10223 + Interview Questions in Chemistry Page 131 InterviewSolution

6501.	Sir I am Shaun job of class 9. I have a doubt regarding chemistry on the topic the structure of the atom This is the question, Is the gas used inside the discharge tube a gas of low density? Thank you sir Shaun
Answer» Sir I am Shaun job of class 9. I have a doubt regarding chemistry on the topic the structure of the atom This is the question, Is the gas used inside the discharge tube a gas of low density? Thank you sir Shaun

Discussion

6502.	Decantation
Answer» Decantation

Discussion

6503.	Which of the following should be used as a disinfectant?
Answer» Which of the following should be used as a disinfectant?

Discussion

6504.	What is the difference between collid and collidial solution
Answer» What is the difference between collid and collidial solution

Discussion

6505.	Fill in the blank with the correct connector. Sweetmeats were prepared in honour of their famous guest. __________, the walls and floors of the house were scrubbed clean.
Answer» Fill in the blank with the correct connector. Sweetmeats were prepared in honour of their famous guest. __________, the walls and floors of the house were scrubbed clean.

6505.

Fill in the blank with the correct connector. Sweetmeats were prepared in honour of their famous guest. __________, the walls and floors of the house were scrubbed clean.

Answer»

Fill in the blank with the correct connector.

Sweetmeats were prepared in honour of their famous guest. __________, the walls and floors of the house were scrubbed clean.

Discussion

6506.	Dear sir, Pls. help me with the below question. 20 cm^3 of alcohol is dissolved in 80 cm^3 of water. Calculate the % of alcohol in the solution. Thank you
Answer» Dear sir, Pls. help me with the below question. 20 cm^3 of alcohol is dissolved in 80 cm^3 of water. Calculate the % of alcohol in the solution. Thank you

6506.

Dear sir, Pls. help me with the below question. 20 cm^3 of alcohol is dissolved in 80 cm^3 of water. Calculate the % of alcohol in the solution. Thank you

Answer»

Dear sir,

Pls. help me with the below question.

20 cm^3 of alcohol is dissolved in 80 cm^3 of water. Calculate the % of alcohol in the solution.

Thank you

Discussion

6507.	Question 1 (h) Classify the following as chemical or physical changes: h. Burning of paper and wood
Answer» Question 1 (h) Classify the following as chemical or physical changes: h. Burning of paper and wood

Discussion

6508.	Question 12 (d) Give reason why carbonate and sulphide ores are usually converted into oxides during the process of extraction.
Answer» Question 12 (d) Give reason why carbonate and sulphide ores are usually converted into oxides during the process of extraction.

Discussion

6509.	How many electrons can be present in one single bond between two atoms?
Answer» How many electrons can be present in one single bond between two atoms?

Discussion

6510.	The atomic numbers of Al, Na and Be respectively are:
Answer» The atomic numbers of Al, Na and Be respectively are:

Discussion

6511.	Name the process you would use to separate a mixture of two miscible liquids (like acetone and water).
Answer» Name the process you would use to separate a mixture of two miscible liquids (like acetone and water).

Discussion

6512.	In which of these cases will H2 gas be produced?
Answer» In which of these cases will $H_{2}$ gas be produced?

Discussion

6513.	Ram and Rahul bought a packet of candies. The packet contains candies of different colours. Rahul is fine with any colour but Ram wants only red colour candies. What method should Ram use in order to pick red colour candies?
Answer» Ram and Rahul bought a packet of candies. The packet contains candies of different colours. Rahul is fine with any colour but Ram wants only red colour candies. What method should Ram use in order to pick red colour candies?

Discussion

6514.	What are subatomic particles?
Answer» What are subatomic particles?

Discussion

6515.	Arrange the following items on the basis of intermolecular force of attraction.
Answer» Arrange the following items on the basis of intermolecular force of attraction.

6515.

Arrange the following items on the basis of intermolecular force of attraction.

Answer»

Arrange the following items on the basis of intermolecular force of attraction.

Discussion

6516.	If solution X has a pH of 6. Then X is:
Answer» If solution X has a pH of 6. Then X is:

Discussion

6517.	Give the composition, causes and affects of acid rain.
Answer» Give the composition, causes and affects of acid rain.

Discussion

6518.	What is nitrites? Explain with example.
Answer» What is nitrites? Explain with example.

6518.

What is nitrites? Explain with example.

Answer»

What is nitrites?

Explain with example.

Discussion

6519.	The electronic configuration of calcium is 2,8,8,2. So why we can't write it as 2,8,9,1?
Answer» The electronic configuration of calcium is 2,8,8,2. So why we can't write it as 2,8,9,1?

Discussion

6520.	How many types of salts are their
Answer» How many types of salts are their

Discussion

6521.	Addition of iron or zinc to copper sulphate results in precipitation of copper owing to
Answer» Addition of iron or zinc to copper sulphate results in precipitation of copper owing to

Discussion

6522.	Which of the following are the physical properties of nitric acid?
Answer» Which of the following are the physical properties of nitric acid?

Discussion

6523.	Write the condition required for chromatography.
Answer» Write the condition required for chromatography.

Discussion

6524.	The radius of an oxygen atom is 0.073 nm. What does the symbol 'nm' represent?
Answer» The radius of an oxygen atom is 0.073 nm. What does the symbol 'nm' represent?

Discussion

6525.	A sample of drinking water was found to be severely contaminated with chloroform (CHCl3). Supposed to be carcinogenic in nature. The level of contamination was 15 ppm (by mass). (i) Express this in percentage by mass. (ii) Determine the molality of chloroform in the water sample.
Answer» A sample of drinking water was found to be severely contaminated with chloroform (CHCl₃). Supposed to be carcinogenic in nature. The level of contamination was 15 ppm (by mass). (i) Express this in percentage by mass. (ii) Determine the molality of chloroform in the water sample.

6525.

A sample of drinking water was found to be severely contaminated with chloroform (CHCl3). Supposed to be carcinogenic in nature. The level of contamination was 15 ppm (by mass). (i) Express this in percentage by mass. (ii) Determine the molality of chloroform in the water sample.

Answer»

A sample of drinking water was found to be severely contaminated with chloroform (CHCl₃). Supposed to be carcinogenic in nature. The level of contamination was 15 ppm (by mass).

(i) Express this in percentage by mass.

(ii) Determine the molality of chloroform in the water sample.

Discussion

6526.	The partial charges present on an atom are
Answer» The partial charges present on an atom are

Discussion

6527.	Which mixture is incorrectly labelled?
Answer» Which mixture is incorrectly labelled?

Discussion

6528.	The first and second dissociation constant of an acid H2A are 1.0×10−5 and 5.0×10−10 respectively. The overall dissociation constant of the acid will be:
Answer» The first and second dissociation constant of an acid $H_{2} A$ are $1.0 \times 10^{- 5}$ and $5.0 \times 10^{- 10}$ respectively. The overall dissociation constant of the acid will be:

Discussion

6529.	The number of atoms present in 4.25 grams of NH3 is approximately
Answer» The number of atoms present in $4.25 g r a m s$ of $N H_{3}$ is approximately

Discussion

6530.	Which of the following is not an element? (a) Graphite (b) Germanium (c) Silica (d) Silicon
Answer» Which of the following is not an element? (a) Graphite (b) Germanium (c) Silica (d) Silicon

6530.

Which of the following is not an element? (a) Graphite (b) Germanium (c) Silica (d) Silicon

Answer»

Which of the following is not an element?

(a) Graphite (b) Germanium (c) Silica (d) Silicon

Discussion

6531.	Calculate the average atomic mass of chlorine.
Answer» Calculate the average atomic mass of chlorine.

Discussion

6532.	__ is the amount of moisture in air.
Answer» __ is the amount of moisture in air.

Discussion

6533.	(a) State Charles's law. (b) Give its (i) graphical representation, (ii) mathematical expresssion and (iii) significance.
Answer» (a) State Charles's law. (b) Give its (i) graphical representation, (ii) mathematical expresssion and (iii) significance.

Discussion

6534.	Why is hot concentrated Sulphuric acid not used in the preparation of Hydrogen ?
Answer» Why is hot concentrated Sulphuric acid not used in the preparation of Hydrogen ?

Discussion

6535.	The number of molecules in 34.0g of NH3 is ____.
Answer» The number of molecules in 34.0g of $N H_{3}$ is ____.

Discussion

6536.	What are the physical states of dispersed phase and dispersion medium of a fog?
Answer» What are the physical states of dispersed phase and dispersion medium of a fog?

Discussion

6537.	How will you separate a mixture of iron filings and powdered carbon?
Answer» How will you separate a mixture of iron filings and powdered carbon?

Discussion

6538.	What is the percentage of oxygen present in the atmosphere?
Answer» What is the percentage of oxygen present in the atmosphere?

Discussion

6539.	How is water purified on a large scale at waterworks? Explain with the help of a labelled diagram. Name the substance which is added to kill germs in the drinking water supply?
Answer» How is water purified on a large scale at waterworks? Explain with the help of a labelled diagram. Name the substance which is added to kill germs in the drinking water supply?

Discussion

6540.	Calculate the mass per cent of calcium, phosphorus and oxygen in calcium phosphate Ca3(PO4)2.
Answer» Calculate the mass per cent of calcium, phosphorus and oxygen in calcium phosphate $C a_{3} (P O_{4})_{2}$ .

Discussion

6541.	When salt is added to water and stirred, the salt particles disappear and we get a clear salt solution. Give reasons.
Answer» When salt is added to water and stirred, the salt particles disappear and we get a clear salt solution. Give reasons.

Discussion

6542.	How will you convert Kelvin into Celsius?
Answer» How will you convert Kelvin into Celsius?

Discussion

6543.	What is suspension? plz clear it out. ..it is looking so difficult???
Answer» What is suspension? plz clear it out. ..it is looking so difficult???

Discussion

6544.	What is the opposite word of sublimation?
Answer» What is the opposite word of sublimation?

Discussion

6545.	According to Arrhenius, acids release ____ ions in the aqueous solution.
Answer» According to Arrhenius, acids release ____ ions in the aqueous solution.

Discussion

6546.	The total number of valence electrons in 4.2 gm of N3− ion is (NA is the Avogadro's number )
Answer» The total number of valence electrons in 4.2 gm of ${N_{3}}^{-}$ ion is ( $N_{A}$ is the Avogadro's number )

Discussion

6547.	Which scientist discovered the radioactive element radium?
Answer» Which scientist discovered the radioactive element radium?

Discussion

6548.	Give an equation for reaction of ammonical cuprous chloride with ethyne
Answer» Give an equation for reaction of ammonical cuprous chloride with ethyne

Discussion

6549.	Identify the structure of C6H6.
Answer» Identify the structure of C₆H_6.

Discussion

6550.	Evaporation occurs at the surface of a liquid because the particles at the surface:
Answer» Evaporation occurs at the surface of a liquid because the particles at the surface:

Discussion

Explore topic-wise InterviewSolutions in .

Sir I am Shaun job of class 9. I have a doubt regarding chemistry on the topic the structure of the atom This is the question, Is the gas used inside the discharge tube a gas of low density? Thank you sir Shaun

Decantation

Which of the following should be used as a disinfectant?

What is the difference between collid and collidial solution

Fill in the blank with the correct connector. Sweetmeats were prepared in honour of their famous guest. __________, the walls and floors of the house were scrubbed clean.

Dear sir, Pls. help me with the below question. 20 cm^3 of alcohol is dissolved in 80 cm^3 of water. Calculate the % of alcohol in the solution. Thank you

Question 1 (h) Classify the following as chemical or physical changes: h. Burning of paper and wood

Question 12 (d) Give reason why carbonate and sulphide ores are usually converted into oxides during the process of extraction.

How many electrons can be present in one single bond between two atoms?

The atomic numbers of Al, Na and Be respectively are:

Name the process you would use to separate a mixture of two miscible liquids (like acetone and water).

In which of these cases will H2 gas be produced?

Ram and Rahul bought a packet of candies. The packet contains candies of different colours. Rahul is fine with any colour but Ram wants only red colour candies. What method should Ram use in order to pick red colour candies?

What are subatomic particles?

Arrange the following items on the basis of intermolecular force of attraction.

If solution X has a pH of 6. Then X is:

Give the composition, causes and affects of acid rain.

What is nitrites? Explain with example.

The electronic configuration of calcium is 2,8,8,2. So why we can't write it as 2,8,9,1?

How many types of salts are their

Addition of iron or zinc to copper sulphate results in precipitation of copper owing to

Which of the following are the physical properties of nitric acid?

Write the condition required for chromatography.

The radius of an oxygen atom is 0.073 nm. What does the symbol 'nm' represent?

A sample of drinking water was found to be severely contaminated with chloroform (CHCl3). Supposed to be carcinogenic in nature. The level of contamination was 15 ppm (by mass). (i) Express this in percentage by mass. (ii) Determine the molality of chloroform in the water sample.

The partial charges present on an atom are

Which mixture is incorrectly labelled?

The first and second dissociation constant of an acid H2A are 1.0×10−5 and 5.0×10−10 respectively. The overall dissociation constant of the acid will be:

The number of atoms present in 4.25 grams of NH3 is approximately

Which of the following is not an element? (a) Graphite (b) Germanium (c) Silica (d) Silicon

Calculate the average atomic mass of chlorine.

__ is the amount of moisture in air.

(a) State Charles's law. (b) Give its (i) graphical representation, (ii) mathematical expresssion and (iii) significance.

Why is hot concentrated Sulphuric acid not used in the preparation of Hydrogen ?

The number of molecules in 34.0g of NH3 is ____.

What are the physical states of dispersed phase and dispersion medium of a fog?

How will you separate a mixture of iron filings and powdered carbon?

What is the percentage of oxygen present in the atmosphere?

How is water purified on a large scale at waterworks? Explain with the help of a labelled diagram. Name the substance which is added to kill germs in the drinking water supply?

Calculate the mass per cent of calcium, phosphorus and oxygen in calcium phosphate Ca3(PO4)2.

When salt is added to water and stirred, the salt particles disappear and we get a clear salt solution. Give reasons.

How will you convert Kelvin into Celsius?

What is suspension? plz clear it out. ..it is looking so difficult???

What is the opposite word of sublimation?

According to Arrhenius, acids release ____ ions in the aqueous solution.

The total number of valence electrons in 4.2 gm of N3− ion is (NA is the Avogadro's number )

Which scientist discovered the radioactive element radium?

Give an equation for reaction of ammonical cuprous chloride with ethyne

Identify the structure of C6H6.

Evaporation occurs at the surface of a liquid because the particles at the surface: