10223 + Interview Questions in Chemistry Page 18 InterviewSolution

851.	(f) Give balanced equations for the following:(i) Aluminium powder is warmed with hot and concentrated caustic soda solution.(ii) Preparation of methane from anhydrous sodium ethanoate.(iii) Calcination of zinc carbonate.(iv) Plumbo solvency of lead.(v) Heating of sodium nitrate.
Answer» (f) Give balanced equations for the following: (i) Aluminium powder is warmed with hot and concentrated caustic soda solution. (ii) Preparation of methane from anhydrous sodium ethanoate. (iii) Calcination of zinc carbonate. (iv) Plumbo solvency of lead. (v) Heating of sodium nitrate.

Discussion

852.	The +3 ion of which one of the following has half filled 4f subshell?
Answer» The $+ 3$ ion of which one of the following has half filled $4 f$ subshell?

Discussion

853.	An atom with 10 protons is stable because it's __________ is complete.
Answer» An atom with 10 protons is stable because it's __________ is complete.

Discussion

854.	Name the following : [3 MARKS] (a) A lustrous liquid metal. (b) A liquid non-metal (c) A metal which can be cut with a knife (d) A non-metal which is good conductor of electricity. (e) An element which melts when kept on the palm. (f) Good conductor of heat.
Answer» Name the following : [3 MARKS] (a) A lustrous liquid metal. (b) A liquid non-metal (c) A metal which can be cut with a knife (d) A non-metal which is good conductor of electricity. (e) An element which melts when kept on the palm. (f) Good conductor of heat.

Discussion

855.	What are amorphous and crystalline solids??
Answer» What are amorphous and crystalline solids??

Discussion

856.	The substance X normally exists in a physical state which can flow easily but does not fill its vessel completely. It also turns anhydrous copper sulphate blue. When substance X is cooled excessively, it changes into a substance Y which has a fixed shape as well as a fixed volume, If, however, the substance X is heated strongly, it changes into a substance Z which has neither a fixed shape nor a fixed volume. (a) Name the substance. (i) X (ii) Y and (iii) Z. (b) What is the process of conversion of X into Y known as? (c) At which temperature X gets converted into Y? (d) What is the process of conversion of X into Z known as? (e) At which temperature X gets converted into Z?
Answer» The substance X normally exists in a physical state which can flow easily but does not fill its vessel completely. It also turns anhydrous copper sulphate blue. When substance X is cooled excessively, it changes into a substance Y which has a fixed shape as well as a fixed volume, If, however, the substance X is heated strongly, it changes into a substance Z which has neither a fixed shape nor a fixed volume. (a) Name the substance. (i) X (ii) Y and (iii) Z. (b) What is the process of conversion of X into Y known as? (c) At which temperature X gets converted into Y? (d) What is the process of conversion of X into Z known as? (e) At which temperature X gets converted into Z?

856.

The substance X normally exists in a physical state which can flow easily but does not fill its vessel completely. It also turns anhydrous copper sulphate blue. When substance X is cooled excessively, it changes into a substance Y which has a fixed shape as well as a fixed volume, If, however, the substance X is heated strongly, it changes into a substance Z which has neither a fixed shape nor a fixed volume. (a) Name the substance. (i) X (ii) Y and (iii) Z. (b) What is the process of conversion of X into Y known as? (c) At which temperature X gets converted into Y? (d) What is the process of conversion of X into Z known as? (e) At which temperature X gets converted into Z?

Answer»

The substance X normally exists in a physical state which can flow easily but does not fill its vessel completely. It also turns anhydrous copper sulphate blue. When substance X is cooled excessively, it changes into a substance Y which has a fixed shape as well as a fixed volume, If, however, the substance X is heated strongly, it changes into a substance Z which has neither a fixed shape nor a fixed volume.

(a) Name the substance. (i) X (ii) Y and (iii) Z.

(b) What is the process of conversion of X into Y known as?

(c) At which temperature X gets converted into Y?

(d) What is the process of conversion of X into Z known as?

(e) At which temperature X gets converted into Z?

Discussion

857.	Find out the active mass of 7g of N2 in 2L of containe
Answer» Find out the active mass of 7g of N2 in 2L of containe

Discussion

858.	A substance 'A' does not dissociate completely into its ions in the aqueous solutions. It is bitter in taste and soapy to touch. Identify the substance A.
Answer» A substance 'A' does not dissociate completely into its ions in the aqueous solutions. It is bitter in taste and soapy to touch. Identify the substance A.

Discussion

859.	Burning of candle is accompanied by both physical and chemical change. Explain the physical and chemical change involved.
Answer» Burning of candle is accompanied by both physical and chemical change. Explain the physical and chemical change involved.

Discussion

860.	Explain monoatomocity, diatomocity and tri atomocity. [3 MARKS]
Answer» Explain monoatomocity, diatomocity and tri atomocity. [3 MARKS]

Discussion

861.	Two identical point masses are placed at point A(-2,0,0). and point B(2,0,0). The direction of gravitational field at point C(0,-2,0) will be in
Answer» Two identical point masses are placed at point A(-2,0,0). and point B(2,0,0). The direction of gravitational field at point C(0,-2,0) will be in

Discussion

862.	If magnetic quantum number of a given atom representedby -3.then what will be its principal quantum number[BHU 1998, 2005](a) 2ter 4The total number of orbitals in an energy level designated(b) 3
Answer» If magnetic quantum number of a given atom represented by -3.then what will be its principal quantum number [BHU 1998, 2005] (a) 2 ter 4 The total number of orbitals in an energy level designated (b) 3

Discussion

863.	The unit cell cube length for LiCl (just like NaCl structure) is 5.14A.Assuming anion -anion contact,the ionic radius for chloride ion is: a)1.815 A b)2.8A c)3.8A c)4.815A (A - angstrom
Answer» The unit cell cube length for LiCl (just like NaCl structure) is 5.14A.Assuming anion -anion contact,the ionic radius for chloride ion is: a)1.815 A b)2.8A c)3.8A c)4.815A (A - angstrom

Discussion

864.	Why do we need to separate different components of a mixture? Give two examples.
Answer» Why do we need to separate different components of a mixture? Give two examples.

Discussion

865.	Which of the following functional group is present at C_1 carbon of alpha_D_glucose in sucrose options are aldehyde; ketone; hemiacetal; acetal
Answer» Which of the following functional group is present at C_1 carbon of alpha_D_glucose in sucrose options are aldehyde; ketone; hemiacetal; acetal

Discussion

866.	The chemical formula of aluminium sulphate is
Answer» The chemical formula of aluminium sulphate is

Discussion

867.	As we know that applying pressure on gas brings particles of matter closer, how this can change the state of matter? Can gas change into solid by this process?
Answer» As we know that applying pressure on gas brings particles of matter closer, how this can change the state of matter? Can gas change into solid by this process?

Discussion

868.	What is the ph of a universal indicator?
Answer» What is the ph of a universal indicator?

Discussion

869.	(a) What are polyatomic ions? Give two examples.(b) Name the fundamental law that is involved in every equation.
Answer» (a) What are polyatomic ions? Give two examples. (b) Name the fundamental law that is involved in every equation.

869.

(a) What are polyatomic ions? Give two examples.(b) Name the fundamental law that is involved in every equation.

Answer»

(a) What are polyatomic ions? Give two examples.

(b) Name the fundamental law that is involved in every equation.

Discussion

870.	3sinB+ 5cosB = 5. Then 3cosB- 5sinB= ?
Answer» 3sinB+ 5cosB = 5. Then 3cosB- 5sinB= ?

Discussion

871.	Classify each of the following on the basis of their atomicity:(a) F2(b) NO2(c) N2O(d) C2H6(e) P4(f) H2O2(g) P4O10(h) O3(i) HCl(j) CH4(k) He(l) Ag
Answer» Classify each of the following on the basis of their atomicity: (a) $F_{2}$ (b) $N O_{2}$ (c) $N_{2} O$ (d) $C_{2} H_{6}$ (e) $P_{4}$ (f) $H_{2} O_{2}$ (g) $P_{4} O_{10}$ (h) $O_{3}$ (i) $H C l$ (j) $C H_{4}$ (k) $H e$ (l) $A g$

Discussion

872.	Identify X in the following reaction X+ Acid → Salt + Water.
Answer» Identify X in the following reaction X+ Acid → Salt + Water.

Discussion

873.	Which of the following pairs are chemically dissimilar?
Answer» Which of the following pairs are chemically dissimilar?

873.

Which of the following pairs are chemically dissimilar?

Answer»

Which of the following pairs are chemically dissimilar?

Discussion

874.	A gas occupies a volume of 250 ml at 0.98 bar of Hg and 25 C .what additional pressure is required to reduce the gas to 200 ml at the same temperature?
Answer» A gas occupies a volume of 250 ml at 0.98 bar of Hg and 25 C .what additional pressure is required to reduce the gas to 200 ml at the same temperature?

Discussion

875.	The molarity of sulphuric acid solution is 0.2 mol/kg. Calculate the weight of the solution
Answer» The molarity of sulphuric acid solution is 0.2 mol/kg. Calculate the weight of the solution

Discussion

876.	37. Who discovered atoms and how
Answer» 37. Who discovered atoms and how

Discussion

877.	2 moles of helium at 600 K is mixed with 3 moles ofhydrogen at 300 K. The final temperature of themixture would nearly be
Answer» 2 moles of helium at 600 K is mixed with 3 moles ofhydrogen at 300 K. The final temperature of themixture would nearly be

Discussion

878.	The concentration of [H+] and concentration of [OH ] of a 0.1 M aqueous solution of 2% ionised weak acid is [ionicproduct of water = 1/10] (1) 2/10 M and 5/10 M (2) 1/10M and 3/10 M (3) 0.02/10 M and 5/10 M (4) 3/10 M and 4/10 M
Answer» The concentration of [H+] and concentration of [OH ] of a 0.1 M aqueous solution of 2% ionised weak acid is [ionicproduct of water = 1/10] (1) 2/10 M and 5/10 M (2) 1/10M and 3/10 M (3) 0.02/10 M and 5/10 M (4) 3/10 M and 4/10 M

Discussion

879.	X and Y in the below reaction, respectively could be:
Answer» X and Y in the below reaction, respectively could be:

879.

X and Y in the below reaction, respectively could be:

Answer»

X and Y in the below reaction, respectively could be:

Discussion

880.	How many grams of magnesium will have the same number of atoms as 6 grams of carbon?
Answer» How many grams of magnesium will have the same number of atoms as 6 grams of carbon?

Discussion

881.	5 moles of HI is heated in a closed vessel of volume 500ml at 500K. If 60% of HI is dissociated at equilibrium calculate Kc for the reaction.
Answer» 5 moles of HI is heated in a closed vessel of volume 500ml at 500K. If 60% of HI is dissociated at equilibrium calculate Kc for the reaction.

Discussion

882.	What are pions and muons?
Answer» What are pions and muons?

Discussion

883.	Which of the following is a vinylic halide ?
Answer» Which of the following is a vinylic halide ?

Discussion

884.	In an atom which has 2k,8L,8M,2N electrons in the ground state the total number of electrons having m+_1 are a) 20 b) 8 c)12 d)10
Answer» In an atom which has 2k,8L,8M,2N electrons in the ground state the total number of electrons having m+_1 are a) 20 b) 8 c)12 d)10

Discussion

885.	निम्नलिखितप्रश्न का उत्तरदीजिए −कविने कैसी मृत्युको सुमृत्युकहा है?
Answer» निम्नलिखित प्रश्न का उत्तर दीजिए − कवि ने कैसी मृत्यु को सुमृत्यु कहा है?

885.

निम्नलिखितप्रश्न का उत्तरदीजिए −कविने कैसी मृत्युको सुमृत्युकहा है?

Answer»

निम्नलिखित
प्रश्न का उत्तर
दीजिए −

कवि
ने कैसी मृत्यु
को सुमृत्यु
कहा है?

Discussion

886.	The most probable radius (in pm) for finding the electron in He+ is
Answer» The most probable radius (in pm) for finding the electron in $H e^{+}$ is

Discussion

887.	Question 57 An organic compound A on heating with concentrated H2SO4 forms a compound B which on an addition of one mole of hydrogen in presence of Ni forms a compound C. One mole of compound C on combustion forms two moles of CO2 and 3 moles of H2O. Identify the compounds A, B and C and write the chemical equations of the reactions involved.
Answer» Question 57 An organic compound A on heating with concentrated $H_{2} {SO}_{4}$ forms a compound B which on an addition of one mole of hydrogen in presence of $Ni$ forms a compound C. One mole of compound C on combustion forms two moles of ${CO}_{2}$ and 3 moles of $H_{2} O$ . Identify the compounds A, B and C and write the chemical equations of the reactions involved.

Discussion

888.	40. The mass percent of Fe3+ ion present in Fe0.93 O1.00 is
Answer» 40. The mass percent of Fe3+ ion present in Fe0.93 O1.00 is

Discussion

889.	18.If the Avogadro's number is1×10231×1023mol−1−1then the mass of one atom of oxygen would be (a)166.02a.m.u(c)16a.m.u(b)16×10−23a.m.u(d)16×6.02a.m.u
Answer» 18.If the Avogadro's number is1×10231×1023mol−1−1then the mass of one atom of oxygen would be (a)166.02a.m.u(c)16a.m.u(b)16×10−23a.m.u(d)16×6.02a.m.u

Discussion

890.	Burning ofosugar is which change?
Answer» Burning ofosugar is which change?

Discussion

891.	(i) What is molar mass?(ii) Calculate the molar mass of the following substances: C2H2, HCl, HNO3
Answer» (i) What is molar mass? (ii) Calculate the molar mass of the following substances: C₂H₂, HCl, HNO₃

Discussion

892.	50 ml of 2N hcl is diluted by 950 ml water.The ph of resul†an t solution will b
Answer» 50 ml of 2N hcl is diluted by 950 ml water.The ph of resul†an t solution will b

Discussion

893.	_______ is a process of gradual mixing of two substances kept in contact with each other.
Answer» _______ is a process of gradual mixing of two substances kept in contact with each other.

Discussion

894.	All of the following are responsible for water __________.
Answer» All of the following are responsible for water __________.

Discussion

895.	During a physical change, which properties undergo change?
Answer» During a physical change, which properties undergo change?

Discussion

896.	Why does an atom of argon has zero valency ? Explain using the electronic configuration of argon.
Answer» Why does an atom of argon has zero valency ? Explain using the electronic configuration of argon.

Discussion

897.	40.An electron jumps from 5th exited state to ground state then the no of spectral lines in visible region?
Answer» 40.An electron jumps from 5th exited state to ground state then the no of spectral lines in visible region?

Discussion

898.	what is polar covalent bond ?
Answer» what is polar covalent bond ?

Discussion

899.	arrange all group 1 elements in order of highest to lowest reducing agent?
Answer» arrange all group 1 elements in order of highest to lowest reducing agent?

Discussion

900.	Name two metals which react violently with cold water. Write any three observations you would make when such a metal is dropped into water. How would you identify the gas evolved, if any, during the reaction?
Answer» Name two metals which react violently with cold water. Write any three observations you would make when such a metal is dropped into water. How would you identify the gas evolved, if any, during the reaction?

Discussion

Explore topic-wise InterviewSolutions in .

(f) Give balanced equations for the following:(i) Aluminium powder is warmed with hot and concentrated caustic soda solution.(ii) Preparation of methane from anhydrous sodium ethanoate.(iii) Calcination of zinc carbonate.(iv) Plumbo solvency of lead.(v) Heating of sodium nitrate.

The +3 ion of which one of the following has half filled 4f subshell?

An atom with 10 protons is stable because it's __________ is complete.

Name the following : [3 MARKS] (a) A lustrous liquid metal. (b) A liquid non-metal (c) A metal which can be cut with a knife (d) A non-metal which is good conductor of electricity. (e) An element which melts when kept on the palm. (f) Good conductor of heat.

What are amorphous and crystalline solids??

Find out the active mass of 7g of N2 in 2L of containe

A substance 'A' does not dissociate completely into its ions in the aqueous solutions. It is bitter in taste and soapy to touch. Identify the substance A.

Burning of candle is accompanied by both physical and chemical change. Explain the physical and chemical change involved.

Explain monoatomocity, diatomocity and tri atomocity. [3 MARKS]

Two identical point masses are placed at point A(-2,0,0). and point B(2,0,0). The direction of gravitational field at point C(0,-2,0) will be in

If magnetic quantum number of a given atom representedby -3.then what will be its principal quantum number[BHU 1998, 2005](a) 2ter 4The total number of orbitals in an energy level designated(b) 3

The unit cell cube length for LiCl (just like NaCl structure) is 5.14A.Assuming anion -anion contact,the ionic radius for chloride ion is: a)1.815 A b)2.8A c)3.8A c)4.815A (A - angstrom

Why do we need to separate different components of a mixture? Give two examples.

Which of the following functional group is present at C_1 carbon of alpha_D_glucose in sucrose options are aldehyde; ketone; hemiacetal; acetal

The chemical formula of aluminium sulphate is

As we know that applying pressure on gas brings particles of matter closer, how this can change the state of matter? Can gas change into solid by this process?

What is the ph of a universal indicator?

(a) What are polyatomic ions? Give two examples.(b) Name the fundamental law that is involved in every equation.

3sinB+ 5cosB = 5. Then 3cosB- 5sinB= ?

Classify each of the following on the basis of their atomicity:(a) F2(b) NO2(c) N2O(d) C2H6(e) P4(f) H2O2(g) P4O10(h) O3(i) HCl(j) CH4(k) He(l) Ag

Identify X in the following reaction X+ Acid → Salt + Water.

Which of the following pairs are chemically dissimilar?

A gas occupies a volume of 250 ml at 0.98 bar of Hg and 25 C .what additional pressure is required to reduce the gas to 200 ml at the same temperature?

The molarity of sulphuric acid solution is 0.2 mol/kg. Calculate the weight of the solution

37. Who discovered atoms and how

2 moles of helium at 600 K is mixed with 3 moles ofhydrogen at 300 K. The final temperature of themixture would nearly be

The concentration of [H+] and concentration of [OH ] of a 0.1 M aqueous solution of 2% ionised weak acid is [ionicproduct of water = 1/10] (1) 2/10 M and 5/10 M (2) 1/10M and 3/10 M (3) 0.02/10 M and 5/10 M (4) 3/10 M and 4/10 M

X and Y in the below reaction, respectively could be:

How many grams of magnesium will have the same number of atoms as 6 grams of carbon?

5 moles of HI is heated in a closed vessel of volume 500ml at 500K. If 60% of HI is dissociated at equilibrium calculate Kc for the reaction.

What are pions and muons?

Which of the following is a vinylic halide ?

In an atom which has 2k,8L,8M,2N electrons in the ground state the total number of electrons having m+_1 are a) 20 b) 8 c)12 d)10

निम्नलिखितप्रश्न का उत्तरदीजिए −कविने कैसी मृत्युको सुमृत्युकहा है?

The most probable radius (in pm) for finding the electron in He+ is

40. The mass percent of Fe3+ ion present in Fe0.93 O1.00 is

18.If the Avogadro's number is1×10231×1023mol−1−1then the mass of one atom of oxygen would be (a)166.02a.m.u(c)16a.m.u(b)16×10−23a.m.u(d)16×6.02a.m.u

Burning ofosugar is which change?

(i) What is molar mass?(ii) Calculate the molar mass of the following substances: C2H2, HCl, HNO3

50 ml of 2N hcl is diluted by 950 ml water.The ph of resul†an t solution will b

_______ is a process of gradual mixing of two substances kept in contact with each other.

All of the following are responsible for water __________.

During a physical change, which properties undergo change?

Why does an atom of argon has zero valency ? Explain using the electronic configuration of argon.

40.An electron jumps from 5th exited state to ground state then the no of spectral lines in visible region?

what is polar covalent bond ?

arrange all group 1 elements in order of highest to lowest reducing agent?

Name two metals which react violently with cold water. Write any three observations you would make when such a metal is dropped into water. How would you identify the gas evolved, if any, during the reaction?