10223 + Interview Questions in Chemistry

1.	Calculate the no. of electrons in 100 gms of CO2
Answer» Calculate the no. of electrons in 100 gms of CO2

Discussion

2.	If a person is blindfolded and handed two objects, how can that person find out if the objects are solid or liquid?
Answer» If a person is blindfolded and handed two objects, how can that person find out if the objects are solid or liquid?

Discussion

3.	The number of molecules present in 200 g of baking soda is:
Answer» The number of molecules present in 200 g of baking soda is:

Discussion

4.	In which process is iron used as a catalyst?
Answer» In which process is iron used as a catalyst?

Discussion

5.	Give the evidence for the existance of nucleus in an atom.
Answer» Give the evidence for the existance of nucleus in an atom.

Discussion

6.	A noble metal is one which is inert and does not react with acids like HCl,HNO3,H2SO4. Select an option with a set of two noble metals.
Answer» A noble metal is one which is inert and does not react with acids like $H C l, H N O_{3}, H_{2} S O_{4}$ . Select an option with a set of two noble metals.

Discussion

7.	Question 3A mixture of sulphur and carbon disulphide is(a) heterogeneous and shows Tyndall effect(b) homogeneous and shows Tyndall effect(c) heterogeneous and does not show Tyndall effect(d) homogeneous and does not show Tyndall effect
Answer» Question 3 A mixture of sulphur and carbon disulphide is (a) heterogeneous and shows Tyndall effect (b) homogeneous and shows Tyndall effect (c) heterogeneous and does not show Tyndall effect (d) homogeneous and does not show Tyndall effect

Discussion

8.	Consider the electronic energy level diagram of H-atom. Photons associated with shortest and longest wavelengths would be emitted from the atom by the transitions labeled
Answer» Consider the electronic energy level diagram of H-atom. Photons associated with shortest and longest wavelengths would be emitted from the atom by the transitions labeled

8.

Consider the electronic energy level diagram of H-atom. Photons associated with shortest and longest wavelengths would be emitted from the atom by the transitions labeled

Answer»

Consider the electronic energy level diagram of H-atom. Photons associated with shortest and longest wavelengths would be emitted from the atom by the transitions labeled

Discussion

9.	Which of the following has the strongest intermolecular force of attraction between its particles at room temperature?
Answer» Which of the following has the strongest intermolecular force of attraction between its particles at room temperature?

Discussion

10.	Which of the following mixtures can be separated into its constituents using centrifugation?
Answer» Which of the following mixtures can be separated into its constituents using centrifugation?

Discussion

11.	There is one term known as Christmas factor ( clotting blood name), so there are also different names for all clothing blood??
Answer» There is one term known as Christmas factor ( clotting blood name), so there are also different names for all clothing blood??

Discussion

12.	Which of the following diffuses fastest and which the slowest ? Solid. Liquid, Gas
Answer» Which of the following diffuses fastest and which the slowest ? Solid. Liquid, Gas

12.

Which of the following diffuses fastest and which the slowest ? Solid. Liquid, Gas

Answer»

Which of the following diffuses fastest and which the slowest ?

Solid. Liquid, Gas

Discussion

13.	maximum number of electrons in a subshell with l=3 and n=4
Answer» maximum number of electrons in a subshell with l=3 and n=4

Discussion

14.	A particle moves from a to b in a circular path of radius r covering an angle theta as shown in figure. Find the ratio of distance and mag
Answer» A particle moves from a to b in a circular path of radius r covering an angle theta as shown in figure. Find the ratio of distance and mag

Discussion

15.	If an atom is sharing its 8 valence electrons with another atom, then:
Answer» If an atom is sharing its 8 valence electrons with another atom, then:

Discussion

16.	Describe the major air pollutants. How does carbon monoxide pollute our environment ?
Answer» Describe the major air pollutants. How does carbon monoxide pollute our environment ?

Discussion

17.	do isolated and neutral mean the same for an atom and if not, then what is the difference?
Answer» do isolated and neutral mean the same for an atom and if not, then what is the difference?

Discussion

18.	What produces more severe burns, boiling water or steam? Now explain in which physical state out of the two will the particles have more energy? [3 MARKS]
Answer» What produces more severe burns, boiling water or steam? Now explain in which physical state out of the two will the particles have more energy? [3 MARKS]

Discussion

19.	Which of the following is not a matter?
Answer» Which of the following is not a matter?

Discussion

20.	The boiling point of 1 M aqueous solution of KNO3 (Kb = 0.52 K molal)–1 is
Answer» The boiling point of 1 M aqueous solution of KNO3 (Kb = 0.52 K molal)–1 is

Discussion

21.	Elements having valency 'one' are: (a) always metals (b) always non-metals (c) always metalloids (d) either metals or non-metals
Answer» Elements having valency 'one' are: (a) always metals (b) always non-metals (c) always metalloids (d) either metals or non-metals

21.

Elements having valency 'one' are: (a) always metals (b) always non-metals (c) always metalloids (d) either metals or non-metals

Answer»

Elements having valency 'one' are:

(a) always metals

(b) always non-metals

(c) always metalloids

(d) either metals or non-metals

Discussion

22.	At a constant temperature a gas is initially at 2 atm pressure. To compress it to(18)th of its initial volume, pressure to be applied is ___
Answer» At a constant temperature a gas is initially at 2 atm pressure. To compress it to ${(\frac{1}{8})}^{t h}$ of its initial volume, pressure to be applied is ___

Discussion

23.	When 10 mL of an aqueous solution of Fe2+ ions was titrated in the presence of dil H2SO4 using diphenylamine indicator, 15 mLof 0.02 M solution of K2Cr2O7 was required to get the end point. The molarity of the solution containing Fe2+ ions is x×10−2M. The value of x is ___. (Nearest integer)
Answer» When $10 m L$ of an aqueous solution of $F e^{2 +}$ ions was titrated in the presence of dil $H_{2} S O_{4}$ using diphenylamine indicator, $15 m L of$ $0.02 M$ solution of $K_{2} C r_{2} O_{7}$ was required to get the end point. The molarity of the solution containing $F e^{2 +}$ ions is $x \times 10^{- 2} M$ . The value of $x$ is ___. (Nearest integer)

Discussion

24.	Packing fraction of hexagonal close packing in 2D
Answer» Packing fraction of hexagonal close packing in 2D

Discussion

25.	Calculate the vapour density for PCl5.
Answer» Calculate the vapour density for $P C l_{5}$ .

Discussion

26.	3.Positronium consists of electron and positron which have same mass,calculate the Rydbergs constant for this system given that it is RH for hydrogen atom
Answer» 3.Positronium consists of electron and positron which have same mass,calculate the Rydbergs constant for this system given that it is RH for hydrogen atom

Discussion

27.	Question 4 (c) Write the chemical formulae of the following: (c) Copper nitrate
Answer» Question 4 (c) Write the chemical formulae of the following: (c) Copper nitrate

Discussion

28.	The compressibility of a gas is less than unity at STP. Therefore, (1) V>22.4L (2) V
Answer» The compressibility of a gas is less than unity at STP. Therefore, (1) V>22.4L (2) V<22.4L (3) V=22.4L (4) V=44.8L

Discussion

29.	If in Bohr’s atomic model, it is assumed that force between electron and proton varies inversely as r ^4 , energy of the system will be proportional to (1) n^2 (2) n^4 (3) n^6 (4) n^{8
Answer» If in Bohr’s atomic model, it is assumed that force between electron and proton varies inversely as r ^4 , energy of the system will be proportional to (1) n^2 (2) n^4 (3) n^6 (4) n^{8

Discussion

30.	Do all polyatomic ions include only 2 elements
Answer» Do all polyatomic ions include only 2 elements

Discussion

31.	The atomic mass of an element is usually fractional because:
Answer» The atomic mass of an element is usually fractional because:

31.

The atomic mass of an element is usually fractional because:

Answer»

The atomic mass of an element is usually fractional because:

Discussion

32.	Hydrogen and Helium belong to which block of the periodic table and why?
Answer» Hydrogen and Helium belong to which block of the periodic table and why?

Discussion

33.	Decomposition brought about by heat is known as thermal decomposition. What is the difference between thermal dissociation and thermal decomposition?
Answer» Decomposition brought about by heat is known as thermal decomposition. What is the difference between thermal dissociation and thermal decomposition?

Discussion

34.	oil and fats containing food items are flushed with nitrogen. why?
Answer» oil and fats containing food items are flushed with nitrogen. why?

Discussion

35.	Write the Bohr Bury scheme to fill the electrons in various energy levels of an atom.Using these rules,write the electron arrangement of the elements having atomic numbers 6, 11, 15 and 18.
Answer» Write the Bohr Bury scheme to fill the electrons in various energy levels of an atom.Using these rules,write the electron arrangement of the elements having atomic numbers 6, 11, 15 and 18.

Discussion

36.	A compound of magnesium contains 21.9% magnesium, 27.8% phosphorous and 50.3% oxygen.What will be the simplest formula of the compound ?
Answer» A compound of magnesium contains 21.9% magnesium, 27.8% phosphorous and 50.3% oxygen.What will be the simplest formula of the compound ?

Discussion

37.	Which of the following is the correct order of dipole moment ? (1) XeF2 > XeO3F2 (2) BF3 > BCl3 (3) PCl3F2 < PF3Cl2 (4) NH3 < NF3
Answer» Which of the following is the correct order of dipole moment ? (1) XeF2 > XeO3F2 (2) BF3 > BCl3 (3) PCl3F2 < PF3Cl2 (4) NH3 < NF3

Discussion

38.	The oxidation state of chromium in the final product formed by the reaction between KI and acidified potassium dichromate solution is:
Answer» The oxidation state of chromium in the final product formed by the reaction between $K I$ and acidified potassium dichromate solution is:

Discussion

39.	During β decay of stationary nucleus, anelectron is observed with a KE of 1.0 MeV. From this what can be concludedabout Q value of the decay?
Answer» During β decay of stationary nucleus, an electron is observed with a KE of 1.0 MeV. From this what can be concluded about Q value of the decay?

Discussion

40.	How the proportion is same in law of reciprocal propotions?
Answer» How the proportion is same in law of reciprocal propotions?

Discussion

41.	Explain about biomacromolecules and micromolecules
Answer» Explain about biomacromolecules and micromolecules

Discussion

42.	“Hydrogen occupies a unique position in Modern Periodic Table”. Justify the statement.
Answer» “Hydrogen occupies a unique position in Modern Periodic Table”. Justify the statement.

Discussion

43.	Heating of a sugar is a _______ change
Answer» Heating of a sugar is a _______ change

Discussion

44.	30 Whether Isotopes and isobars concepts are given on the basis of atomic mass or on the basis of mass number ?? Kindly make it clear with differentiating the mass number and atomic mass.
Answer» 30 Whether Isotopes and isobars concepts are given on the basis of atomic mass or on the basis of mass number ?? Kindly make it clear with differentiating the mass number and atomic mass.

Discussion

45.	66 Enthalpies of formation of co(g),CO2(g),N2O(g)and N2O4(g) are -110, -398, 81, 97 KJ/lol respectively. Find value of H for the reaction. N2O4(g) +3CO(g) ---->N20(g)+3CO2(g)
Answer» 66 Enthalpies of formation of co(g),CO2(g),N2O(g)and N2O4(g) are -110, -398, 81, 97 KJ/lol respectively. Find value of H for the reaction. N2O4(g) +3CO(g) ---->N20(g)+3CO2(g)

Discussion

46.	What happen if ice is kept in vacuum?
Answer» What happen if ice is kept in vacuum?

Discussion

47.	Find the vale of x^3+7x^2+16x+7 at x= 1/root of 9+4 root 5
Answer» Find the vale of x^3+7x^2+16x+7 at x= 1/root of 9+4 root 5

Discussion

48.	Good afternoon My name is VANDITA YADAV and I am student of BYJUS 9th grade. Good afternoon My name is VANDITA YADAV and I am student of BYJUS 9th grade. My doubt is related with chemistry : Do we have to learn the periodic table or just need to understand it.
Answer» Good afternoon My name is VANDITA YADAV and I am student of BYJUS 9th grade. Good afternoon My name is VANDITA YADAV and I am student of BYJUS 9th grade. My doubt is related with chemistry : Do we have to learn the periodic table or just need to understand it.

48.

Good afternoon My name is VANDITA YADAV and I am student of BYJUS 9th grade. Good afternoon My name is VANDITA YADAV and I am student of BYJUS 9th grade. My doubt is related with chemistry : Do we have to learn the periodic table or just need to understand it.

Answer»

Good afternoon

My name is VANDITA YADAV and I am student of BYJUS 9th grade.

Good afternoon

My name is VANDITA YADAV and I am student of BYJUS 9th grade.

My doubt is related with chemistry : Do we have to learn the periodic table or just need to understand it.

Discussion

49.	Which of the following liberates O2 upon hydrolysis?
Answer» Which of the following liberates $O_{2}$ upon hydrolysis?

Discussion

50.	The correct order of metallic characters for the given elements is B,Na,Al,K:
Answer» The correct order of metallic characters for the given elements is $B, N a, A l, K$ :

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Calculate the no. of electrons in 100 gms of CO2

If a person is blindfolded and handed two objects, how can that person find out if the objects are solid or liquid?

The number of molecules present in 200 g of baking soda is:

In which process is iron used as a catalyst?

Give the evidence for the existance of nucleus in an atom.

A noble metal is one which is inert and does not react with acids like HCl,HNO3,H2SO4. Select an option with a set of two noble metals.

Question 3A mixture of sulphur and carbon disulphide is(a) heterogeneous and shows Tyndall effect(b) homogeneous and shows Tyndall effect(c) heterogeneous and does not show Tyndall effect(d) homogeneous and does not show Tyndall effect

Consider the electronic energy level diagram of H-atom. Photons associated with shortest and longest wavelengths would be emitted from the atom by the transitions labeled

Which of the following has the strongest intermolecular force of attraction between its particles at room temperature?

Which of the following mixtures can be separated into its constituents using centrifugation?

There is one term known as Christmas factor ( clotting blood name), so there are also different names for all clothing blood??

Which of the following diffuses fastest and which the slowest ? Solid. Liquid, Gas

maximum number of electrons in a subshell with l=3 and n=4

A particle moves from a to b in a circular path of radius r covering an angle theta as shown in figure. Find the ratio of distance and mag

If an atom is sharing its 8 valence electrons with another atom, then:

Describe the major air pollutants. How does carbon monoxide pollute our environment ?

do isolated and neutral mean the same for an atom and if not, then what is the difference?

What produces more severe burns, boiling water or steam? Now explain in which physical state out of the two will the particles have more energy? [3 MARKS]

Which of the following is not a matter?

The boiling point of 1 M aqueous solution of KNO3 (Kb = 0.52 K molal)–1 is

Elements having valency 'one' are: (a) always metals (b) always non-metals (c) always metalloids (d) either metals or non-metals

At a constant temperature a gas is initially at 2 atm pressure. To compress it to(18)th of its initial volume, pressure to be applied is ___

When 10 mL of an aqueous solution of Fe2+ ions was titrated in the presence of dil H2SO4 using diphenylamine indicator, 15 mLof 0.02 M solution of K2Cr2O7 was required to get the end point. The molarity of the solution containing Fe2+ ions is x×10−2M. The value of x is ___. (Nearest integer)

Packing fraction of hexagonal close packing in 2D

Calculate the vapour density for PCl5.

3.Positronium consists of electron and positron which have same mass,calculate the Rydbergs constant for this system given that it is RH for hydrogen atom

Question 4 (c) Write the chemical formulae of the following: (c) Copper nitrate

The compressibility of a gas is less than unity at STP. Therefore, (1) V>22.4L (2) V

If in Bohr’s atomic model, it is assumed that force between electron and proton varies inversely as r ^4 , energy of the system will be proportional to (1) n^2 (2) n^4 (3) n^6 (4) n^{8

Do all polyatomic ions include only 2 elements

The atomic mass of an element is usually fractional because:

Hydrogen and Helium belong to which block of the periodic table and why?

Decomposition brought about by heat is known as thermal decomposition. What is the difference between thermal dissociation and thermal decomposition?

oil and fats containing food items are flushed with nitrogen. why?

Write the Bohr Bury scheme to fill the electrons in various energy levels of an atom.Using these rules,write the electron arrangement of the elements having atomic numbers 6, 11, 15 and 18.

A compound of magnesium contains 21.9% magnesium, 27.8% phosphorous and 50.3% oxygen.What will be the simplest formula of the compound ?

Which of the following is the correct order of dipole moment ? (1) XeF2 > XeO3F2 (2) BF3 > BCl3 (3) PCl3F2 < PF3Cl2 (4) NH3 < NF3

The oxidation state of chromium in the final product formed by the reaction between KI and acidified potassium dichromate solution is:

During β decay of stationary nucleus, anelectron is observed with a KE of 1.0 MeV. From this what can be concludedabout Q value of the decay?

How the proportion is same in law of reciprocal propotions?

Explain about biomacromolecules and micromolecules

“Hydrogen occupies a unique position in Modern Periodic Table”. Justify the statement.

Heating of a sugar is a _______ change

30 Whether Isotopes and isobars concepts are given on the basis of atomic mass or on the basis of mass number ?? Kindly make it clear with differentiating the mass number and atomic mass.

66 Enthalpies of formation of co(g),CO2(g),N2O(g)and N2O4(g) are -110, -398, 81, 97 KJ/lol respectively. Find value of H for the reaction. N2O4(g) +3CO(g) ---->N20(g)+3CO2(g)

What happen if ice is kept in vacuum?

Find the vale of x^3+7x^2+16x+7 at x= 1/root of 9+4 root 5

Good afternoon My name is VANDITA YADAV and I am student of BYJUS 9th grade. Good afternoon My name is VANDITA YADAV and I am student of BYJUS 9th grade. My doubt is related with chemistry : Do we have to learn the periodic table or just need to understand it.

Which of the following liberates O2 upon hydrolysis?

The correct order of metallic characters for the given elements is B,Na,Al,K: