15280 + Interview Questions in Chemistry Page 200 InterviewSolution

9951.	The metals which are generally found in the free state are generally present _______ the activity series.
Answer» The metals which are generally found in the free state are generally present _______ the activity series.

Discussion

9952.	The structural formula of ethyl ethanoate is
Answer» The structural formula of ethyl ethanoate is

Discussion

9953.	Identify an element - element combination reaction from the following.
Answer» Identify an element - element combination reaction from the following.

Discussion

9954.	2H2+O2→2H2O What can be inferred from the above equation?
Answer» $2 H_{2} + O_{2} \to 2 H_{2} O$ What can be inferred from the above equation?

9954.

2H2+O2→2H2O What can be inferred from the above equation?

Answer»

$2 H_{2} + O_{2} \to 2 H_{2} O$

What can be inferred from the above equation?

Discussion

9955.	A cobalt target is bombarded with electrons and the wavelength of its characteristic spectrum are measured. A second fainter, characteristic spectrum is also found because of an impurity in the target. The wavelength of the Kα lines are 178.9 pm (cobalt) & 143.5 pm (impurity). If atomic number of impurity is 5x, then value of x is___
Answer» A cobalt target is bombarded with electrons and the wavelength of its characteristic spectrum are measured. A second fainter, characteristic spectrum is also found because of an impurity in the target. The wavelength of the $K_{α}$ lines are 178.9 pm (cobalt) & 143.5 pm (impurity). If atomic number of impurity is 5x, then value of x is___

Discussion

9956.	An electron is in an excited state in a hydrogen like atom. It has a total energy of –3.4 eV. Find out the value of kinetic energy of the electron (E) and its de-Broglie wavelength λ.
Answer» An electron is in an excited state in a hydrogen like atom. It has a total energy of –3.4 eV. Find out the value of kinetic energy of the electron (E) and its de-Broglie wavelength $λ$ .

Discussion

9957.	The major product formed in the reaction is
Answer» The major product formed in the reaction is

Discussion

9958.	The number of molecules in 22.4 cubic cm of dinitrogen gas at STP is
Answer» The number of molecules in 22.4 cubic cm of dinitrogen gas at STP is

Discussion

9959.	Importance of plaster of Paris with definition and with marks.
Answer» Importance of plaster of Paris with definition and with marks.

Discussion

9960.	An element ‘X’ has atomic mass number = 27. If the number of electrons = 13. The number of neutrons will be _____.
Answer» An element ‘X’ has atomic mass number = 27. If the number of electrons = 13. The number of neutrons will be _____.

Discussion

9961.	Does copper react with acids?
Answer» Does copper react with acids?

Discussion

9962.	What is the common oxidation state of all the elements of alkali metal, alkali earth metals, noble gases?
Answer» What is the common oxidation state of all the elements of alkali metal, alkali earth metals, noble gases?

Discussion

9963.	An electric current is passed through an aqueous solution of lead(II) chloride. The half-reactions are: Cathode- Pbx+(aq) + xe−→Pb(s) Anode - Cl−y(aq)→Cl(s)+ye− Find the value of x + y.3
Answer» An electric current is passed through an aqueous solution of lead(II) chloride. The half-reactions are: Cathode- ${Pb}^{x +} (aq) + x e^{-} \to Pb(s)$ Anode - ${Cl}^{- y} (aq) \to Cl(s) + y e^{-}$ Find the value of x + y. 3

Discussion

9964.	On passing a current of HCl gas in a saturated solution of NaCl the solubility of NaCl
Answer» On passing a current of $H C l$ gas in a saturated solution of $N a C l$ the solubility of $N a C l$

9964.

On passing a current of HCl gas in a saturated solution of NaCl the solubility of NaCl

Answer»

On passing a current of $H C l$ gas in a saturated solution of $N a C l$ the

solubility of $N a C l$

Discussion

9965.	What are olfactory indicators. dry HCL gas does not change the colour of dry Litmus give reasons.
Answer» What are olfactory indicators. dry HCL gas does not change the colour of dry Litmus give reasons.

Discussion

9966.	The atomic radius in case of inert gases is
Answer» The atomic radius in case of inert gases is

Discussion

9967.	Why does excess of bubbles come out when the cap of a cola drink is opened?
Answer» Why does excess of bubbles come out when the cap of a cola drink is opened?

Discussion

9968.	The reaction : 4N2O+CH4→CO2+2H2I+4N2 takes place in hte gaseous state. If all volumes are measured at the same temperature and pressure, calculate the volume of dinitrogen oxide (N2O) required to give 150cm3 of steam.
Answer» The reaction : $4 N_{2} O + C H_{4} \to C O_{2} + 2 H_{2} I + 4 N_{2}$ takes place in hte gaseous state. If all volumes are measured at the same temperature and pressure, calculate the volume of dinitrogen oxide $(N_{2} O)$ required to give $150 c m^{3}$ of steam.

Discussion

9969.	The number of valence electrons in sulphur are ___ and in S8 each sulphur is bonded to ___ other sulphur atom/atoms.
Answer» The number of valence electrons in sulphur are ___ and in $S_{8}$ each sulphur is bonded to ___ other sulphur atom/atoms.

Discussion

9970.	Consider the give statements and select the correct option. (i) Ammonium hydroxide reacts with lead nitrate to yield a chalky white precipitate (ii) Ammonia is a colourless, basic gas lighter than air
Answer» Consider the give statements and select the correct option. (i) Ammonium hydroxide reacts with lead nitrate to yield a chalky white precipitate (ii) Ammonia is a colourless, basic gas lighter than air

9970.

Consider the give statements and select the correct option. (i) Ammonium hydroxide reacts with lead nitrate to yield a chalky white precipitate (ii) Ammonia is a colourless, basic gas lighter than air

Answer»

Consider the give statements and select the correct option.

(i) Ammonium hydroxide reacts with lead nitrate to yield a chalky white precipitate

(ii) Ammonia is a colourless, basic gas lighter than air

Discussion

9971.	Why do HCl, H2SO4, HNO3, etc., show acidic character in aqueous solutions while solutions of compounds like C6H12O6 (glucose) and C2H5OH (alcohol) do not show acidic character ?
Answer» Why do $H C l, H_{2} S O_{4}, H N O_{3},$ etc., show acidic character in aqueous solutions while solutions of compounds like $C_{6} H_{12} O_{6}$ (glucose) and $C_{2} H_{5} O H$ (alcohol) do not show acidic character ?

Discussion

9972.	The functional group present in ethanol is:
Answer» The functional group present in ethanol is:

Discussion

9973.	A choking pungent odour is obtained when methane reacts with ___ in the presence of sunlight.
Answer» A choking pungent odour is obtained when methane reacts with ___ in the presence of sunlight.

Discussion

9974.	Balance the following chemical equations. [3 MARKS] 1. HNO3+Ca(OH)2→Ca(NO3)2+H2O 2. NaOH+H2SO4→Na2SO4+H2O 3. MnO2+HCl→MnCl2+Cl2+H2O
Answer» Balance the following chemical equations. [3 MARKS] 1. ${HNO}_{3} + {Ca(OH)}_{2} \to {Ca(NO}_{3})_{2} + H_{2} O$ 2. $NaOH + H_{2} {SO}_{4} \to {Na}_{2} {SO}_{4} + H_{2} O$ 3. ${MnO}_{2} + HCl \to {MnCl}_{2} + {Cl}_{2} + H_{2} O$

9974.

Balance the following chemical equations. [3 MARKS] 1. HNO3+Ca(OH)2→Ca(NO3)2+H2O 2. NaOH+H2SO4→Na2SO4+H2O 3. MnO2+HCl→MnCl2+Cl2+H2O

Answer»

Balance the following chemical equations. [3 MARKS]

1. ${HNO}_{3} + {Ca(OH)}_{2} \to {Ca(NO}_{3})_{2} + H_{2} O$
2. $NaOH + H_{2} {SO}_{4} \to {Na}_{2} {SO}_{4} + H_{2} O$
3. ${MnO}_{2} + HCl \to {MnCl}_{2} + {Cl}_{2} + H_{2} O$

Discussion

9975.	CH3COOH(aq)+CH3CH2OH(aq)→CH3COOC2H5(aq)+H2O(aq) This reaction is named as
Answer» $C H_{3} C O O H (a q) + C H_{3} C H_{2} O H (a q) \to C H_{3} C O O C_{2} H_{5} (a q) + H_{2} O (a q)$ This reaction is named as

Discussion

9976.	Question 27 The heteroatoms present in CH3—CH2—O—CH2—CH2Cl are (i) oxygen (ii) carbon (iii) hydrogen (iv) chlorine (a) (i) and (ii) (b) (ii) and (iii) (c) (iii) and (iv) (d) (i) and (iv)
Answer» Question 27 The heteroatoms present in $C H_{3} — C H_{2} — O — C H_{2} — C H_{2} C l$ are (i) oxygen (ii) carbon (iii) hydrogen (iv) chlorine (a) (i) and (ii) (b) (ii) and (iii) (c) (iii) and (iv) (d) (i) and (iv)

Discussion

9977.	(a) Write one reaction in which aluminium oxide behaves as a basic oxide and another in which it behaves as an acidic oxide. (b) What special name is given to substances like aluminium oxide? (c) Name another metal oxide which behaves like aluminium oxide.
Answer» (a) Write one reaction in which aluminium oxide behaves as a basic oxide and another in which it behaves as an acidic oxide. (b) What special name is given to substances like aluminium oxide? (c) Name another metal oxide which behaves like aluminium oxide.

Discussion

9978.	Identify the isomerism from the image given below.
Answer» Identify the isomerism from the image given below.

9978.

Identify the isomerism from the image given below.

Answer»

Identify the isomerism from the image given below.

Discussion

9979.	Which of the following statement is not true for resonance?
Answer» Which of the following statement is not true for resonance?

Discussion

9980.	The ratio in which calcium and chlorine atoms combine to form 1 molecule of CaCl2 is
Answer» The ratio in which calcium and chlorine atoms combine to form 1 molecule of ${CaCl}_{2}$ is

Discussion

9981.	When an object made of metal A is kept in air for a considerable time, it loses its shine and becomes almost black due to the formation of a layer of substance B. When an object made of anoither metal C is kept in damp air for a considerable time, it gets covered with a green layer of substance D. Metal A is the best conductor of electricity whereas metal C is the next best conductor of electricity. (a) What is metal A? (b) What is metal C? (c) Name the substance B. (d) Name the substance D. (e) What type of chemicall can be used to remove the green layer from meatl C and clean it? Why?
Answer» When an object made of metal A is kept in air for a considerable time, it loses its shine and becomes almost black due to the formation of a layer of substance B. When an object made of anoither metal C is kept in damp air for a considerable time, it gets covered with a green layer of substance D. Metal A is the best conductor of electricity whereas metal C is the next best conductor of electricity. (a) What is metal A? (b) What is metal C? (c) Name the substance B. (d) Name the substance D. (e) What type of chemicall can be used to remove the green layer from meatl C and clean it? Why?

Discussion

9982.	Which of the following will contain an Avogadro number of particles?
Answer» Which of the following will contain an Avogadro number of particles?

Discussion

9983.	Duralumin is an alloy of __________.
Answer» Duralumin is an alloy of __________.

Discussion

9984.	The gas used in welding and cutting metals is _______.
Answer» The gas used in welding and cutting metals is _______.

Discussion

9985.	What is the name of the chemical compound in the given figure?
Answer» What is the name of the chemical compound in the given figure?

Discussion

9986.	explain thermite reaction . Give example mention its uses
Answer» explain thermite reaction . Give example mention its uses

Discussion

9987.	Can I get all the chemical properties of nonmetals?
Answer» Can I get all the chemical properties of nonmetals?

Discussion

9988.	Which of the following are biodegradable and which non-biodegradable? Glass bottle, Paper, Ballpoint pen refill, Hay, DDT, Wheat, Cake, Wood, Polythene bag, Jute bag, Cotton cloth, Grass, Vegetable peels
Answer» Which of the following are biodegradable and which non-biodegradable? Glass bottle, Paper, Ballpoint pen refill, Hay, DDT, Wheat, Cake, Wood, Polythene bag, Jute bag, Cotton cloth, Grass, Vegetable peels

Discussion

9989.	When acid and base react, what type of reaction occurs?
Answer» When acid and base react, what type of reaction occurs?

Discussion

9990.	When ethanol reacts with sulphuric acid it undergoes dehydration reaction to give :
Answer» When ethanol reacts with sulphuric acid it undergoes dehydration reaction to give :

Discussion

9991.	What do you observe when : (a) Blue vitriol is heated ? (b) Washing soda is exposed to air ? (c) Blue litmus solution is added to water ?
Answer» What do you observe when : (a) Blue vitriol is heated ? (b) Washing soda is exposed to air ? (c) Blue litmus solution is added to water ?

9991.

What do you observe when : (a) Blue vitriol is heated ? (b) Washing soda is exposed to air ? (c) Blue litmus solution is added to water ?

Answer»

What do you observe when :

(a) Blue vitriol is heated ?

(b) Washing soda is exposed to air ?

(c) Blue litmus solution is added to water ?

Discussion

9992.	Name an ore of zinc other than zinc oxide. Also, name the process by which this ore can be converted into zinc oxide? [2 MARKS]
Answer» Name an ore of zinc other than zinc oxide. Also, name the process by which this ore can be converted into zinc oxide? [2 MARKS]

Discussion

9993.	What are the physical and chemical properties of ethanoic acid?
Answer» What are the physical and chemical properties of ethanoic acid?

Discussion

9994.	Sulphur in sulphuric acid has an oxidation number of :
Answer» Sulphur in sulphuric acid has an oxidation number of :

Discussion

9995.	How many carbon atoms are present in 0.35 mol of C6H12O6 :
Answer» How many carbon atoms are present in 0.35 mol of $C_{6} H_{12} O_{6}$ :

Discussion

9996.	How hydronium ion is formed?
Answer» How hydronium ion is formed?

Discussion

9997.	Which type of solution contains less amount of solute in the solution?
Answer» Which type of solution contains less amount of solute in the solution?

Discussion

9998.	Which of the following can be classified as methods of concentration of ore?
Answer» Which of the following can be classified as methods of concentration of ore?

Discussion

9999.	With the help of an example, explain the process of hydrogenation. Mention the essential conditions for the reaction and state the change in physical property with the formation of the product.
Answer» With the help of an example, explain the process of hydrogenation. Mention the essential conditions for the reaction and state the change in physical property with the formation of the product.

Discussion

10000.	Corrosion of some metals is an advantage. Explain with an example.
Answer» Corrosion of some metals is an advantage. Explain with an example.

Discussion

Explore topic-wise InterviewSolutions in .

The metals which are generally found in the free state are generally present _______ the activity series.

The structural formula of ethyl ethanoate is

Identify an element - element combination reaction from the following.

2H2+O2→2H2O What can be inferred from the above equation?

An electron is in an excited state in a hydrogen like atom. It has a total energy of –3.4 eV. Find out the value of kinetic energy of the electron (E) and its de-Broglie wavelength λ.

The major product formed in the reaction is

The number of molecules in 22.4 cubic cm of dinitrogen gas at STP is

Importance of plaster of Paris with definition and with marks.

An element ‘X’ has atomic mass number = 27. If the number of electrons = 13. The number of neutrons will be _____.

Does copper react with acids?

What is the common oxidation state of all the elements of alkali metal, alkali earth metals, noble gases?

An electric current is passed through an aqueous solution of lead(II) chloride. The half-reactions are: Cathode- Pbx+(aq) + xe−→Pb(s) Anode - Cl−y(aq)→Cl(s)+ye− Find the value of x + y.3

On passing a current of HCl gas in a saturated solution of NaCl the solubility of NaCl

What are olfactory indicators. dry HCL gas does not change the colour of dry Litmus give reasons.

The atomic radius in case of inert gases is

Why does excess of bubbles come out when the cap of a cola drink is opened?

The reaction : 4N2O+CH4→CO2+2H2I+4N2 takes place in hte gaseous state. If all volumes are measured at the same temperature and pressure, calculate the volume of dinitrogen oxide (N2O) required to give 150cm3 of steam.

The number of valence electrons in sulphur are ___ and in S8 each sulphur is bonded to ___ other sulphur atom/atoms.

Consider the give statements and select the correct option. (i) Ammonium hydroxide reacts with lead nitrate to yield a chalky white precipitate (ii) Ammonia is a colourless, basic gas lighter than air

Why do HCl, H2SO4, HNO3, etc., show acidic character in aqueous solutions while solutions of compounds like C6H12O6 (glucose) and C2H5OH (alcohol) do not show acidic character ?

The functional group present in ethanol is:

A choking pungent odour is obtained when methane reacts with ___ in the presence of sunlight.

Balance the following chemical equations. [3 MARKS] 1. HNO3+Ca(OH)2→Ca(NO3)2+H2O 2. NaOH+H2SO4→Na2SO4+H2O 3. MnO2+HCl→MnCl2+Cl2+H2O

CH3COOH(aq)+CH3CH2OH(aq)→CH3COOC2H5(aq)+H2O(aq) This reaction is named as

Question 27 The heteroatoms present in CH3—CH2—O—CH2—CH2Cl are ​​​​​​ (i) oxygen (ii) carbon (iii) hydrogen (iv) chlorine (a) (i) and (ii) (b) (ii) and (iii) (c) (iii) and (iv) (d) (i) and (iv)

(a) Write one reaction in which aluminium oxide behaves as a basic oxide and another in which it behaves as an acidic oxide. (b) What special name is given to substances like aluminium oxide? (c) Name another metal oxide which behaves like aluminium oxide.

Identify the isomerism from the image given below.

Which of the following statement is not true for resonance?

The ratio in which calcium and chlorine atoms combine to form 1 molecule of CaCl2 is

Which of the following will contain an Avogadro number of particles?

Duralumin is an alloy of __________.

The gas used in welding and cutting metals is _______.

What is the name of the chemical compound in the given figure?

explain thermite reaction . Give example mention its uses

Can I get all the chemical properties of nonmetals?

Which of the following are biodegradable and which non-biodegradable? Glass bottle, Paper, Ballpoint pen refill, Hay, DDT, Wheat, Cake, Wood, Polythene bag, Jute bag, Cotton cloth, Grass, Vegetable peels

When acid and base react, what type of reaction occurs?

When ethanol reacts with sulphuric acid it undergoes dehydration reaction to give :

What do you observe when : (a) Blue vitriol is heated ? (b) Washing soda is exposed to air ? (c) Blue litmus solution is added to water ?

Name an ore of zinc other than zinc oxide. Also, name the process by which this ore can be converted into zinc oxide? [2 MARKS]

What are the physical and chemical properties of ethanoic acid?

Sulphur in sulphuric acid has an oxidation number of :

How many carbon atoms are present in 0.35 mol of C6H12O6 :

How hydronium ion is formed?

Which type of solution contains less amount of solute in the solution?

Which of the following can be classified as methods of concentration of ore?

With the help of an example, explain the process of hydrogenation. Mention the essential conditions for the reaction and state the change in physical property with the formation of the product.

Corrosion of some metals is an advantage. Explain with an example.

The number of valence electrons in sulphur are _ and in S8 each sulphur is bonded to _ other sulphur atom/atoms.

Question 27 The heteroatoms present in CH3—CH2—O—CH2—CH2Cl are (i) oxygen (ii) carbon (iii) hydrogen (iv) chlorine (a) (i) and (ii) (b) (ii) and (iii) (c) (iii) and (iv) (d) (i) and (iv)