7248 + Interview Questions in Chemistry Page 55 InterviewSolution

2701.	What are the various steps for processing fibres into wool?
Answer» What are the various steps for processing fibres into wool?

Discussion

2702.	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.

2702.

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

2703.	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

2704.	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

2705.	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

2706.	What is difference between formal charges and oxidation state
Answer» What is difference between formal charges and oxidation state

Discussion

2707.	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

2708.	Metals are good conductors of heat and___.
Answer» Metals are good conductors of heat and___.

Discussion

2709.	34. N_3H structure and bond angle bond length
Answer» 34. N_3H structure and bond angle bond length

Discussion

2710.	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

2711.	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 ___

2711.

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

2712.	Which among the following does not undergo sublimation?
Answer» Which among the following does not undergo sublimation?

Discussion

2713.	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

2714.	.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

2715.	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

2716.	(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

2717.	The first step in bakelite formation is
Answer» The first step in bakelite formation is

Discussion

2718.	Identify the general representation of a combination reaction.
Answer» Identify the general representation of a combination reaction.

Discussion

2719.	Write a brief note on the heterogeneous mixture.
Answer» Write a brief note on the heterogeneous mixture.

Discussion

2720.	Which one of the following is a chemical change?
Answer» Which one of the following is a chemical change?

Discussion

2721.	What happens when hydrogen reacts with metal oxides?
Answer» What happens when hydrogen reacts with metal oxides?

Discussion

2722.	What are quarks and hadrons inside an atom
Answer» What are quarks and hadrons inside an atom

Discussion

2723.	Explain petrochemicals
Answer» Explain petrochemicals

Discussion

2724.	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

2725.	What is ionic radius
Answer» What is ionic radius

Discussion

2726.	Rayon is also known as ______.
Answer» Rayon is also known as ______.

Discussion

2727.	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

2728.	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 ?

2728.

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

2729.	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

2730.	Which of the following physical property is not shown by metals?
Answer» Which of the following physical property is not shown by metals?

Discussion

2731.	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

2732.	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

2733.	Concept of peroxybond .
Answer» Concept of peroxybond .

Discussion

2734.	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

2735.	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

2736.	Question 4Compare LPG and wood as fuels.
Answer» Question 4 Compare LPG and wood as fuels.

Discussion

2737.	What will be the pH value of the strongest base?14
Answer» What will be the pH value of the strongest base? 14

Discussion

2738.	Which property of sand is used in extinguishing fires?
Answer» Which property of sand is used in extinguishing fires?

Discussion

2739.	(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

2740.	Could we separate water and petrol quickly without heating?
Answer» Could we separate water and petrol quickly without heating?

Discussion

2741.	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

2741.

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

2742.	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

2743.	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

2744.	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

2745.	Which fibre is used to make parachute ? Why?
Answer» Which fibre is used to make parachute ? Why?

Discussion

2746.	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

2747.	Hydrogen is the characteristic constituent of :-
Answer» Hydrogen is the characteristic constituent of :-

Discussion

2748.	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

2749.	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

2750.	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 .

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.