7248 + Interview Questions in Chemistry

1.	What are the various steps for processing fibres into wool?
Answer» What are the various steps for processing fibres into wool?

Discussion

2.	Fill in the blanks and complete the story. About 300 million years ago the earth had dense in low lying wetland areas. b) Due to natural processes, like , these forests got buried under the . As more deposited over them, they were compressed. The also rose as they sank deeper and deeper. (e) Under high and high , dead plants got slowly converted into coal.
Answer» Fill in the blanks and complete the story. About 300 million years ago the earth had dense in low lying wetland areas. b) Due to natural processes, like , these forests got buried under the . As more deposited over them, they were compressed. The also rose as they sank deeper and deeper. (e) Under high and high , dead plants got slowly converted into coal.

2.

Fill in the blanks and complete the story. About 300 million years ago the earth had dense in low lying wetland areas. b) Due to natural processes, like , these forests got buried under the . As more deposited over them, they were compressed. The also rose as they sank deeper and deeper. (e) Under high and high , dead plants got slowly converted into coal.

Answer»

Fill in the blanks and complete the story.

About 300 million years ago the earth had dense in low lying wetland areas. b) Due to natural processes, like , these forests got buried under the . As more deposited over them, they were compressed. The also rose as they sank deeper and deeper. (e) Under high and high , dead plants got slowly converted into coal.

Discussion

3.	Rooms are fitted with ventilators to let hot air out. Choose the correct phenomenon.
Answer» Rooms are fitted with ventilators to let hot air out. Choose the correct phenomenon.

Discussion

4.	A first aid manual suggests that vinegar must be used to treat wasp sting and baking soda for bee stings. (a) What does this information tell you about the chemical nature of wasp stings? (b) If there was no baking soda in the house, what other household substance could you use to treat bee stings?
Answer» A first aid manual suggests that vinegar must be used to treat wasp sting and baking soda for bee stings. (a) What does this information tell you about the chemical nature of wasp stings? (b) If there was no baking soda in the house, what other household substance could you use to treat bee stings?

Discussion

5.	What is meant by the statement "All intermediate oxidation state disproportionate in both acids and alkali into -3 and +5 oxd state" ?
Answer» What is meant by the statement "All intermediate oxidation state disproportionate in both acids and alkali into -3 and +5 oxd state" ?

Discussion

6.	What is difference between formal charges and oxidation state
Answer» What is difference between formal charges and oxidation state

Discussion

7.	one litre hard water contains 12.00 mg Mg2+ Milli equivalents of washing soda required to remove its hardness.
Answer» one litre hard water contains 12.00 mg Mg2+ Milli equivalents of washing soda required to remove its hardness.

Discussion

8.	Metals are good conductors of heat and___.
Answer» Metals are good conductors of heat and___.

Discussion

9.	34. N_3H structure and bond angle bond length
Answer» 34. N_3H structure and bond angle bond length

Discussion

10.	We read in newspapers that burning of fuels is a major cause of global warming. Explain why.
Answer» We read in newspapers that burning of fuels is a major cause of global warming. Explain why.

Discussion

11.	According to Dalton, the element that has the following symbol for representation is ___
Answer» According to Dalton, the element that has the following symbol for representation is ___

11.

According to Dalton, the element that has the following symbol for representation is ___

Answer»

According to Dalton, the element that has the following symbol for representation is

___

Discussion

12.	Which among the following does not undergo sublimation?
Answer» Which among the following does not undergo sublimation?

Discussion

13.	arrange the bonds in order of increasing ionic character in the molecules lif k2o n2 so2 and clf3
Answer» arrange the bonds in order of increasing ionic character in the molecules lif k2o n2 so2 and clf3

Discussion

14.	.If an element A shows two cationic states +2 and+3 and form oxides in such a way that ratio of the element showing +2 and +3 state is 1:3 in acompound. Formula of the compound will be(1) A8O11(2) A4O11(3) A9O11(4) A5O11
Answer» .If an element A shows two cationic states +2 and+3 and form oxides in such a way that ratio of the element showing +2 and +3 state is 1:3 in acompound. Formula of the compound will be(1) A8O11(2) A4O11(3) A9O11(4) A5O11

Discussion

15.	Which of the following will show “Tyndall effect”?a. Salt solutionb. Milkc. Copper sulphate solutiond. Starch solution
Answer» Which of the following will show “Tyndall effect”? a. Salt solution b. Milk c. Copper sulphate solution d. Starch solution

Discussion

16.	(i) Explain why, steam at 100°C is better for heating purposes than boiling water at 100°C.(ii) Which produces more severe burns: boiling water or steam? Why?(iii) State one condition necessary to liquefy gases (other than applying high pressure.)
Answer» (i) Explain why, steam at 100 $°$ C is better for heating purposes than boiling water at 100 $°$ C. (ii) Which produces more severe burns: boiling water or steam? Why? (iii) State one condition necessary to liquefy gases (other than applying high pressure.)

Discussion

17.	The first step in bakelite formation is
Answer» The first step in bakelite formation is

Discussion

18.	Identify the general representation of a combination reaction.
Answer» Identify the general representation of a combination reaction.

Discussion

19.	Write a brief note on the heterogeneous mixture.
Answer» Write a brief note on the heterogeneous mixture.

Discussion

20.	Which one of the following is a chemical change?
Answer» Which one of the following is a chemical change?

Discussion

21.	What happens when hydrogen reacts with metal oxides?
Answer» What happens when hydrogen reacts with metal oxides?

Discussion

22.	What are quarks and hadrons inside an atom
Answer» What are quarks and hadrons inside an atom

Discussion

23.	Explain petrochemicals
Answer» Explain petrochemicals

Discussion

24.	Copper is less reactive than hydrogen. Then how does nitric acid reacts with copper
Answer» Copper is less reactive than hydrogen. Then how does nitric acid reacts with copper

Discussion

25.	What is ionic radius
Answer» What is ionic radius

Discussion

26.	Rayon is also known as ______.
Answer» Rayon is also known as ______.

Discussion

27.	What are allotropes? Sketch the structure of two allotropes of carbon namelydiamond and graphite. What is the impact of structure on physicalproperties of two allotropes?
Answer» What are allotropes? Sketch the structure of two allotropes of carbon namelydiamond and graphite. What is the impact of structure on physicalproperties of two allotropes?

Discussion

28.	Out of the following materials : Cotton, Nylon, Terylene, Wool, PET, Acrylic (a) Which materials are polyesters? (b) Which material is a polyamide ? (c) Which material is used as a substitute for wool ? (d) Which material is used as a substitue for glass ?
Answer» Out of the following materials : Cotton, Nylon, Terylene, Wool, PET, Acrylic (a) Which materials are polyesters? (b) Which material is a polyamide ? (c) Which material is used as a substitute for wool ? (d) Which material is used as a substitue for glass ?

28.

Out of the following materials : Cotton, Nylon, Terylene, Wool, PET, Acrylic (a) Which materials are polyesters? (b) Which material is a polyamide ? (c) Which material is used as a substitute for wool ? (d) Which material is used as a substitue for glass ?

Answer»

Out of the following materials :

Cotton, Nylon, Terylene, Wool, PET, Acrylic

(a) Which materials are polyesters?

(b) Which material is a polyamide ?

(c) Which material is used as a substitute for wool ?

(d) Which material is used as a substitue for glass ?

Discussion

29.	What is difference betwee common tap water and distilled wayer on pH scale?
Answer» What is difference betwee common tap water and distilled wayer on pH scale?

Discussion

30.	Which of the following physical property is not shown by metals?
Answer» Which of the following physical property is not shown by metals?

Discussion

31.	The strength of an acid depends on the number of ions and the strength of a base depends on the number of ions furnished when dissolved in water.
Answer» The strength of an acid depends on the number of ions and the strength of a base depends on the number of ions furnished when dissolved in water.

Discussion

32.	Choose the reaction which shows heating of metallic chloride with concentrated H2SO4.
Answer» Choose the reaction which shows heating of metallic chloride with concentrated H₂SO_4.

Discussion

33.	Concept of peroxybond .
Answer» Concept of peroxybond .

Discussion

34.	119. how many times does the electron go round the first bohr orbit in a second . explain in detail
Answer» 119. how many times does the electron go round the first bohr orbit in a second . explain in detail

Discussion

35.	How does potential energy increase with increase in height. What is the logic.
Answer» How does potential energy increase with increase in height. What is the logic.

Discussion

36.	Question 4Compare LPG and wood as fuels.
Answer» Question 4 Compare LPG and wood as fuels.

Discussion

37.	What will be the pH value of the strongest base?14
Answer» What will be the pH value of the strongest base? 14

Discussion

38.	Which property of sand is used in extinguishing fires?
Answer» Which property of sand is used in extinguishing fires?

Discussion

39.	(a) Explain the terms:(i) Solution(ii) Solute(iii) Solvent(b) Identify solute and solvent in the following solutions :(i) Aerated drinks(ii) Tincture of iodine(iii) Lemon water
Answer» (a) Explain the terms: (i) Solution (ii) Solute (iii) Solvent (b) Identify solute and solvent in the following solutions : (i) Aerated drinks (ii) Tincture of iodine (iii) Lemon water

Discussion

40.	Could we separate water and petrol quickly without heating?
Answer» Could we separate water and petrol quickly without heating?

Discussion

41.	Which of the following can be used as a method for secondary oil recovery?1) Water flooding2) Surfactants injection3) CO2 injection4) Microbial injection
Answer» Which of the following can be used as a method for secondary oil recovery? 1) Water flooding 2) Surfactants injection 3) $C O_{2}$ injection 4) Microbial injection

41.

Which of the following can be used as a method for secondary oil recovery?1) Water flooding2) Surfactants injection3) CO2 injection4) Microbial injection

Answer»

Which of the following can be used as a method for secondary oil recovery?

1) Water flooding

2) Surfactants injection

3) $C O_{2}$ injection

4) Microbial injection

Discussion

42.	ZnSO4(aq)+2NH4OH(aq)→AWhite ppt+BA is:
Answer» $Z n S O_{4} (a q) + 2 N H_{4} O H (a q) \to A White ppt + B$ $A$ is:

Discussion

43.	13. Two equal point charges A and B are R distanceapart. A third point charge placed on theperpendicular bisector at a distance d from thecentre will experience maximum electrostatic forcewhenFrat(2) d2/2(3) d-RV2(4) d-2/2PR14 A charged goldho loaf lo
Answer» 13. Two equal point charges A and B are R distanceapart. A third point charge placed on theperpendicular bisector at a distance d from thecentre will experience maximum electrostatic forcewhenFrat(2) d2/2(3) d-RV2(4) d-2/2PR14 A charged goldho loaf lo

Discussion

44.	The sulphide ores are converted into oxides by heating them strongly in the presence of excess air. This process is called
Answer» The sulphide ores are converted into oxides by heating them strongly in the presence of excess air. This process is called

Discussion

45.	Which fibre is used to make parachute ? Why?
Answer» Which fibre is used to make parachute ? Why?

Discussion

46.	When the iron nail is dipped in the copper sulphate solution, after sometime the iron nail becomes brownish in colour. This brown colour is formed due to the deposition of:
Answer» When the iron nail is dipped in the copper sulphate solution, after sometime the iron nail becomes brownish in colour. This brown colour is formed due to the deposition of:

Discussion

47.	Hydrogen is the characteristic constituent of :-
Answer» Hydrogen is the characteristic constituent of :-

Discussion

48.	What is the reason of the order of Melting point and boiling point in HF,H2O ,NH3
Answer» What is the reason of the order of Melting point and boiling point in HF,H2O ,NH3

Discussion

49.	Calculate the formula masses of the following compounds:(a) Sodium oxide, Na2O(b) Aluminium oxide, Al2O3(Given: Atomic Masses: Na = 23 u; O = 16 u; Al = 27 u)
Answer» Calculate the formula masses of the following compounds: (a) Sodium oxide, Na₂O (b) Aluminium oxide, Al₂O₃ (Given: Atomic Masses: Na = 23 u; O = 16 u; Al = 27 u)

Discussion

50.	Which plastic is used in making parts of refrigerators, gears of machines and toys?
Answer» Which plastic is used in making parts of refrigerators, gears of machines and toys?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

What are the various steps for processing fibres into wool?

Rooms are fitted with ventilators to let hot air out. Choose the correct phenomenon.

A first aid manual suggests that vinegar must be used to treat wasp sting and baking soda for bee stings. (a) What does this information tell you about the chemical nature of wasp stings? (b) If there was no baking soda in the house, what other household substance could you use to treat bee stings?

What is meant by the statement "All intermediate oxidation state disproportionate in both acids and alkali into -3 and +5 oxd state" ?

What is difference between formal charges and oxidation state

one litre hard water contains 12.00 mg Mg2+ Milli equivalents of washing soda required to remove its hardness.

Metals are good conductors of heat and___.

34. N_3H structure and bond angle bond length

We read in newspapers that burning of fuels is a major cause of global warming. Explain why.​

According to Dalton, the element that has the following symbol for representation is ___

Which among the following does not undergo sublimation?

arrange the bonds in order of increasing ionic character in the molecules lif k2o n2 so2 and clf3

.If an element A shows two cationic states +2 and+3 and form oxides in such a way that ratio of the element showing +2 and +3 state is 1:3 in acompound. Formula of the compound will be(1) A8O11(2) A4O11(3) A9O11(4) A5O11

Which of the following will show “Tyndall effect”?a. Salt solutionb. Milkc. Copper sulphate solutiond. Starch solution

(i) Explain why, steam at 100°C is better for heating purposes than boiling water at 100°C.(ii) Which produces more severe burns: boiling water or steam? Why?(iii) State one condition necessary to liquefy gases (other than applying high pressure.)

The first step in bakelite formation is

Identify the general representation of a combination reaction.

Write a brief note on the heterogeneous mixture.

Which one of the following is a chemical change?

What happens when hydrogen reacts with metal oxides?

What are quarks and hadrons inside an atom

Explain petrochemicals

Copper is less reactive than hydrogen. Then how does nitric acid reacts with copper

What is ionic radius

Rayon is also known as ______.

What are allotropes? Sketch the structure of two allotropes of carbon namelydiamond and graphite. What is the impact of structure on physicalproperties of two allotropes?

Out of the following materials : Cotton, Nylon, Terylene, Wool, PET, Acrylic (a) Which materials are polyesters? (b) Which material is a polyamide ? (c) Which material is used as a substitute for wool ? (d) Which material is used as a substitue for glass ?

What is difference betwee common tap water and distilled wayer on pH scale?

Which of the following physical property is not shown by metals?

The strength of an acid depends on the number of ions and the strength of a base depends on the number of ions furnished when dissolved in water.

Choose the reaction which shows heating of metallic chloride with concentrated H2SO4.

Concept of peroxybond .

119. how many times does the electron go round the first bohr orbit in a second . explain in detail

How does potential energy increase with increase in height. What is the logic.

Question 4Compare LPG and wood as fuels.

What will be the pH value of the strongest base?14

Which property of sand is used in extinguishing fires?

(a) Explain the terms:(i) Solution(ii) Solute(iii) Solvent(b) Identify solute and solvent in the following solutions :(i) Aerated drinks(ii) Tincture of iodine(iii) Lemon water

Could we separate water and petrol quickly without heating?

Which of the following can be used as a method for secondary oil recovery?1) Water flooding2) Surfactants injection3) CO2 injection4) Microbial injection

ZnSO4(aq)+2NH4OH(aq)→AWhite ppt+BA is:

13. Two equal point charges A and B are R distanceapart. A third point charge placed on theperpendicular bisector at a distance d from thecentre will experience maximum electrostatic forcewhenFrat(2) d2/2(3) d-RV2(4) d-2/2PR14 A charged goldho loaf lo

The sulphide ores are converted into oxides by heating them strongly in the presence of excess air. This process is called

Which fibre is used to make parachute ? Why?

When the iron nail is dipped in the copper sulphate solution, after sometime the iron nail becomes brownish in colour. This brown colour is formed due to the deposition of:

Hydrogen is the characteristic constituent of :-

What is the reason of the order of Melting point and boiling point in HF,H2O ,NH3

Calculate the formula masses of the following compounds:(a) Sodium oxide, Na2O(b) Aluminium oxide, Al2O3(Given: Atomic Masses: Na = 23 u; O = 16 u; Al = 27 u)

Which plastic is used in making parts of refrigerators, gears of machines and toys?

We read in newspapers that burning of fuels is a major cause of global warming. Explain why.