15280 + Interview Questions in Chemistry Page 26 InterviewSolution

1251.	How come when the electrons collision time decreases the average velocity decrease too?
Answer» How come when the electrons collision time decreases the average velocity decrease too?

Discussion

1252.	The modern periodic table was prepared by : (a) Dobereiner (b) Newlands (c) Bohr (d) Mendeleev
Answer» The modern periodic table was prepared by : (a) Dobereiner (b) Newlands (c) Bohr (d) Mendeleev

1252.

The modern periodic table was prepared by : (a) Dobereiner (b) Newlands (c) Bohr (d) Mendeleev

Answer»

The modern periodic table was prepared by :

(a) Dobereiner (b) Newlands (c) Bohr (d) Mendeleev

Discussion

1253.	45. 5 moles of so2 and 5 moles of o2 react in close vessel. At equilibrium 60% of the so2 is comsumed . The total number of gaseous moles( so2, O2, so3 ) in the vessel is
Answer» 45. 5 moles of so2 and 5 moles of o2 react in close vessel. At equilibrium 60% of the so2 is comsumed . The total number of gaseous moles( so2, O2, so3 ) in the vessel is

Discussion

1254.	Differentiate between oxidation and reduction reaction?
Answer» Differentiate between oxidation and reduction reaction?

Discussion

1255.	Write an aquatic food chain.
Answer» Write an aquatic food chain.

Discussion

1256.	As per IS code of practice, concrete should be cured at :
Answer» As per IS code of practice, concrete should be cured at :

Discussion

1257.	What is the chief product obtained when n-butane is treated with bromine in the presence of light at 130∘C
Answer» What is the chief product obtained when n-butane is treated with bromine in the presence of light at $130^{\circ} C$

Discussion

1258.	Sulphuric acid is not reacted with sodium chloride above a temperature of 200 degrees celcius as the glass apparatus gets damaged due to :
Answer» Sulphuric acid is not reacted with sodium chloride above a temperature of 200 degrees celcius as the glass apparatus gets damaged due to :

Discussion

1259.	Explain the importance of PH in everyday life
Answer» Explain the importance of PH in everyday life

Discussion

1260.	Identify X in the following reaction X + Water → Base.
Answer» Identify X in the following reaction X + Water $\to$ Base.

Discussion

1261.	1.CaCO3(s) ------> CaO(s) +CO2(g) 2.) 2AgBr(s)---------->2Ag(s) + Br2(g) Mention the types of reactions to which the above equations belong. Also mention which of them is a photochemical reaction
Answer» 1.CaCO_{3(s) ------> CaO}_{(s) +}CO2_{(g) 2.) 2AgBr(s)---------->2Ag(s) + B}_{r2(g) Mention the types of reactions to which the above equations belong. Also mention which of them is a photochemical reaction}

Discussion

1262.	Write a note on any five of the common alloys ?
Answer» Write a note on any five of the common alloys ?

Discussion

1263.	how to calculate molecular mass of hydrated oxalic acid from oxalic acid
Answer» how to calculate molecular mass of hydrated oxalic acid from oxalic acid

Discussion

1264.	H2S gas when passed through a solution of cations containing HCl precipitates the cations of second groupof qualitative analysis but not those belonging to the fourth group. It is because (1) Presence of HCl decreases the sulphide ion concentration (2) Presence of HCl increases the sulphide ion concentration (3) Solubility product of group II sulphides is more than that of group IV sulphides (4) Sulphides of group IV cations are unstable in HCl
Answer» H2S gas when passed through a solution of cations containing HCl precipitates the cations of second groupof qualitative analysis but not those belonging to the fourth group. It is because (1) Presence of HCl decreases the sulphide ion concentration (2) Presence of HCl increases the sulphide ion concentration (3) Solubility product of group II sulphides is more than that of group IV sulphides (4) Sulphides of group IV cations are unstable in HCl

Discussion

1265.	Which compound is used as an antacid in medicine : NaHCO3 or Na2CO3 ?
Answer» Which compound is used as an antacid in medicine : $N a H C O_{3} o r N a_{2} C O_{3}$ ?

1265.

Which compound is used as an antacid in medicine : NaHCO3 or Na2CO3 ?

Answer»

Which compound is used as an antacid in medicine :

$N a H C O_{3} o r N a_{2} C O_{3}$ ?

Discussion

1266.	Which of the following statements is correct?
Answer» Which of the following statements is correct?

Discussion

1267.	What is the difference between hydronium ion and hydrogen ion ?
Answer» What is the difference between hydronium ion and hydrogen ion ?

Discussion

1268.	What is meant by biological magnification? With the help of a food chain, explain how biological magnification of harmful chemicals can occur.
Answer» What is meant by biological magnification? With the help of a food chain, explain how biological magnification of harmful chemicals can occur.

Discussion

1269.	A sample of an ideal gas occupies 20 L under a pressure of 0.5 atm. Under isothermal conditions, on increasing its pressure to 1.0 atm, its volume will be:
Answer» A sample of an ideal gas occupies $20 L$ under a pressure of 0.5 atm. Under isothermal conditions, on increasing its pressure to 1.0 atm, its volume will be:

Discussion

1270.	What is the function of teichoic acid and in which bacteria is it found??
Answer» What is the function of teichoic acid and in which bacteria is it found??

Discussion

1271.	The acid used in cold drinks is:-
Answer» The acid used in cold drinks is:-

Discussion

1272.	28.Why is pie bond weaker than Sigma bond!
Answer» 28.Why is pie bond weaker than Sigma bond!

Discussion

1273.	On analysis it was found that black oxide of copper and red oxide of copper contain 80% and 89%of copper respectively. Show that this data is in accordance with law of multiple proportions.
Answer» On analysis it was found that black oxide of copper and red oxide of copper contain 80% and 89%of copper respectively. Show that this data is in accordance with law of multiple proportions.

Discussion

1274.	Why is oxyacetylene flame used for welding purposes?
Answer» Why is oxyacetylene flame used for welding purposes?

Discussion

1275.	You are given three white powders-calcium carbonate, lead carbonate and zinc carbonate. Describe the tests you would carry out in solution, to identify the metal ion in each of the above compounds. Indicate clearly how you would prepare the solutions for the test.
Answer» You are given three white powders-calcium carbonate, lead carbonate and zinc carbonate. Describe the tests you would carry out in solution, to identify the metal ion in each of the above compounds. Indicate clearly how you would prepare the solutions for the test.

Discussion

1276.	A colourless solution of compound X reacts with ammonium hydroxide to form zinc hydroxide and ammonium chloride.What is X?
Answer» A colourless solution of compound X reacts with ammonium hydroxide to form zinc hydroxide and ammonium chloride.What is X?

Discussion

1277.	Choose the correct answer:Brass is an alloy of(a) Copper and tin(b) Copper and zinc(c) Zinc and lead(d) Lead and tin
Answer» Choose the correct answer: Brass is an alloy of (a) Copper and tin (b) Copper and zinc (c) Zinc and lead (d) Lead and tin

Discussion

1278.	Define Ecell and E^°cell . and basic differences between them
Answer» Define Ecell and E^°cell . and basic differences between them

Discussion

1279.	On what basis is priority of functional groups for IUPAC nomenclature set?
Answer» On what basis is priority of functional groups for IUPAC nomenclature set?

Discussion

1280.	The rxn of tin metal with acid can be written as Sn(s) + 2H^+(aq) gives(equilibrium) Sn^2+(aq) +H2(g);E°Sn^2+/Sn=-0.14V assume that [Sn^2+]=1M and the partial pressure of hydrogen gas is 1atm,then the (a)cell rxn is spontaneous at ph=5 (b)cell rxn is non spontaneous at standard conditions (c)cell rxn is spontaneous at ph=2 (d)cell rxn is spontaneous for all ph values
Answer» The rxn of tin metal with acid can be written as Sn(s) + 2H^+(aq) gives(equilibrium) Sn^2+(aq) +H2(g);E°Sn^2+/Sn=-0.14V assume that [Sn^2+]=1M and the partial pressure of hydrogen gas is 1atm,then the (a)cell rxn is spontaneous at ph=5 (b)cell rxn is non spontaneous at standard conditions (c)cell rxn is spontaneous at ph=2 (d)cell rxn is spontaneous for all ph values

Discussion

1281.	What are the difference between ionic bond and covalent bond ?
Answer» What are the difference between ionic bond and covalent bond ?

Discussion

1282.	The carbon content of lignite coal type is________
Answer» The carbon content of lignite coal type is________

Discussion

1283.	Read the given statements carefully. (i) Equal volumes of gases contain equal number of molecules at the same temperature and pressure. (ii) 273 K and 1.015×105 Pa are considered as standard temperature and pressure. (iii) Equal volumes of gases contain unequal number of molecules at the same temperature and pressure. (iv) At STP, one mole of any gas will have a volume of 22.4 L. Which of the following statements are correct?
Answer» Read the given statements carefully. (i) Equal volumes of gases contain equal number of molecules at the same temperature and pressure. (ii) 273 K and $1.015 \times 10^{5}$ Pa are considered as standard temperature and pressure. (iii) Equal volumes of gases contain unequal number of molecules at the same temperature and pressure. (iv) At STP, one mole of any gas will have a volume of 22.4 L. Which of the following statements are correct?

1283.

Read the given statements carefully. (i) Equal volumes of gases contain equal number of molecules at the same temperature and pressure. (ii) 273 K and 1.015×105 Pa are considered as standard temperature and pressure. (iii) Equal volumes of gases contain unequal number of molecules at the same temperature and pressure. (iv) At STP, one mole of any gas will have a volume of 22.4 L. Which of the following statements are correct?

Answer»

Read the given statements carefully.

(i) Equal volumes of gases contain equal number of molecules at the same temperature and pressure.
(ii) 273 K and $1.015 \times 10^{5}$ Pa are considered as standard temperature and pressure.
(iii) Equal volumes of gases contain unequal number of molecules at the same temperature and pressure.
(iv) At STP, one mole of any gas will have a volume of 22.4 L.

Which of the following statements are correct?

Discussion

1284.	(a) How does the tendency to lose electrons change as we go down in group 1 of the periodic table? Why does it change this way? (b) How does the tendency to gain electrons change as we go down in group 17 of the periodic table? Why does it change this way?
Answer» (a) How does the tendency to lose electrons change as we go down in group 1 of the periodic table? Why does it change this way? (b) How does the tendency to gain electrons change as we go down in group 17 of the periodic table? Why does it change this way?

1284.

(a) How does the tendency to lose electrons change as we go down in group 1 of the periodic table? Why does it change this way? (b) How does the tendency to gain electrons change as we go down in group 17 of the periodic table? Why does it change this way?

Answer»

(a) How does the tendency to lose electrons change as we go down in group 1 of the periodic table? Why does it change this way?

(b) How does the tendency to gain electrons change as we go down in group 17 of the periodic table? Why does it change this way?

Discussion

1285.	If a÷ b=b÷ c, the value of 1÷ b-c+1÷ b-a is
Answer» If a÷ b=b÷ c, the value of 1÷ b-c+1÷ b-a is

Discussion

1286.	how to calculate ratios of isotopes for average atomic mass
Answer» how to calculate ratios of isotopes for average atomic mass

Discussion

1287.	Question 10Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved?(i) Displacement reaction(ii) Precipitation reaction(iii) Combination reaction(iv) Double displacement reaction(a) (i) only(b) (ii) only(c) (iv) only(d) (ii) and (iv)
Answer» Question 10 Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved? (i) Displacement reaction (ii) Precipitation reaction (iii) Combination reaction (iv) Double displacement reaction (a) (i) only (b) (ii) only (c) (iv) only (d) (ii) and (iv)

1287.

Question 10Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved?(i) Displacement reaction(ii) Precipitation reaction(iii) Combination reaction(iv) Double displacement reaction(a) (i) only(b) (ii) only(c) (iv) only(d) (ii) and (iv)

Answer»

Question 10

Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved?

(i) Displacement reaction

(ii) Precipitation reaction

(iii) Combination reaction

(iv) Double displacement reaction

(a) (i) only

(b) (ii) only

(c) (iv) only

(d) (ii) and (iv)

Discussion

1288.	Name two indicators which can identify the presence of an acid?
Answer» Name two indicators which can identify the presence of an acid?

Discussion

1289.	What is wrong with the following equation Mg+O=MgO Identify the mistake and balance the equation
Answer» What is wrong with the following equation Mg+O=MgO Identify the mistake and balance the equation

1289.

What is wrong with the following equation Mg+O=MgO Identify the mistake and balance the equation

Answer»

What is wrong with the following equation

Mg+O=MgO

Identify the mistake and balance the equation

Discussion

1290.	30ml of 0.1N BaCl2 is mixed with 40ml of 0.2N Al2(SO4)3 . How many BaSO4 are formed?
Answer» 30ml of 0.1N BaCl2 is mixed with 40ml of 0.2N Al2(SO4)3 . How many BaSO4 are formed?

Discussion

1291.	During spontaneous discharge of an electrochemical cell Gibb'sfree energy will(a) Increase(c) Not changeJ &K CET 20121Tb) Decrease(d) Be infini
Answer» During spontaneous discharge of an electrochemical cell Gibb'sfree energy will(a) Increase(c) Not changeJ &K CET 20121Tb) Decrease(d) Be infini

Discussion

1292.	When a burning magnesium ribbon is introduced in a gas jar containing oxygen, it will burn with :(1) a reddish flame(2) a pale blue flame(3) a golden yellow flame(4) a dazzling white flame
Answer» When a burning magnesium ribbon is introduced in a gas jar containing oxygen, it will burn with : (1) a reddish flame (2) a pale blue flame (3) a golden yellow flame (4) a dazzling white flame

Discussion

1293.	NH4Cl crystallizes in a body-centered cubic lattice with an edge length of unit cell equal to 387 pm. If the radius of the Cl− ion is 181 pm, the radius for NH+4 ion is?
Answer» $N H_{4} C l$ crystallizes in a body-centered cubic lattice with an edge length of unit cell equal to 387 pm. If the radius of the $C l^{-}$ ion is 181 pm, the radius for $N H_{4}^{+}$ ion is?

Discussion

1294.	A mixture of MgCO3 and CaCO3 is heated for a long time, then its weight decreases by 50%. Find out the % composition of the mixture.
Answer» A mixture of MgCO3 and CaCO3 is heated for a long time, then its weight decreases by 50%. Find out the % composition of the mixture.

Discussion

1295.	A metal combines with a non-metal by the transfer of electrons to form a compound Y. (i) State the type of bonds in Y. (ii) What can you say about its melting point and boiling point? (iii) Will it be a good conductor of electricity? (iv) Will it dissolve in an organic solvent or not?
Answer» A metal combines with a non-metal by the transfer of electrons to form a compound Y. (i) State the type of bonds in Y. (ii) What can you say about its melting point and boiling point? (iii) Will it be a good conductor of electricity? (iv) Will it dissolve in an organic solvent or not?

Discussion

1296.	iron oxide has formula Fe0.94O. what fraction of Fe exsist as Fe3+
Answer» iron oxide has formula Fe0.94O. what fraction of Fe exsist as Fe3+

Discussion

1297.	Write the composition of the following:(i) methylated spirit(ii) power alcohol(iii) spurious alcohol
Answer» Write the composition of the following: (i) methylated spirit (ii) power alcohol (iii) spurious alcohol

Discussion

1298.	given that^{} Zn +1/2 O2 =ZnO +84000cal Hg+1/2 O2= HgO +21700cal the heat reaction(delH) Zn+HgO =ZnO+Hg 1.105700cal 2.623200cal 3.-105700cal 4.-623200cal
Answer» given that^{} Zn +1/2 O2 =ZnO +84000cal Hg+1/2 O2= HgO +21700cal the heat reaction(delH) Zn+HgO =ZnO+Hg 1.105700cal 2.623200cal 3.-105700cal 4.-623200cal

Discussion

1299.	Which acids are these salts obtained from?a. nitratesb. carbonatesc. chloridesd. sulphates
Answer» Which acids are these salts obtained from? a. nitrates b. carbonates c. chlorides d. sulphates

Discussion

1300.	Define the terms:(a) vapour density(b) molar volume(c) relative atomic mass(d) Avogadro's number(e) relative molecular mass
Answer» Define the terms: (a) vapour density (b) molar volume (c) relative atomic mass (d) Avogadro's number (e) relative molecular mass

Discussion

Explore topic-wise InterviewSolutions in .

How come when the electrons collision time decreases the average velocity decrease too?

The modern periodic table was prepared by : (a) Dobereiner (b) Newlands (c) Bohr (d) Mendeleev

45. 5 moles of so2 and 5 moles of o2 react in close vessel. At equilibrium 60% of the so2 is comsumed . The total number of gaseous moles( so2, O2, so3 ) in the vessel is

Differentiate between oxidation and reduction reaction?

Write an aquatic food chain.

As per IS code of practice, concrete should be cured at :

What is the chief product obtained when n-butane is treated with bromine in the presence of light at 130∘C

Sulphuric acid is not reacted with sodium chloride above a temperature of 200 degrees celcius as the glass apparatus gets damaged due to :

Explain the importance of PH in everyday life

Identify X in the following reaction X + Water → Base.

1.CaCO3(s) ------&gt; CaO(s) +CO2(g) 2.) 2AgBr(s)----------&gt;2Ag(s) + B​​​​​​​​​​r2(g) Mention the types of reactions to which the above equations belong. Also mention which of them is a photochemical reaction

Write a note on any five of the common alloys ?

how to calculate molecular mass of hydrated oxalic acid from oxalic acid

Which compound is used as an antacid in medicine : NaHCO3 or Na2CO3 ?

Which of the following statements is correct?

What is the difference between hydronium ion and hydrogen ion ?

What is meant by biological magnification? With the help of a food chain, explain how biological magnification of harmful chemicals can occur.

A sample of an ideal gas occupies 20 L under a pressure of 0.5 atm. Under isothermal conditions, on increasing its pressure to 1.0 atm, its volume will be:

What is the function of teichoic acid and in which bacteria is it found??

The acid used in cold drinks is:-

28.Why is pie bond weaker than Sigma bond!

On analysis it was found that black oxide of copper and red oxide of copper contain 80% and 89%of copper respectively. Show that this data is in accordance with law of multiple proportions.

Why is oxyacetylene flame used for welding purposes?

You are given three white powders-calcium carbonate, lead carbonate and zinc carbonate. Describe the tests you would carry out in solution, to identify the metal ion in each of the above compounds. Indicate clearly how you would prepare the solutions for the test.

A colourless solution of compound X reacts with ammonium hydroxide to form zinc hydroxide and ammonium chloride.What is X?

Choose the correct answer:Brass is an alloy of(a) Copper and tin(b) Copper and zinc(c) Zinc and lead(d) Lead and tin

Define Ecell and E^°cell . and basic differences between them

On what basis is priority of functional groups for IUPAC nomenclature set?

What are the difference between ionic bond and covalent bond ?

The carbon content of lignite coal type is________

(a) How does the tendency to lose electrons change as we go down in group 1 of the periodic table? Why does it change this way? (b) How does the tendency to gain electrons change as we go down in group 17 of the periodic table? Why does it change this way?

If a÷ b=b÷ c, the value of 1÷ b-c+1÷ b-a is

how to calculate ratios of isotopes for average atomic mass

Name two indicators which can identify the presence of an acid?

What is wrong with the following equation Mg+O=MgO Identify the mistake and balance the equation

30ml of 0.1N BaCl2 is mixed with 40ml of 0.2N Al2(SO4)3 . How many BaSO4 are formed?

During spontaneous discharge of an electrochemical cell Gibb'sfree energy will(a) Increase(c) Not changeJ &K CET 20121Tb) Decrease(d) Be infini

When a burning magnesium ribbon is introduced in a gas jar containing oxygen, it will burn with :(1) a reddish flame(2) a pale blue flame(3) a golden yellow flame(4) a dazzling white flame

NH4Cl crystallizes in a body-centered cubic lattice with an edge length of unit cell equal to 387 pm. If the radius of the Cl− ion is 181 pm, the radius for NH+4 ion is?

A mixture of MgCO3 and CaCO3 is heated for a long time, then its weight decreases by 50%. Find out the % composition of the mixture.

A metal combines with a non-metal by the transfer of electrons to form a compound Y. (i) State the type of bonds in Y. (ii) What can you say about its melting point and boiling point? (iii) Will it be a good conductor of electricity? (iv) Will it dissolve in an organic solvent or not?

iron oxide has formula Fe0.94O. what fraction of Fe exsist as Fe3+

Write the composition of the following:(i) methylated spirit(ii) power alcohol(iii) spurious alcohol

given that^{} Zn +1/2 O2 =ZnO +84000cal Hg+1/2 O2= HgO +21700cal the heat reaction(delH) Zn+HgO =ZnO+Hg 1.105700cal 2.623200cal 3.-105700cal 4.-623200cal

Which acids are these salts obtained from?a. nitratesb. carbonatesc. chloridesd. sulphates

Define the terms:(a) vapour density(b) molar volume(c) relative atomic mass(d) Avogadro's number(e) relative molecular mass

1.CaCO3(s) ------> CaO(s) +CO2(g) 2.) 2AgBr(s)---------->2Ag(s) + Br2(g) Mention the types of reactions to which the above equations belong. Also mention which of them is a photochemical reaction