7248 + Interview Questions in Chemistry Page 87 InterviewSolution

4301.	Sir, It is said that matter is neither created nor destroyed. When the reproduction happens, doesn't a new matter being created? I am confused about this concept.
Answer» Sir, It is said that matter is neither created nor destroyed. When the reproduction happens, doesn't a new matter being created? I am confused about this concept.

4301.

Sir, It is said that matter is neither created nor destroyed. When the reproduction happens, doesn't a new matter being created? I am confused about this concept.

Answer»

Sir,

It is said that matter is neither created nor destroyed. When the reproduction happens, doesn't a new matter being created? I am confused about this concept.

Discussion

4302.	Question 23 Match items in List A with the items of list B. List AList B(a)Nylon(i) Non-stick coating(b) PET(ii) Electric switches(c) Rayon(iii) Parachutes(d) Thermosetting plastics(iv) Polyster(e) Teflon(v) Artificial silk
Answer» Question 23 Match items in List A with the items of list B. $\begin{matrix} List A & List B (a)Nylon & (i) Non-stick coating (b) PET & (ii) Electric switches (c) Rayon & (iii) Parachutes (d) Thermosetting plastics & (iv) Polyster (e) Teflon & (v) Artificial silk \end{matrix}$

Discussion

4303.	How is a mixture different from a compound?
Answer» How is a mixture different from a compound?

Discussion

4304.	Question 15The electron distribution of an aluminium atom is(a) 2, 8, 3(b) 2, 8, 2(c) 8, 2, 3(d) 2, 3, 8
Answer» Question 15 The electron distribution of an aluminium atom is (a) 2, 8, 3 (b) 2, 8, 2 (c) 8, 2, 3 (d) 2, 3, 8

Discussion

4305.	87. A substanc, on analysis, gave the following percentage composition :na=43.4percentage c=11.3percentage.calculate the empirical formula.(na=23,c=12,o=16)
Answer» 87. A substanc, on analysis, gave the following percentage composition :na=43.4percentage c=11.3percentage.calculate the empirical formula.(na=23,c=12,o=16)

Discussion

4306.	Water is considered as the universal solvent. Why?
Answer» Water is considered as the universal solvent. Why?

Discussion

4307.	What do you mean by corrosion? Name the factors that affect corrosion.
Answer» What do you mean by corrosion? Name the factors that affect corrosion.

Discussion

4308.	Question 3(iii) Samples of four metals A, B, C and D were taken and added to the following solution one by one. The results obtained have been tabulated as follows: MetalIron(II)sulphateCooper(II)sulphateZinc sulphateSilver nitrateA.No reactionDisplacementB.DisplacementNo reactionC.No reactionNo reactionNo reactionDisplacementD.No reactionNo reactionNo reactionNo reaction Use the Table above to answer the following questions about metals A, B, C and D. (iii) Arrange the metals A, B, C and D in the decreasing order of reactivity.
Answer» Question 3(iii) Samples of four metals A, B, C and D were taken and added to the following solution one by one. The results obtained have been tabulated as follows: $\begin{matrix} M e t a l & I r o n (I I) s u l p h a t e & C o o p e r (I I) s u l p h a t e & Z i n c s u l p h a t e & S i l v e r n i t r a t e A . & N o r e a c t i o n & D i s p l a c e m e n t B . & D i s p l a c e m e n t & N o r e a c t i o n C . & N o r e a c t i o n & N o r e a c t i o n & N o r e a c t i o n & D i s p l a c e m e n t D . & N o r e a c t i o n & N o r e a c t i o n & N o r e a c t i o n & N o r e a c t i o n \end{matrix}$ Use the Table above to answer the following questions about metals A, B, C and D. (iii) Arrange the metals A, B, C and D in the decreasing order of reactivity.

Discussion

4309.	Fabrics made from which of the following fibers doesn't wrinkle easily?
Answer» Fabrics made from which of the following fibers doesn't wrinkle easily?

Discussion

4310.	how does a candle burn? write the steps of changes involved
Answer» how does a candle burn? write the steps of changes involved

Discussion

4311.	Which among the following materials cannot be turned into wires?
Answer» Which among the following materials cannot be turned into wires?

Discussion

4312.	Why is dry ice more dangerous than the normal ice cubes?
Answer» Why is dry ice more dangerous than the normal ice cubes?

Discussion

4313.	Question 4Dalton's atomic theory successfully explained.(i) law of conservation of mass(ii) law of constant composition(iii) law of radioactivity(iv) law of multiple proportions(a) (i), (ii) and (iii)(b) (i), (iii) and (iv)(c) (ii), (iii) and (iv)(d) (i), (ii) and (iv)
Answer» Question 4 Dalton's atomic theory successfully explained. (i) law of conservation of mass (ii) law of constant composition (iii) law of radioactivity (iv) law of multiple proportions (a) (i), (ii) and (iii) (b) (i), (iii) and (iv) (c) (ii), (iii) and (iv) (d) (i), (ii) and (iv)

Discussion

4314.	In case of a fire, before the firemen use the water, they shut off the main electrical supply for the area. Explain the reason behind this.
Answer» In case of a fire, before the firemen use the water, they shut off the main electrical supply for the area. Explain the reason behind this.

Discussion

4315.	WHAT IS THE DERIVATION OF THE FORMULA OF APPARENT DEPTH AND APPARENT HEIGHT?
Answer» WHAT IS THE DERIVATION OF THE FORMULA OF APPARENT DEPTH AND APPARENT HEIGHT?

Discussion

4316.	How many molecules and atoms are present in 5O2?
Answer» How many molecules and atoms are present in $5 O_{2}$ ?

Discussion

4317.	The process of passing an electric current through a liquid is known as ___________.
Answer» The process of passing an electric current through a liquid is known as ___________.

Discussion

4318.	What is projectile in term of nuclear energy
Answer» What is projectile in term of nuclear energy

Discussion

4319.	8. 12.78g of organic compound containing c,h,o undergoes combustion to form 25.56g co2 and 10.46g of water.find the emperical formula of the compound
Answer» 8. 12.78g of organic compound containing c,h,o undergoes combustion to form 25.56g co2 and 10.46g of water.find the emperical formula of the compound

Discussion

4320.	Question 7 Explain the process of formation of petroleum. Name any three constituents of petroleum.
Answer» Question 7 Explain the process of formation of petroleum. Name any three constituents of petroleum.

4320.

Question 7 Explain the process of formation of petroleum. Name any three constituents of petroleum.

Answer»

Question 7

Explain the process of formation of petroleum.

Name any three constituents of petroleum.

Discussion

4321.	Anion A form hexagonal close packing and cation B occupy only 2/3 of octahedral voids in it, the general formula of compound is
Answer» Anion A form hexagonal close packing and cation B occupy only 2/3 of octahedral voids in it, the general formula of compound is

Discussion

4322.	Which metals are extracted by Carbon based smelting?
Answer» Which metals are extracted by Carbon based smelting?

Discussion

4323.	Question 4Which of the following are exothermic processes?(i) Reaction of water with quicklime(ii) Dilution of an acid(iii) Evaporation of water(iv) Sublimation of camphor (crystals)(a) (i) and (ii)(b) (ii) and (iii)(c) (i) and (iv)(d) (iii) and (iv)
Answer» Question 4 Which of the following are exothermic processes? (i) Reaction of water with quicklime (ii) Dilution of an acid (iii) Evaporation of water (iv) Sublimation of camphor (crystals) (a) (i) and (ii) (b) (ii) and (iii) (c) (i) and (iv) (d) (iii) and (iv)

4323.

Question 4Which of the following are exothermic processes?(i) Reaction of water with quicklime(ii) Dilution of an acid(iii) Evaporation of water(iv) Sublimation of camphor (crystals)(a) (i) and (ii)(b) (ii) and (iii)(c) (i) and (iv)(d) (iii) and (iv)

Answer»

Question 4

Which of the following are exothermic processes?

(i) Reaction of water with quicklime

(ii) Dilution of an acid

(iii) Evaporation of water

(iv) Sublimation of camphor (crystals)

(a) (i) and (ii)

(b) (ii) and (iii)

(c) (i) and (iv)

(d) (iii) and (iv)

Discussion

4324.	State the effects of green house gases on the atmosphere.
Answer» State the effects of green house gases on the atmosphere.

Discussion

4325.	Do plastics react with the acids like sulphuric acid ? And if they do so, then can we characterise them as non corrosive?
Answer» Do plastics react with the acids like sulphuric acid ? And if they do so, then can we characterise them as non corrosive?

Discussion

4326.	At what temperature R.M.S. velocity of oxygen will be half as that of methane at 27^° C
Answer» At what temperature R.M.S. velocity of oxygen will be half as that of methane at 27^° C

Discussion

4327.	if oil is being poured in water they don't mix but when detergent is added to it the water and oil get mixed why?
Answer» if oil is being poured in water they don't mix but when detergent is added to it the water and oil get mixed why?

Discussion

4328.	why intrinsic semiconductors are heat sensitive?
Answer» why intrinsic semiconductors are heat sensitive?

Discussion

4329.	Structure of a mixed oxide is Cubic close packed The Cubic unit cell of mixed oxide is composed of oxide ions one fourth of the tetrahedral voids are occupied by divalent metal A and octahedral voids are occupied by monovalent metal B the formula of the oxide is
Answer» Structure of a mixed oxide is Cubic close packed The Cubic unit cell of mixed oxide is composed of oxide ions one fourth of the tetrahedral voids are occupied by divalent metal A and octahedral voids are occupied by monovalent metal B the formula of the oxide is

Discussion

4330.	What is valency . what is the formula
Answer» What is valency . what is the formula

Discussion

4331.	Question 2:Why aluminium is used for wrapping food items?
Answer» Question 2: Why aluminium is used for wrapping food items?

4331.

Question 2:Why aluminium is used for wrapping food items?

Answer»

Question 2:

Why aluminium is used for wrapping food items?

Discussion

4332.	Question 31Read the paragraph and answer the questions following it. Water is essential for life. Without water, there would be no life. We usually take water as granted for its purity, but we must ensure the quality of water. Pollution of water originates from human activities. Through different paths, pollution reaches to groundwater. Easily identified source or place of pollution is called as point source, e.g.– municipal and industrial discharge pipes, where pollutants enter the water source. Non–point sources of pollution are those where a source of pollution cannot be easily identified, e.g.– agricultural run off, acid rain etc.(i) How do you classify the various sources of water pollution?(ii) What are the point sources of water pollution?(iii) Name any two non-point sources of water pollution?
Answer» Question 31 Read the paragraph and answer the questions following it. Water is essential for life. Without water, there would be no life. We usually take water as granted for its purity, but we must ensure the quality of water. Pollution of water originates from human activities. Through different paths, pollution reaches to groundwater. Easily identified source or place of pollution is called as point source, e.g.– municipal and industrial discharge pipes, where pollutants enter the water source. Non–point sources of pollution are those where a source of pollution cannot be easily identified, e.g.– agricultural run off, acid rain etc. (i) How do you classify the various sources of water pollution? (ii) What are the point sources of water pollution? (iii) Name any two non-point sources of water pollution?

Discussion

4333.	Which of the following is/are ambident nucleophiles?
Answer» Which of the following is/are ambident nucleophiles?

Discussion

4334.	Question 7Name two metals which will displace hydrogen from dilute acids and two metals which will not.
Answer» Question 7 Name two metals which will displace hydrogen from dilute acids and two metals which will not.

Discussion

4335.	Question 15 Name two major non-metals which are present in fertilizers and enhance the growth of plants.
Answer» Question 15 Name two major non-metals which are present in fertilizers and enhance the growth of plants.

Discussion

4336.	why carbon is hard
Answer» why carbon is hard

Discussion

4337.	(a) What is chemical equation ? (b) Why it is necessary to balance a chemical equation ? (c) What are the limitation of a chemical equation ?
Answer» (a) What is chemical equation ? (b) Why it is necessary to balance a chemical equation ? (c) What are the limitation of a chemical equation ?

4337.

(a) What is chemical equation ? (b) Why it is necessary to balance a chemical equation ? (c) What are the limitation of a chemical equation ?

Answer»

(a) What is chemical equation ?

(b) Why it is necessary to balance a chemical equation ?

(c) What are the limitation of a chemical equation ?

Discussion

4338.	Combustion of fossil fuels generates a lot of air pollution. Can you suggest any two alternative sources of energy which do not cause any pollution?
Answer» Combustion of fossil fuels generates a lot of air pollution. Can you suggest any two alternative sources of energy which do not cause any pollution?

Discussion

4339.	Are all precipitations reactions double displacement reactions?
Answer» Are all precipitations reactions double displacement reactions?

Discussion

4340.	14. 0.2 g of sample of H202 required 10 ml of1N KMNO solution in a titration in presence of dil.H2SO4. The percentage purity of H202 is(1) 25%(2) 65%(3) 85%(4) 95%
Answer» 14. 0.2 g of sample of H202 required 10 ml of1N KMNO solution in a titration in presence of dil.H2SO4. The percentage purity of H202 is(1) 25%(2) 65%(3) 85%(4) 95%

Discussion

4341.	The energy required to break one bond in DNA is 10−20. This value in eV is nearly:
Answer» The energy required to break one bond in DNA is $10^{- 20}$ . This value in $eV$ is nearly:

Discussion

4342.	What is the observation that can be made when calcium reacts with water?
Answer» What is the observation that can be made when calcium reacts with water?

Discussion

4343.	Which of the following formulae is/are correct?
Answer» Which of the following formulae is/are correct?

Discussion

4344.	what are mint crystals?
Answer» what are mint crystals?

Discussion

4345.	Production of synthetic fibre helps in the conversation of forest. Explain.
Answer» Production of synthetic fibre helps in the conversation of forest. Explain.

Discussion

4346.	Properties of hydrogen resembles from elements of following groups:
Answer» Properties of hydrogen resembles from elements of following groups:

Discussion

4347.	Why the outermost zone of flame is not visible?
Answer» Why the outermost zone of flame is not visible?

Discussion

4348.	Arrange the following fibres in the order of increasing strength (keeping the fibre of least strength first) : Nylon, Cotton , Wool, Polyester, Silk
Answer» Arrange the following fibres in the order of increasing strength (keeping the fibre of least strength first) : Nylon, Cotton , Wool, Polyester, Silk

4348.

Arrange the following fibres in the order of increasing strength (keeping the fibre of least strength first) : Nylon, Cotton , Wool, Polyester, Silk

Answer»

Arrange the following fibres in the order of increasing strength (keeping the fibre of least strength first) :

Nylon, Cotton , Wool, Polyester, Silk

Discussion

4349.	What state or phase of material are crystals?
Answer» What state or phase of material are crystals?

Discussion

4350.	The molecular formula of magnesium chloride is:
Answer» The molecular formula of magnesium chloride is:

Discussion

Explore topic-wise InterviewSolutions in .

Sir, It is said that matter is neither created nor destroyed. When the reproduction happens, doesn't a new matter being created? I am confused about this concept.

Question 23 Match items in List A with the items of list B. List AList B(a)Nylon(i) Non-stick coating(b) PET(ii) Electric switches(c) Rayon(iii) Parachutes(d) Thermosetting plastics(iv) Polyster(e) Teflon(v) Artificial silk

How is a mixture different from a compound?

Question 15The electron distribution of an aluminium atom is(a) 2, 8, 3(b) 2, 8, 2(c) 8, 2, 3(d) 2, 3, 8

87. A substanc, on analysis, gave the following percentage composition :na=43.4percentage c=11.3percentage.calculate the empirical formula.(na=23,c=12,o=16)

Water is considered as the universal solvent. Why?

What do you mean by corrosion? Name the factors that affect corrosion.

Fabrics made from which of the following fibers doesn't wrinkle easily?

how does a candle burn? write the steps of changes involved

Which among the following materials cannot be turned into wires?

Why is dry ice more dangerous than the normal ice cubes?

Question 4Dalton's atomic theory successfully explained.(i) law of conservation of mass(ii) law of constant composition(iii) law of radioactivity(iv) law of multiple proportions(a) (i), (ii) and (iii)(b) (i), (iii) and (iv)(c) (ii), (iii) and (iv)(d) (i), (ii) and (iv)

In case of a fire, before the firemen use the water, they shut off the main electrical supply for the area. Explain the reason behind this.

WHAT IS THE DERIVATION OF THE FORMULA OF APPARENT DEPTH AND APPARENT HEIGHT?

How many molecules and atoms are present in 5O2?

The process of passing an electric current through a liquid is known as ___________.

What is projectile in term of nuclear energy

8. 12.78g of organic compound containing c,h,o undergoes combustion to form 25.56g co2 and 10.46g of water.find the emperical formula of the compound

Question 7 Explain the process of formation of petroleum. Name any three constituents of petroleum.

Anion A form hexagonal close packing and cation B occupy only 2/3 of octahedral voids in it, the general formula of compound is

Which metals are extracted by Carbon based smelting?

Question 4Which of the following are exothermic processes?(i) Reaction of water with quicklime(ii) Dilution of an acid(iii) Evaporation of water(iv) Sublimation of camphor (crystals)(a) (i) and (ii)(b) (ii) and (iii)(c) (i) and (iv)(d) (iii) and (iv)

State the effects of green house gases on the atmosphere.

Do plastics react with the acids like sulphuric acid ? And if they do so, then can we characterise them as non corrosive?

At what temperature R.M.S. velocity of oxygen will be half as that of methane at 27^° C

if oil is being poured in water they don't mix but when detergent is added to it the water and oil get mixed why?

why intrinsic semiconductors are heat sensitive?

Structure of a mixed oxide is Cubic close packed The Cubic unit cell of mixed oxide is composed of oxide ions one fourth of the tetrahedral voids are occupied by divalent metal A and octahedral voids are occupied by monovalent metal B the formula of the oxide is

What is valency . what is the formula

Question 2:Why aluminium is used for wrapping food items?

Which of the following is/are ambident nucleophiles?

Question 7Name two metals which will displace hydrogen from dilute acids and two metals which will not.

Question 15 Name two major non-metals which are present in fertilizers and enhance the growth of plants.

why carbon is hard

(a) What is chemical equation ? (b) Why it is necessary to balance a chemical equation ? (c) What are the limitation of a chemical equation ?

Combustion of fossil fuels generates a lot of air pollution. Can you suggest any two alternative sources of energy which do not cause any pollution?​

Are all precipitations reactions double displacement reactions?

14. 0.2 g of sample of H202 required 10 ml of1N KMNO solution in a titration in presence of dil.H2SO4. The percentage purity of H202 is(1) 25%(2) 65%(3) 85%(4) 95%

The energy required to break one bond in DNA is 10−20. This value in eV is nearly:

What is the observation that can be made when calcium reacts with water?

Which of the following formulae is/are correct?

what are mint crystals?

Production of synthetic fibre helps in the conversation of forest. Explain.

Properties of hydrogen resembles from elements of following groups:

Why the outermost zone of flame is not visible?

Arrange the following fibres in the order of increasing strength (keeping the fibre of least strength first) : Nylon, Cotton , Wool, Polyester, Silk

What state or phase of material are crystals?

The molecular formula of magnesium chloride is:

Combustion of fossil fuels generates a lot of air pollution. Can you suggest any two alternative sources of energy which do not cause any pollution?