7248 + Interview Questions in Chemistry Page 38 InterviewSolution

1851.	An object is taken to a height 2R above the surface of earth the increase in potential energy is
Answer» An object is taken to a height 2R above the surface of earth the increase in potential energy is

Discussion

1852.	Prove me how metal carbonated / hydrogencarbonates + Acid ----> Salt + Water + CO2.
Answer» Prove me how metal carbonated / hydrogencarbonates + Acid ----> Salt + Water + CO2.

Discussion

1853.	What are reduction reactions? Give examples.
Answer» What are reduction reactions? Give examples.

Discussion

1854.	consider an atom of li+2 which is a unielecton system and hence bohr's model is applicable to it . ehat is the binding energy of an electron in the first orbit of li+2
Answer» consider an atom of li+2 which is a unielecton system and hence bohr's model is applicable to it . ehat is the binding energy of an electron in the first orbit of li+2

Discussion

1855.	write five points of difference between combustible and non combustible substsnc
Answer» write five points of difference between combustible and non combustible substsnc

Discussion

1856.	Question 1 (f)Which separation techniques will you apply for the separation of the following? f. Oil from water.
Answer» Question 1 (f) Which separation techniques will you apply for the separation of the following? f. Oil from water.

Discussion

1857.	19.In a regular triangular bipyramidal mx5 the number of x_m_x bonds at 180 degree is
Answer» 19.In a regular triangular bipyramidal mx5 the number of x_m_x bonds at 180 degree is

Discussion

1858.	If a compound AB dissociates to the extent of 75% in an aqueous solution, the molality of the solution which shows a 1.82 K rise in the boiling point of the solution is(Given: Molal elevation constant for water =0.52K kg mol−1)
Answer» If a compound $A B$ dissociates to the extent of $75 %$ in an aqueous solution, the molality of the solution which shows a $1.82 K$ rise in the boiling point of the solution is (Given: Molal elevation constant for water $= 0.52 {K kg mol}^{- 1}$ )

Discussion

1859.	Fill in the blanks:(a) Burningof wood and coal causes _______ __of air.(b) Aliquid fuel used in homes is ___________.(c) Fuel must be heated to its ___________before it starts burning.(d) Fireproduced by oil cannot be controlled by _________.
Answer» Fill in the blanks: (a) Burning of wood and coal causes _______ __ of air. (b) A liquid fuel used in homes is ___________. (c) Fuel must be heated to its ___________ before it starts burning. (d) Fire produced by oil cannot be controlled by ________ _.

1859.

Fill in the blanks:(a) Burningof wood and coal causes _ of air.(b) Aliquid fuel used in homes is _.(c) Fuel must be heated to its _before it starts burning.(d) Fireproduced by oil cannot be controlled by _____.

Answer»

Fill in the blanks:

(a) Burning
of wood and coal causes _______ __
of air.

(b) A
liquid fuel used in homes is ___________.

(c) Fuel must be heated to its ___________
before it starts burning.

(d) Fire
produced by oil cannot be controlled by ________
_.

Discussion

1860.	I visited a grocery store to buy some food items, the moment I reached at the bill counter, the person processing the bill for me asked whether I needed a plastic bag and if I did then I would have to pay extra, when I asked him a reason for doing this, what might be the possible reason he gave me?
Answer» I visited a grocery store to buy some food items, the moment I reached at the bill counter, the person processing the bill for me asked whether I needed a plastic bag and if I did then I would have to pay extra, when I asked him a reason for doing this, what might be the possible reason he gave me?

Discussion

1861.	Can Combustion of methane be expressed in the form of oxidation number? How?
Answer» Can Combustion of methane be expressed in the form of oxidation number? How?

Discussion

1862.	A large tank is filled with water upto height H. a small hole is made at the base of the tank.it takes T1 time to decrease height of water to H/x (x>1) and it takes T2 time to take out rest of the water .if T1=T2 then value of x is
Answer» A large tank is filled with water upto height H. a small hole is made at the base of the tank.it takes T1 time to decrease height of water to H/x (x>1) and it takes T2 time to take out rest of the water .if T1=T2 then value of x is

Discussion

1863.	When a metal is reacted with water. Among the following which gas will be liberated?
Answer» When a metal is reacted with water. Among the following which gas will be liberated?

Discussion

1864.	What is the valency of oxygen?
Answer» What is the valency of oxygen?

Discussion

1865.	Why are young children advised to wear coloured clothes at night?
Answer» Why are young children advised to wear coloured clothes at night?

Discussion

1866.	electronic confrigution of carbon
Answer» electronic confrigution of carbon

Discussion

1867.	35. How to form lewis structure for compound like no2.
Answer» 35. How to form lewis structure for compound like no2.

Discussion

1868.	___ is the fixed path the electron takes while revolving around the nucleus
Answer» ___ is the fixed path the electron takes while revolving around the nucleus

Discussion

1869.	A water sample has ppm level concentration of the following metals: Fe=0.2;Mn=5.0;Cu=3.0;Zn=5.0. The metal that makes the water sample unsuitable for drinking is:
Answer» A water sample has ppm level concentration of the following metals: $F e = 0.2; M n = 5.0; C u = 3.0; Z n = 5.0$ . The metal that makes the water sample unsuitable for drinking is:

Discussion

1870.	Increase in the average temperature of Earth's climate is called ______________.
Answer» Increase in the average temperature of Earth's climate is called ______________.

Discussion

1871.	Which among the following is the most reactive metal ? (a) copper (b) calcium (c) iron (d) magnesium
Answer» Which among the following is the most reactive metal ? (a) copper (b) calcium (c) iron (d) magnesium

1871.

Which among the following is the most reactive metal ? (a) copper (b) calcium (c) iron (d) magnesium

Answer»

Which among the following is the most reactive metal ?

(a) copper

(b) calcium

(c) iron

(d) magnesium

Discussion

1872.	What is the rule for naming tricyclic compounds?
Answer» What is the rule for naming tricyclic compounds?

Discussion

1873.	A chemical equation is written in the form of symbols and formulas.Justify this statement
Answer» A chemical equation is written in the form of symbols and formulas.Justify this statement

Discussion

1874.	A hydrogen atom emits a photon in going from n=3 to n=1 state. the recoil speed of the hydrogen atom is nearly
Answer» A hydrogen atom emits a photon in going from n=3 to n=1 state. the recoil speed of the hydrogen atom is nearly

Discussion

1875.	An organic compound contains 13% h2 52.2% carbon. If vd is 23 derive molecular formula of compound
Answer» An organic compound contains 13% h2 52.2% carbon. If vd is 23 derive molecular formula of compound

Discussion

1876.	What change in colour is observed when white silver chloride is left exposed to sunlight? What type of chemical reaction is this?
Answer» What change in colour is observed when white silver chloride is left exposed to sunlight? What type of chemical reaction is this?

Discussion

1877.	Calculate the enthalpy of vaporisation (in kJ/mol) for ethanol. Given, entropy change for the process is 109 J K−1 mol−1 and boiling point of ethanol is 78.5 oC.
Answer» Calculate the enthalpy of vaporisation (in $k J / m o l$ ) for ethanol. Given, entropy change for the process is $109 J K^{- 1} m o l^{- 1}$ and boiling point of ethanol is $78.5^{o} C .$

Discussion

1878.	A weak acid react with strong base ionisation cons†an t of weak acid is 10(-4) .find equibrium cons†an t for the reactio
Answer» A weak acid react with strong base ionisation cons†an t of weak acid is 10(-4) .find equibrium cons†an t for the reactio

Discussion

1879.	What does exactally happen with litmus paper when it is being dropped in either base or acid to change its colour
Answer» What does exactally happen with litmus paper when it is being dropped in either base or acid to change its colour

Discussion

1880.	What is the name of compound- Hg2I2
Answer» What is the name of compound- Hg₂I₂

1880.

What is the name of compound- Hg2I2

Answer»

What is the name of compound-

Hg₂I₂

Discussion

1881.	31.What is the atomicity of Nitrogen, Chlorine, Sulphur And Phosphorus
Answer» 31.What is the atomicity of Nitrogen, Chlorine, Sulphur And Phosphorus

Discussion

1882.	Classify the following as combustible and non-combustible substances- Paper, iron nails, cloth, glass.
Answer» Classify the following as combustible and non-combustible substances- Paper, iron nails, cloth, glass.

Discussion

1883.	Question 28In response to a question, a student stated that in an atom, the number of protons is greater than the number of neutrons, which in turn is greater than the number of electrons. Do you agree with the statement? Justify your answer.
Answer» Question 28 In response to a question, a student stated that in an atom, the number of protons is greater than the number of neutrons, which in turn is greater than the number of electrons. Do you agree with the statement? Justify your answer.

Discussion

1884.	How many double bonds are present in the molecule of HNO3?
Answer» How many double bonds are present in the molecule of $H N O_{3}$ ?

Discussion

1885.	Nylon is a polymer made of chemical units called ___ .
Answer» Nylon is a polymer made of chemical units called ___ .

Discussion

1886.	Question 5 (b) Give reason. LPG is a better domestic fuel than wood.
Answer» Question 5 (b) Give reason. LPG is a better domestic fuel than wood.

Discussion

1887.	if LPG cylinder contain mixture of butane and isobutane then the amount of oxygen that would be required for combustion of 1kg of it will be
Answer» if LPG cylinder contain mixture of butane and isobutane then the amount of oxygen that would be required for combustion of 1kg of it will be

Discussion

1888.	Incomplete burning of charcoal produces___(i)__ and __(ii)____ gases.
Answer» Incomplete burning of charcoal produces___(i)__ and __(ii)____ gases.

Discussion

1889.	10.66 g of a chromium (III) complex having molecular formula : CrCl3(H2O)6 when treated with excess AgNO3 solution, 11.48 g of white precepitate is obtained. How much water is lost by 133.25 g of the given complex (in g) when it is treated with conc. H2SO4? (Assume the complex is octahedral) Atomic mass of Cr=52 u and Ag=108 u)
Answer» $10.66 g$ of a chromium (III) complex having molecular formula : $C r C l_{3} (H_{2} O)_{6}$ when treated with excess $A g N O_{3}$ solution, $11.48 g$ of white precepitate is obtained. How much water is lost by $133.25 g$ of the given complex (in g) when it is treated with conc. $H_{2} S O_{4}$ ? (Assume the complex is octahedral) Atomic mass of $C r = 52 u$ and $A g = 108 u$ )

Discussion

1890.	86. A metal 'X' when dipped in aqueous solution of Aluminium sulphate no reaction is observed whereas when it is dipped in an aqueous solution of ferrous sulphate the pale green solution turns colourless.Identify X with reason.
Answer» 86. A metal 'X' when dipped in aqueous solution of Aluminium sulphate no reaction is observed whereas when it is dipped in an aqueous solution of ferrous sulphate the pale green solution turns colourless.Identify X with reason.

Discussion

1891.	Why is gold used for making jewellery?
Answer» Why is gold used for making jewellery?

Discussion

1892.	A number of little droplets of a liquid of surface tension T, density ρ , all of same radius r, combine to form a single of radius R. If the total energy released in this process is converted into kinetic energy of the bigger drop, velocity of the bigger drop it
Answer» A number of little droplets of a liquid of surface tension T, density $ρ$ , all of same radius r, combine to form a single of radius R. If the total energy released in this process is converted into kinetic energy of the bigger drop, velocity of the bigger drop it

Discussion

1893.	QAn air bubble is seen inside a solid sphere of glass(n=1.5) of 4cm diameter at a dis†an ce of 1cm from the surface of the sphere (on seeing along the diameter). Determine the real position of the bubble inside the sphere
Answer» QAn air bubble is seen inside a solid sphere of glass(n=1.5) of 4cm diameter at a dis†an ce of 1cm from the surface of the sphere (on seeing along the diameter). Determine the real position of the bubble inside the sphere

Discussion

1894.	which of the following bronsted acid has weakest conjugate base 1.H2O 2.HCN 3.HCOOH 4.HF
Answer» which of the following bronsted acid has weakest conjugate base 1.H2O 2.HCN 3.HCOOH 4.HF

Discussion

1895.	Substances A and B react with oxygen to form acidic oxide and basic oxide respectively. Oxides of A and B react with water to form X and Y respectively. Identify A, B, X, and Y.
Answer» Substances A and B react with oxygen to form acidic oxide and basic oxide respectively. Oxides of A and B react with water to form X and Y respectively. Identify A, B, X, and Y.

Discussion

1896.	___ is the phenomenon of diffusion of solvent molecules across a semi-permeable membrane.
Answer» ___ is the phenomenon of diffusion of solvent molecules across a semi-permeable membrane.

Discussion

1897.	Which of the following is not a synthetic fibre ?(a) nylon (b) flax (c) acrylic (d) polyester
Answer» Which of the following is not a synthetic fibre ? (a) nylon (b) flax (c) acrylic (d) polyester

1897.

Which of the following is not a synthetic fibre ?(a) nylon (b) flax (c) acrylic (d) polyester

Answer»

Which of the following is not a synthetic fibre ?

(a) nylon (b) flax (c) acrylic (d) polyester

Discussion

1898.	If Y = {x \| x is a positive factor of the number 2p – 1 (2p – 1), where 2p – 1 is aprime number}.Write Y in the roaster form.
Answer» If Y = {x \| x is a positive factor of the number 2p – 1 (2p – 1), where 2p – 1 is a prime number}.Write Y in the roaster form.

Discussion

1899.	Is Carbon Di oxide is added to lime water to check it's nature ?
Answer» Is Carbon Di oxide is added to lime water to check it's nature ?

Discussion

1900.	Total number of isotopes of hydrogen:-
Answer» Total number of isotopes of hydrogen:-

Discussion

Explore topic-wise InterviewSolutions in .

An object is taken to a height 2R above the surface of earth the increase in potential energy is

Prove me how metal carbonated / hydrogencarbonates + Acid ----> Salt + Water + CO2.

What are reduction reactions? Give examples.

consider an atom of li+2 which is a unielecton system and hence bohr's model is applicable to it . ehat is the binding energy of an electron in the first orbit of li+2

write five points of difference between combustible and non combustible substsnc

Question 1 (f)Which separation techniques will you apply for the separation of the following? f. Oil from water.

19.In a regular triangular bipyramidal mx5 the number of x_m_x bonds at 180 degree is

If a compound AB dissociates to the extent of 75% in an aqueous solution, the molality of the solution which shows a 1.82 K rise in the boiling point of the solution is(Given: Molal elevation constant for water =0.52K kg mol−1)

Fill in the blanks:(a) Burningof wood and coal causes _______ __of air.(b) Aliquid fuel used in homes is ___________.(c) Fuel must be heated to its ___________before it starts burning.(d) Fireproduced by oil cannot be controlled by _________.

I visited a grocery store to buy some food items, the moment I reached at the bill counter, the person processing the bill for me asked whether I needed a plastic bag and if I did then I would have to pay extra, when I asked him a reason for doing this, what might be the possible reason he gave me?

Can Combustion of methane be expressed in the form of oxidation number? How?

A large tank is filled with water upto height H. a small hole is made at the base of the tank.it takes T1 time to decrease height of water to H/x (x>1) and it takes T2 time to take out rest of the water .if T1=T2 then value of x is

When a metal is reacted with water. Among the following which gas will be liberated?

What is the valency of oxygen?

Why are young children advised to wear coloured clothes at night?

electronic confrigution of carbon

35. How to form lewis structure for compound like no2.

___ is the fixed path the electron takes while revolving around the nucleus

A water sample has ppm level concentration of the following metals: Fe=0.2;Mn=5.0;Cu=3.0;Zn=5.0. The metal that makes the water sample unsuitable for drinking is:

Increase in the average temperature of Earth's climate is called ______________.

Which among the following is the most reactive metal ? (a) copper (b) calcium (c) iron (d) magnesium

What is the rule for naming tricyclic compounds?

A chemical equation is written in the form of symbols and formulas.Justify this statement

A hydrogen atom emits a photon in going from n=3 to n=1 state. the recoil speed of the hydrogen atom is nearly

An organic compound contains 13% h2 52.2% carbon. If vd is 23 derive molecular formula of compound

What change in colour is observed when white silver chloride is left exposed to sunlight? What type of chemical reaction is this?

Calculate the enthalpy of vaporisation (in kJ/mol) for ethanol. Given, entropy change for the process is 109 J K−1 mol−1 and boiling point of ethanol is 78.5 oC.

A weak acid react with strong base ionisation cons†an t of weak acid is 10(-4) .find equibrium cons†an t for the reactio

What does exactally happen with litmus paper when it is being dropped in either base or acid to change its colour

What is the name of compound- Hg2I2

31.What is the atomicity of Nitrogen, Chlorine, Sulphur And Phosphorus

Classify the following as combustible and non-combustible substances- Paper, iron nails, cloth, glass.

Question 28In response to a question, a student stated that in an atom, the number of protons is greater than the number of neutrons, which in turn is greater than the number of electrons. Do you agree with the statement? Justify your answer.

How many double bonds are present in the molecule of HNO3?

Nylon is a polymer made of chemical units called ___ .

Question 5 (b) Give reason. LPG is a better domestic fuel than wood.

if LPG cylinder contain mixture of butane and isobutane then the amount of oxygen that would be required for combustion of 1kg of it will be

Incomplete burning of charcoal produces___(i)__ and __(ii)____ gases.

86. A metal 'X' when dipped in aqueous solution of Aluminium sulphate no reaction is observed whereas when it is dipped in an aqueous solution of ferrous sulphate the pale green solution turns colourless.Identify X with reason.

Why is gold used for making jewellery?

A number of little droplets of a liquid of surface tension T, density ρ , all of same radius r, combine to form a single of radius R. If the total energy released in this process is converted into kinetic energy of the bigger drop, velocity of the bigger drop it

QAn air bubble is seen inside a solid sphere of glass(n=1.5) of 4cm diameter at a dis†an ce of 1cm from the surface of the sphere (on seeing along the diameter). Determine the real position of the bubble inside the sphere

which of the following bronsted acid has weakest conjugate base 1.H2O 2.HCN 3.HCOOH 4.HF

Substances A and B react with oxygen to form acidic oxide and basic oxide respectively. Oxides of A and B react with water to form X and Y respectively. Identify A, B, X, and Y.

___ is the phenomenon of diffusion of solvent molecules across a semi-permeable membrane.

Which of the following is not a synthetic fibre ?(a) nylon (b) flax (c) acrylic (d) polyester

If Y = {x | x is a positive factor of the number 2p – 1 (2p – 1), where 2p – 1 is aprime number}.Write Y in the roaster form.

Is Carbon Di oxide is added to lime water to check it's nature ?

Total number of isotopes of hydrogen:-

Fill in the blanks:(a) Burningof wood and coal causes _ of air.(b) Aliquid fuel used in homes is _.(c) Fuel must be heated to its _before it starts burning.(d) Fireproduced by oil cannot be controlled by _____.

Incomplete burning of charcoal produces_(i) and (ii)__ gases.