einstein cite as evidence that light has particle-like properties?

The solute cannot be separated from solution by filtration

Calcination is a process in which the ore is heated strongly in the absence of air to remove volatile impurities. It thermally decomposes the carbonate. 2Fe2O3.3H2OCalcination−−−−−−−→A+3H2O Find out A:

No of waves made by e- in Bohr's third orbit in one revolution.?

What is valency and why does the noble gases does not react with other elements ,please explain

Which of the following affect the amount of heat energy transferred to a body?

What are the main points of activity series?

Does radioactive discharge take place only on unstable atoms? If so, then are our atoms unstable because we are also radioactive?

How will you prove that water is a compound?

Principle quantum number directly reflects on

The ratio of e/m for cathode rays

Why do 3517Cl and 3717Cl have the same chemical properties ? In what respect do these atoms differ ?

The process of change of a liquid into vapour at any temperature is called :

The sum of the oxidation numbers of all the carbons in C6H5CHO is

Match the following: 1. Chemical changei. Water2. Physical changeii. Sugar in water3. Pure substanceiii. Cooking food4. Homogeneous mixtureiv. Melting of ice

What name is given to those elements which are neither good conductors of electricity like copper nor insulators like sulphur ?

Why we use 3cm pencil line in paper chromatography?

Which of the following cations cannot give borax bead test?

Goldstein's experiments which involved passing high voltage electricity through gases at very low pressure resulted in the discovery of:

Why do different elements exist in different states at the same temperature?

Why is water H2O and not OH2 & NaCl and not ClNa?