5083 + Interview Questions in Chemistry Page 43 InterviewSolution

2101.	Name the most appropriate method of removing tea leaves after preparing tea. Define it. [1 MARK]
Answer» Name the most appropriate method of removing tea leaves after preparing tea. Define it. [1 MARK]

2101.

Name the most appropriate method of removing tea leaves after preparing tea. Define it. [1 MARK]

Answer»

Name the most appropriate method of removing tea leaves after preparing tea. Define it. [1 MARK]

2102.	Write the electronic configuration of the element having atomic number 26,also predict the period,group and block of that element.
Answer» Write the electronic configuration of the element having atomic number 26,also predict the period,group and block of that element.

Discussion

2103.	Name two substances that are responsible for hardness of water.
Answer» Name two substances that are responsible for hardness of water.

Discussion

2104.	Which of the following is used to disinfect water?
Answer» Which of the following is used to disinfect water?

Discussion

2105.	In a reaction, the unit of both rate constant and rate of the reaction are same. So, the order of the reaction is:
Answer» In a reaction, the unit of both rate constant and rate of the reaction are same. So, the order of the reaction is:

Discussion

2106.	Three liquids are given to you. One is hydrochloric acid, another is sodium hydroxide and third is a sugar solution. How will you identify them? You have only turmeric indicator
Answer» Three liquids are given to you. One is hydrochloric acid, another is sodium hydroxide and third is a sugar solution. How will you identify them? You have only turmeric indicator

Discussion

2107.	The valancies of the constituent elements' chemical formula are same on every formula. But variable valancies are different for example if iron and sulpher have different valency how will I understand which valency I should use for finding out the formula
Answer» The valancies of the constituent elements' chemical formula are same on every formula. But variable valancies are different for example if iron and sulpher have different valency how will I understand which valency I should use for finding out the formula

Discussion

2108.	A container contains gaseous mixture of O2 and CO2 having volume of 550 ml NTP and mass of 1 g . Volume of O2 in the mixture is
Answer» A container contains gaseous mixture of O2 and CO2 having volume of 550 ml NTP and mass of 1 g . Volume of O2 in the mixture is

Discussion

2109.	the atomic mass of an element is 19.the second shell of its atom contains 7 electrons.the number of protons in its nucleus is
Answer» the atomic mass of an element is 19.the second shell of its atom contains 7 electrons.the number of protons in its nucleus is

Discussion

2110.	Rashid went to an oil refinery and there he saw that crude oil is separated by various methods. Which of the following is the most suitable method to separate the components of crude oil?
Answer» Rashid went to an oil refinery and there he saw that crude oil is separated by various methods. Which of the following is the most suitable method to separate the components of crude oil?

2110.

Rashid went to an oil refinery and there he saw that crude oil is separated by various methods. Which of the following is the most suitable method to separate the components of crude oil?

Answer»

Rashid went to an oil refinery and there he saw that crude oil is separated by various methods. Which of the following is the most suitable method to separate the components of crude oil?

Discussion

2111.	Woolen yarn is made up of
Answer» Woolen yarn is made up of

Discussion

2112.	What do we understand by miscibility?
Answer» What do we understand by miscibility?

Discussion

2113.	Is chocolate an acid or a base? How much pH does it have?
Answer» Is chocolate an acid or a base? How much pH does it have?

Discussion

2114.	Question 13Silver articles become black on prolonged exposure to air. This is due to the formation of:(a) Ag3N(b) Ag2O(c) Ag2S(d) Ag2S and Ag3N
Answer» Question 13 Silver articles become black on prolonged exposure to air. This is due to the formation of: (a) ${Ag}_{3} N$ (b) ${Ag}_{2} O$ (c) ${Ag}_{2} S$ (d) ${Ag}_{2} S$ and ${Ag}_{3} N$

Discussion

2115.	Answer the following question:(a) What happens when a dilute acid reacts with a metal oxide? Explain with the help of an example.(b) Do metal oxides react with bases too? If yes, give an example.
Answer» Answer the following question: (a) What happens when a dilute acid reacts with a metal oxide? Explain with the help of an example. (b) Do metal oxides react with bases too? If yes, give an example.

Discussion

2116.	An oxide of metal M 40% by mass of oxygen. Metal M has atomic mass 24. The emperical formula of oxide
Answer» An oxide of metal M 40% by mass of oxygen. Metal M has atomic mass 24. The emperical formula of oxide

Discussion

2117.	Identify the example of a molecule of an element from the following options.
Answer» Identify the example of a molecule of an element from the following options.

Discussion

2118.	The total number of valence electrons in 4.2g N3- ion is
Answer» The total number of valence electrons in 4.2g N3- ion is

Discussion

2119.	What is nitriding of iron in metallurgy?
Answer» What is nitriding of iron in metallurgy?

Discussion

2120.	According the law of definite proportion a given chemical compound always contains its component elements in fixed ratio (by mass) . But if we get the proportion in percentage and the percentage differs by one to two percent. Is it still valid
Answer» According the law of definite proportion a given chemical compound always contains its component elements in fixed ratio (by mass) . But if we get the proportion in percentage and the percentage differs by one to two percent. Is it still valid

Discussion

2121.	What do you mean by sewage?
Answer» What do you mean by sewage?

Discussion

2122.	Why can't electrons flow through salt bridge in an electrochemical cell?
Answer» Why can't electrons flow through salt bridge in an electrochemical cell?

Discussion

2123.	Which theory has provided an explanation for the law of conservation of mass and the law of definite proportions?
Answer» Which theory has provided an explanation for the law of conservation of mass and the law of definite proportions?

Discussion

2124.	What is the difference between displacement and double displacement reaction? Write equations for these reactions.
Answer» What is the difference between displacement and double displacement reaction? Write equations for these reactions.

Discussion

2125.	The order of energies of energy levels A, B and C is EA<EB<EC. If the wavelength corresponding to transition C →B, B →A and C →A are λ1, λ2 and λ3 respectively, then which of the following relation is correct ?
Answer» The order of energies of energy levels $A, B$ and $C$ is $E_{A} < E_{B} < E_{C}$ . If the wavelength corresponding to transition $C \to B, B \to A and C \to A are λ_{1}, λ_{2} and λ_{3}$ respectively, then which of the following relation is correct ?

Discussion

2126.	Why the forest is a 'dynamic living entity'? [3 MARKS]
Answer» Why the forest is a 'dynamic living entity'? [3 MARKS]

Discussion

2127.	8 For the reaction A+2B=C+D,the equilibrium constant is 1.010to the power-8. a) calculate the equilibrium constant of A if 1.0 mole of A and 3.0 mole of B are placed in a 1.0L vessel and allowed to come in equilibrium. b) If 1.0 mole of C and 3.0mole of D were placed in a 1.0L vessel, calculate the equilibrium concentration of B.
Answer» 8 For the reaction A+2B=C+D,the equilibrium constant is 1.010to the power-8. a) calculate the equilibrium constant of A if 1.0 mole of A and 3.0 mole of B are placed in a 1.0L vessel and allowed to come in equilibrium. b) If 1.0 mole of C and 3.0mole of D were placed in a 1.0L vessel, calculate the equilibrium concentration of B.

Discussion

2128.	Difference between respiration and combustion
Answer» Difference between respiration and combustion

Discussion

2129.	Question 3 (a)Synthetic fibres are also called ________or _________fibres.
Answer» Question 3 (a) Synthetic fibres are also called ________or _________fibres.

Discussion

2130.	ntConsider a compound slab consisting of two different materials having equal thickness and thermal conductivities K and 2K respectively.The equivalent thermal conductivity of the slab isn nta)3K b)4/3K c)2/3K d)sqrt2 Kn
Answer» ntConsider a compound slab consisting of two different materials having equal thickness and thermal conductivities K and 2K respectively.The equivalent thermal conductivity of the slab isn nta)3K b)4/3K c)2/3K d)sqrt2 Kn

Discussion

2131.	is the mixture of iron and sulphur a homogeneous or heterogeneous mixture ?
Answer» is the mixture of iron and sulphur a homogeneous or heterogeneous mixture ?

Discussion

2132.	How can we separate a mixture of sand and sugar? Explain.
Answer» How can we separate a mixture of sand and sugar? Explain.

Discussion

2133.	Aspirin is ___________
Answer» Aspirin is ___________

Discussion

2134.	Epsom salt refers to:
Answer» Epsom salt refers to:

Discussion

2135.	Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution? Explain.
Answer» Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution? Explain.

Discussion

2136.	What happens when it rains heavily on soil without a vegetational cover?
Answer» What happens when it rains heavily on soil without a vegetational cover?

Discussion

2137.	What will happen when leaves of plants are exposed to dust and pollution?
Answer» What will happen when leaves of plants are exposed to dust and pollution?

Discussion

2138.	(a) What happens when an acid reacts with a metal carbonate? Explain with the help of an example. Write chemical equation of the reaction involved.(b) What happens when carbon dioxide gas is passed through lime water:(i) for a short time?(ii) for a considerable long time?Write equations of the reactions involved.
Answer» (a) What happens when an acid reacts with a metal carbonate? Explain with the help of an example. Write chemical equation of the reaction involved. (b) What happens when carbon dioxide gas is passed through lime water: (i) for a short time? (ii) for a considerable long time? Write equations of the reactions involved.

2138.

(a) What happens when an acid reacts with a metal carbonate? Explain with the help of an example. Write chemical equation of the reaction involved.(b) What happens when carbon dioxide gas is passed through lime water:(i) for a short time?(ii) for a considerable long time?Write equations of the reactions involved.

Answer»

(a) What happens when an acid reacts with a metal carbonate? Explain with the help of an example. Write chemical equation of the reaction involved.

(b) What happens when carbon dioxide gas is passed through lime water:

(i) for a short time?

(ii) for a considerable long time?

Write equations of the reactions involved.

Discussion

2139.	Which are the different useful compounds of carbon?
Answer» Which are the different useful compounds of carbon?

Discussion

2140.	For the following reaction : Initial concentration : 10 mol/L 2mol/L 2A + B = product t_{1/2} of the overall reaction is the time when a)half f A changes to product b)half of B changes to product c) 6 moles of A and B changes to product d) none of these
Answer» For the following reaction : Initial concentration : 10 mol/L 2mol/L 2A + B = product t_{1/2} of the overall reaction is the time when a)half f A changes to product b)half of B changes to product c) 6 moles of A and B changes to product d) none of these

Discussion

2141.	Question 1(b) Classify the changes involved in the following processes as physical or chemical changes: Dissolving sugar in water
Answer» Question 1(b) Classify the changes involved in the following processes as physical or chemical changes: Dissolving sugar in water

Discussion

2142.	Identify the marked part A in the picture given below.
Answer» Identify the marked part A in the picture given below.

Discussion

2143.	You are provided with three test tubes containing sugar solution, baking soda solution and tamarind solution. Explain how can you identify the nature of each of these solutions using litmus paper.
Answer» You are provided with three test tubes containing sugar solution, baking soda solution and tamarind solution. Explain how can you identify the nature of each of these solutions using litmus paper.

Discussion

2144.	Latent heat of ice is 80 cal/g. A man melts 60g of ice by chewing in 1 minute. His power is
Answer» Latent heat of ice is 80 cal/g. A man melts 60g of ice by chewing in 1 minute. His power is

Discussion

2145.	All the organisms of the same species living in a particular locality are called as __________.
Answer» All the organisms of the same species living in a particular locality are called as __________.

2145.

All the organisms of the same species living in a particular locality are called as __________.

Answer»

All the organisms of the same species living in a particular locality are called as __________.

Discussion

2146.	20 g of an impure sample of calcium carbonate decomposes on heating to give 8.4 g of calcium oxide.What is percentage purity of calcium carbonate sample(at.wt.of Ca=40)a)60 b)75c)85 d)95
Answer» 20 g of an impure sample of calcium carbonate decomposes on heating to give 8.4 g of calcium oxide.What is percentage purity of calcium carbonate sample(at.wt.of Ca=40) a)60 b)75 c)85 d)95

Discussion

2147.	Which of the following is correct about fire? Fire is -
Answer» Which of the following is correct about fire? Fire is -

2147.

Which of the following is correct about fire? Fire is -

Answer»

Which of the following is correct about fire?

Fire is -

Discussion

2148.	The pH of a solution is found to be 5.5. What is the nature of the solution?
Answer» The pH of a solution is found to be 5.5. What is the nature of the solution?

Discussion

2149.	Name the change as seen in image.
Answer» Name the change as seen in image.

2149.

Name the change as seen in image.

Answer»

Name the change as seen in image.

Discussion

2150.	Sheela cooked rice in a rice cooker. What kind of change took place?(i) irreversible change(ii) Slow change(iii) natural change
Answer» Sheela cooked rice in a rice cooker. What kind of change took place? (i) irreversible change (ii) Slow change (iii) natural change

Discussion

Explore topic-wise InterviewSolutions in .

Name the most appropriate method of removing tea leaves after preparing tea. Define it. [1 MARK]

Write the electronic configuration of the element having atomic number 26,also predict the period,group and block of that element.

Name two substances that are responsible for hardness of water.

Which of the following is used to disinfect water?

In a reaction, the unit of both rate constant and rate of the reaction are same. So, the order of the reaction is:

Three liquids are given to you. One is hydrochloric acid, another is sodium hydroxide and third is a sugar solution. How will you identify them? You have only turmeric indicator

The valancies of the constituent elements' chemical formula are same on every formula. But variable valancies are different for example if iron and sulpher have different valency how will I understand which valency I should use for finding out the formula

A container contains gaseous mixture of O2 and CO2 having volume of 550 ml NTP and mass of 1 g . Volume of O2 in the mixture is

the atomic mass of an element is 19.the second shell of its atom contains 7 electrons.the number of protons in its nucleus is

Rashid went to an oil refinery and there he saw that crude oil is separated by various methods. Which of the following is the most suitable method to separate the components of crude oil?

Woolen yarn is made up of

What do we understand by miscibility?

Is chocolate an acid or a base? How much pH does it have?

Question 13Silver articles become black on prolonged exposure to air. This is due to the formation of:(a) Ag3N(b) Ag2O(c) Ag2S(d) Ag2S and Ag3N

Answer the following question:(a) What happens when a dilute acid reacts with a metal oxide? Explain with the help of an example.(b) Do metal oxides react with bases too? If yes, give an example.

An oxide of metal M 40% by mass of oxygen. Metal M has atomic mass 24. The emperical formula of oxide

Identify the example of a molecule of an element from the following options.

The total number of valence electrons in 4.2g N3- ion is

What is nitriding of iron in metallurgy?

According the law of definite proportion a given chemical compound always contains its component elements in fixed ratio (by mass) . But if we get the proportion in percentage and the percentage differs by one to two percent. Is it still valid

What do you mean by sewage?

Why can't electrons flow through salt bridge in an electrochemical cell?

Which theory has provided an explanation for the law of conservation of mass and the law of definite proportions?

What is the difference between displacement and double displacement reaction? Write equations for these reactions.

The order of energies of energy levels A, B and C is EA&lt;EB&lt;EC. If the wavelength corresponding to transition C →B, B →A and C →A are λ1, λ2 and λ3 respectively, then which of the following relation is correct ?

Why the forest is a 'dynamic living entity'? [3 MARKS]

Difference between respiration and combustion

Question 3 (a)Synthetic fibres are also called ________or _________fibres.

ntConsider a compound slab consisting of two different materials having equal thickness and thermal conductivities K and 2K respectively.The equivalent thermal conductivity of the slab isn nta)3K b)4/3K c)2/3K d)sqrt2 Kn

is the mixture of iron and sulphur a homogeneous or heterogeneous mixture ?

How can we separate a mixture of sand and sugar? Explain.

Aspirin is ___________

Epsom salt refers to:

Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution? Explain.

What happens when it rains heavily on soil without a vegetational cover?

What will happen when leaves of plants are exposed to dust and pollution?

Which are the different useful compounds of carbon?

For the following reaction : Initial concentration : 10 mol/L 2mol/L 2A + B = product t_{1/2} of the overall reaction is the time when a)half f A changes to product b)half of B changes to product c) 6 moles of A and B changes to product d) none of these

Question 1(b) Classify the changes involved in the following processes as physical or chemical changes: Dissolving sugar in water

Identify the marked part A in the picture given below.

You are provided with three test tubes containing sugar solution, baking soda solution and tamarind solution. Explain how can you identify the nature of each of these solutions using litmus paper.

Latent heat of ice is 80 cal/g. A man melts 60g of ice by chewing in 1 minute. His power is

All the organisms of the same species living in a particular locality are called as __________.

20 g of an impure sample of calcium carbonate decomposes on heating to give 8.4 g of calcium oxide.What is percentage purity of calcium carbonate sample(at.wt.of Ca=40)a)60 b)75c)85 d)95

Which of the following is correct about fire? Fire is -

The pH of a solution is found to be 5.5. What is the nature of the solution?

Name the change as seen in image.

Sheela cooked rice in a rice cooker. What kind of change took place?(i) irreversible change(ii) Slow change(iii) natural change

The order of energies of energy levels A, B and C is EA<EB<EC. If the wavelength corresponding to transition C →B, B →A and C →A are λ1, λ2 and λ3 respectively, then which of the following relation is correct ?

Question 3 (a)Synthetic fibres are also called or _fibres.