5083 + Interview Questions in Chemistry Page 31 InterviewSolution

1501.	Question 32Fill in the missing data in the Table 3.1Species propertyH2OCO2Na−atomMgCl2Number of moles2−−0.5Number of particles−3.011×1023−−Mass36 g−115 g−
Answer» Question 32 Fill in the missing data in the Table 3.1 $\begin{matrix} S p e c i e s p r o p e r t y & H_{2} O & C O_{2} & N a - a t o m & M g C l_{2} N u m b e r o f m o l e s & 2 & - & - & 0.5 N u m b e r o f p a r t i c l e s & - & 3.011 \times 10^{23} & - & - M a s s & 36 g & - & 115 g & - \end{matrix}$

Discussion

1502.	What is burrs?
Answer» What is burrs?

Discussion

1503.	A student was given four unknown solutions in test-tubes marked A, B, C and D and asked to test them with universal indicator solution. He observed that on putting universal indicator solution, the solutions A, B, C and D turned blue, orange, green and red respectively. The test-tube which contains sodium chloride solution is :(1) A(2) B(3) C(4) D
Answer» A student was given four unknown solutions in test-tubes marked A, B, C and D and asked to test them with universal indicator solution. He observed that on putting universal indicator solution, the solutions A, B, C and D turned blue, orange, green and red respectively. The test-tube which contains sodium chloride solution is : (1) A (2) B (3) C (4) D

Discussion

1504.	Question 12Write one equation each for decomposition reactions where energy is supplied in the form of heat, light or electricity.
Answer» Question 12 Write one equation each for decomposition reactions where energy is supplied in the form of heat, light or electricity.

Discussion

1505.	What is the chemical formula of cellulose?
Answer» What is the chemical formula of cellulose?

Discussion

1506.	Question 1: germination of seeds is considered a dash change .
Answer» Question 1: germination of seeds is considered a dash change .

Discussion

1507.	1.what planing must farmers do for proper sheep rearing? 2.what suggestions would you give to workers of silk industry in order to overcome the health hazard? 3.what are the important characteristics of silk that makes it a comfortable clothe to wear?
Answer» 1.what planing must farmers do for proper sheep rearing? 2.what suggestions would you give to workers of silk industry in order to overcome the health hazard? 3.what are the important characteristics of silk that makes it a comfortable clothe to wear?

1507.

1.what planing must farmers do for proper sheep rearing? 2.what suggestions would you give to workers of silk industry in order to overcome the health hazard? 3.what are the important characteristics of silk that makes it a comfortable clothe to wear?

Answer»

1.what planing must farmers do for proper sheep rearing?

2.what suggestions would you give to workers of silk industry in order to overcome the health hazard?

3.what are the important characteristics of silk that makes it a comfortable clothe to wear?

Discussion

1508.	Which of the following ion(s) are released when hard water reacts with soap?
Answer» Which of the following ion(s) are released when hard water reacts with soap?

Discussion

1509.	What is radical?
Answer» What is radical?

Discussion

1510.	Does Concentration of Cu2+ ions remains same in electrolysis of CuSO4 using Cu electrode?
Answer» Does Concentration of Cu2+ ions remains same in electrolysis of CuSO4 using Cu electrode?

Discussion

1511.	Identify the polyatomic ions from the following.
Answer» Identify the polyatomic ions from the following.

Discussion

1512.	Bases change blue litmus to red.
Answer» Bases change blue litmus to red.

Discussion

1513.	why not to write H2o directly in equation instead of writing aqueous in the equatio
Answer» why not to write H2o directly in equation instead of writing aqueous in the equatio

Discussion

1514.	Question 44Fill in the blanks(a) In a chemical reaction, the sum of the masses of the reactants and products remains unchanged. This is called ___.(b) A group of atoms carrying a fixed charge on them is called ___.(c) The formula unit mass of Ca3(PO4)2 is ____.(d) Formula of sodium carbonate is ___ and that of ammonium sulphate is ____.
Answer» Question 44 Fill in the blanks (a) In a chemical reaction, the sum of the masses of the reactants and products remains unchanged. This is called ___. (b) A group of atoms carrying a fixed charge on them is called ___. (c) The formula unit mass of $C a_{3} (P O_{4})_{2}$ is ____. (d) Formula of sodium carbonate is ___ and that of ammonium sulphate is ____.

Discussion

1515.	For a given reaction, energy of activation for forward reaction(Eaf) is 80 kJ mol−1. Enthalpy change, ΔH=−40 kJ mol−1 for the reaction. A catalyst lowers Eaf to 20 kJmol−1. The ratio of energy of activation for reverse reaction before and after addition of catalyst is:
Answer» For a given reaction, energy of activation for forward reaction $(E_{a f})$ is $80 k J m o l^{- 1}$ . Enthalpy change, $Δ H = - 40 k J m o l^{- 1}$ for the reaction. A catalyst lowers $E_{a f}$ to $20 k J$ $m o l^{- 1}$ . The ratio of energy of activation for reverse reaction before and after addition of catalyst is:

Discussion

1516.	The temperature of the two outer surfaces of a composite slab, consisting of two materials having coefficients of thermal conductivity K and 2K, thickness x and 4x respectively, are T2 and T1 (T2>T1). Area of cross-section A is the same. The rate of heat transfer through the slab, in steady state, is F[A(T2−T1)Kx]. The value of F is (answer up to two decimal places)
Answer» The temperature of the two outer surfaces of a composite slab, consisting of two materials having coefficients of thermal conductivity $K$ and $2 K$ , thickness $x$ and $4 x$ respectively, are $T_{2}$ and $T_{1} (T_{2} > T_{1})$ . Area of cross-section $A$ is the same. The rate of heat transfer through the slab, in steady state, is $F [\frac{A (T_{2} - T_{1}) K}{x}]$ . The value of $F$ is (answer up to two decimal places)

Discussion

1517.	The usage of LPG in rural areas should be promoted because
Answer» The usage of LPG in rural areas should be promoted because

Discussion

1518.	9.Why fireflies glow at night?
Answer» 9.Why fireflies glow at night?

Discussion

1519.	In chromatography how do we know if a substance is pure ?
Answer» In chromatography how do we know if a substance is pure ?

Discussion

1520.	categorise the following function of time : cos^3wt asa) S.H.M b) periodic but not S.H.M . also find the period
Answer» categorise the following function of time : cos^3wt as a) S.H.M b) periodic but not S.H.M . also find the period

Discussion

1521.	What should be the value of x (coefficient of H2O)?a C6H12O6+b O2→c CO2+x H2O
Answer» What should be the value of x (coefficient of $H_{2} O$ )? $a C_{6} H_{12} O_{6} + b O_{2} \to c C O_{2} + x H_{2} O$

1521.

What should be the value of x (coefficient of H2O)?a C6H12O6+b O2→c CO2+x H2O

Answer»

What should be the value of x (coefficient of $H_{2} O$ )?

$a C_{6} H_{12} O_{6} + b O_{2} \to c C O_{2} + x H_{2} O$

Discussion

1522.	Which of the following factors affect the type of industrial waste produced?
Answer» Which of the following factors affect the type of industrial waste produced?

Discussion

1523.	Each layer of the soil is different in its texture, colour, depth and chemical composition. These layers collectively are known as ___ .
Answer» Each layer of the soil is different in its texture, colour, depth and chemical composition. These layers collectively are known as ___ .

Discussion

1524.	as we states that in water bodies and other sources of water there a mix of oxygen . so is there oxygen in drinking water
Answer» as we states that in water bodies and other sources of water there a mix of oxygen . so is there oxygen in drinking water

Discussion

1525.	What is the difference between atomic mass and formula mass and how to decide which one to use
Answer» What is the difference between atomic mass and formula mass and how to decide which one to use

Discussion

1526.

Match thewords of Column I with those given in Column II: Column I Column II (i) Scouring (a) Yields silk fibres (ii) Mulberry leaves (b) Wool yielding animal (iii) Yak (c) Food of silk worm (iv) Cocoon (d) Reeling (e) Cleaning sheared skin

Answer»

Match the
words of Column I with those given in Column II:

	Column I		Column II
(i)	Scouring	(a)	Yields silk fibres
(ii)	Mulberry leaves	(b)	Wool yielding animal
(iii)	Yak	(c)	Food of silk worm
(iv)	Cocoon	(d)	Reeling
		(e)	Cleaning sheared skin

Discussion

1527.	Which colored surface is formed when silver gets corroded?
Answer» Which colored surface is formed when silver gets corroded?

Discussion

1528.	Question 4 Silk fibre is obtained from (a) fleece of sheep (b) cotton ball (c) cocoon (d) shiny jute stalk
Answer» Question 4 Silk fibre is obtained from (a) fleece of sheep (b) cotton ball (c) cocoon (d) shiny jute stalk

1528.

Question 4 Silk fibre is obtained from (a) fleece of sheep (b) cotton ball (c) cocoon (d) shiny jute stalk

Answer»

Question 4

Silk fibre is obtained from
(a) fleece of sheep
(b) cotton ball
(c) cocoon
(d) shiny jute stalk

Discussion

1529.	Whenever a bottle of perfume is opened in a corner, we can identify its smell all over the room. So, what can we infer from this?
Answer» Whenever a bottle of perfume is opened in a corner, we can identify its smell all over the room. So, what can we infer from this?

Discussion

1530.	State whether the following statement is True or False:Sulphur is an element, air is a compound and steam is a mixture.
Answer» State whether the following statement is True or False: Sulphur is an element, air is a compound and steam is a mixture.

Discussion

1531.	Test some cold drinks, particularly soda, and determine whether it is acidic or basic.
Answer» Test some cold drinks, particularly soda, and determine whether it is acidic or basic.

Discussion

1532.	why is formation of ammonia is termed as a chemical change though it is revesi
Answer» why is formation of ammonia is termed as a chemical change though it is revesi

Discussion

1533.	Use am or have in the blanks.Disclaimer: Kindly refer the textbook for the image.P { margin-bottom: 0.21cm; }I ____ white in colour.I ____ two eyes.I ____four legs and a short tail.I ____ wool on me.What ___ I?
Answer» Use am or have in the blanks. Disclaimer: Kindly refer the textbook for the image. I ____ white in colour. I ____ two eyes. I ____four legs and a short tail. I ____ wool on me. What ___ I?

1533.

Use am or have in the blanks.Disclaimer: Kindly refer the textbook for the image.P { margin-bottom: 0.21cm; }I __ white in colour.I two eyes.I four legs and a short tail.I wool on me.What _ I?

Answer» Use am or have in the blanks.

Disclaimer: Kindly refer the textbook for the image.

I ____ white in colour.

I ____ two eyes.

I ____four legs and a short tail.

I ____ wool on me.

What ___ I?

Discussion

1534.	After the completion of the dyeing process, the fibres are _________ into yarn.
Answer» After the completion of the dyeing process, the fibres are _________ into yarn.

Discussion

1535.	What is fibroin? what is sericin ?
Answer» What is fibroin? what is sericin ?

Discussion

1536.	What is a neutralization reaction? Give two examples.
Answer» What is a neutralization reaction? Give two examples.

Discussion

1537.	What is mobile phase (in paper chromatography)?
Answer» What is mobile phase (in paper chromatography)?

Discussion

1538.	At a particular temperature, the ratio of equivalent conductance to specific conductance of a 0.01 N NaCl solution is:
Answer» At a particular temperature, the ratio of equivalent conductance to specific conductance of a $0.01 N N a C l$ solution is:

Discussion

1539.	Explain the two types of propellant.
Answer» Explain the two types of propellant.

Discussion

1540.	Water rises in the beaker during Lavoisier’s experiment due to which phenomenon?
Answer» Water rises in the beaker during Lavoisier’s experiment due to which phenomenon?

Discussion

1541.	define atomic mass unit
Answer» define atomic mass unit

Discussion

1542.	What are co-ordinate compounds?
Answer» What are co-ordinate compounds?

Discussion

1543.	In a cell , the following reaction takes place:Fe(s)+CuSO4(aq)→FeSO4(aq)+Cu(s)The correct cell representation is:
Answer» In a cell , the following reaction takes place: $F e (s) + C u S O_{4} (a q) \to F e S O_{4} (a q) + C u (s)$ The correct cell representation is:

Discussion

1544.	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

1545.	Identify A in the given figure:
Answer» Identify A in the given figure:

1545.

Identify A in the given figure:

Answer»

Identify A in the given figure:

Discussion

1546.	Faster and smarter way to learn valency of elements and radical
Answer» Faster and smarter way to learn valency of elements and radical

Discussion

1547.	Pick the odd one out.
Answer» Pick the odd one out.

Discussion

1548.	The half life period of a first order reaction is 1 min 40 seconds. Calculate its rate constant.
Answer» The half life period of a first order reaction is 1 min 40 seconds. Calculate its rate constant.

Discussion

1549.	How many litre of oxygen at STP is required to burn 60g of C2H6
Answer» How many litre of oxygen at STP is required to burn 60g of C2H6

Discussion

1550.	a given length of a wire is doubled on itself and this process is repeated once again by what factor does the resistance of the wire change
Answer» a given length of a wire is doubled on itself and this process is repeated once again by what factor does the resistance of the wire change

Discussion

Explore topic-wise InterviewSolutions in .

Question 32Fill in the missing data in the Table 3.1Species propertyH2OCO2Na−atomMgCl2Number of moles2−−0.5Number of particles−3.011×1023−−Mass36 g−115 g−

What is burrs?

Question 12Write one equation each for decomposition reactions where energy is supplied in the form of heat, light or electricity.

What is the chemical formula of cellulose?

Question 1: germination of seeds is considered a dash change .

1.what planing must farmers do for proper sheep rearing? 2.what suggestions would you give to workers of silk industry in order to overcome the health hazard? 3.what are the important characteristics of silk that makes it a comfortable clothe to wear?

Which of the following ion(s) are released when hard water reacts with soap?

What is radical?

Does Concentration of Cu2+ ions remains same in electrolysis of CuSO4 using Cu electrode?

Identify the polyatomic ions from the following.

Bases change blue litmus to red.

why not to write H2o directly in equation instead of writing aqueous in the equatio

For a given reaction, energy of activation for forward reaction(Eaf) is 80 kJ mol−1. Enthalpy change, ΔH=−40 kJ mol−1 for the reaction. A catalyst lowers Eaf to 20 kJmol−1. The ratio of energy of activation for reverse reaction before and after addition of catalyst is:

The usage of LPG in rural areas should be promoted because

9.Why fireflies glow at night?

In chromatography how do we know if a substance is pure ?

categorise the following function of time : cos^3wt asa) S.H.M b) periodic but not S.H.M . also find the period

What should be the value of x (coefficient of H2O)?a C6H12O6+b O2→c CO2+x H2O

Which of the following factors affect the type of industrial waste produced?

Each layer of the soil is different in its texture, colour, depth and chemical composition. These layers collectively are known as ___ .

as we states that in water bodies and other sources of water there a mix of oxygen . so is there oxygen in drinking water

What is the difference between atomic mass and formula mass and how to decide which one to use

Match thewords of Column I with those given in Column II: Column I Column II (i) Scouring (a) Yields silk fibres (ii) Mulberry leaves (b) Wool yielding animal (iii) Yak (c) Food of silk worm (iv) Cocoon (d) Reeling (e) Cleaning sheared skin

Which colored surface is formed when silver gets corroded?

Question 4 Silk fibre is obtained from (a) fleece of sheep (b) cotton ball (c) cocoon (d) shiny jute stalk

Whenever a bottle of perfume is opened in a corner, we can identify its smell all over the room. So, what can we infer from this?

State whether the following statement is True or False:Sulphur is an element, air is a compound and steam is a mixture.

Test some cold drinks, particularly soda, and determine whether it is acidic or basic.

why is formation of ammonia is termed as a chemical change though it is revesi

Use am or have in the blanks.Disclaimer: Kindly refer the textbook for the image.P { margin-bottom: 0.21cm; }I ____ white in colour.I ____ two eyes.I ____four legs and a short tail.I ____ wool on me.What ___ I?

After the completion of the dyeing process, the fibres are _________ into yarn.

What is fibroin? what is sericin ?

What is a neutralization reaction? Give two examples.

What is mobile phase (in paper chromatography)?

At a particular temperature, the ratio of equivalent conductance to specific conductance of a 0.01 N NaCl solution is:

Explain the two types of propellant.

Water rises in the beaker during Lavoisier’s experiment due to which phenomenon?

define atomic mass unit

What are co-ordinate compounds?

In a cell , the following reaction takes place:Fe(s)+CuSO4(aq)→FeSO4(aq)+Cu(s)The correct cell representation is:

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.

Identify A in the given figure:

Faster and smarter way to learn valency of elements and radical

Pick the odd one out.

The half life period of a first order reaction is 1 min 40 seconds. Calculate its rate constant.

How many litre of oxygen at STP is required to burn 60g of C2H6

a given length of a wire is doubled on itself and this process is repeated once again by what factor does the resistance of the wire change

Use am or have in the blanks.Disclaimer: Kindly refer the textbook for the image.P { margin-bottom: 0.21cm; }I __ white in colour.I two eyes.I four legs and a short tail.I wool on me.What _ I?