5083 + Interview Questions in Chemistry Page 35 InterviewSolution

1701.	Which worm among the following is used to decompose the human excreta?
Answer» Which worm among the following is used to decompose the human excreta?

Discussion

1702.	Question 46What is the role of metal or reagents written on arrows inthegiven chemical reactions?
Answer» Question 46 What is the role of metal or reagents written on arrows inthegiven chemical reactions?

Discussion

1703.	The total number of steps involved in making clothes from fibres is ________.7
Answer» The total number of steps involved in making clothes from fibres is ________. 7

Discussion

1704.	Choose the statements from the following, regarding salt:Statement 1: All salts are formed by the reaction of HCl and NaOHStatement 2: Salts are formed by the neutralization of acids and bases.Statement 3: Salts are ionic compoundsStatement 4: Salts are composed of cations and anionsStatement 5: Salts are always white in colourStatement 6: NaCl is called as common salt Statement 7: pH of common salt is 7
Answer» Choose the statements from the following, regarding salt: Statement 1: All salts are formed by the reaction of HCl and NaOH Statement 2: Salts are formed by the neutralization of acids and bases. Statement 3: Salts are ionic compounds Statement 4: Salts are composed of cations and anions Statement 5: Salts are always white in colour Statement 6: NaCl is called as common salt Statement 7: pH of common salt is 7

1704.

Choose the statements from the following, regarding salt:Statement 1: All salts are formed by the reaction of HCl and NaOHStatement 2: Salts are formed by the neutralization of acids and bases.Statement 3: Salts are ionic compoundsStatement 4: Salts are composed of cations and anionsStatement 5: Salts are always white in colourStatement 6: NaCl is called as common salt Statement 7: pH of common salt is 7

Answer»

Choose the statements from the following, regarding salt:

Statement 1: All salts are formed by the reaction of HCl and NaOH

Statement 2: Salts are formed by the neutralization of acids and bases.

Statement 3: Salts are ionic compounds

Statement 4: Salts are composed of cations and anions

Statement 5: Salts are always white in colour

Statement 6: NaCl is called as common salt

Statement 7: pH of common salt is 7

Discussion

1705.	19. The rate of reaction between two reactants A and B decrease by a factor of 4 ,if the concentration of reactant B is double. The order of this reaction with respect to reactant B is 1) -1 2) -2 3) 1 4) 2
Answer» 19. The rate of reaction between two reactants A and B decrease by a factor of 4 ,if the concentration of reactant B is double. The order of this reaction with respect to reactant B is 1) -1 2) -2 3) 1 4) 2

Discussion

1706.	Select right expression for determining packing fraction (P.F.) of NaCl unit cell (assume ideal), if ions along an body diagonal are absent:
Answer» Select right expression for determining packing fraction (P.F.) of $N a C l$ unit cell (assume ideal), if ions along an body diagonal are absent:

Discussion

1707.	Is the ozone an odd electron molecule ?OR Is the ozone formed or contain an by odd electron bond??
Answer» Is the ozone an odd electron molecule ?OR Is the ozone formed or contain an by odd electron bond??

Discussion

1708.	How many electrons are in the third shell of a chlorine atom?
Answer» How many electrons are in the third shell of a chlorine atom?

Discussion

1709.	Question 34Under which category of mixtures will you classify alloys and why? (a) A solution is always a liquid. Comment. (b) Can a solution be heterogeneous?
Answer» Question 34 Under which category of mixtures will you classify alloys and why? (a) A solution is always a liquid. Comment. (b) Can a solution be heterogeneous?

Discussion

1710.	Which are the side effects of acid rain?
Answer» Which are the side effects of acid rain?

Discussion

1711.	How to make a soap
Answer» How to make a soap

Discussion

1712.	What are indicators? How are they classified?
Answer» What are indicators? How are they classified?

Discussion

1713.	Why is soil erosion relatively less in dense forests as compared to barren, open fields?
Answer» Why is soil erosion relatively less in dense forests as compared to barren, open fields?

Discussion

1714.	In a first order reaction the concentration of reactant decreases from 800 mol/dm3 to 50 mol/dm3 in 2×104 sec. The rate constant of the reaction in sec−1 is:
Answer» In a first order reaction the concentration of reactant decreases from $800 {mol/dm}^{3}$ to $50 {mol/dm}^{3}$ in $2 \times 10^{4} sec$ . The rate constant of the reaction in ${sec}^{- 1}$ is:

Discussion

1715.	Two 1st order reactions having same reactant concentrations proceed at 25oC at the same rate. The temperature coefficient of the rate of the first is 2 and that of second reaction is 3. Find the ratio of the rates of these reactions at 75oC.
Answer» Two $1^{s t}$ order reactions having same reactant concentrations proceed at $25^{o} C$ at the same rate. The temperature coefficient of the rate of the first is 2 and that of second reaction is 3. Find the ratio of the rates of these reactions at $75^{o} C .$

Discussion

1716.	What is hydrogen ion?
Answer» What is hydrogen ion?

Discussion

1717.	The deposit of calcium carbonate in the boiler is a bad conductor of heat.These deposits of calcium carbonate is stone like and is called ___ .
Answer» The deposit of calcium carbonate in the boiler is a bad conductor of heat.These deposits of calcium carbonate is stone like and is called ___ .

Discussion

1718.	A solution undergoes several colour changes over a wide range of pH. What is the solution called?
Answer» A solution undergoes several colour changes over a wide range of pH. What is the solution called?

Discussion

1719.	When the strip of pH paper was put in a given solution, the pH paper changed to orange red. The given solution is most likely to be of :(1) sodium hydroxide(2) hydrochloric acid(3) sodium bicarbonate (4) ethanoic acid
Answer» When the strip of pH paper was put in a given solution, the pH paper changed to orange red. The given solution is most likely to be of : (1) sodium hydroxide (2) hydrochloric acid (3) sodium bicarbonate (4) ethanoic acid

Discussion

1720.	Which of the following is not an example of fibre?
Answer» Which of the following is not an example of fibre?

Discussion

1721.	Three liquids are given to you. One is hydrochloric acid, another is sodium hydroxide and the third is a sugar solution. How will you identify them? You have only a turmeric indicator.
Answer» Three liquids are given to you. One is hydrochloric acid, another is sodium hydroxide and the third is a sugar solution. How will you identify them? You have only a turmeric indicator.

Discussion

1722.	How do we get coloured fabrics?
Answer» How do we get coloured fabrics?

Discussion

1723.	Question 5List any three human activities that you think would lead to air pollution.
Answer» Question 5 List any three human activities that you think would lead to air pollution.

Discussion

1724.	What are adhering junction? Explain with diagram.
Answer» What are adhering junction? Explain with diagram.

Discussion

1725.	All elements in the third period have(1) Three complete shells(2) Three complete subshells(3) Three valence electrons(4) Three electrons less than octet and How
Answer» All elements in the third period have(1) Three complete shells(2) Three complete subshells(3) Three valence electrons(4) Three electrons less than octet and How

Discussion

1726.	Feasibility of quantum number kya hoti hai
Answer» Feasibility of quantum number kya hoti hai

Discussion

1727.	Which of these is/are valency/valencies of iron?
Answer» Which of these is/are valency/valencies of iron?

Discussion

1728.	what are indicators name all the types of indicators and the detailed definition like natural indicators synthetic indicators olfactory indicators and universal indicators also the formula for the pneumonic of VIBGYOR remembering the nature of acid strong,weak or mild
Answer» what are indicators name all the types of indicators and the detailed definition like natural indicators synthetic indicators olfactory indicators and universal indicators also the formula for the pneumonic of VIBGYOR remembering the nature of acid strong,weak or mild

Discussion

1729.	50. What are the no. of carbon atom per unit cell of diamond?
Answer» 50. What are the no. of carbon atom per unit cell of diamond?

Discussion

1730.	Is we can say that air is also a matter? If yes, Why? If no, why?
Answer» Is we can say that air is also a matter? If yes, Why? If no, why?

Discussion

1731.	Why does vanadium have the highest heat of atomization?
Answer» Why does vanadium have the highest heat of atomization?

Discussion

1732.	How rearing of the silkworm is done? How is it different from reeling?
Answer» How rearing of the silkworm is done? How is it different from reeling?

Discussion

1733.	The process of separation of material by passing direct electric current through the solution is known as ____
Answer» The process of separation of material by passing direct electric current through the solution is known as ____

Discussion

1734.	In the given figure the potential difference V has been plotted against current type of a metallic conductor at the two different temperatures at 25 degree Celsius and Undertaker services respectively the temperature coefficient of resistivity of the year is
Answer» In the given figure the potential difference V has been plotted against current type of a metallic conductor at the two different temperatures at 25 degree Celsius and Undertaker services respectively the temperature coefficient of resistivity of the year is

Discussion

1735.	What are group Valencies or Common Valencies? How are they calculated?
Answer» What are group Valencies or Common Valencies? How are they calculated?

Discussion

1736.	Impure black coloured solution of acetic acid is added to activated charcoal and is heated for a while. The colour of acetic acid changes to its purest form as the impurities are absorbed by activated charcoal. Which of the following characteristics of coal absorbs the impurity?
Answer» Impure black coloured solution of acetic acid is added to activated charcoal and is heated for a while. The colour of acetic acid changes to its purest form as the impurities are absorbed by activated charcoal. Which of the following characteristics of coal absorbs the impurity?

Discussion

1737.	What is the shape of the gas in cylindrical can of deodorant?
Answer» What is the shape of the gas in cylindrical can of deodorant?

Discussion

1738.	The density of a cube is measured by measuring its length and mass. If the maximum error in the measurement of mass is 4% and in length is 3%, the maximum error in the density is A) 9% B) 13% C) 12% D) 7%
Answer» The density of a cube is measured by measuring its length and mass. If the maximum error in the measurement of mass is 4% and in length is 3%, the maximum error in the density is A) 9% B) 13% C) 12% D) 7%

Discussion

1739.	State three differences between acids and bases.
Answer» State three differences between acids and bases.

Discussion

1740.	Which of the following represents a correct chemical formula? Name it(a) CaCl(b) MgSO4(c) NaSO4(d) NaS
Answer» Which of the following represents a correct chemical formula? Name it $(a)$ $C a C l$ $(b)$ $M g S O_{4}$ $(c)$ $N a S O_{4}$ $(d)$ $N a S$

Discussion

1741.	People say that nothing goes waste in a forest. Can you explain, how?
Answer» People say that nothing goes waste in a forest. Can you explain, how?

Discussion

1742.	Calamine solution is applied on the skin when an ant bites, because the solution is in nature.
Answer» Calamine solution is applied on the skin when an ant bites, because the solution is in nature.

Discussion

1743.	In chemistry lab Ravi took some amount of dilute sulphuric acid and heated it. After that he added copper sulphate powder to it. When he filtered the solution he saw some solid particles on the filter paper. The particles were formed due to which of the following process?
Answer» In chemistry lab Ravi took some amount of dilute sulphuric acid and heated it. After that he added copper sulphate powder to it. When he filtered the solution he saw some solid particles on the filter paper. The particles were formed due to which of the following process?

Discussion

1744.	Where the law of definite proportion is not applicable and why so?
Answer» Where the law of definite proportion is not applicable and why so?

Discussion

1745.	A technique used for separating components of a mixture of solids based on differences in their particle size is known as _______
Answer» A technique used for separating components of a mixture of solids based on differences in their particle size is known as _______

Discussion

1746.	How much volume of HCl (9) is procduced when20 mL of hydrogen gas reacts with 20 mL ofchlorine gas at constant temperature andpressure?
Answer» How much volume of HCl (9) is procduced when20 mL of hydrogen gas reacts with 20 mL ofchlorine gas at constant temperature andpressure?

Discussion

1747.	The following changes are examples of ________ change.
Answer» The following changes are examples of ________ change.

Discussion

1748.

2A+B→ Product [A] [B] Rate (M min−1) 0.1 0.20 6.93×10−3 0.1 0.25 6.93×10−3 0.2 0.3 1.386×10−2 Time in minutes, when concentration of A becomes half

Answer»

2 A + B \to

Product

$[A]$	$[B]$	Rate ( $M {min}^{- 1}$ )
$0.1$	$0.20$	$6.93 \times 10^{- 3}$
$0.1$	$0.25$	$6.93 \times 10^{- 3}$
$0.2$	$0.3$	$1.386 \times 10^{- 2}$

Time in minutes, when concentration of

A

becomes half

Discussion

1749.	What happens to oxygen during welding process
Answer» What happens to oxygen during welding process

Discussion

1750.	Which of the following is reduction?
Answer» Which of the following is reduction?

Discussion

Explore topic-wise InterviewSolutions in .

Which worm among the following is used to decompose the human excreta?

Question 46What is the role of metal or reagents written on arrows inthegiven chemical reactions?

The total number of steps involved in making clothes from fibres is ________.7

19. The rate of reaction between two reactants A and B decrease by a factor of 4 ,if the concentration of reactant B is double. The order of this reaction with respect to reactant B is 1) -1 2) -2 3) 1 4) 2

Select right expression for determining packing fraction (P.F.) of NaCl unit cell (assume ideal), if ions along an body diagonal are absent:

Is the ozone an odd electron molecule ?OR Is the ozone formed or contain an by odd electron bond??

How many electrons are in the third shell of a chlorine atom?

Question 34Under which category of mixtures will you classify alloys and why? (a) A solution is always a liquid. Comment. (b) Can a solution be heterogeneous?

Which are the side effects of acid rain?

How to make a soap

What are indicators? How are they classified?

Why is soil erosion relatively less in dense forests as compared to barren, open fields?

In a first order reaction the concentration of reactant decreases from 800 mol/dm3 to 50 mol/dm3 in 2×104 sec. The rate constant of the reaction in sec−1 is:

Two 1st order reactions having same reactant concentrations proceed at 25oC at the same rate. The temperature coefficient of the rate of the first is 2 and that of second reaction is 3. Find the ratio of the rates of these reactions at 75oC.

What is hydrogen ion?

The deposit of calcium carbonate in the boiler is a bad conductor of heat.These deposits of calcium carbonate is stone like and is called ___ .

A solution undergoes several colour changes over a wide range of pH. What is the solution called?

When the strip of pH paper was put in a given solution, the pH paper changed to orange red. The given solution is most likely to be of :(1) sodium hydroxide(2) hydrochloric acid(3) sodium bicarbonate (4) ethanoic acid

Which of the following is not an example of fibre?

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

How do we get coloured fabrics?

Question 5List any three human activities that you think would lead to air pollution.

What are adhering junction? Explain with diagram.

All elements in the third period have(1) Three complete shells(2) Three complete subshells(3) Three valence electrons(4) Three electrons less than octet and How

Feasibility of quantum number kya hoti hai

Which of these is/are valency/valencies of iron?

what are indicators name all the types of indicators and the detailed definition like natural indicators synthetic indicators olfactory indicators and universal indicators also the formula for the pneumonic of VIBGYOR remembering the nature of acid strong,weak or mild

50. What are the no. of carbon atom per unit cell of diamond?

Is we can say that air is also a matter? If yes, Why? If no, why?

Why does vanadium have the highest heat of atomization?

How rearing of the silkworm is done? How is it different from reeling?

The process of separation of material by passing direct electric current through the solution is known as ____

In the given figure the potential difference V has been plotted against current type of a metallic conductor at the two different temperatures at 25 degree Celsius and Undertaker services respectively the temperature coefficient of resistivity of the year is

What are group Valencies or Common Valencies? How are they calculated?

Impure black coloured solution of acetic acid is added to activated charcoal and is heated for a while. The colour of acetic acid changes to its purest form as the impurities are absorbed by activated charcoal. Which of the following characteristics of coal absorbs the impurity?

What is the shape of the gas in cylindrical can of deodorant?

The density of a cube is measured by measuring its length and mass. If the maximum error in the measurement of mass is 4% and in length is 3%, the maximum error in the density is A) 9% B) 13% C) 12% D) 7%

State three differences between acids and bases.

Which of the following represents a correct chemical formula? Name it(a) CaCl(b) MgSO4(c) NaSO4(d) NaS

People say that nothing goes waste in a forest. Can you explain, how?

Calamine solution is applied on the skin when an ant bites, because the solution is in nature.

In chemistry lab Ravi took some amount of dilute sulphuric acid and heated it. After that he added copper sulphate powder to it. When he filtered the solution he saw some solid particles on the filter paper. The particles were formed due to which of the following process?

Where the law of definite proportion is not applicable and why so?

A technique used for separating components of a mixture of solids based on differences in their particle size is known as _______

How much volume of HCl (9) is procduced when20 mL of hydrogen gas reacts with 20 mL ofchlorine gas at constant temperature andpressure?

The following changes are examples of ________ change.

2A+B→ Product [A] [B] Rate (M min−1) 0.1 0.20 6.93×10−3 0.1 0.25 6.93×10−3 0.2 0.3 1.386×10−2 Time in minutes, when concentration of A becomes half

What happens to oxygen during welding process

Which of the following is reduction?