5083 + Interview Questions in Chemistry Page 1 InterviewSolution

1.	The effervescence when vinegar is added to baking soda is due to the evolution of
Answer» The effervescence when vinegar is added to baking soda is due to the evolution of

Discussion

2.	The colour of residue left behind on heating lead nitrate when it is still hot is :(1) green(2) yellow(3) black(4) reddish-brown
Answer» The colour of residue left behind on heating lead nitrate when it is still hot is : (1) green (2) yellow (3) black (4) reddish-brown

Discussion

3.	Name any three methods of separating substances in dry conditions, and define them. [3 MARKS]
Answer» Name any three methods of separating substances in dry conditions, and define them. [3 MARKS]

Discussion

4.	What is the difference between enthalpy and entropy
Answer» What is the difference between enthalpy and entropy

Discussion

5.	What colour is given when acid is added to phenolphthalein?
Answer» What colour is given when acid is added to phenolphthalein?

Discussion

6.	Which of the following gases is necessary for combustion of a substance?
Answer» Which of the following gases is necessary for combustion of a substance?

Discussion

7.	Following figure shows a _____________________ change.
Answer» Following figure shows a _____________________ change.

7.

Following figure shows a _____________________ change.

Answer»

Following figure shows a _____________________ change.

Discussion

8.	Rate constant of a first order reaction is 0.0693 min−1. If we start with 20 mol L−1, it is reduced to 2.5 mol L−1 in:(Given log2=0.3010)
Answer» Rate constant of a first order reaction is $0.0693 {min}^{- 1}$ . If we start with $20 {mol L}^{- 1}$ , it is reduced to $2.5 {mol L}^{- 1}$ in: (Given $log 2 = 0.3010$ )

Discussion

9.	Write answer to the following questions.(a) How does the use of a detergent help to clean soiled clothes ?(b) How will you check with the help of soap powder whether water is hard ?(c) What are the important ingredients of a toothpaste , and what is the function of each ?(d) What are the ingredients of cements ?(e) What will happen if cement is not used in making concrete ?(f) Make a list of detergents that you use.(g) What should be expected from a detergent for delicate garments ?(h) What is meant by ' surface activity'? Name three chemicals responsible for the surface activity of various detergents.
Answer» Write answer to the following questions. (a) How does the use of a detergent help to clean soiled clothes ? (b) How will you check with the help of soap powder whether water is hard ? (c) What are the important ingredients of a toothpaste , and what is the function of each ? (d) What are the ingredients of cements ? (e) What will happen if cement is not used in making concrete ? (f) Make a list of detergents that you use. (g) What should be expected from a detergent for delicate garments ? (h) What is meant by ' surface activity'? Name three chemicals responsible for the surface activity of various detergents.

Discussion

10.	Which pair of species has the same percentage of carbon?[1 mark]
Answer» Which pair of species has the same percentage of carbon? [1 mark]

Discussion

11.	While playing cricket, Akash felt thirsty and drank water from a nearby lake. This lake contains contaminated water. Which among the following diseases can Akash possibly suffer from?
Answer» While playing cricket, Akash felt thirsty and drank water from a nearby lake. This lake contains contaminated water. Which among the following diseases can Akash possibly suffer from?

Discussion

12.	Which of the following substance is added during water treatment?
Answer» Which of the following substance is added during water treatment?

Discussion

13.	A tool which is used to convert wool fleece into narrow untwisted fibres is called slivers. Can you please explain in detail.
Answer» A tool which is used to convert wool fleece into narrow untwisted fibres is called slivers. Can you please explain in detail.

Discussion

14.	Which of the following factors will not result in groundwater depletion?
Answer» Which of the following factors will not result in groundwater depletion?

Discussion

15.	Which of the following are the properties of metals?
Answer» Which of the following are the properties of metals?

Discussion

16.	Fill in the blanks:(a) Cleaning of water is a process of removing ____________. (b) Wastewater released by houses is called _________. (c) Dried __________ is used as manure.(d) Drains get blocked by _________ and _________.
Answer» Fill in the blanks: (a) Cleaning of water is a process of removing ____________. (b) Wastewater released by houses is called _________. (c) Dried __________ is used as manure. (d) Drains get blocked by _________ and _________.

Discussion

17.	Question 15Name two gases which are mainly responsible for acid rain?
Answer» Question 15 Name two gases which are mainly responsible for acid rain?

Discussion

18.	Define the following terms: [3 Marks] i) Infiltration ii) Aquifer iii) Drip Irrigation
Answer» Define the following terms: [3 Marks] i) Infiltration ii) Aquifer iii) Drip Irrigation

Discussion

19.	Reliez les colonnes.1. la limonade (a) un pain2. le camembert (b) un légume3. la glace (c) un fromage4. l'ananas (d) une boisson5. le haricot vert (e) une épice6. la baguette (f) un dessert7. le poivre (g) un fruit
Answer» Reliez les colonnes. 1. la limonade (a) un pain 2. le camembert (b) un légume 3. la glace (c) un fromage 4. l'ananas (d) une boisson 5. le haricot vert (e) une épice 6. la baguette (f) un dessert 7. le poivre (g) un fruit

Discussion

20.	Valency of Sulfer is 2 Valency of Oxygen is 2 then why do we write S20( sulferoxide
Answer» Valency of Sulfer is 2 Valency of Oxygen is 2 then why do we write S20( sulferoxide

Discussion

21.	33 The enthalpy of formation of ammonia is-46.0 kJ mol-1. The enthalpy for the reaction(1) 46 kJ(2) 46 kJ(3) 184 kJ(4) -184 kJ
Answer» 33 The enthalpy of formation of ammonia is-46.0 kJ mol-1. The enthalpy for the reaction(1) 46 kJ(2) 46 kJ(3) 184 kJ(4) -184 kJ

Discussion

22.	Which of the following are uses of chlorine?
Answer» Which of the following are uses of chlorine?

Discussion

23.	Question 10What are the differences between natural and synthetic fibres?
Answer» Question 10 What are the differences between natural and synthetic fibres?

23.

Question 10What are the differences between natural and synthetic fibres?

Answer»

Question 10

What are the differences between natural and synthetic fibres?

Discussion

24.	Complétez an utilisant les verbes donnés:écrire, aimer, être, boire, prendre, aller, finir, lire, dire, apprendre, acheter, choisir.
Answer» Complétez an utilisant les verbes donnés: écrire, aimer, être, boire, prendre, aller, finir, lire, dire, apprendre, acheter, choisir.

Discussion

25.	What are exothermic and endothermic reactions? Give examples.
Answer» What are exothermic and endothermic reactions? Give examples.

Discussion

26.	Where does the rain fall? What do people use when it rains?
Answer» Where does the rain fall? What do people use when it rains?

Discussion

27.	23.two compound in and B are mixed in equal proportion to form the productA+B-C+D at equilibrium one third of Aand B consumed the eqquilibrium constant is
Answer» 23.two compound in and B are mixed in equal proportion to form the productA+B-C+D at equilibrium one third of Aand B consumed the eqquilibrium constant is

Discussion

28.	How is interconversion of states of matter different from chemical reaction ?
Answer» How is interconversion of states of matter different from chemical reaction ?

Discussion

29.	If Li, Na, and an unknown element X, form a Döbereiner's triad, then the atomic mass of X is ______ amu. 39
Answer» If Li, Na, and an unknown element X, form a Döbereiner's triad, then the atomic mass of X is ______ amu. 39

Discussion

30.	Graphite is a conductor.Though it is a covalent solid.It also has no free electrons in atoms of it's structure.
Answer» Graphite is a conductor.Though it is a covalent solid.It also has no free electrons in atoms of it's structure.

Discussion

31.	Have you ever wondered where the sewage that comes out of our houses goes? What happens in villages?
Answer» Have you ever wondered where the sewage that comes out of our houses goes? What happens in villages?

Discussion

32.	34. 1mole of KMnO4 in acidic medium reacts with 1.67 moles of Mx+ and gives MO3- . The value of x is ?
Answer» 34. 1mole of KMnO4 in acidic medium reacts with 1.67 moles of Mx+ and gives MO3- . The value of x is ?

Discussion

33.	Magnetite is an ore of ___.
Answer» Magnetite is an ore of ___.

Discussion

34.	Question 2(b) State whether the following statements are true or false. In case a statement is false, write the corrected statement in your notebook. Formation of manure from leaves is a physical change.
Answer» Question 2(b) State whether the following statements are true or false. In case a statement is false, write the corrected statement in your notebook. Formation of manure from leaves is a physical change.

Discussion

35.	Question 17 Write word equations for two chemical reactions with the help of materials given in the box.
Answer» Question 17 Write word equations for two chemical reactions with the help of materials given in the box.

35.

Question 17 Write word equations for two chemical reactions with the help of materials given in the box.

Answer»

Question 17

Write word equations for two chemical reactions with the help of materials given in the box.

Discussion

36.	Single displacement reaction involves:
Answer» Single displacement reaction involves:

Discussion

37.	Describe the process of neutralization with the help of an example.
Answer» Describe the process of neutralization with the help of an example.

Discussion

38.

Four students, (A), (B), (C) and (D) observed the colour and solubility of iron, sulphur and iron sulphide in carbon disulphide. The tick mark (✔) represents 'soluble', and cross mark (✕) represents 'insoluble', in carbon disulphide. Their observations are tabulated below. Student Colour Solubility in carbon disulphide Fe S FeS Fe S FeS (A) Yellow Silvery Greyish silver (✔) (✕) (✔) Silvery Orange Reddish brown (✕) (✔) (✔) (B) (C) Grey Yellow Greyish black (✕) (✔) (✕) (D) Silvery White Silvery white (✔) (✕) (✕) The student, who correctly reported the observations, is student :(1) (A)(2) (B)(3) (C)(4) (D)

Answer» Four students, (A), (B), (C) and (D) observed the colour and solubility of iron, sulphur and iron sulphide in carbon disulphide. The tick mark (✔) represents 'soluble', and cross mark (✕) represents 'insoluble', in carbon disulphide. Their observations are tabulated below.

Student	Colour			Solubility in carbon disulphide
Student	Fe	S	FeS	Fe	S	FeS
(A)	Yellow	Silvery	Greyish silver	(✔)	(✕)	(✔)
(A)	Silvery	Orange	Reddish brown	(✕)	(✔)	(✔)
(B)	Silvery	Orange	Reddish brown	(✕)	(✔)	(✔)
(C)	Grey	Yellow	Greyish black	(✕)	(✔)	(✕)
(D)	Silvery	White	Silvery white	(✔)	(✕)	(✕)

The student, who correctly reported the observations, is student :

(1) (A)

(2) (B)

(3) (C)

(4) (D)

Discussion

39.	What is aluminium used for food packaging?
Answer» What is aluminium used for food packaging?

Discussion

40.	Question 8What produces more severe burns, boiling water or steam?
Answer» Question 8 What produces more severe burns, boiling water or steam?

Discussion

41.	Why are the footprints left on the moon by the Apollo astronauts still visible today?
Answer» Why are the footprints left on the moon by the Apollo astronauts still visible today?

Discussion

42.	A homogenous mixture of a solute in a solvent is called a ___.
Answer» A homogenous mixture of a solute in a solvent is called a ___.

Discussion

43.	what are metals and non metals ?, tell all the main ponis and explain.
Answer» what are metals and non metals ?, tell all the main ponis and explain.

Discussion

44.	Question 2 (i)Write equation for the reaction of iron with steam.
Answer» Question 2 (i) Write equation for the reaction of iron with steam.

Discussion

45.	Graphene is an allotrope of carbon. What is the shape of the rings in its structure which is formed due to carbon combining with each other through covalent bonds?
Answer» Graphene is an allotrope of carbon. What is the shape of the rings in its structure which is formed due to carbon combining with each other through covalent bonds?

Discussion

46.	Can one atom be called an element also? Can one molecule having more than one type of atom be called a compound also?
Answer» Can one atom be called an element also? Can one molecule having more than one type of atom be called a compound also?

Discussion

47.	Question 4The place meant for conservation of biodiversity in their natural habitat are(i) Zoological garden(ii) Botanical garden(iii) Wildlife sanctuary(iv) National park(a) i & ii(b) ii & iii(c) iii & iv(d) i & iv
Answer» Question 4 The place meant for conservation of biodiversity in their natural habitat are (i) Zoological garden (ii) Botanical garden (iii) Wildlife sanctuary (iv) National park (a) i & ii (b) ii & iii (c) iii & iv (d) i & iv

Discussion

48.	Electrolysis can be used to determine atomic masses. A current of 0.55 A deposits 0.55 g of a certyain metal in 100 minutes. Calculate the atomic mass of the metal if equivalent weight= molecular weight3.
Answer» Electrolysis can be used to determine atomic masses. A current of $0.55 A$ deposits $0.55 g$ of a certyain metal in $100$ minutes. Calculate the atomic mass of the metal if $equivalent weight = \frac{molecular weight}{3}$ .

Discussion

49.	to avoisd bends in svcuba divers air is diluted wirh helium i donot unders†an
Answer» to avoisd bends in svcuba divers air is diluted wirh helium i donot unders†an

Discussion

50.	Question 24What is electrical resistivity? In a series electrical circuit comprising a resistor made up of a metallic wire, the ammeter reads 5 A. The reading of the ammeter decreases to half when the length of the wire is doubled. Why?
Answer» Question 24 What is electrical resistivity? In a series electrical circuit comprising a resistor made up of a metallic wire, the ammeter reads 5 A. The reading of the ammeter decreases to half when the length of the wire is doubled. Why?

Discussion

Explore topic-wise InterviewSolutions in .

The effervescence when vinegar is added to baking soda is due to the evolution of

The colour of residue left behind on heating lead nitrate when it is still hot is :(1) green(2) yellow(3) black(4) reddish-brown

Name any three methods of separating substances in dry conditions, and define them. [3 MARKS]

What is the difference between enthalpy and entropy

What colour is given when acid is added to phenolphthalein?

Which of the following gases is necessary for combustion of a substance?

Following figure shows a _____________________ change.

Rate constant of a first order reaction is 0.0693 min−1. If we start with 20 mol L−1, it is reduced to 2.5 mol L−1 in:(Given log2=0.3010)

Which pair of species has the same percentage of carbon?[1 mark]

While playing cricket, Akash felt thirsty and drank water from a nearby lake. This lake contains contaminated water. Which among the following diseases can Akash possibly suffer from?

Which of the following substance is added during water treatment?

A tool which is used to convert wool fleece into narrow untwisted fibres is called slivers. Can you please explain in detail.

Which of the following factors will not result in groundwater depletion?

Which of the following are the properties of metals?

Fill in the blanks:​(a) Cleaning of water is a process of removing ____________. (b) Wastewater released by houses is called _________. (c) Dried __________ is used as manure.(d) Drains get blocked by _________ and _________.

Question 15Name two gases which are mainly responsible for acid rain?

Define the following terms: [3 Marks] i) Infiltration ii) Aquifer iii) Drip Irrigation

Reliez les colonnes.1. la limonade (a) un pain2. le camembert (b) un légume3. la glace (c) un fromage4. l'ananas (d) une boisson5. le haricot vert (e) une épice6. la baguette (f) un dessert7. le poivre (g) un fruit

Valency of Sulfer is 2 Valency of Oxygen is 2 then why do we write S20( sulferoxide

33 The enthalpy of formation of ammonia is-46.0 kJ mol-1. The enthalpy for the reaction(1) 46 kJ(2) 46 kJ(3) 184 kJ(4) -184 kJ

Which of the following are uses of chlorine?

Question 10What are the differences between natural and synthetic fibres?

Complétez an utilisant les verbes donnés:écrire, aimer, être, boire, prendre, aller, finir, lire, dire, apprendre, acheter, choisir.

What are exothermic and endothermic reactions? Give examples.

Where does the rain fall? What do people use when it rains?

23.two compound in and B are mixed in equal proportion to form the productA+B-C+D at equilibrium one third of Aand B consumed the eqquilibrium constant is

How is interconversion of states of matter different from chemical reaction ?

If Li, Na, and an unknown element X, form a Döbereiner's triad, then the atomic mass of X is ______ amu. 39

Graphite is a conductor.Though it is a covalent solid.It also has no free electrons in atoms of it's structure.

Have you ever wondered where the sewage that comes out of our houses goes? What happens in villages?

34. 1mole of KMnO4 in acidic medium reacts with 1.67 moles of Mx+ and gives MO3- . The value of x is ?

Magnetite is an ore of ___.

Question 2(b) State whether the following statements are true or false. In case a statement is false, write the corrected statement in your notebook. Formation of manure from leaves is a physical change.

Question 17 Write word equations for two chemical reactions with the help of materials given in the box.

Single displacement reaction involves:

Describe the process of neutralization with the help of an example.

What is aluminium used for food packaging?

Question 8What produces more severe burns, boiling water or steam?

Why are the footprints left on the moon by the Apollo astronauts still visible today?

A homogenous mixture of a solute in a solvent is called a ___.

what are metals and non metals ?, tell all the main ponis and explain.

Question 2 (i)Write equation for the reaction of iron with steam.

Graphene is an allotrope of carbon. What is the shape of the rings in its structure which is formed due to carbon combining with each other through covalent bonds?

Can one atom be called an element also? Can one molecule having more than one type of atom be called a compound also?

Question 4The place meant for conservation of biodiversity in their natural habitat are(i) Zoological garden(ii) Botanical garden(iii) Wildlife sanctuary(iv) National park(a) i & ii(b) ii & iii(c) iii & iv(d) i & iv

Electrolysis can be used to determine atomic masses. A current of 0.55 A deposits 0.55 g of a certyain metal in 100 minutes. Calculate the atomic mass of the metal if equivalent weight= molecular weight3.

to avoisd bends in svcuba divers air is diluted wirh helium i donot unders†an

Question 24What is electrical resistivity? In a series electrical circuit comprising a resistor made up of a metallic wire, the ammeter reads 5 A. The reading of the ammeter decreases to half when the length of the wire is doubled. Why?

Fill in the blanks:(a) Cleaning of water is a process of removing ________. (b) Wastewater released by houses is called _. (c) Dried __ is used as manure.(d) Drains get blocked by _ and _____.