10223 + Interview Questions in Chemistry Page 40 InterviewSolution

1951.	Potassium reacts with water to produce _______ flame.
Answer» Potassium reacts with water to produce _______ flame.

Discussion

1952.	Explain way, we can easily move our hand in air but to do the same through a plank of wood, we need a karate expert.
Answer» Explain way, we can easily move our hand in air but to do the same through a plank of wood, we need a karate expert.

Discussion

1953.	The number of electrons in oxygen atom in0.3 gmolecules of mohr's salt\lbrack FESO4(NH)2SO4, 6H2O\rbrack is
Answer» The number of electrons in oxygen atom in0.3 gmolecules of mohr's salt\lbrack FESO4(NH)2SO4, 6H2O\rbrack is

Discussion

1954.	What is the chemical formula and symbol of sulphur respectively?
Answer» What is the chemical formula and symbol of sulphur respectively?

Discussion

1955.	For a first order reaction (A) gives products , the concentration A changes from 0.1 M to 0.025 M in 40 minutes . The rate of reaction when the concentration of A is 0.01 M is
Answer» For a first order reaction (A) gives products , the concentration A changes from 0.1 M to 0.025 M in 40 minutes . The rate of reaction when the concentration of A is 0.01 M is

Discussion

1956.	5 Whatvis angular momentum of an orbital ?
Answer» 5 Whatvis angular momentum of an orbital ?

Discussion

1957.	how can manganese get an oxidation number of +4 in mno2
Answer» how can manganese get an oxidation number of +4 in mno2

Discussion

1958.	At 25 ∘C, the solubility product (Ksp) of CaF2 in water is 3.2×10−11 mol3 L−3. The solubility (in mole per litre) of the salt at the same temperature (ignore ion pairing) is:
Answer» At $25^{\circ} C,$ the solubility product $(K_{s p})$ of $C a F_{2}$ in water is $3.2 \times 10^{- 11} {mol}^{3} L^{- 3} .$ The solubility (in mole per litre) of the salt at the same temperature (ignore ion pairing) is:

Discussion

1959.	A molecule of ammonia (NH3) contains only single bonds. Explain the reason. [5 Marks]
Answer» A molecule of ammonia $({NH}_{3})$ contains only single bonds. Explain the reason. [5 Marks]

Discussion

1960.	Calculate the mass of:(a) 0.2 mole of the elemental oxygen atoms(b) 0.5 mole of water molecules
Answer» Calculate the mass of: (a) 0.2 mole of the elemental oxygen atoms (b) 0.5 mole of water molecules

Discussion

1961.	Explain the octet rule for the formation of a molecule of sodium chloride from sodium and chlorine atoms.
Answer» Explain the octet rule for the formation of a molecule of sodium chloride from sodium and chlorine atoms.

Discussion

1962.	Question 6(c)Calculate the molar mass of the following substances:(c) Phosphorus molecule, P4 (atomic mass of phosphorus = 31)
Answer» Question 6(c) Calculate the molar mass of the following substances: (c) Phosphorus molecule, $P_{4}$ (atomic mass of phosphorus = 31)

Discussion

1963.	Which of the following compound is planar and non-polar?
Answer» Which of the following compound is planar and non-polar?

Discussion

1964.	44.decomposition reaction
Answer» 44.decomposition reaction

Discussion

1965.	For the reaction N2 +O2=2NO. Kc=2. Degree of association is
Answer» For the reaction N2 +O2=2NO. Kc=2. Degree of association is

Discussion

1966.	Write the chemical equations for the following activities.(a) NaOH solution was added to HCl solution.(b) Zinc dust was added to dilute H2 SO4 .(c) Dilute nitric acid was added to calcium oxide.(e) Carbon dioxide gas was passed through KOH solution.(f) Dilute HCl was poured on baking soda.
Answer» Write the chemical equations for the following activities. (a) NaOH solution was added to HCl solution. (b) Zinc dust was added to dilute H₂ SO₄ . (c) Dilute nitric acid was added to calcium oxide. (e) Carbon dioxide gas was passed through KOH solution. (f) Dilute HCl was poured on baking soda.

Discussion

1967.	__ is the international organization who approves names of elements. (Write only the abbreviation)
Answer» __ is the international organization who approves names of elements. (Write only the abbreviation)

Discussion

1968.	What is pure?
Answer» What is pure?

Discussion

1969.	27. Find the product C2H5cl------- with KCN. A
Answer» 27. Find the product C2H5cl------- with KCN. A

Discussion

1970.	Define the Bose Einstein Condensate?
Answer» Define the Bose Einstein Condensate?

Discussion

1971.	the temperature at which methane molecules have same average kinetic energy as that of oxygen molecules at 27^°
Answer» the temperature at which methane molecules have same average kinetic energy as that of oxygen molecules at 27^°

Discussion

1972.	Which of the following statement(s) is/are true?
Answer» Which of the following statement(s) is/are true?

Discussion

1973.

A solution of hydrogen chloride in water is prepared. The following substances are added to separate portions of the solution: S.No. Substances added Gas evolved Odour 1. 2. 3. 4. Calcium carbonate Magnesium ribbon Manganese (IV) oxide with heating Sodium sulphide _ _ _ _ _ _ _ _

Answer» A solution of hydrogen chloride in water is prepared. The following substances are added to separate portions of the solution:

S.No.	Substances added	Gas evolved	Odour
1. 2. 3. 4.	Calcium carbonate Magnesium ribbon Manganese (IV) oxide with heating Sodium sulphide	___ ___ ___ ___	___ ___ ___ ___

Discussion

1974.	You enter a laboratory after a class has completed the Fountain Experiment. How will you be able to tell whether the gas used in the experiment was hydrogen chloride or ammonia?
Answer» You enter a laboratory after a class has completed the Fountain Experiment. How will you be able to tell whether the gas used in the experiment was hydrogen chloride or ammonia?

Discussion

1975.	Figure shows a roughly approximated curve of binding energy per nucleon with mass number. W,X,Y and Z are four nuclei indicated on the curve. According to this curve, the process that would release energy is:
Answer» Figure shows a roughly approximated curve of binding energy per nucleon with mass number. $W, X, Y$ and $Z$ are four nuclei indicated on the curve. According to this curve, the process that would release energy is:

Discussion

1976.	What is the formula to find the energy of an arbit in an atom
Answer» What is the formula to find the energy of an arbit in an atom

Discussion

1977.	Question 38Enlist the conclusions drawn by Rutherford from his a-ray scattering experiment.
Answer» Question 38 Enlist the conclusions drawn by Rutherford from his a-ray scattering experiment.

Discussion

1978.	The Henry's law constant for the solubility of N2 gas in water at 298 K is 1.0×105 atm. The mole fraction of N2 in air is 0.8. The number of moles of N2 from air that dissolves in 10 moles of water at 298 K and 5 atm pressure is:
Answer» The Henry's law constant for the solubility of $N_{2}$ gas in water at $298 K$ is $1.0 \times 10^{5}$ atm. The mole fraction of $N_{2}$ in air is $0.8$ . The number of moles of $N_{2}$ from air that dissolves in $10$ moles of water at $298 K$ and $5$ atm pressure is:

Discussion

1979.	Consider the following two situations, in which case the volume of sponge will be more? Situation 1: Sponge on a table Situation 2: Sponge wet by water
Answer» Consider the following two situations, in which case the volume of sponge will be more? Situation 1: Sponge on a table Situation 2: Sponge wet by water

1979.

Consider the following two situations, in which case the volume of sponge will be more? Situation 1: Sponge on a table Situation 2: Sponge wet by water

Answer»

Consider the following two situations, in which case the volume of sponge will be more?

Situation 1: Sponge on a table

Situation 2: Sponge wet by water

Discussion

1980.	The melting point of carbon dioxide gas is _____.
Answer» The melting point of carbon dioxide gas is _____.

Discussion

1981.	Evaporation of a liquid takes place at temperature:
Answer» Evaporation of a liquid takes place at temperature:

Discussion

1982.	Find number of h atoms in 4g CH4
Answer» Find number of h atoms in 4g CH4

Discussion

1983.	Identify the correct dot structure of O2 molecule?
Answer» Identify the correct dot structure of $O_{2}$ molecule?

Discussion

1984.	find the nearest distance between two cations in BCC arrangement
Answer» find the nearest distance between two cations in BCC arrangement

Discussion

1985.	What are the physical states of dispersed phase and dispersion medium of a cloud?
Answer» What are the physical states of dispersed phase and dispersion medium of a cloud?

Discussion

1986.	Question 6:How can you say that the explosion of a cracker is a chemical change? Explain.
Answer» Question 6: How can you say that the explosion of a cracker is a chemical change? Explain.

Discussion

1987.	What cause more severe burns, steam or boiling water
Answer» What cause more severe burns, steam or boiling water

Discussion

1988.	The ionization potential of lithium is 520kj/mole. The energy required to convert 70mgof lithium atom in gaseous state into Li+ ions is
Answer» The ionization potential of lithium is 520kj/mole. The energy required to convert 70mgof lithium atom in gaseous state into Li+ ions is

Discussion

1989.	Complete reaction of 2.0 g of calcium (at. wt. = 40) with excess HCL produces 1.125 L of H2 gas. Complete reaction of the same quantity of another metal "M" with excess HCL produces 1.85 L of H2 gas under identical conditions. The equivalent weight of "M" is closest to
Answer» Complete reaction of 2.0 g of calcium (at. wt. = 40) with excess HCL produces 1.125 L of $H_{2}$ gas. Complete reaction of the same quantity of another metal "M" with excess HCL produces 1.85 L of $H_{2}$ gas under identical conditions. The equivalent weight of "M" is closest to

Discussion

1990.	Question 8Rutherford's a-particle scattering experiment showed that(i) electrons have negative charge.(ii) the mass and positive charge of the atom is concentrated in the nucleus.(iii) neutron exists in the nucleus.(iv) most of the space in atom is empty.Which of the above statements are correct?(a) (i) and (iii)(b) (ii) and (iv)(c) (i) and (iv)(d) (iii) and (iv)
Answer» Question 8 Rutherford's a-particle scattering experiment showed that (i) electrons have negative charge. (ii) the mass and positive charge of the atom is concentrated in the nucleus. (iii) neutron exists in the nucleus. (iv) most of the space in atom is empty. Which of the above statements are correct? (a) (i) and (iii) (b) (ii) and (iv) (c) (i) and (iv) (d) (iii) and (iv)

Discussion

1991.	How many moles of nitrogen (N2) are required to produce 10 moles of ammonia (NH3) by reaction with hydrogen (H2)?5
Answer» How many moles of nitrogen ( $N_{2}$ ) are required to produce 10 moles of ammonia ( ${NH}_{3}$ ) by reaction with hydrogen ( $H_{2}$ )? 5

Discussion

1992.	which allotrope of sulphur is most reactive
Answer» which allotrope of sulphur is most reactive

Discussion

1993.	Matter is _________ in nature.
Answer» Matter is _________ in nature.

Discussion

1994.	According to the theory of relativity , if an object travels at the speed of light it's mass increases . Then what about the photons that experiences this phenomen ?
Answer» According to the theory of relativity , if an object travels at the speed of light it's mass increases . Then what about the photons that experiences this phenomen ?

Discussion

1995.	Water kept in sunlight gets heat from the sun and is evaporated. But how does water kept under the shade of a tree also get evaporated? Explain.
Answer» Water kept in sunlight gets heat from the sun and is evaporated. But how does water kept under the shade of a tree also get evaporated? Explain.

Discussion

1996.	When zinc metal is heated with caustic soda solution, the gas evolved is :(1) hydrogen(2) carbon dioxide(3) oxygen(4) hydrogen choride
Answer» When zinc metal is heated with caustic soda solution, the gas evolved is : (1) hydrogen (2) carbon dioxide (3) oxygen (4) hydrogen choride

Discussion

1997.	The symbol/symbols used to express Avogadro number is/are
Answer» The symbol/symbols used to express Avogadro number is/are

Discussion

1998.	all the elements in the third periodic table have (1) three complete shells (2) three compleye subshells (3) three valence electron
Answer» all the elements in the third periodic table have (1) three complete shells (2) three compleye subshells (3) three valence electron

Discussion

1999.	in an atomic orbital,the sign of lobes indicate the
Answer» in an atomic orbital,the sign of lobes indicate the

Discussion

2000.	Question 10Explain the formation of scum when hard water is treated with soap.
Answer» Question 10 Explain the formation of scum when hard water is treated with soap.

Discussion

Explore topic-wise InterviewSolutions in .

Potassium reacts with water to produce _______ flame.

Explain way, we can easily move our hand in air but to do the same through a plank of wood, we need a karate expert.

The number of electrons in oxygen atom in0.3 gmolecules of mohr's salt\lbrack FESO4(NH)2SO4, 6H2O\rbrack is

What is the chemical formula and symbol of sulphur respectively?

For a first order reaction (A) gives products , the concentration A changes from 0.1 M to 0.025 M in 40 minutes . The rate of reaction when the concentration of A is 0.01 M is

5 Whatvis angular momentum of an orbital ?

how can manganese get an oxidation number of +4 in mno2

At 25 ∘C, the solubility product (Ksp) of CaF2 in water is 3.2×10−11 mol3 L−3. The solubility (in mole per litre) of the salt at the same temperature (ignore ion pairing) is:

A molecule of ammonia (NH3) contains only single bonds. Explain the reason. [5 Marks]

Calculate the mass of:(a) 0.2 mole of the elemental oxygen atoms(b) 0.5 mole of water molecules

Explain the octet rule for the formation of a molecule of sodium chloride from sodium and chlorine atoms.

Question 6(c)Calculate the molar mass of the following substances:(c) Phosphorus molecule, P4 (atomic mass of phosphorus = 31)

Which of the following compound is planar and non-polar?

44.decomposition reaction

For the reaction N2 +O2=2NO. Kc=2. Degree of association is

Write the chemical equations for the following activities.(a) NaOH solution was added to HCl solution.(b) Zinc dust was added to dilute H2 SO4 .(c) Dilute nitric acid was added to calcium oxide.(e) Carbon dioxide gas was passed through KOH solution.(f) Dilute HCl was poured on baking soda.

__ is the international organization who approves names of elements. (Write only the abbreviation)

What is pure?

27. Find the product C2H5cl------- with KCN. A

Define the Bose Einstein Condensate?

the temperature at which methane molecules have same average kinetic energy as that of oxygen molecules at 27^°

Which of the following statement(s) is/are true?

A solution of hydrogen chloride in water is prepared. The following substances are added to separate portions of the solution: S.No. Substances added Gas evolved Odour 1. 2. 3. 4. Calcium carbonate Magnesium ribbon Manganese (IV) oxide with heating Sodium sulphide ___ ___ ___ ___ ___ ___ ___ ___

You enter a laboratory after a class has completed the Fountain Experiment. How will you be able to tell whether the gas used in the experiment was hydrogen chloride or ammonia?

Figure shows a roughly approximated curve of binding energy per nucleon with mass number. W,X,Y and Z are four nuclei indicated on the curve. According to this curve, the process that would release energy is:

What is the formula to find the energy of an arbit in an atom

Question 38Enlist the conclusions drawn by Rutherford from his a-ray scattering experiment.

The Henry's law constant for the solubility of N2 gas in water at 298 K is 1.0×105 atm. The mole fraction of N2 in air is 0.8. The number of moles of N2 from air that dissolves in 10 moles of water at 298 K and 5 atm pressure is:

Consider the following two situations, in which case the volume of sponge will be more? Situation 1: Sponge on a table Situation 2: Sponge wet by water

The melting point of carbon dioxide gas is _____.

Evaporation of a liquid takes place at temperature:

Find number of h atoms in 4g CH4

Identify the correct dot structure of O2 molecule?

find the nearest distance between two cations in BCC arrangement

What are the physical states of dispersed phase and dispersion medium of a cloud?

Question 6:How can you say that the explosion of a cracker is a chemical change? Explain.

What cause more severe burns, steam or boiling water

The ionization potential of lithium is 520kj/mole. The energy required to convert 70mgof lithium atom in gaseous state into Li+ ions is

Complete reaction of 2.0 g of calcium (at. wt. = 40) with excess HCL produces 1.125 L of H2 gas. Complete reaction of the same quantity of another metal "M" with excess HCL produces 1.85 L of H2 gas under identical conditions. The equivalent weight of "M" is closest to

How many moles of nitrogen (N2) are required to produce 10 moles of ammonia (NH3) by reaction with hydrogen (H2)?5

which allotrope of sulphur is most reactive

Matter is _________ in nature.

According to the theory of relativity , if an object travels at the speed of light it's mass increases . Then what about the photons that experiences this phenomen ?

Water kept in sunlight gets heat from the sun and is evaporated. But how does water kept under the shade of a tree also get evaporated? Explain.

When zinc metal is heated with caustic soda solution, the gas evolved is :(1) hydrogen(2) carbon dioxide(3) oxygen(4) hydrogen choride

The symbol/symbols used to express Avogadro number is/are

all the elements in the third periodic table have (1) three complete shells (2) three compleye subshells (3) three valence electron

in an atomic orbital,the sign of lobes indicate the

Question 10Explain the formation of scum when hard water is treated with soap.

A solution of hydrogen chloride in water is prepared. The following substances are added to separate portions of the solution: S.No. Substances added Gas evolved Odour 1. 2. 3. 4. Calcium carbonate Magnesium ribbon Manganese (IV) oxide with heating Sodium sulphide _ _ _ _ _ _ _ _