15280 + Interview Questions in Chemistry Page 151 InterviewSolution

7501.	Write the balanced equation for the following:(a) Action of concentrated nitric acid on copper.(b) Action of heat on AgNO3.
Answer» Write the balanced equation for the following: (a) Action of concentrated nitric acid on copper. (b) Action of heat on AgNO₃.

Discussion

7502.	The hydrocarbon containing a continuous chain which is isomeric with 2-methyl-3-ethylhexane is?
Answer» The hydrocarbon containing a continuous chain which is isomeric with 2-methyl-3-ethylhexane is?

Discussion

7503.	Ka for hcn is 5\ast10^{-10}.For maintaining a constant ph of 9, the volume of 5M kcn solution required to be added to 10ml of 2M hcn solution is A.2ml B.5ml C.3ml D.4ml
Answer» Ka for hcn is 5\ast10^{-10}.For maintaining a constant ph of 9, the volume of 5M kcn solution required to be added to 10ml of 2M hcn solution is A.2ml B.5ml C.3ml D.4ml

Discussion

7504.	which of the following hydrogen bonds is the strongest ? a F-H\cdot\cdot F b O-H\cdot\cdot O c N-H\cdot\cdot F d O- H\cdot\cdot N
Answer» which of the following hydrogen bonds is the strongest ? a F-H\cdot\cdot F b O-H\cdot\cdot O c N-H\cdot\cdot F d O- H\cdot\cdot N

Discussion

7505.	The element which shows the property of catenation is:
Answer» The element which shows the property of catenation is:

Discussion

7506.	Noble metals like gold and platinum can be dissolved in :
Answer» Noble metals like gold and platinum can be dissolved in :

Discussion

7507.	An aqueous solution of sodium chloride is called:
Answer» An aqueous solution of sodium chloride is called:

Discussion

7508.	Explain and drive joules heating effect
Answer» Explain and drive joules heating effect

Discussion

7509.	KMNO4 is an acid or a base?
Answer» $K M N O_{4}$ is an acid or a base?

Discussion

7510.	(a) Sodium hydroxide solution is added to solution A. A white precipitate is formed which is insoluble in excess sodium hydroxide solution. Name the metal ion present in solution A.(b) When ammonium hydroxide is added to solution B, a pale blue precipitate is formed. This pale blue precipitate dissolves in excess ammonium hydroxide to give an inky blue solution. Name the cation present in solution B. What is the probable colour of solution B?
Answer» (a) Sodium hydroxide solution is added to solution A. A white precipitate is formed which is insoluble in excess sodium hydroxide solution. Name the metal ion present in solution A. (b) When ammonium hydroxide is added to solution B, a pale blue precipitate is formed. This pale blue precipitate dissolves in excess ammonium hydroxide to give an inky blue solution. Name the cation present in solution B. What is the probable colour of solution B?

Discussion

7511.	At 25oC, the specific conductance of a saturated solution of AgCl is 2.68×10−4 S m−1 and that of water with which the solution was made is 0.86×10−4 S m−1. If molar conductance at infinite dilution of AgNO3, HNO3 and HCl are, respectively, 133.0×10−4, 421×10−4 and 426.0×10−4Sm2mol−1.Calculate the solubility of AgCl in grams per dm3 in water at the given temperature.
Answer» At $25^{o} C$ , the specific conductance of a saturated solution of $A g C l$ is $2.68 \times 10^{- 4} S m^{- 1}$ and that of water with which the solution was made is $0.86 \times 10^{- 4} S m^{- 1}$ . If molar conductance at infinite dilution of $A g N O_{3}, H N O_{3}$ and $H C l$ are, respectively, $133.0 \times 10^{- 4}$ , $421 \times 10^{- 4}$ and $426.0 \times 10^{- 4} S m^{2} m o l^{- 1}$ . Calculate the solubility of $A g C l$ in grams per $d m^{3}$ in water at the given temperature.

Discussion

7512.	Complete the following equations and write the names of the products formed. (i) CH3COOH + NaOH (ii) C2H5OH + O2 (iii) CH3COOH + C2H5OH
Answer» Complete the following equations and write the names of the products formed. (i) ${C H}_{3} C O O H$ + NaOH (ii) $C_{2} H_{5} O H$ + $O_{2}$ (iii) ${C H}_{3} C O O H$ + $C_{2} H_{5} O H$

Discussion

7513.	State, what is observed when nitric acid is kept in a reagent bottle for a long time.
Answer» State, what is observed when nitric acid is kept in a reagent bottle for a long time.

Discussion

7514.	Select the option/options that increase the amount of carbon dioxide in the air.
Answer» Select the option/options that increase the amount of carbon dioxide in the air.

Discussion

7515.	Which of the following is not a non-metal?
Answer» Which of the following is not a non-metal?

Discussion

7516.	(i) For each of the compounds : (a) ethane (b) vinegar and (c) marsh gas, draw the relevant structural formula.(ii) What word is used to describe these three compounds taken together?
Answer» (i) For each of the compounds : (a) ethane (b) vinegar and (c) marsh gas, draw the relevant structural formula. (ii) What word is used to describe these three compounds taken together?

Discussion

7517.	The value of pH of a solution is 6. It indicates that the concentration of hydroxyl ion is
Answer» The value of pH of a solution is 6. It indicates that the concentration of hydroxyl ion is

Discussion

7518.	What volume pf 3 molar hno3 is needed to oxidise 8g ferrous to ferric,hno3 gets converted to NO
Answer» What volume pf 3 molar hno3 is needed to oxidise 8g ferrous to ferric,hno3 gets converted to NO

Discussion

7519.	Which of the following is an example of a neutralisation reaction?
Answer» Which of the following is an example of a neutralisation reaction?

Discussion

7520.	25. One mole of anhydrous MgCl2 dissolves in water and liberate 25 cal/mol of heat.Enthalpy of hydration of MgCl2 = -30 cal\|/mol.Heat of dissolution of MgCl2.7H2O (s) (A)+5 cal/mol (B)-5cal/mol (C)55 cal/mol (D)-55 cal/mol
Answer» 25. One mole of anhydrous MgCl2 dissolves in water and liberate 25 cal/mol of heat.Enthalpy of hydration of MgCl2 = -30 cal\|/mol.Heat of dissolution of MgCl2.7H2O (s) (A)+5 cal/mol (B)-5cal/mol (C)55 cal/mol (D)-55 cal/mol

Discussion

7521.	In the following statements, the underlined words are jumbled up. Write them in their correct form.(a) Air contains 78% ginroten and 21% gonexy.(b) Vehicles produce high levels of pollutants like carbon dioxide, nitrogen oxides, nobrac moondexi, and mosek(c) Carbon dioxide, thaneme, nitrous oxide, and water vapor are known as heengrouse sesga. (d) Gangotri glacier in Himalaya has started melting because of lablog ringwam(e) Whenever harmful substances such as wagese, toxic chemicals, silt, etc. get mixed with water, the water becomes potdulle.
Answer» In the following statements, the underlined words are jumbled up. Write them in their correct form. (a) Air contains 78% ginroten and 21% gonexy. (b) Vehicles produce high levels of pollutants like carbon dioxide, nitrogen oxides, nobrac moondexi, and mosek (c) Carbon dioxide, thaneme, nitrous oxide, and water vapor are known as heengrouse sesga. (d) Gangotri glacier in Himalaya has started melting because of lablog ringwam (e) Whenever harmful substances such as wagese, toxic chemicals, silt, etc. get mixed with water, the water becomes potdulle.

7521.

In the following statements, the underlined words are jumbled up. Write them in their correct form.(a) Air contains 78% ginroten and 21% gonexy.(b) Vehicles produce high levels of pollutants like carbon dioxide, nitrogen oxides, nobrac moondexi, and mosek(c) Carbon dioxide, thaneme, nitrous oxide, and water vapor are known as heengrouse sesga. (d) Gangotri glacier in Himalaya has started melting because of lablog ringwam(e) Whenever harmful substances such as wagese, toxic chemicals, silt, etc. get mixed with water, the water becomes potdulle.

Answer»

In the following statements, the underlined words are jumbled up. Write them in their correct form.

(a) Air contains 78% ginroten and 21% gonexy.

(b) Vehicles produce high levels of pollutants like carbon dioxide, nitrogen oxides, nobrac moondexi, and mosek

(c) Carbon dioxide, thaneme, nitrous oxide, and water vapor are known as heengrouse sesga.

(d) Gangotri glacier in Himalaya has started melting because of lablog ringwam

(e) Whenever harmful substances such as wagese, toxic chemicals, silt, etc. get mixed with water, the water becomes potdulle.

Discussion

7522.	in all equivalent resonating structures of co32- , around the carbon atom one can there be Two single bonds and a double bond or Three single bonds and one double bond ( with reason(
Answer» in all equivalent resonating structures of co32- , around the carbon atom one can there be Two single bonds and a double bond or Three single bonds and one double bond ( with reason(

Discussion

7523.	What happens when NaoH and sulphuric acid react with each other exactly at 200degree celsius
Answer» What happens when NaoH and sulphuric acid react with each other exactly at 200degree celsius

Discussion

7524.	If energy required to remove one of the the electrons from He atom is 29.5 eV, then what is the value of energy required to convert a heliumatom into α -particle?(1) 54.4 eV(3) 29.5 ev(2) 83.9 ev(4) 24.9 ev
Answer» If energy required to remove one of the the electrons from He atom is 29.5 eV, then what is the value of energy required to convert a heliumatom into α -particle?(1) 54.4 eV(3) 29.5 ev(2) 83.9 ev(4) 24.9 ev

Discussion

7525.	What is added to steel to make stainless steel?
Answer» What is added to steel to make stainless steel?

Discussion

7526.	(a) The following is an extract from 'Metals in the service of Man, Alexander and Street/ Pelican 1976':'Alumina (aluminium oxide) has a very high melting point of over 2000°C so that it cannot readily be liquefied. However, conversion of alumina to aluminium and oxygen, by electrolysis, can occur when it is dissolved in some other substance'.(i) Which solution is used to react with bauxite as a first step in obtaining pure aluminium oxide?(ii) The aluminium oxide for the electrolysis of aluminium is obtained by heating aluminium hydroxide. Write the equation for this reaction.(iii) Name the element which serve both as the anode and the cathode in the extraction of aluminium.(iv) Write the equation for the reaction that occurs at the cathode during the extraction of aluminium by electrolysis.(v) Give the equation for the reaction which occurs at the anode when aluminium is purified by electrolysis.
Answer» (a) The following is an extract from 'Metals in the service of Man, Alexander and Street/ Pelican 1976': 'Alumina (aluminium oxide) has a very high melting point of over 2000°C so that it cannot readily be liquefied. However, conversion of alumina to aluminium and oxygen, by electrolysis, can occur when it is dissolved in some other substance'. (i) Which solution is used to react with bauxite as a first step in obtaining pure aluminium oxide? (ii) The aluminium oxide for the electrolysis of aluminium is obtained by heating aluminium hydroxide. Write the equation for this reaction. (iii) Name the element which serve both as the anode and the cathode in the extraction of aluminium. (iv) Write the equation for the reaction that occurs at the cathode during the extraction of aluminium by electrolysis. (v) Give the equation for the reaction which occurs at the anode when aluminium is purified by electrolysis.

Discussion

7527.	Write two physical properties each.a. Diamondb. Charcoalc. Fullerene
Answer» Write two physical properties each. a. Diamond b. Charcoal c. Fullerene

Discussion

7528.	(a) Describe the importance of pH in everyday life. Illustrate your answer with examples.(b) A farmer has found that the pH of soil in his fields is 4.2. Name any two chemical materials which he can mix with the soil to adjust its pH. Give reason for your choice.(c) Why are detergents also called 'soap-less soaps'? Give the various advantages of detergents over soaps.(d) A person put some universal indicator paper onto wet soap. The pH is found to be 8. What does this tell you about soap?
Answer» (a) Describe the importance of pH in everyday life. Illustrate your answer with examples. (b) A farmer has found that the pH of soil in his fields is 4.2. Name any two chemical materials which he can mix with the soil to adjust its pH. Give reason for your choice. (c) Why are detergents also called 'soap-less soaps'? Give the various advantages of detergents over soaps. (d) A person put some universal indicator paper onto wet soap. The pH is found to be 8. What does this tell you about soap?

Discussion

7529.	74 How many number of oxygen atoms are present in 4.4 g of CO2.
Answer» 74 How many number of oxygen atoms are present in 4.4 g of CO2.

Discussion

7530.	Why cf3 free radical has sp3 hybridisation but ch3 free radical has sp2 hybridisation
Answer» Why cf3 free radical has sp3 hybridisation but ch3 free radical has sp2 hybridisation

Discussion

7531.	State the terms : (a) Substances whose atoms or molecules are arranged in a definite pattern. (b) Different forms of an element found in the same physical state. (c) The property by which atoms of an element link together to form long chain or ring compounds.
Answer» State the terms : (a) Substances whose atoms or molecules are arranged in a definite pattern. (b) Different forms of an element found in the same physical state. (c) The property by which atoms of an element link together to form long chain or ring compounds.

7531.

State the terms : (a) Substances whose atoms or molecules are arranged in a definite pattern. (b) Different forms of an element found in the same physical state. (c) The property by which atoms of an element link together to form long chain or ring compounds.

Answer»

State the terms :

(a) Substances whose atoms or molecules are arranged in a definite pattern.

(b) Different forms of an element found in the same physical state.

(c) The property by which atoms of an element link together to form long chain or ring compounds.

Discussion

7532.	Which of the following reaction produces a base?
Answer» Which of the following reaction produces a base?

Discussion

7533.	10.Which one has ionic bond and co ordinate bond both NH4Cl orCaC2
Answer» 10.Which one has ionic bond and co ordinate bond both NH4Cl orCaC2

Discussion

7534.	any shape of conductor has electric field as sigma/epsilon knot over its surface why? is every conductor no matter of its shape can be treated as spherical conductor as it also has electric field at its surface sigma/epsilon knot.
Answer» any shape of conductor has electric field as sigma/epsilon knot over its surface why? is every conductor no matter of its shape can be treated as spherical conductor as it also has electric field at its surface sigma/epsilon knot.

Discussion

7535.	On passing gas ‘X’ through lime water a white insoluble precipitate of ‘P’ is formed but on passing excessof gas ‘X’ the white precipitate disappears due to the formation of soluble salt ‘Q’. Identify ‘X’, ‘P’ and‘Q’. Write the chemical equation for the reactions involved.
Answer» On passing gas ‘X’ through lime water a white insoluble precipitate of ‘P’ is formed but on passing excess of gas ‘X’ the white precipitate disappears due to the formation of soluble salt ‘Q’. Identify ‘X’, ‘P’ and ‘Q’. Write the chemical equation for the reactions involved.

Discussion

7536.	What are the important properties of material
Answer» What are the important properties of material

Discussion

7537.	What happens to the sodium hydroxide solution when carbon dioxide gas is passed through it?
Answer» What happens to the sodium hydroxide solution when carbon dioxide gas is passed through it?

Discussion

7538.	If 340 gram of mixture of N2 and H2 in the correct ratio gave a 20% yield of ammonia .the produced mass of ammonia would be
Answer» If 340 gram of mixture of N2 and H2 in the correct ratio gave a 20% yield of ammonia .the produced mass of ammonia would be

Discussion

7539.	6.In mineral kinoite change of silicate anion is?
Answer» 6.In mineral kinoite change of silicate anion is?

Discussion

7540.	Q. Capacity of solvent to neutralise charge on ionic compound is called:-(1) Solvation energy(2) Dielectric constant(3) Dipole moment(4) Solubility
Answer» Q. Capacity of solvent to neutralise charge on ionic compound is called:- (1) Solvation energy (2) Dielectric constant (3) Dipole moment (4) Solubility

Discussion

7541.	What is the difference between Williamson synthesis and Williamson continuous etherification reactions?
Answer» What is the difference between Williamson synthesis and Williamson continuous etherification reactions?

Discussion

7542.	Equivalent mass of H2OEquivalent mass of K2SO4.Also. 24h2o
Answer» Equivalent mass of H2O Equivalent mass of K2SO4.Also. 24h2o

Discussion

7543.	Arrange the following in ascending order of their valencyBoron,Beryllium and Lithium.
Answer» Arrange the following in ascending order of their valency Boron,Beryllium and Lithium.

7543.

Arrange the following in ascending order of their valencyBoron,Beryllium and Lithium.

Answer»

Arrange the following in ascending order of their valency

Boron,Beryllium and Lithium.

Discussion

7544.	A non-metal X is an important constituent of our food. It forms two oxides Y and Z. Y is toxic and causes suffocation and even death while Z is responsible for global warming. Identify X, Y and Z.
Answer» A non-metal X is an important constituent of our food. It forms two oxides Y and Z. Y is toxic and causes suffocation and even death while Z is responsible for global warming. Identify X, Y and Z.

Discussion

7545.	In electrolysis of CuSO4 solution why does sulphatr ion not take part in the reaction
Answer» In electrolysis of CuSO4 solution why does sulphatr ion not take part in the reaction

Discussion

7546.	Which of the following statements is true for the given equation? MnO2 + 4HCl → MnCl2 + 2H2O + Cl2
Answer» Which of the following statements is true for the given equation? MnO₂+ 4HCl → MnCl₂ + 2H₂O + Cl₂

7546.

Which of the following statements is true for the given equation? MnO2 + 4HCl → MnCl2 + 2H2O + Cl2

Answer»

Which of the following statements is true for the given equation?

MnO₂+ 4HCl → MnCl₂ + 2H₂O + Cl₂

Discussion

7547.	Which metal is used for making foils used in packing of food materials?
Answer» Which metal is used for making foils used in packing of food materials?

Discussion

7548.	Dithionic acid, thiosulphuric acid and dithionous acid contain x, y and z number of π bonds respectively. Then x+y2+z2 is
Answer» Dithionic acid, thiosulphuric acid and dithionous acid contain x, y and z number of $π$ bonds respectively. Then x+ $y^{2}$ + $z^{2}$ is

Discussion

7549.	What is the number of elements in the : (a) Ist period, and (b) 3rd period, of the modern periodic table ?
Answer» What is the number of elements in the : (a) Ist period, and (b) 3rd period, of the modern periodic table ?

7549.

What is the number of elements in the : (a) Ist period, and (b) 3rd period, of the modern periodic table ?

Answer»

What is the number of elements in the :

(a) Ist period, and

(b) 3rd period, of the modern periodic table ?

Discussion

7550.	Which of the following are concentration cells?
Answer» Which of the following are concentration cells?

Discussion

Explore topic-wise InterviewSolutions in .

Write the balanced equation for the following:(a) Action of concentrated nitric acid on copper.(b) Action of heat on AgNO3.

The hydrocarbon containing a continuous chain which is isomeric with 2-methyl-3-ethylhexane is?

Ka for hcn is 5\ast10^{-10}.For maintaining a constant ph of 9, the volume of 5M kcn solution required to be added to 10ml of 2M hcn solution is A.2ml B.5ml C.3ml D.4ml

which of the following hydrogen bonds is the strongest ? a F-H\cdot\cdot F b O-H\cdot\cdot O c N-H\cdot\cdot F d O- H\cdot\cdot N

The element which shows the property of catenation is:

Noble metals like gold and platinum can be dissolved in :

An aqueous solution of sodium chloride is called:

Explain and drive joules heating effect

KMNO4 is an acid or a base?

Complete the following equations and write the names of the products formed. (i) CH3COOH + NaOH (ii) C2H5OH + O2 (iii) CH3COOH + C2H5OH

State, what is observed when nitric acid is kept in a reagent bottle for a long time.

Select the option/options that increase the amount of carbon dioxide in the air.

Which of the following is not a non-metal?

(i) For each of the compounds : (a) ethane (b) vinegar and (c) marsh gas, draw the relevant structural formula.(ii) What word is used to describe these three compounds taken together?

The value of pH of a solution is 6. It indicates that the concentration of hydroxyl ion is

What volume pf 3 molar hno3 is needed to oxidise 8g ferrous to ferric,hno3 gets converted to NO

Which of the following is an example of a neutralisation reaction?

25. One mole of anhydrous MgCl2 dissolves in water and liberate 25 cal/mol of heat.Enthalpy of hydration of MgCl2 = -30 cal|/mol.Heat of dissolution of MgCl2.7H2O (s) (A)+5 cal/mol (B)-5cal/mol (C)55 cal/mol (D)-55 cal/mol

in all equivalent resonating structures of co32- , around the carbon atom one can there be Two single bonds and a double bond or Three single bonds and one double bond ( with reason(

What happens when NaoH and sulphuric acid react with each other exactly at 200degree celsius

If energy required to remove one of the the electrons from He atom is 29.5 eV, then what is the value of energy required to convert a heliumatom into α -particle?(1) 54.4 eV(3) 29.5 ev(2) 83.9 ev(4) 24.9 ev

What is added to steel to make stainless steel?

Write two physical properties each.a. Diamondb. Charcoalc. Fullerene

74 How many number of oxygen atoms are present in 4.4 g of CO2.

Why cf3 free radical has sp3 hybridisation but ch3 free radical has sp2 hybridisation

State the terms : (a) Substances whose atoms or molecules are arranged in a definite pattern. (b) Different forms of an element found in the same physical state. (c) The property by which atoms of an element link together to form long chain or ring compounds.

Which of the following reaction produces a base?

10.Which one has ionic bond and co ordinate bond both NH4Cl orCaC2

any shape of conductor has electric field as sigma/epsilon knot over its surface why? is every conductor no matter of its shape can be treated as spherical conductor as it also has electric field at its surface sigma/epsilon knot.

What are the important properties of material

What happens to the sodium hydroxide solution when carbon dioxide gas is passed through it?

If 340 gram of mixture of N2 and H2 in the correct ratio gave a 20% yield of ammonia .the produced mass of ammonia would be

6.In mineral kinoite change of silicate anion is?

Q. Capacity of solvent to neutralise charge on ionic compound is called:-(1) Solvation energy(2) Dielectric constant(3) Dipole moment(4) Solubility

What is the difference between Williamson synthesis and Williamson continuous etherification reactions?

Equivalent mass of H2OEquivalent mass of K2SO4.Also. 24h2o

Arrange the following in ascending order of their valencyBoron,Beryllium and Lithium.

A non-metal X is an important constituent of our food. It forms two oxides Y and Z. Y is toxic and causes suffocation and even death while Z is responsible for global warming. Identify X, Y and Z.

In electrolysis of CuSO4 solution why does sulphatr ion not take part in the reaction

Which of the following statements is true for the given equation? MnO2 + 4HCl → MnCl2 + 2H2O + Cl2

Which metal is used for making foils used in packing of food materials?

Dithionic acid, thiosulphuric acid and dithionous acid contain x, y and z number of π bonds respectively. Then x+y2+z2 is

What is the number of elements in the : (a) Ist period, and (b) 3rd period, of the modern periodic table ?

Which of the following are concentration cells?