7248 + Interview Questions in Chemistry Page 5 InterviewSolution

201.	Why water's ratio is 1:8??
Answer» Why water's ratio is 1:8??

Discussion

202.	Why a element is taken as standard massWhy can't we determine a atomic mass without a standard mass of element??Also why C-12 is taken as standard ??why not any other element
Answer» Why a element is taken as standard mass Why can't we determine a atomic mass without a standard mass of element?? Also why C-12 is taken as standard ??why not any other element

Discussion

203.

(क) सही जगह पर (✓) का निशान लगाओ। नारियल आम केला सबसे घना सबसे ऊँचा चढ़ने में सबसे आसान सबसे मोटा तना सबसे बड़े पत्ते सबसे मीठा फल फल खाना सबसे आसान

Answer»

(क) सही जगह पर (✓) का निशान लगाओ।

	नारियल	आम	केला
सबसे घना
सबसे ऊँचा
चढ़ने में सबसे आसान
सबसे मोटा तना
सबसे बड़े पत्ते
सबसे मीठा फल
फल खाना सबसे आसान

Discussion

204.	50kJ of energy is consumed in 2.5s. Find the power in a unit of horse power.
Answer» $50kJ$ of energy is consumed in $2.5s$ . Find the power in a unit of horse power.

Discussion

205.	Is there any fabric which allows air to pass through it (or its breathable)but not water?
Answer» Is there any fabric which allows air to pass through it (or its breathable)but not water?

Discussion

206.	Sunlight and air are inexhaustible natural resources. Comment.
Answer» Sunlight and air are inexhaustible natural resources. Comment.

Discussion

207.

Boojho wants to separate the following materials as combustible and non-combustible. Can you help him? Charcoal, chalk, stone, iron rod, copper coin, straw, cardboard, glass, paper, candle, wood.

Answer» Boojho wants to separate the following materials as combustible and non-combustible. Can you help him?

Charcoal, chalk, stone, iron rod, copper coin, straw, cardboard, glass, paper, candle, wood.

Discussion

208.	What are the all types of bond
Answer» What are the all types of bond

Discussion

209.	Differentiate between thermosetting plastics and thermoplastics using examples.
Answer» Differentiate between thermosetting plastics and thermoplastics using examples.

Discussion

210.	Explain the formation of scum when hard water is treated with soap.
Answer» Explain the formation of scum when hard water is treated with soap.

Discussion

211.	Wood is a domestic fuel with a low calorific value, it is used in paper as well as pulp factories. Which of the following do you think can be manufactured using wood?
Answer» Wood is a domestic fuel with a low calorific value, it is used in paper as well as pulp factories. Which of the following do you think can be manufactured using wood?

211.

Wood is a domestic fuel with a low calorific value, it is used in paper as well as pulp factories. Which of the following do you think can be manufactured using wood?

Answer»

Wood is a domestic fuel with a low calorific value, it is used in paper as well as pulp factories. Which of the following do you think can be manufactured using wood?

Discussion

212.	24.How do particles of suspension and colloid scatter a beam of light and make it's path visible?
Answer» 24.How do particles of suspension and colloid scatter a beam of light and make it's path visible?

Discussion

213.	Which of the following is/are involved in a chemical reaction?
Answer» Which of the following is/are involved in a chemical reaction?

Discussion

214.	is any reaction neither endothermic nor exothermic?
Answer» is any reaction neither endothermic nor exothermic?

Discussion

215.	Write answer to the following question in your own words.(a) How are the components of mixtures separated by simple methods ?(b) Which elements ( metals and non-metals), compounds and mixtures do we use in our day-to-day life?(c) In everyday life, where and for what purpose do we use centrifugation?(d) Where are the methods of separation by distillation and by separating funnel used ? Why ?(e) Which precaution will you take while using the methods of distillation and separation by separating funnel ?
Answer» Write answer to the following question in your own words. (a) How are the components of mixtures separated by simple methods ? (b) Which elements ( metals and non-metals), compounds and mixtures do we use in our day-to-day life? (c) In everyday life, where and for what purpose do we use centrifugation? (d) Where are the methods of separation by distillation and by separating funnel used ? Why ? (e) Which precaution will you take while using the methods of distillation and separation by separating funnel ?

Discussion

216.	Make a labelled diagram of a candle flame.
Answer» Make a labelled diagram of a candle flame.

Discussion

217.	while writing the definition of oxidation and reduction, we have to follow modern or the old concept of redox?
Answer» while writing the definition of oxidation and reduction, we have to follow modern or the old concept of redox?

Discussion

218.	Aluminium is extracted from alumina (Al2O3) by electrolysis of a molten mixture of:[1 Mark]
Answer» Aluminium is extracted from alumina $(A l_{2} O_{3})$ by electrolysis of a molten mixture of: [1 Mark]

Discussion

219.	Why iron have two different valencies
Answer» Why iron have two different valencies

Discussion

220.	Considering Ellingham diagram, which of the following metals can be used to reduce alumina?
Answer» Considering Ellingham diagram, which of the following metals can be used to reduce alumina?

Discussion

221.	Few properties are mentioned below. Specify the property as mixture or compound: STATEMENT 1: The constituents can be separated easily by physical means. STATEMENT 2: Has a variable composition. STATEMENT 3: Has a fixed melting and boiling point. STATEMENT 4: Shows entirely different properties from constituent elements.
Answer» Few properties are mentioned below. Specify the property as mixture or compound: STATEMENT 1: The constituents can be separated easily by physical means. STATEMENT 2: Has a variable composition. STATEMENT 3: Has a fixed melting and boiling point. STATEMENT 4: Shows entirely different properties from constituent elements.

221.

Few properties are mentioned below. Specify the property as mixture or compound: STATEMENT 1: The constituents can be separated easily by physical means. STATEMENT 2: Has a variable composition. STATEMENT 3: Has a fixed melting and boiling point. STATEMENT 4: Shows entirely different properties from constituent elements.

Answer»

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

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

STATEMENT 2: Has a variable composition.

STATEMENT 3: Has a fixed melting and boiling point.

STATEMENT 4: Shows entirely different properties from constituent elements.

Discussion

222.	A lady went to the market to buy a blanket. The shopkeeper showed her blankets made up of acrylic fibres as well as made up of wool. She preferred to buy an acrylic blanket. Can you guess why?
Answer» A lady went to the market to buy a blanket. The shopkeeper showed her blankets made up of acrylic fibres as well as made up of wool. She preferred to buy an acrylic blanket. Can you guess why?

Discussion

223.	Which of the following is not a crystalline allotropic form of carbon?
Answer» Which of the following is not a crystalline allotropic form of carbon?

Discussion

224.	Which among the following is correctly represented?
Answer» Which among the following is correctly represented?

Discussion

225.	By a surface of a liquid we mean(a) a geometrical plane like x=0(b) all molecules exposed to the atmosphere(c) a layer of thickness of the order of 10 m(d) a layer of thickness of the order of 10tm.
Answer» By a surface of a liquid we mean(a) a geometrical plane like x=0(b) all molecules exposed to the atmosphere(c) a layer of thickness of the order of 10 m(d) a layer of thickness of the order of 10tm.

Discussion

226.	A student has done the labelling for the experimental set-up for separating a mixture of sodium chloride and camphor as indicated in the diagram given here. The parts/substances that have been incorrectly labelled are :(1) I, III, VIII (2) II, III, VII(3) I, II, VIII(4) III, V, VII
Answer» A student has done the labelling for the experimental set-up for separating a mixture of sodium chloride and camphor as indicated in the diagram given here. The parts/substances that have been incorrectly labelled are : (1) I, III, VIII (2) II, III, VII (3) I, II, VIII (4) III, V, VII

Discussion

227.	What is Volatile components?
Answer» What is Volatile components?

Discussion

228.	How to find vanthoff factor of a compound?
Answer» How to find vanthoff factor of a compound?

Discussion

229.	Question 22 (v) Fill in the blanks (v) A plastic used for making crockery is ___ .
Answer» Question 22 (v) Fill in the blanks (v) A plastic used for making crockery is ___ .

Discussion

230.	Is water that is completely free of all solid and dissolved impurities necessarily potable? Give reasons.
Answer» Is water that is completely free of all solid and dissolved impurities necessarily potable? Give reasons.

Discussion

231.	Why aren't the four products obtained when we heat coal in the presence of air? Why are they obtained only when we heat it in absence of air (distructive distillation)?
Answer» Why aren't the four products obtained when we heat coal in the presence of air? Why are they obtained only when we heat it in absence of air (distructive distillation)?

Discussion

232.	what is polar and non polar solvents?? why is water a polar solvent?
Answer» what is polar and non polar solvents?? why is water a polar solvent?

Discussion

233.	The appearance of lilac colour In KCL crystals is due to
Answer» The appearance of lilac colour In KCL crystals is due to

Discussion

234.	Question 43On adding a drop of barium chloride solution to an aqueous solution of sodium sulphite, white precipitate is obtained.(a) Write a balanced chemical equation of the reaction involved.(b) What other name can be given to this precipitation reaction?(c) On adding dilute hydrochloric acid to the reaction mixture, white precipitate disappears. Why?
Answer» Question 43 On adding a drop of barium chloride solution to an aqueous solution of sodium sulphite, white precipitate is obtained. (a) Write a balanced chemical equation of the reaction involved. (b) What other name can be given to this precipitation reaction? (c) On adding dilute hydrochloric acid to the reaction mixture, white precipitate disappears. Why?

234.

Question 43On adding a drop of barium chloride solution to an aqueous solution of sodium sulphite, white precipitate is obtained.(a) Write a balanced chemical equation of the reaction involved.(b) What other name can be given to this precipitation reaction?(c) On adding dilute hydrochloric acid to the reaction mixture, white precipitate disappears. Why?

Answer»

Question 43

On adding a drop of barium chloride solution to an aqueous solution of sodium sulphite, white precipitate is obtained.

(a) Write a balanced chemical equation of the reaction involved.

(b) What other name can be given to this precipitation reaction?

(c) On adding dilute hydrochloric acid to the reaction mixture, white precipitate disappears. Why?

Discussion

235.	Which of the following are ionic compounds?
Answer» Which of the following are ionic compounds?

Discussion

236.	range of 1/2cosx - 1
Answer» range of 1/2cosx - 1

Discussion

237.	What is standard reduction potential and why do alkali metals behave as strong reducing agents?
Answer» What is standard reduction potential and why do alkali metals behave as strong reducing agents?

Discussion

238.	In a given reaction; Ag(CN)−2⇌Ag++2CN−, the equilibrium constant at 25∘C is 4.0×10−19, then the silver ion concentration in a solution which was originally 0.1 M in KCN and 0.03 M in AgNO3 is:
Answer» In a given reaction; $A g (C N)_{2}^{-} ⇌ A g^{+} + 2 C N^{-}$ , the equilibrium constant at $25^{\circ} C$ is $4.0 \times 10^{- 19}$ , then the silver ion concentration in a solution which was originally $0.1 M$ in $K C N$ and $0.03 M$ in $A g N O_{3}$ is:

Discussion

239.	Greenish layer appears on the copper utensils if they are not cleaned for a few days. Give reason. [2 MARKS]
Answer» Greenish layer appears on the copper utensils if they are not cleaned for a few days. Give reason. [2 MARKS]

Discussion

240.	What is the shape of the molecule SF2Cl2
Answer» What is the shape of the molecule SF2Cl2

Discussion

241.	Question 1Among Zinc, Phosphorus, Sulphur, and Oxygen which can be beaten into thin sheets?
Answer» Question 1 Among Zinc, Phosphorus, Sulphur, and Oxygen which can be beaten into thin sheets?

Discussion

242.	Can the structure of NaCl be called as an antifluorite structure?
Answer» Can the structure of NaCl be called as an antifluorite structure?

Discussion

243.	An alloy is an example of a
Answer» An alloy is an example of a

Discussion

244.	The synthetic fibre used in the production of following products is:
Answer» The synthetic fibre used in the production of following products is:

Discussion

245.	If an air bubble of radius102m is rising up at a steady rate of 2 x103m/sec through a liquid of density 1.5 x103kg/m3, then the coefficient of viscosity of the liquid in MKS unit(neglecting the density of air will be)?
Answer» If an air bubble of radius102m is rising up at a steady rate of 2 x103m/sec through a liquid of density 1.5 x103kg/m3, then the coefficient of viscosity of the liquid in MKS unit(neglecting the density of air will be)?

Discussion

246.	In Rutherford scattering experiment, what will be the scattering angle for an α particle for an impact parameter b=0 ?
Answer» In Rutherford scattering experiment, what will be the scattering angle for an $α$ particle for an impact parameter $b = 0$ ?

Discussion

247.	Phosphorus is highly inflammable; in a matchstick, it ignites by:
Answer» Phosphorus is highly inflammable; in a matchstick, it ignites by:

Discussion

248.	Diazonium salt
Answer» Diazonium salt

Discussion

249.	39. Why we use fire extinguisher for extinguish fire while fire extinguisher release oxygen that oxygen is essential for burning
Answer» 39. Why we use fire extinguisher for extinguish fire while fire extinguisher release oxygen that oxygen is essential for burning

Discussion

250.	why oil is not capable to mix with water?
Answer» why oil is not capable to mix with water?

Discussion

Explore topic-wise InterviewSolutions in .

Why water's ratio is 1:8??

Why a element is taken as standard massWhy can't we determine a atomic mass without a standard mass of element??Also why C-12 is taken as standard ??why not any other element

50kJ of energy is consumed in 2.5s. Find the power in a unit of horse power.

Is there any fabric which allows air to pass through it (or its breathable)but not water?

Sunlight and air are inexhaustible natural resources. Comment.​

Boojho wants to separate the following materials as combustible and non-combustible. Can you help him? ​ Charcoal, chalk, stone, iron rod, copper coin, straw, cardboard, glass, paper, candle, wood.​

What are the all types of bond

Differentiate between thermosetting plastics and thermoplastics using examples.

Explain the formation of scum when hard water is treated with soap.

Wood is a domestic fuel with a low calorific value, it is used in paper as well as pulp factories. Which of the following do you think can be manufactured using wood?

24.How do particles of suspension and colloid scatter a beam of light and make it's path visible?

Which of the following is/are involved in a chemical reaction?

is any reaction neither endothermic nor exothermic?

Make a labelled diagram of a candle flame.

while writing the definition of oxidation and reduction, we have to follow modern or the old concept of redox?

Aluminium is extracted from alumina (Al2O3) by electrolysis of a molten mixture of:[1 Mark]

Why iron have two different valencies

Considering Ellingham diagram, which of the following metals can be used to reduce alumina?

A lady went to the market to buy a blanket. The shopkeeper showed her blankets made up of acrylic fibres as well as made up of wool. She preferred to buy an acrylic blanket. Can you guess why?

Which of the following is not a crystalline allotropic form of carbon?

Which among the following is correctly represented?

By a surface of a liquid we mean(a) a geometrical plane like x=0(b) all molecules exposed to the atmosphere(c) a layer of thickness of the order of 10 m(d) a layer of thickness of the order of 10tm.

A student has done the labelling for the experimental set-up for separating a mixture of sodium chloride and camphor as indicated in the diagram given here. The parts/substances that have been incorrectly labelled are :(1) I, III, VIII (2) II, III, VII(3) I, II, VIII(4) III, V, VII

What is Volatile components?

How to find vanthoff factor of a compound?

Question 22 (v) Fill in the blanks (v) A plastic used for making crockery is ___ .

Is water that is completely free of all solid and dissolved impurities necessarily potable? Give reasons.

Why aren't the four products obtained when we heat coal in the presence of air? Why are they obtained only when we heat it in absence of air (distructive distillation)?

what is polar and non polar solvents?? why is water a polar solvent?

The appearance of lilac colour In KCL crystals is due to

Which of the following are ionic compounds?

range of 1/2cosx - 1

What is standard reduction potential and why do alkali metals behave as strong reducing agents?

In a given reaction; Ag(CN)−2⇌Ag++2CN−, the equilibrium constant at 25∘C is 4.0×10−19, then the silver ion concentration in a solution which was originally 0.1 M in KCN and 0.03 M in AgNO3 is:

Greenish layer appears on the copper utensils if they are not cleaned for a few days. Give reason. [2 MARKS]

What is the shape of the molecule SF2Cl2

Question 1Among Zinc, Phosphorus, Sulphur, and Oxygen which can be beaten into thin sheets?

Can the structure of NaCl be called as an antifluorite structure?

An alloy is an example of a

The synthetic fibre used in the production of following products is:

If an air bubble of radius102m is rising up at a steady rate of 2 x103m/sec through a liquid of density 1.5 x103kg/m3, then the coefficient of viscosity of the liquid in MKS unit(neglecting the density of air will be)?

In Rutherford scattering experiment, what will be the scattering angle for an α particle for an impact parameter b=0 ?

Phosphorus is highly inflammable; in a matchstick, it ignites by:

Diazonium salt

39. Why we use fire extinguisher for extinguish fire while fire extinguisher release oxygen that oxygen is essential for burning

why oil is not capable to mix with water?

Sunlight and air are inexhaustible natural resources. Comment.

Boojho wants to separate the following materials as combustible and non-combustible. Can you help him? Charcoal, chalk, stone, iron rod, copper coin, straw, cardboard, glass, paper, candle, wood.