15280 + Interview Questions in Chemistry Page 266 InterviewSolution

13251.	Write a combination reaction in which two gases combine.
Answer» Write a combination reaction in which two gases combine.

Discussion

13252.	In our NCERT book, a paragraph is written - Sodium and chloride ions, being oppositely charged, attract each other and are held by strong electrostatic forces of attraction to exist as sodium chloride (NaCl). It should be noted that sodium chloride does not exist as molecules but aggregates of oppositely charged ions. But I am getting confused in the last line, I.e. NaCl does not exist as molecules but aggregates of oppositely charged ions. What is meant by this statement?? Please explain very clearly and conceptually.
Answer» In our NCERT book, a paragraph is written - Sodium and chloride ions, being oppositely charged, attract each other and are held by strong electrostatic forces of attraction to exist as sodium chloride (NaCl). It should be noted that sodium chloride does not exist as molecules but aggregates of oppositely charged ions. But I am getting confused in the last line, I.e. NaCl does not exist as molecules but aggregates of oppositely charged ions. What is meant by this statement?? Please explain very clearly and conceptually.

13252.

In our NCERT book, a paragraph is written - Sodium and chloride ions, being oppositely charged, attract each other and are held by strong electrostatic forces of attraction to exist as sodium chloride (NaCl). It should be noted that sodium chloride does not exist as molecules but aggregates of oppositely charged ions. But I am getting confused in the last line, I.e. NaCl does not exist as molecules but aggregates of oppositely charged ions. What is meant by this statement?? Please explain very clearly and conceptually.

Answer»

In our NCERT book, a paragraph is written - Sodium and chloride ions, being oppositely charged, attract each other and are held by strong electrostatic forces of attraction to exist as sodium chloride (NaCl). It should be noted that sodium chloride does not exist as molecules but aggregates of oppositely charged ions.

But I am getting confused in the last line, I.e. NaCl does not exist as molecules but aggregates of oppositely charged ions.

What is meant by this statement??

Please explain very clearly and conceptually.

Discussion

13253.	how we can know how many isomers will be there of a carbon compound?
Answer» how we can know how many isomers will be there of a carbon compound?

Discussion

13254.	A greenish yellow gas X is liberated when concentrated hydrochloric acid is heated with manganese dioxide?
Answer» A greenish yellow gas X is liberated when concentrated hydrochloric acid is heated with manganese dioxide?

Discussion

13255.	The cleaning action of soap is due to the formation of ___ in water.
Answer» The cleaning action of soap is due to the formation of ___ in water.

Discussion

13256.	Write a short note on catenation. [3 MARKS]
Answer» Write a short note on catenation. [3 MARKS]

Discussion

13257.	Two elements X and Y belong to group 1 and 2 respectively in the same period of periodic table. Compare them with respect to: (i)The number of valence electrons in their atoms (ii)Their valencies (iii)Metallic character (iv)The sizes of their atoms (v)The formulae of their oxides (vi) The formulae of their chlorides
Answer» Two elements X and Y belong to group 1 and 2 respectively in the same period of periodic table. Compare them with respect to: (i)The number of valence electrons in their atoms (ii)Their valencies (iii)Metallic character (iv)The sizes of their atoms (v)The formulae of their oxides (vi) The formulae of their chlorides

13257.

Two elements X and Y belong to group 1 and 2 respectively in the same period of periodic table. Compare them with respect to: (i)The number of valence electrons in their atoms (ii)Their valencies (iii)Metallic character (iv)The sizes of their atoms (v)The formulae of their oxides (vi) The formulae of their chlorides

Answer»

Two elements X and Y belong to group 1 and 2 respectively in the same period of periodic table.

Compare them with respect to:

(i)The number of valence electrons in their atoms

(ii)Their valencies

(iii)Metallic character

(iv)The sizes of their atoms

(v)The formulae of their oxides

(vi) The formulae of their chlorides

Discussion

13258.	Which of the following represents the correct order of increasing first ionization enthalpy for Ca, Ba, S, Se and Ar?
Answer» Which of the following represents the correct order of increasing first ionization enthalpy for $C a$ , $B a$ , $S$ , $S e$ and $A r$ ?

Discussion

13259.	When ethanol reacts with sodium metal, it forms two products. These products are : (a) sodium ethanoate and oxygen (b) sodium ethanoate and hydrogen (c) sodium ethoxide and oxygen (d) sodium ethoxide and hydrogen
Answer» When ethanol reacts with sodium metal, it forms two products. These products are : (a) sodium ethanoate and oxygen (b) sodium ethanoate and hydrogen (c) sodium ethoxide and oxygen (d) sodium ethoxide and hydrogen

Discussion

13260.	The volumes of gases A, B, C and D are in the ratio 1:2:2:4 under the same conditions of temperature and pressure. (i) Which sample of gas contains the maximum number of molecules? (ii) If the temperature and the pressure of gas A are kept constant, then what will happen to the volume of A when the number of molecules is doubled? (iii) If this ratio of gas volume refers to the reactants and products for a reaction, which gas law is being observed? (iv) If the volume of A is actually 5.6 dm^3 at STP, of D at STP (Avogadro's Number is 6×1023. (v) Using your answer from (iv), state the mass of D if the gas is dinitrogen oxide(N2O).
Answer» The volumes of gases A, B, C and D are in the ratio 1:2:2:4 under the same conditions of temperature and pressure. (i) Which sample of gas contains the maximum number of molecules? (ii) If the temperature and the pressure of gas A are kept constant, then what will happen to the volume of A when the number of molecules is doubled? (iii) If this ratio of gas volume refers to the reactants and products for a reaction, which gas law is being observed? (iv) If the volume of A is actually 5.6 dm^3 at STP, of D at STP (Avogadro's Number is $6 \times 10^{23}$ . (v) Using your answer from (iv), state the mass of D if the gas is dinitrogen oxide $(N_{2} O)$ .

Discussion

13261.	20 L of H2 gas at S.T.P weigh about:
Answer» 20 L of H₂ gas at S.T.P weigh about:

Discussion

13262.	___ is used in making vinegar.
Answer» ___ is used in making vinegar.

Discussion

13263.	Which one of the following is not a gaseous biogeochemical cycle in ecosystem?
Answer» Which one of the following is not a gaseous biogeochemical cycle in ecosystem?

Discussion

13264.	Which of the following substances is non-biodegradable?
Answer» Which of the following substances is non-biodegradable?

Discussion

13265.	Trophic level of an organism is its ________.
Answer» Trophic level of an organism is its ________.

Discussion

13266.	Discuss the various types of isomerism and also give two examples of each. [5 MARKS]
Answer» Discuss the various types of isomerism and also give two examples of each. [5 MARKS]

Discussion

13267.	Nitric acid dissociates in water to produceions.
Answer» Nitric acid dissociates in water to produceions.

Discussion

13268.	The reaction in which heat is given out along with products is known as ______ reaction.
Answer» The reaction in which heat is given out along with products is known as ______ reaction.

Discussion

13269.	On what basis is a chemical equation balanced?
Answer» On what basis is a chemical equation balanced?

Discussion

13270.	What do you mean by Dobereiner's triad?
Answer» What do you mean by Dobereiner's triad?

Discussion

13271.	A non-metal X reacts with conc. nitric acid to form carbon dioxide, water and nitrogen dioxide. What is X?
Answer» A non-metal X reacts with conc. nitric acid to form carbon dioxide, water and nitrogen dioxide. What is X?

Discussion

13272.	Write the number of periods the modern periodic table has. How do the valency and metallic character of elements vary on moving from left to right in a period? How do the valency and atomic size of elements vary down a group?
Answer» Write the number of periods the modern periodic table has. How do the valency and metallic character of elements vary on moving from left to right in a period? How do the valency and atomic size of elements vary down a group?

Discussion

13273.	What happens when aluminium is heated at 8000C? Statement 1: Aluminium reacts with air to form chlorides. Statement 2: On heating aluminium at 8000C, it burns to form its oxides and nitrides.
Answer» What happens when aluminium is heated at $800^{0} C$ ? Statement 1: Aluminium reacts with air to form chlorides. Statement 2: On heating aluminium at $800^{0} C$ , it burns to form its oxides and nitrides.

13273.

What happens when aluminium is heated at 8000C? Statement 1: Aluminium reacts with air to form chlorides. Statement 2: On heating aluminium at 8000C, it burns to form its oxides and nitrides.

Answer»

What happens when aluminium is heated at $800^{0} C$ ?

Statement 1: Aluminium reacts with air to form chlorides.

Statement 2: On heating aluminium at $800^{0} C$ , it burns to form its oxides and nitrides.

Discussion

13274.	The correct set of four quantum number for the valence electrons for rubidium atom (z = 37) is
Answer» The correct set of four quantum number for the valence electrons for rubidium atom (z = 37) is

Discussion

13275.	A 70% solution (solution 1) of H2SO4 is mixed with a 40% solution (solution 2) of the acid to obtain a 60% solution (solution 3). If solution 1 and solution 2 are mixed in a ratio (by mass) of x:1, the value of x is
Answer» A 70% solution (solution 1) of $H_{2} S O_{4}$ is mixed with a 40% solution (solution 2) of the acid to obtain a 60% solution (solution 3). If solution 1 and solution 2 are mixed in a ratio (by mass) of $x : 1$ , the value of $x$ is

Discussion

13276.	Anhydrous ferric chloride is prepared by:
Answer» Anhydrous ferric chloride is prepared by:

Discussion

13277.	The functional group present in the given compound below is
Answer» The functional group present in the given compound below is

13277.

The functional group present in the given compound below is

Answer»

The functional group present in the given compound below is

Discussion

13278.	The number of molecules present in 200 g of Na2CO3 is
Answer» The number of molecules present in 200 g of ${Na}_{2} {CO}_{3}$ is

Discussion

13279.	Give IUPAC names of the following compounds : (a) C4H9OH (b) C5H11OH
Answer» Give IUPAC names of the following compounds : (a) $C_{4} H_{9} O H$ (b) $C_{5} H_{11} O H$

Discussion

13280.	(a) Describe an activity to show that while the paper is biodegradable but plastic (say, polythene) is non-biodegradable. (b) Explain why some materials are biodegradable but some are non-biodegradable.
Answer» (a) Describe an activity to show that while the paper is biodegradable but plastic (say, polythene) is non-biodegradable. (b) Explain why some materials are biodegradable but some are non-biodegradable.

13280.

(a) Describe an activity to show that while the paper is biodegradable but plastic (say, polythene) is non-biodegradable. (b) Explain why some materials are biodegradable but some are non-biodegradable.

Answer»

(a) Describe an activity to show that while the paper is biodegradable but plastic (say, polythene) is non-biodegradable.

(b) Explain why some materials are biodegradable but some are non-biodegradable.

Discussion

13281.	(a) Describe how washing soda is produced starting from sodium chloride (common salt). Write equations of all the reactions involved. (b) State whether an aqueous solution of washing soda is acidic or alkaline ? Give reason for your answer. (c) What is meant by saying that washing soda has detergent properties ? (d) Give two important uses of washing soda (or sodium carbonate).
Answer» (a) Describe how washing soda is produced starting from sodium chloride (common salt). Write equations of all the reactions involved. (b) State whether an aqueous solution of washing soda is acidic or alkaline ? Give reason for your answer. (c) What is meant by saying that washing soda has detergent properties ? (d) Give two important uses of washing soda (or sodium carbonate).

13281.

(a) Describe how washing soda is produced starting from sodium chloride (common salt). Write equations of all the reactions involved. (b) State whether an aqueous solution of washing soda is acidic or alkaline ? Give reason for your answer. (c) What is meant by saying that washing soda has detergent properties ? (d) Give two important uses of washing soda (or sodium carbonate).

Answer»

(a) Describe how washing soda is produced starting from sodium chloride (common salt). Write equations of all the reactions involved.

(b) State whether an aqueous solution of washing soda is acidic or alkaline ? Give reason for your answer.

(c) What is meant by saying that washing soda has detergent properties ?

(d) Give two important uses of washing soda (or sodium carbonate).

Discussion

13282.	Which of hte following contains maximum number of molecules: (a) 4 g of O2 (b) 4 g of NH3 (c) 4 g of CO2 (d) 4 g of SO2
Answer» Which of hte following contains maximum number of molecules: (a) 4 g of $O_{2}$ (b) 4 g of $N H_{3}$ (c) 4 g of $C O_{2}$ (d) 4 g of $S O_{2}$

Discussion

13283.	The given set up in the figure is for the preparation of an acid. (a) Name the acid prepared by this method. (b) Name the reactants used. (c) Why is an empty flask used? (d) What is the drying agent used? Why is this drying agent chosen? (e) What is the role of the inverted funnel in the arrangement?
Answer» The given set up in the figure is for the preparation of an acid. (a) Name the acid prepared by this method. (b) Name the reactants used. (c) Why is an empty flask used? (d) What is the drying agent used? Why is this drying agent chosen? (e) What is the role of the inverted funnel in the arrangement?

13283.

The given set up in the figure is for the preparation of an acid. (a) Name the acid prepared by this method. (b) Name the reactants used. (c) Why is an empty flask used? (d) What is the drying agent used? Why is this drying agent chosen? (e) What is the role of the inverted funnel in the arrangement?

Answer»

The given set up in the figure is for the preparation of an acid.
(a) Name the acid prepared by this method.
(b) Name the reactants used.
(c) Why is an empty flask used?
(d) What is the drying agent used? Why is this drying agent chosen?
(e) What is the role of the inverted funnel in the arrangement?

Discussion

13284.	Wines primarily consist of ___ (ethanol/methanol)
Answer» Wines primarily consist of ___ (ethanol/methanol)

Discussion

13285.	The chemical formula of the compounds whose primary suffix is “-yne” is-
Answer» The chemical formula of the compounds whose primary suffix is “-yne” is-

Discussion

13286.	Which of the following compounds will not exhibit positional isomerism?
Answer» Which of the following compounds will not exhibit positional isomerism?

Discussion

13287.	120cm3 of a gas is taken at 27.3 K. The temperature is then raised to 0∘. What is the new volume of the gas at Isobaric condition?
Answer» $120 c m^{3}$ of a gas is taken at 27.3 K. The temperature is then raised to $0^{\circ}$ . What is the new volume of the gas at Isobaric condition?

Discussion

13288.	An element X combines with hydrogen to form a compound XH3. The element X is placed on the right side of the periodic table. What is true about the element X?A. Has 3 valence electronsB. Is a metal and is solid.C. Is a non-metal and is a gas.D. Has 5 valence electrons.E. XH3 reacts with water to form a basic compound.
Answer» An element X combines with hydrogen to form a compound $X H_{3}$ . The element X is placed on the right side of the periodic table. What is true about the element X? A. Has 3 valence electrons B. Is a metal and is solid. C. Is a non-metal and is a gas. D. Has 5 valence electrons. E. $X H_{3}$ reacts with water to form a basic compound.

13288.

An element X combines with hydrogen to form a compound XH3. The element X is placed on the right side of the periodic table. What is true about the element X?A. Has 3 valence electronsB. Is a metal and is solid.C. Is a non-metal and is a gas.D. Has 5 valence electrons.E. XH3 reacts with water to form a basic compound.

Answer»

An element X combines with hydrogen to form a compound $X H_{3}$ . The element X is placed on the right side of the periodic table. What is true about the element X?
A. Has 3 valence electrons

B. Is a metal and is solid.

C. Is a non-metal and is a gas.

D. Has 5 valence electrons.

E. $X H_{3}$ reacts with water to form a basic compound.

Discussion

13289.	Give reasons for the following: (a) Sulphuric acid forms two types of salts with NaOH. (b) Red-brown vapours are produced when concentrated sulphuric acid is poured on it (c) A piece of wood becomes black when concentrated sulphuric acid is poured on it. (d) Brisk effervescence is seen when oil of vitriol is added to sodium carbonate. [4 MARKS]
Answer» Give reasons for the following: (a) Sulphuric acid forms two types of salts with NaOH. (b) Red-brown vapours are produced when concentrated sulphuric acid is poured on it (c) A piece of wood becomes black when concentrated sulphuric acid is poured on it. (d) Brisk effervescence is seen when oil of vitriol is added to sodium carbonate. [4 MARKS]

Discussion

13290.	What do you mean by metallic oxides are basic and non metallic oxides are acidic?
Answer» What do you mean by metallic oxides are basic and non metallic oxides are acidic?

Discussion

13291.	Balance: Aluminium carbonate reacts with hydrochloride acid to evolve carbon dioxide gas.
Answer» Balance: Aluminium carbonate reacts with hydrochloride acid to evolve carbon dioxide gas.

Discussion

13292.	Why is flourine highly electronegative? Why is Fr least electronegative?
Answer» Why is flourine highly electronegative? Why is Fr least electronegative?

Discussion

13293.	Question 8 The composition of aqua-regia is (a) Dil.HCl: Conc.HNO3 - 3 : 1 (b) Conc.HCl : Dil.HNO3 - 3 : 1 (c) Conc.HCl : Conc.HNO3 - 3 : 1 (d) Dil.HCl : Dil.HNO3 - 3 : 1
Answer» Question 8 The composition of aqua-regia is (a) ${Dil.HCl: Conc.HNO}_{3}$ - 3 : 1 (b) ${Conc.HCl : Dil.HNO}_{3}$ - 3 : 1 (c) ${Conc.HCl : Conc.HNO}_{3}$ - 3 : 1 (d) ${Dil.HCl : Dil.HNO}_{3}$ - 3 : 1

Discussion

13294.	In electroplating the metal that has to be coated is taken as cathode why?
Answer» In electroplating the metal that has to be coated is taken as cathode why?

Discussion

13295.	What's the relation between K and degree C?
Answer» What's the relation between K and degree C?

Discussion

13296.	When lead react with NaOH, a colourless salt X is formed along with hydrogen. Name the salt X.
Answer» When lead react with NaOH, a colourless salt X is formed along with hydrogen. Name the salt X.

Discussion

13297.	What is the atomicity of Ba
Answer» What is the atomicity of Ba

Discussion

13298.	Name a substance other than sulphur that would react with dry air on heating to form sulphur dioxide.
Answer» Name a substance other than sulphur that would react with dry air on heating to form sulphur dioxide.

Discussion

13299.	Is copper oxide and copper carbonate the same?
Answer» Is copper oxide and copper carbonate the same?

Discussion

13300.	(a) What is meant by catenation? Name two elements which exhibit the property of catenation. (b) Write the names and structural formulae of all the possible isomers of hexane.
Answer» (a) What is meant by catenation? Name two elements which exhibit the property of catenation. (b) Write the names and structural formulae of all the possible isomers of hexane.

Discussion

Explore topic-wise InterviewSolutions in .

Write a combination reaction in which two gases combine.

how we can know how many isomers will be there of a carbon compound?

A greenish yellow gas X is liberated when concentrated hydrochloric acid is heated with manganese dioxide?

The cleaning action of soap is due to the formation of ___ in water.

Write a short note on catenation. [3 MARKS]

Which of the following represents the correct order of increasing first ionization enthalpy for Ca, Ba, S, Se and Ar?

When ethanol reacts with sodium metal, it forms two products. These products are : (a) sodium ethanoate and oxygen (b) sodium ethanoate and hydrogen (c) sodium ethoxide and oxygen (d) sodium ethoxide and hydrogen

20 L of H2 gas at S.T.P weigh about:

___ is used in making vinegar.

Which one of the following is not a gaseous biogeochemical cycle in ecosystem?

Which of the following substances is non-biodegradable?

Trophic level of an organism is its ________.

Discuss the various types of isomerism and also give two examples of each. [5 MARKS]

Nitric acid dissociates in water to produceions.

The reaction in which heat is given out along with products is known as ______ reaction.

On what basis is a chemical equation balanced?

What do you mean by Dobereiner's triad?

A non-metal X reacts with conc. nitric acid to form carbon dioxide, water and nitrogen dioxide. What is X?

Write the number of periods the modern periodic table has. How do the valency and metallic character of elements vary on moving from left to right in a period? How do the valency and atomic size of elements vary down a group?

What happens when aluminium is heated at 8000C? Statement 1: Aluminium reacts with air to form chlorides. Statement 2: On heating aluminium at 8000C, it burns to form its oxides and nitrides.

The correct set of four quantum number for the valence electrons for rubidium atom (z = 37) is

A 70% solution (solution 1) of H2SO4 is mixed with a 40% solution (solution 2) of the acid to obtain a 60% solution (solution 3). If solution 1 and solution 2 are mixed in a ratio (by mass) of x:1, the value of x is

Anhydrous ferric chloride is prepared by:

The functional group present in the given compound below is

The number of molecules present in 200 g of Na2CO3 is

Give IUPAC names of the following compounds : (a) C4H9OH (b) C5H11OH

(a) Describe an activity to show that while the paper is biodegradable but plastic (say, polythene) is non-biodegradable. (b) Explain why some materials are biodegradable but some are non-biodegradable.

Which of hte following contains maximum number of molecules: (a) 4 g of O2 (b) 4 g of NH3 (c) 4 g of CO2 (d) 4 g of SO2

Wines primarily consist of ___ (ethanol/methanol)

The chemical formula of the compounds whose primary suffix is “-yne” is-

Which of the following compounds will not exhibit positional isomerism?

120cm3 of a gas is taken at 27.3 K. The temperature is then raised to 0∘. What is the new volume of the gas at Isobaric condition?

What do you mean by metallic oxides are basic and non metallic oxides are acidic?

Balance: Aluminium carbonate reacts with hydrochloride acid to evolve carbon dioxide gas.

Why is flourine highly electronegative? Why is Fr least electronegative?

Question 8 The composition of aqua-regia is (a) Dil.HCl: Conc.HNO3 - 3 : 1 (b) Conc.HCl : Dil.HNO3 - 3 : 1 (c) Conc.HCl : Conc.HNO3 - 3 : 1 (d) Dil.HCl : Dil.HNO3 - 3 : 1

In electroplating the metal that has to be coated is taken as cathode why?

What's the relation between K and degree C?

When lead react with NaOH, a colourless salt X is formed along with hydrogen. Name the salt X.

What is the atomicity of Ba

Name a substance other than sulphur that would react with dry air on heating to form sulphur dioxide.

Is copper oxide and copper carbonate the same?

(a) What is meant by catenation? Name two elements which exhibit the property of catenation. (b) Write the names and structural formulae of all the possible isomers of hexane.