7248 + Interview Questions in Chemistry Page 21 InterviewSolution

1001.	The wastewater is passed through which bars?
Answer» The wastewater is passed through which bars?

Discussion

1002.	Match the following for the flame of a candle.
Answer» Match the following for the flame of a candle.

Discussion

1003.	Difference between mass number, atomic mass, Atomic number
Answer» Difference between mass number, atomic mass, Atomic number

Discussion

1004.	Which of the following options can be correctly associated with fuels?
Answer» Which of the following options can be correctly associated with fuels?

Discussion

1005.	Question 18(a) The slow process of conversion of dead vegetation into coal is called___.(b) Coal and petroleum are formed from the dead remains of organisms and are known as ___.(c) The black thick liquid with ___ smell is known as coal tar(d) During the processing of coal to get coke, coal tar and ___ are also obtained.(e) The process of separating the various constituents of petroleum is known as ___.(f) Excessive burning of fossil fuels is a major cause of ___.
Answer» Question 18 (a) The slow process of conversion of dead vegetation into coal is called___. (b) Coal and petroleum are formed from the dead remains of organisms and are known as ___. (c) The black thick liquid with ___ smell is known as coal tar (d) During the processing of coal to get coke, coal tar and ___ are also obtained. (e) The process of separating the various constituents of petroleum is known as ___. (f) Excessive burning of fossil fuels is a major cause of ___.

Discussion

1006.	Question 7How is rayon made? Give one advantage of using rayon.
Answer» Question 7 How is rayon made? Give one advantage of using rayon.

1006.

Question 7How is rayon made? Give one advantage of using rayon.

Answer»

Question 7

How is rayon made? Give one advantage of using rayon.

Discussion

1007.	Question 1What is meant by a substance?
Answer» Question 1 What is meant by a substance?

Discussion

1008.	Which of the following decomposition reaction occurs with the absorption of electrical energy?
Answer» Which of the following decomposition reaction occurs with the absorption of electrical energy?

Discussion

1009.	44. Sigma bond is stronger in bf3 or in f2
Answer» 44. Sigma bond is stronger in bf3 or in f2

Discussion

1010.	Haow does Carbon Monoxide affect the air?
Answer» Haow does Carbon Monoxide affect the air?

Discussion

1011.	which burns quickly when exposed to fire 1.wool 2.silk 3.acryli
Answer» which burns quickly when exposed to fire 1.wool 2.silk 3.acryli

Discussion

1012.	What is rust? What is its action on pH paper? [3 MARKS]
Answer» What is rust? What is its action on pH paper? [3 MARKS]

Discussion

1013.	How to calculate pi-bonds and sigma-bonds in any molecules or compounds?
Answer» How to calculate pi-bonds and sigma-bonds in any molecules or compounds?

Discussion

1014.	When a glass tumbler is inverted on a candle, the candle extinguishes due to lack of
Answer» When a glass tumbler is inverted on a candle, the candle extinguishes due to lack of

Discussion

1015.	Are alloys always of homogeneous mixture or sometimes it is heterogeneous also??
Answer» Are alloys always of homogeneous mixture or sometimes it is heterogeneous also??

Discussion

1016.	A small bottle contains powdered beryllium (Be) and gaseous Radon which is used as a source of α− particles. Neutrons are produced when α− particles of the radon react with beryllium. The yield of this reaction is (1/4000) i.e. only one α− particle out of 4000 induced the reaction. Find the amount of radon (Rn222) originally induced into the source, if it produces 1.2×106 neutrons per second after 7.6 days.[T1/2 of Rn=3.8 days]
Answer» A small bottle contains powdered beryllium $(Be)$ and gaseous $Radon$ which is used as a source of $α -$ particles. Neutrons are produced when $α -$ particles of the radon react with beryllium. The yield of this reaction is $(1 / 4000)$ i.e. only one $α -$ particle out of $4000$ induced the reaction. Find the amount of radon $(R n^{222})$ originally induced into the source, if it produces $1.2 \times 10^{6}$ neutrons per second after $7.6 days$ . $[T_{1 / 2} of R n = 3.8 days]$

Discussion

1017.	How to solve a chemical equation? Explain with an example.
Answer» How to solve a chemical equation? Explain with an example.

Discussion

1018.	Name the fuel which is gradually replacing petrol and diesel in automobiles.
Answer» Name the fuel which is gradually replacing petrol and diesel in automobiles.

Discussion

1019.	The products obtained from destructive distillation of coal are: 1) Coal tar 2) Coal Gas 3) Coke 4) Ammonia Arrange these products in the increasing order of their amounts produced.
Answer» The products obtained from destructive distillation of coal are: 1) Coal tar 2) Coal Gas 3) Coke 4) Ammonia Arrange these products in the increasing order of their amounts produced.

Discussion

1020.	18. Find out the building blocks of the following polymers: POLYESTER,POLYSTYRENE,BAKELITE, and RUBBER
Answer» 18. Find out the building blocks of the following polymers: POLYESTER,POLYSTYRENE,BAKELITE, and RUBBER

Discussion

1021.	50.The successive ionization energies for element X is given below IE1:250 kJ mol-1 IE2:820 IE3:1100 IE4:1400 Find out the number of valence electron from element X 3,2,4,1
Answer» 50.The successive ionization energies for element X is given below IE1:250 kJ mol-1 IE2:820 IE3:1100 IE4:1400 Find out the number of valence electron from element X 3,2,4,1

Discussion

1022.	Question 5:Fill in the blanks:Air is a matter because it has ________and _____and it can be_________ _.(b) The molecules are made up of _______.(c) The quantity of matter in an object is called it’s _______.
Answer» Question 5: Fill in the blanks: Air is a matter because it has ________and _____and it can be_________ _. (b) The molecules are made up of _______. (c) The quantity of matter in an object is called it’s _______.

1022.

Question 5:Fill in the blanks:Air is a matter because it has ______and _and it can be_______ _.(b) The molecules are made up of _.(c) The quantity of matter in an object is called it’s _.

Answer»

Question 5:

Fill in the blanks:

Air is a matter because it has ________and _____and it can be_________ _.

(b) The molecules are made up of _______.

(c) The quantity of matter in an object is called it’s _______.

Discussion

1023.	which one is more acidic in aqueous solutions AND why?a.NiCl2b fecl3c alcl3d becl2
Answer» which one is more acidic in aqueous solutions AND why? a.NiCl2 b fecl3 c alcl3 d becl2

Discussion

1024.	Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water The balanced chemical equation for the following word equation is:
Answer» Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water The balanced chemical equation for the following word equation is:

Discussion

1025.	Two samples ‘m’ and ‘n’ of slaked lime were obtained from two different reactions. The details about their composition are as follows: ‘sample m’ mass : 7gMass of constituent oxygen : 2gMass of constituent calcium : 5g‘sample n’ mass : 1.4gMass of constituent oxygen : 0.4gMass of constituent calcium : 1.0gWhich law of chemical combination does this prove? Explain.
Answer» Two samples ‘m’ and ‘n’ of slaked lime were obtained from two different reactions. The details about their composition are as follows: ‘sample m’ mass : 7g Mass of constituent oxygen : 2g Mass of constituent calcium : 5g ‘sample n’ mass : 1.4g Mass of constituent oxygen : 0.4g Mass of constituent calcium : 1.0g Which law of chemical combination does this prove? Explain.

Discussion

1026.	Two bodies A and B are brought into contact with one another and heat flows from A to B. Which of the following statement is true?
Answer» Two bodies A and B are brought into contact with one another and heat flows from A to B. Which of the following statement is true?

Discussion

1027.	Phosphorus is stored in water because:
Answer» Phosphorus is stored in water because:

Discussion

1028.	the ratio of the energy required to remove an electron frim the first three bohr orbits of hydrogen i
Answer» the ratio of the energy required to remove an electron frim the first three bohr orbits of hydrogen i

Discussion

1029.	As a responsible citizen, what steps should be taken by us to decrease the adverse effects of plastic on the environment? [5 MARKS]
Answer» As a responsible citizen, what steps should be taken by us to decrease the adverse effects of plastic on the environment? [5 MARKS]

Discussion

1030.	Oxides of nitrogen and sulphur cause ______ rain when reacted with water vapour present in atmosphere.
Answer» Oxides of nitrogen and sulphur cause ______ rain when reacted with water vapour present in atmosphere.

Discussion

1031.	The mass of an electron can be expressed as (A) 0.512 MeV (B) 8.19 × 10–14J/c2(C) 9.1 × 10–31 kg (D) 0.00055 amu
Answer» The mass of an electron can be expressed as (A) 0.512 MeV (B) 8.19 × 10–14J/c2 (C) 9.1 × 10–31 kg (D) 0.00055 amu

Discussion

1032.	A 5.0 g sample of natural gas consisting of CH4,C2H4 was burnt in excess of oxygen yielding 14.5 g CO2 and some H2O as products. What is weight percentage of CH4 and C2H4 in mixure? (A) 39.2, 60.8(C) 52.35, 46.20(B) 40.32, 30.52(D) 60.8, 39.2
Answer» A 5.0 g sample of natural gas consisting of CH4,C2H4 was burnt in excess of oxygen yielding 14.5 g CO2 and some H2O as products. What is weight percentage of CH4 and C2H4 in mixure? (A) 39.2, 60.8(C) 52.35, 46.20(B) 40.32, 30.52(D) 60.8, 39.2

Discussion

1033.	What is evaporation?
Answer» What is evaporation?

Discussion

1034.	Explain the following.(i) Methane is called marsh gas.(ii) Petrol and diesel are fossil fuels.
Answer» Explain the following. (i) Methane is called marsh gas. (ii) Petrol and diesel are fossil fuels.

1034.

Explain the following.(i) Methane is called marsh gas.(ii) Petrol and diesel are fossil fuels.

Answer»

Explain the following.

(i) Methane is called marsh gas.

(ii) Petrol and diesel are fossil fuels.

Discussion

1035.	Filtration is helpful in separating an insoluble __________ from a __________.
Answer» Filtration is helpful in separating an insoluble __________ from a __________.

Discussion

1036.	How is e=mc^2
Answer» How is e=mc^2

Discussion

1037.	4. 896 ml of a mixture of co and carbon dioxide weight 1. 28 g at ntp calculate the volume of carbon dioxide in the mixture at ntp
Answer» 4. 896 ml of a mixture of co and carbon dioxide weight 1. 28 g at ntp calculate the volume of carbon dioxide in the mixture at ntp

Discussion

1038.	Write the characteristics and some important uses of coal.
Answer» Write the characteristics and some important uses of coal.

Discussion

1039.	How gaseous cation is formed?
Answer» How gaseous cation is formed?

Discussion

1040.	Question 5.1Translate the following statement into chemical equation and then balance it:Hydrogen gas combines with nitrogen to form ammonia.
Answer» Question 5.1 Translate the following statement into chemical equation and then balance it: Hydrogen gas combines with nitrogen to form ammonia.

Discussion

1041.	What is the composition of air?
Answer» What is the composition of air?

Discussion

1042.	Aluminium reacts with chlorine to produce
Answer» Aluminium reacts with chlorine to produce

Discussion

1043.	What is the main component of natural gas?
Answer» What is the main component of natural gas?

Discussion

1044.	Dead organisms are transformed into petroleum and natural gas in the:
Answer» Dead organisms are transformed into petroleum and natural gas in the:

Discussion

1045.	The ratio of kinetic energy of a planet at perigee and apogee during it motion around sun in elliptical orbit of eccentricity e is?
Answer» The ratio of kinetic energy of a planet at perigee and apogee during it motion around sun in elliptical orbit of eccentricity e is?

Discussion

1046.	The random movement of particles is the least in ___ .
Answer» The random movement of particles is the least in ___ .

Discussion

1047.	Which substance is used for metalling the roads these days in place of coal tar ?
Answer» Which substance is used for metalling the roads these days in place of coal tar ?

Discussion

1048.	Did you know that the atmosphere only contains about 1% of total global carbon?
Answer» Did you know that the atmosphere only contains about 1% of total global carbon?

Discussion

1049.	The bohr's formula shows that the third shell should have 18 ELECTRONS whereas it is 2,8,8,18 why is it so???
Answer» The bohr's formula shows that the third shell should have 18 ELECTRONS whereas it is 2,8,8,18 why is it so???

Discussion

1050.	Fill in the blanks : (a) A reaction in which two or more substances combine to form a single substance is called a ___ reaction. (b) A ___ is a substance which changes the rate of a chemical reaction without undergoing a chemical change. (c) The formation of gas bubbles in a liquid during a reaction is called___ (d) The reaction between an acid and a base is called ___ (e) Soluble bases are called ___ (f) The chemical change involving iron and hydrochloric acid illustrates a ___ reaction. (g) In the type of reaction called ___ two compounds exchange their positive and negative radicals respectively. (h) A catalyst either ___ or ___ the rate of a chemical change but itself remains ___ at the end of the reaction. (i) The chemical reaction between hydogen and chlorine is a ___ reaction (j) When a piece of copper is added to silver nitrate solutuions, it turns ___ in colour.
Answer» Fill in the blanks : (a) A reaction in which two or more substances combine to form a single substance is called a ___ reaction. (b) A ___ is a substance which changes the rate of a chemical reaction without undergoing a chemical change. (c) The formation of gas bubbles in a liquid during a reaction is called___ (d) The reaction between an acid and a base is called ___ (e) Soluble bases are called ___ (f) The chemical change involving iron and hydrochloric acid illustrates a ___ reaction. (g) In the type of reaction called ___ two compounds exchange their positive and negative radicals respectively. (h) A catalyst either ___ or ___ the rate of a chemical change but itself remains ___ at the end of the reaction. (i) The chemical reaction between hydogen and chlorine is a ___ reaction (j) When a piece of copper is added to silver nitrate solutuions, it turns ___ in colour.

1050.

Fill in the blanks : (a) A reaction in which two or more substances combine to form a single substance is called a _ reaction. (b) A _ is a substance which changes the rate of a chemical reaction without undergoing a chemical change. (c) The formation of gas bubbles in a liquid during a reaction is called_ (d) The reaction between an acid and a base is called _ (e) Soluble bases are called _ (f) The chemical change involving iron and hydrochloric acid illustrates a _ reaction. (g) In the type of reaction called _ two compounds exchange their positive and negative radicals respectively. (h) A catalyst either _ or _ the rate of a chemical change but itself remains _ at the end of the reaction. (i) The chemical reaction between hydogen and chlorine is a _ reaction (j) When a piece of copper is added to silver nitrate solutuions, it turns _ in colour.

Answer»

Fill in the blanks :

(a) A reaction in which two or more substances combine to form a single substance is called a ___ reaction.

(b) A ___ is a substance which changes the rate of a chemical reaction without undergoing a chemical change.

(c) The formation of gas bubbles in a liquid during a reaction is called___

(d) The reaction between an acid and a base is called ___

(e) Soluble bases are called ___

(f) The chemical change involving iron and hydrochloric acid illustrates a ___ reaction.

(g) In the type of reaction called ___ two compounds exchange their positive and negative radicals respectively.

(h) A catalyst either ___ or ___ the rate of a chemical change but itself remains ___ at the end of the reaction.

(i) The chemical reaction between hydogen and chlorine is a ___ reaction

(j) When a piece of copper is added to silver nitrate solutuions, it turns ___ in colour.

Discussion

Explore topic-wise InterviewSolutions in .

The wastewater is passed through which bars?

Match the following for the flame of a candle.

Difference between mass number, atomic mass, Atomic number

Which of the following options can be correctly associated with fuels?

Question 7How is rayon made? Give one advantage of using rayon.

Question 1What is meant by a substance?

Which of the following decomposition reaction occurs with the absorption of electrical energy?

44. Sigma bond is stronger in bf3 or in f2

Haow does Carbon Monoxide affect the air?

which burns quickly when exposed to fire 1.wool 2.silk 3.acryli

What is rust? What is its action on pH paper? [3 MARKS]

How to calculate pi-bonds and sigma-bonds in any molecules or compounds?

When a glass tumbler is inverted on a candle, the candle extinguishes due to lack of

Are alloys always of homogeneous mixture or sometimes it is heterogeneous also??

How to solve a chemical equation? Explain with an example.

Name the fuel which is gradually replacing petrol and diesel in automobiles.

The products obtained from destructive distillation of coal are: 1) Coal tar 2) Coal Gas 3) Coke 4) Ammonia Arrange these products in the increasing order of their amounts produced.

18. Find out the building blocks of the following polymers: POLYESTER,POLYSTYRENE,BAKELITE, and RUBBER

50.The successive ionization energies for element X is given below IE1:250 kJ mol-1 IE2:820 IE3:1100 IE4:1400 Find out the number of valence electron from element X 3,2,4,1

Question 5:Fill in the blanks:Air is a matter because it has ________and _____and it can be_________ _.(b) The molecules are made up of _______.(c) The quantity of matter in an object is called it’s _______.

which one is more acidic in aqueous solutions AND why?a.NiCl2b fecl3c alcl3d becl2

Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water The balanced chemical equation for the following word equation is:

Two bodies A and B are brought into contact with one another and heat flows from A to B. Which of the following statement is true?

Phosphorus is stored in water because:

the ratio of the energy required to remove an electron frim the first three bohr orbits of hydrogen i

As a responsible citizen, what steps should be taken by us to decrease the adverse effects of plastic on the environment? [5 MARKS]

Oxides of nitrogen and sulphur cause ______ rain when reacted with water vapour present in atmosphere.

The mass of an electron can be expressed as (A) 0.512 MeV (B) 8.19 × 10–14J/c2(C) 9.1 × 10–31 kg (D) 0.00055 amu

A 5.0 g sample of natural gas consisting of CH4,C2H4 was burnt in excess of oxygen yielding 14.5 g CO2 and some H2O as products. What is weight percentage of CH4 and C2H4 in mixure? (A) 39.2, 60.8(C) 52.35, 46.20(B) 40.32, 30.52(D) 60.8, 39.2

What is evaporation?

Explain the following.(i) Methane is called marsh gas.(ii) Petrol and diesel are fossil fuels.

Filtration is helpful in separating an insoluble __________ from a __________.

How is e=mc^2

4. 896 ml of a mixture of co and carbon dioxide weight 1. 28 g at ntp calculate the volume of carbon dioxide in the mixture at ntp

Write the characteristics and some important uses of coal.

How gaseous cation is formed?

Question 5.1Translate the following statement into chemical equation and then balance it:Hydrogen gas combines with nitrogen to form ammonia.

What is the composition of air?

Aluminium reacts with chlorine to produce

What is the main component of natural gas?

Dead organisms are transformed into petroleum and natural gas in the:

The ratio of kinetic energy of a planet at perigee and apogee during it motion around sun in elliptical orbit of eccentricity e is?

The random movement of particles is the least in ___ .

Which substance is used for metalling the roads these days in place of coal tar ?

Did you know that the atmosphere only contains about 1% of total global carbon?

The bohr's formula shows that the third shell should have 18 ELECTRONS whereas it is 2,8,8,18 why is it so???

Question 5:Fill in the blanks:Air is a matter because it has ______and _and it can be_______ _.(b) The molecules are made up of _.(c) The quantity of matter in an object is called it’s _.

Filtration is helpful in separating an insoluble from a .