10223 + Interview Questions in Chemistry Page 103 InterviewSolution

5101.	when a metallic surface is illuminated with light of wavelength lambda, the stopping potential is x volt. when the same surface is illuminated by light of wavelength 2lambda, the stopping potential is x÷3. the threshold wavelength for the metallic surface
Answer» when a metallic surface is illuminated with light of wavelength lambda, the stopping potential is x volt. when the same surface is illuminated by light of wavelength 2lambda, the stopping potential is x÷3. the threshold wavelength for the metallic surface

Discussion

5102.	Why do the radioactive elements emit radiations,that is the rays??
Answer» Why do the radioactive elements emit radiations,that is the rays??

Discussion

5103.	What is a reversible change? Give an example. [2 MARKS]
Answer» What is a reversible change? Give an example. [2 MARKS]

Discussion

5104.	The ionisation energy of H - atom is 13.6 eV. What will be the ionisation energy (in eV) of Li2+ ion
Answer» The ionisation energy of $H$ - atom is $13.6$ eV. What will be the ionisation energy (in eV) of $L i^{2 +}$ ion

Discussion

5105.	(a) Compare the properties of solids, liquids and gases in tabular form. (b) Give two reasons for saying that wood is a solid.
Answer» (a) Compare the properties of solids, liquids and gases in tabular form. (b) Give two reasons for saying that wood is a solid.

5105.

(a) Compare the properties of solids, liquids and gases in tabular form. (b) Give two reasons for saying that wood is a solid.

Answer»

(a) Compare the properties of solids, liquids and gases in tabular form.

(b) Give two reasons for saying that wood is a solid.

Discussion

5106.	The variation of density (ρ) with temperature (T) of an ideal gas of molecular mass (M) at constant pressure is plotted as shown in figure.The pressure of the gas at state P is RT2√KMThe value of K is
Answer» The variation of density $(ρ)$ with temperature (T) of an ideal gas of molecular mass (M) at constant pressure is plotted as shown in figure. The pressure of the gas at state P is $\frac{R T^{2}}{\sqrt{K} M}$ The value of K is

Discussion

5107.	Identify the combination reaction(s) among the following:
Answer» Identify the combination reaction(s) among the following:

Discussion

5108.	What is leptons and mesons
Answer» What is leptons and mesons

Discussion

5109.	Question 8 (e) Identify the solutions among the following mixtures. e. Soda water
Answer» Question 8 (e) Identify the solutions among the following mixtures. e. Soda water

Discussion

5110.	A rubber band can change its shape on stretching will you classify as solid or not
Answer» A rubber band can change its shape on stretching will you classify as solid or not

Discussion

5111.	The element which exists as a liquid upto 2000∘C & can be used in high temperature thermometry is
Answer» The element which exists as a liquid upto $2000^{\circ} C &$ can be used in high temperature thermometry is

Discussion

5112.	In brown ring test, which compound is responsible for ring formation?
Answer» In brown ring test, which compound is responsible for ring formation?

Discussion

5113.	Question 5 (a)Give the names of the elements present in the following compounds:(a) Quick lime
Answer» Question 5 (a) Give the names of the elements present in the following compounds: (a) Quick lime

Discussion

5114.	(a) What is an acid-base indicator? Name the three common indicators used in chemistry laboratory.(b) Name an acid-base indicator extracted from lichen.(c) What colour does the methyl orange turn to when put in an acidic solution ?
Answer» (a) What is an acid-base indicator? Name the three common indicators used in chemistry laboratory. (b) Name an acid-base indicator extracted from lichen. (c) What colour does the methyl orange turn to when put in an acidic solution ?

5114.

(a) What is an acid-base indicator? Name the three common indicators used in chemistry laboratory.(b) Name an acid-base indicator extracted from lichen.(c) What colour does the methyl orange turn to when put in an acidic solution ?

Answer»

(a) What is an acid-base indicator? Name the three common indicators used in chemistry laboratory.

(b) Name an acid-base indicator extracted from lichen.

(c) What colour does the methyl orange turn to when put in an acidic solution ?

Discussion

5115.	What is the maximum number of lines of spectrum we get if an electron jump from 6th orbit to ground state of hydrogen?
Answer» What is the maximum number of lines of spectrum we get if an electron jump from 6th orbit to ground state of hydrogen?

Discussion

5116.	Identify the odd one out:1. Mercury, Gold, Brass, Nitrogen2. Lemon juice, Carbon, Brass, Milk
Answer» Identify the odd one out: 1. Mercury, Gold, Brass, Nitrogen 2. Lemon juice, Carbon, Brass, Milk

5116.

Identify the odd one out:1. Mercury, Gold, Brass, Nitrogen2. Lemon juice, Carbon, Brass, Milk

Answer»

Identify the odd one out:

1. Mercury, Gold, Brass, Nitrogen

2. Lemon juice, Carbon, Brass, Milk

Discussion

5117.	Consider the following reaction.Number of different monobromo products obtained in the given reaction are (Considering allylic substitution only):
Answer» Consider the following reaction. Number of different monobromo products obtained in the given reaction are (Considering allylic substitution only):

Discussion

5118.	The relative density of silver is 10.8. The density of silver is .
Answer» The relative density of silver is 10.8. The density of silver is .

Discussion

5119.	A student heats calculated amounts of iron filings and sulphur powder together in a boiling tube. He will obtain :(1) a homogeneous mixture of Fe and S(2) a heterogeneous compound of Fe and S(3) a homogeneous compound of FeS(4) a heterogeneous mixture of FeS, Fe and S
Answer» A student heats calculated amounts of iron filings and sulphur powder together in a boiling tube. He will obtain : (1) a homogeneous mixture of Fe and S (2) a heterogeneous compound of Fe and S (3) a homogeneous compound of FeS (4) a heterogeneous mixture of FeS, Fe and S

Discussion

5120.	Describe the various steps involved in the separation of iodine, iron fillings and salt from a mixture.
Answer» Describe the various steps involved in the separation of iodine, iron fillings and salt from a mixture.

Discussion

5121.	Gases evolved during the thermal decomposition of mercuric nitrate Hg(NO3)2 are:
Answer» Gases evolved during the thermal decomposition of mercuric nitrate $H g (N O_{3})_{2}$ are:

Discussion

5122.	If salt is added to water is the mixture homogeneous or heterogeneous.give reasons for ur anwer.
Answer» If salt is added to water is the mixture homogeneous or heterogeneous.give reasons for ur anwer.

Discussion

5123.	You have one glass of water and some sugar and sand. How will you create a homogenous mixture?
Answer» You have one glass of water and some sugar and sand. How will you create a homogenous mixture?

Discussion

5124.	if an object weighs 80 gm in air 68 gm in water and 60gm in oil.calculate the relative density of oil.
Answer» if an object weighs 80 gm in air 68 gm in water and 60gm in oil.calculate the relative density of oil.

Discussion

5125.	List the properties of polyester fibre.
Answer» List the properties of polyester fibre.

Discussion

5126.	oxidation number of A ,B ,C are +2 +5 -2 resp .possible formula of the compound is?
Answer» oxidation number of A ,B ,C are +2 +5 -2 resp .possible formula of the compound is?

Discussion

5127.	ntTriad-I [N3-,O2-, Na+]n ntTriad-II [N+,C+, O+]n ntChhose the species of lowest ionization potential from Triad-I and highest IP from Triad-II respectivelyn nt(a) N3-, O+n nt(b)N3-, N+n
Answer» ntTriad-I [N3-,O2-, Na+]n ntTriad-II [N+,C+, O+]n ntChhose the species of lowest ionization potential from Triad-I and highest IP from Triad-II respectivelyn nt(a) N3-, O+n nt(b)N3-, N+n

Discussion

5128.	State the universal law of gravitation. The mass of the electron and proton in a Hydrogen atom is given by 9×10-31 Kg and 1.9×10-27 Kg respectively which is separated by a distance 6×10-11m. Calculate the gravitational force of attraction between them? [3 MARKS]
Answer» State the universal law of gravitation. The mass of the electron and proton in a Hydrogen atom is given by 9×10^-31 Kg and 1.9×10^-27 Kg respectively which is separated by a distance 6×10^-11m. Calculate the gravitational force of attraction between them? [3 MARKS]

Discussion

5129.	Classify the following as physical and chemical changes: (i) Cleaning with soap and water (ii) Cooking chicken (iii) Formation of clouds (iv) Making ice candy
Answer» Classify the following as physical and chemical changes: (i) Cleaning with soap and water (ii) Cooking chicken (iii) Formation of clouds (iv) Making ice candy

Discussion

5130.	103. A 5 watt source emits monochromatic light of wavelength 5000A^° .when placed 0.5 m away, it liberates photoelectrons from a photosensitive metallic surface. When the source is moved to a distance of 1.0 m, the number of photoelectrons liberated will be reduced by a factor of 1) 8 2) 16 3) 2 4) 4
Answer» 103. A 5 watt source emits monochromatic light of wavelength 5000A^° .when placed 0.5 m away, it liberates photoelectrons from a photosensitive metallic surface. When the source is moved to a distance of 1.0 m, the number of photoelectrons liberated will be reduced by a factor of 1) 8 2) 16 3) 2 4) 4

Discussion

5131.	Which of the following is a property of Hydrogen?
Answer» Which of the following is a property of Hydrogen?

Discussion

5132.	The atom that accepts electrons is said to have a __ valency.
Answer» The atom that accepts electrons is said to have a __ valency.

Discussion

5133.	A radioactive nucleus A with a half life T, decays into a nucleus B. At t=0, there is no nucleus B. At sometime t, the ratio of the number of B to that of A is 0.3. Then, t is given by
Answer» A radioactive nucleus $A$ with a half life $T$ , decays into a nucleus $B$ . At $t = 0$ , there is no nucleus $B$ . At sometime $t$ , the ratio of the number of $B$ to that of $A$ is $0.3$ . Then, $t$ is given by

Discussion

5134.	What is difference between gas and plasma?
Answer» What is difference between gas and plasma?

Discussion

5135.	If the wave number of 1st line of Balmer series of hydrogen atom is ‘x’ then the wave number of 1st line of Lyman series of He+ ion will be
Answer» If the wave number of $1^{s t}$ line of Balmer series of hydrogen atom is ‘x’ then the wave number of $1^{s t}$ line of Lyman series of $H e^{+}$ ion will be

Discussion

5136.	{ Q }10/15 10 L of gaseous mixture at STP contains }}{NH_3 and }NO_2 gas is 2:3 by volume. Ratio of their }} Nitrogen atoms will be
Answer» { Q }10/15 10 L of gaseous mixture at STP contains }}{NH_3 and }NO_2 gas is 2:3 by volume. Ratio of their }} Nitrogen atoms will be

Discussion

5137.	Oxidation state of oxygen in Tribromo Octaoxide (Br3O8) isOptions:16/3–2+2-16/3
Answer» Oxidation state of oxygen in Tribromo Octaoxide (Br3O8) is Options: 16/3 –2 +2 -16/3

Discussion

5138.	What are the physical states of dispersed phase and dispersion medium of a jelly, cheese and butter?
Answer» What are the physical states of dispersed phase and dispersion medium of a jelly, cheese and butter?

Discussion

5139.	Q. In presence of a strong oxidising agent As2S3 is oxidised to arsinate and sulphate. What is the n-factor of As2S3.(1) 4 (2) 18(3) 28 (4) 24
Answer» Q. In presence of a strong oxidising agent As2S3 is oxidised to arsinate and sulphate. What is the n-factor of As2S3. (1) 4 (2) 18 (3) 28 (4) 24

Discussion

5140.	0.8 mole of a mixture of O_{2 }and CO_2 requires exactly 40 gram of NaOH in solution for complete conversion of all the CO_2 into Na_2CO_3 , if the mixture (0.8 mole) is completely oxidised to CO_2 ? (a) 0.2 (b) 0.6 (c) 1 (d) 1.5
Answer» 0.8 mole of a mixture of O_{2 }and CO_2 requires exactly 40 gram of NaOH in solution for complete conversion of all the CO_2 into Na_2CO_3 , if the mixture (0.8 mole) is completely oxidised to CO_2 ? (a) 0.2 (b) 0.6 (c) 1 (d) 1.5

Discussion

5141.	Which of the following curve assures that the metal obtained by carbon reduction is in the vapour state?
Answer» Which of the following curve assures that the metal obtained by carbon reduction is in the vapour state?

Discussion

5142.	Name the gas which produces anode rays consisting of protons in the discharge tube experiment.
Answer» Name the gas which produces anode rays consisting of protons in the discharge tube experiment.

Discussion

5143.	What is the maximum number of electrons an M shell of the atom can accomodate?
Answer» What is the maximum number of electrons an M shell of the atom can accomodate?

Discussion

5144.	Why we cannot separates azeotrophs from fractional distillation
Answer» Why we cannot separates azeotrophs from fractional distillation

Discussion

5145.	The smallest building block of any substance is ______
Answer» The smallest building block of any substance is ______

Discussion

5146.	Name an isotope of an element which is used as reference for atomic mass unit.
Answer» Name an isotope of an element which is used as reference for atomic mass unit.

Discussion

5147.	Elements A, B and C have atomic numbers 17, 19 and 10 respectively. State which one is: i) A non-metal ii) A metal iii) Chemically inert.
Answer» Elements A, B and C have atomic numbers 17, 19 and 10 respectively. State which one is: i) A non-metal ii) A metal iii) Chemically inert.

Discussion

5148.	mole fraction of gas in water is 0.001at stp determine henrys law cons†an t
Answer» mole fraction of gas in water is 0.001at stp determine henrys law cons†an t

Discussion

5149.	The electronic configuration of an element is 1s^{2 }2s^2 2p^63s^2 3p^{3 }. what is the atomic number of thevelement ,which is just below the above element in the periodic table
Answer» The electronic configuration of an element is 1s^{2 }2s^2 2p^63s^2 3p^{3 }. what is the atomic number of thevelement ,which is just below the above element in the periodic table

Discussion

5150.	Calculate the concentration in terms of mass by volume percentage of the solution containing, 3 g of potassium chloride in 75 ml of potassium chloride (KCl) solution.
Answer» Calculate the concentration in terms of mass by volume percentage of the solution containing, $3 g$ of potassium chloride in $75 ml$ of potassium chloride $(K C l)$ solution.

Discussion

Explore topic-wise InterviewSolutions in .

when a metallic surface is illuminated with light of wavelength lambda, the stopping potential is x volt. when the same surface is illuminated by light of wavelength 2lambda, the stopping potential is x÷3. the threshold wavelength for the metallic surface

Why do the radioactive elements emit radiations,that is the rays??

What is a reversible change? Give an example. [2 MARKS]

The ionisation energy of H - atom is 13.6 eV. What will be the ionisation energy (in eV) of Li2+ ion

(a) Compare the properties of solids, liquids and gases in tabular form. (b) Give two reasons for saying that wood is a solid.

The variation of density (ρ) with temperature (T) of an ideal gas of molecular mass (M) at constant pressure is plotted as shown in figure.The pressure of the gas at state P is RT2√KMThe value of K is

Identify the combination reaction(s) among the following:

What is leptons and mesons

Question 8 (e) Identify the solutions among the following mixtures. e. Soda water

A rubber band can change its shape on stretching will you classify as solid or not

The element which exists as a liquid upto 2000∘C &amp; can be used in high temperature thermometry is

In brown ring test, which compound is responsible for ring formation?

Question 5 (a)Give the names of the elements present in the following compounds:(a) Quick lime

(a) What is an acid-base indicator? Name the three common indicators used in chemistry laboratory.(b) Name an acid-base indicator extracted from lichen.(c) What colour does the methyl orange turn to when put in an acidic solution ?

What is the maximum number of lines of spectrum we get if an electron jump from 6th orbit to ground state of hydrogen?

Identify the odd one out:1. Mercury, Gold, Brass, Nitrogen2. Lemon juice, Carbon, Brass, Milk

Consider the following reaction.Number of different monobromo products obtained in the given reaction are (Considering allylic substitution only):

The relative density of silver is 10.8. The density of silver is .

A student heats calculated amounts of iron filings and sulphur powder together in a boiling tube. He will obtain :(1) a homogeneous mixture of Fe and S(2) a heterogeneous compound of Fe and S(3) a homogeneous compound of FeS(4) a heterogeneous mixture of FeS, Fe and S

Describe the various steps involved in the separation of iodine, iron fillings and salt from a mixture.

Gases evolved during the thermal decomposition of mercuric nitrate Hg(NO3)2 are:

If salt is added to water is the mixture homogeneous or heterogeneous.give reasons for ur anwer.

You have one glass of water and some sugar and sand. How will you create a homogenous mixture?

if an object weighs 80 gm in air 68 gm in water and 60gm in oil.calculate the relative density of oil.

List the properties of polyester fibre.

oxidation number of A ,B ,C are +2 +5 -2 resp .possible formula of the compound is?

ntTriad-I [N3-,O2-, Na+]n ntTriad-II [N+,C+, O+]n ntChhose the species of lowest ionization potential from Triad-I and highest IP from Triad-II respectivelyn nt(a) N3-, O+n nt(b)N3-, N+n

State the universal law of gravitation. The mass of the electron and proton in a Hydrogen atom is given by 9×10-31 Kg and 1.9×10-27 Kg respectively which is separated by a distance 6×10-11m. Calculate the gravitational force of attraction between them? [3 MARKS]

Classify the following as physical and chemical changes: (i) Cleaning with soap and water (ii) Cooking chicken (iii) Formation of clouds (iv) Making ice candy

Which of the following is a property of Hydrogen?

The atom that accepts electrons is said to have a __ valency.

A radioactive nucleus A with a half life T, decays into a nucleus B. At t=0, there is no nucleus B. At sometime t, the ratio of the number of B to that of A is 0.3. Then, t is given by

What is difference between gas and plasma?

If the wave number of 1st line of Balmer series of hydrogen atom is ‘x’ then the wave number of 1st line of Lyman series of He+ ion will be

{ Q }10/15 10 L of gaseous mixture at STP contains }}{NH_3 and }NO_2 gas is 2:3 by volume. Ratio of their }} Nitrogen atoms will be

Oxidation state of oxygen in Tribromo Octaoxide (Br3O8) isOptions:16/3–2+2-16/3

What are the physical states of dispersed phase and dispersion medium of a jelly, cheese and butter?

Q. In presence of a strong oxidising agent As2S3 is oxidised to arsinate and sulphate. What is the n-factor of As2S3.(1) 4 (2) 18(3) 28 (4) 24

0.8 mole of a mixture of O_{2 }and CO_2 requires exactly 40 gram of NaOH in solution for complete conversion of all the CO_2 into Na_2CO_3 , if the mixture (0.8 mole) is completely oxidised to CO_2 ? (a) 0.2 (b) 0.6 (c) 1 (d) 1.5

Which of the following curve assures that the metal obtained by carbon reduction is in the vapour state?

Name the gas which produces anode rays consisting of protons in the discharge tube experiment.

What is the maximum number of electrons an M shell of the atom can accomodate?

Why we cannot separates azeotrophs from fractional distillation

The smallest building block of any substance is ______

Name an isotope of an element which is used as reference for atomic mass unit.

Elements A, B and C have atomic numbers 17, 19 and 10 respectively. State which one is: i) A non-metal ii) A metal iii) Chemically inert.

mole fraction of gas in water is 0.001at stp determine henrys law cons†an t

The electronic configuration of an element is 1s^{2 }2s^2 2p^63s^2 3p^{3 }. what is the atomic number of thevelement ,which is just below the above element in the periodic table

Calculate the concentration in terms of mass by volume percentage of the solution containing, 3 g of potassium chloride in 75 ml of potassium chloride (KCl) solution.

The element which exists as a liquid upto 2000∘C & can be used in high temperature thermometry is