10223 + Interview Questions in Chemistry Page 193 InterviewSolution

9601.	Apart from Carbon, which other elements commonly form allotropes?
Answer» Apart from Carbon, which other elements commonly form allotropes?

Discussion

9602.	Which one of these is the correct symbol of element Zinc?
Answer» Which one of these is the correct symbol of element Zinc?

Discussion

9603.	Name one metal and one non-metal which exist as liquids at room temperature.
Answer» Name one metal and one non-metal which exist as liquids at room temperature.

Discussion

9604.	Low visibility during cold weather is due to
Answer» Low visibility during cold weather is due to

Discussion

9605.	When I fill air in tyres of my cycle. Why the pump becomes hot???
Answer» When I fill air in tyres of my cycle. Why the pump becomes hot???

Discussion

9606.	When CaCO3 is heated, it forms CaO and CO2. Which of these statements best describes the mass of the products if 100 g of CaCO3 is heated?
Answer» When CaCO3 is heated, it forms CaO and CO2. Which of these statements best describes the mass of the products if 100 g of CaCO3 is heated?

Discussion

9607.	Which formula represents the simplest whole number ratio of various atoms present in a compound?
Answer» Which formula represents the simplest whole number ratio of various atoms present in a compound?

Discussion

9608.	Which of the following is/are greenhouse gases?
Answer» Which of the following is/are greenhouse gases?

Discussion

9609.	During respiration, glucose and oxygen enter our body cell and waste products carbon dioxide and water leave the body cells by the process of : (a) effusion (b) osmosis (c) diffusion (d) plasmolysis
Answer» During respiration, glucose and oxygen enter our body cell and waste products carbon dioxide and water leave the body cells by the process of : (a) effusion (b) osmosis (c) diffusion (d) plasmolysis

9609.

During respiration, glucose and oxygen enter our body cell and waste products carbon dioxide and water leave the body cells by the process of : (a) effusion (b) osmosis (c) diffusion (d) plasmolysis

Answer»

During respiration, glucose and oxygen enter our body cell and waste products carbon dioxide and water leave the body cells by the process of :

(a) effusion (b) osmosis (c) diffusion (d) plasmolysis

Discussion

9610.	According to Modern Periodic Table, the properties of elements are a periodic function of their ________.
Answer» According to Modern Periodic Table, the properties of elements are a periodic function of their ________.

Discussion

9611.	Why organic liquid vaporises at a temperature below its boiling point in steam distillation? (Sir, I see lots of solutions for this question i didn't understand please give explanation in simpler way)
Answer» Why organic liquid vaporises at a temperature below its boiling point in steam distillation? (Sir, I see lots of solutions for this question i didn't understand please give explanation in simpler way)

Discussion

9612.	Question 14 In the refining of silver, the recovery of silver from silver nitrate solution involves displacement by copper metal. Write down the reaction involved.
Answer» Question 14 In the refining of silver, the recovery of silver from silver nitrate solution involves displacement by copper metal. Write down the reaction involved.

Discussion

9613.	Question 1 (c) Classify the following as chemical or physical changes: c. Rusting of almirah
Answer» Question 1 (c) Classify the following as chemical or physical changes: c. Rusting of almirah

Discussion

9614.	Name the elements water is made of. What are the valencies of these elements? Work out the chemical formula for water.
Answer» Name the elements water is made of. What are the valencies of these elements? Work out the chemical formula for water.

Discussion

9615.	Is the formula , F=mgh and P.E=mgh correct?
Answer» Is the formula , F=mgh and P.E=mgh correct?

Discussion

9616.	Iron (III)
Answer» Iron (III)

Discussion

9617.	(i) Electropositive nature of the element(s) increases down the group and decreases across the period (ii) Electronegativity of the element decreases down the group and increases across the period (iii) Atomic size increases down the group and decreases across a period (left to right) (iv) Metallic character increases down the group and decreases across a period. On the basis of the above trends of the Periodic Table, answer the following about the elements with atomic numbers 3 to 9. Which is the element with the smallest atomic size
Answer» (i) Electropositive nature of the element(s) increases down the group and decreases across the period (ii) Electronegativity of the element decreases down the group and increases across the period (iii) Atomic size increases down the group and decreases across a period (left to right) (iv) Metallic character increases down the group and decreases across a period. On the basis of the above trends of the Periodic Table, answer the following about the elements with atomic numbers 3 to 9. Which is the element with the smallest atomic size

9617.

(i) Electropositive nature of the element(s) increases down the group and decreases across the period (ii) Electronegativity of the element decreases down the group and increases across the period (iii) Atomic size increases down the group and decreases across a period (left to right) (iv) Metallic character increases down the group and decreases across a period. On the basis of the above trends of the Periodic Table, answer the following about the elements with atomic numbers 3 to 9. Which is the element with the smallest atomic size

Answer»

(i) Electropositive nature of the element(s) increases down the group and decreases across the period
(ii) Electronegativity of the element decreases down the group and increases across the period
(iii) Atomic size increases down the group and decreases across a period (left to right)
(iv) Metallic character increases down the group and decreases across a period.
On the basis of the above trends of the Periodic Table, answer the following about the elements with atomic numbers 3 to 9.

Which is the element with the smallest atomic size

Discussion

9618.	Question 56 Fill in the blanks to make the statement true. 10 cm2= ___ m2
Answer» Question 56 Fill in the blanks to make the statement true. $10 c m^{2} =$ ___ $m^{2}$

Discussion

9619.	Ray A produces Fluorescence on a Zinc Sulphide screen and Ray B produces fluorescence on a soda-glass screen. What are A and B respectively?
Answer» Ray A produces Fluorescence on a Zinc Sulphide screen and Ray B produces fluorescence on a soda-glass screen. What are A and B respectively?

Discussion

9620.	What is tincture of Iodine? Identify the solute and solvent in it. Why Tyndall effect is not seen in a true solution?
Answer» What is tincture of Iodine? Identify the solute and solvent in it. Why Tyndall effect is not seen in a true solution?

Discussion

9621.	The cation of an element has:
Answer» The cation of an element has:

Discussion

9622.	why do we see water droplets collected on the outer surface of a glass container,containing ice?
Answer» why do we see water droplets collected on the outer surface of a glass container,containing ice?

Discussion

9623.	All the things, including us are made up of matter. The diagram shows how some types of matter are classified. This diagram is not complete. Elements are often divided into sub-groups. What are the two sub -groups A and B?
Answer» All the things, including us are made up of matter. The diagram shows how some types of matter are classified. This diagram is not complete. Elements are often divided into sub-groups. What are the two sub -groups A and B?

9623.

All the things, including us are made up of matter. The diagram shows how some types of matter are classified. This diagram is not complete. Elements are often divided into sub-groups. What are the two sub -groups A and B?

Answer»

All the things, including us are made up of matter. The diagram shows how some types of matter are classified. This diagram is not complete. Elements are often divided into sub-groups. What are the two sub -groups A and B?

Discussion

9624.	Differences between H2 and 2H.
Answer» Differences between H2 and 2H.

Discussion

9625.	Why we say that gases has no fixed volume ?
Answer» Why we say that gases has no fixed volume ?

Discussion

9626.	What is meant by discrete orbits?
Answer» What is meant by discrete orbits?

Discussion

9627.	What is the energy dynamics of the 4th state of matter ?
Answer» What is the energy dynamics of the 4th state of matter ?

Discussion

9628.	Question 8(b) Convert into mole: (b) 20 g of water
Answer» Question 8(b) Convert into mole: (b) 20 g of water

Discussion

9629.	Carbon is known to form so many compounds because of
Answer» Carbon is known to form so many compounds because of

Discussion

9630.	The evaporation of a liquid can best be carried out in :
Answer» The evaporation of a liquid can best be carried out in :

Discussion

9631.	Consider the following statements: Which of the above statements are incorrect?
Answer» Consider the following statements: Which of the above statements are incorrect?

Discussion

9632.	Statement 1: Ionic compounds have high boiling points. Statement 2: The oppositely charged ions are held together by strong electrostatic forces of attraction and require more heat energy to break the bonds.
Answer» Statement 1: Ionic compounds have high boiling points. Statement 2: The oppositely charged ions are held together by strong electrostatic forces of attraction and require more heat energy to break the bonds.

Discussion

9633.	How does diffusion depend upon density?
Answer» How does diffusion depend upon density?

Discussion

9634.	In the laboratory preparation of nitric acid, it can be obtained below 200∘C or above 200∘C, but the lower temperature is preferred. Which of the following reason(s) is /are correct? i. The glass apparatus may break at a higher temperature. ii. At lower temperature, potassium or sodium sulphate is formed, which cannot be easily removed from the apparatus.
Answer» In the laboratory preparation of nitric acid, it can be obtained below $200^{\circ}$ C or above $200^{\circ}$ C, but the lower temperature is preferred. Which of the following reason(s) is /are correct? i. The glass apparatus may break at a higher temperature. ii. At lower temperature, potassium or sodium sulphate is formed, which cannot be easily removed from the apparatus.

9634.

In the laboratory preparation of nitric acid, it can be obtained below 200∘C or above 200∘C, but the lower temperature is preferred. Which of the following reason(s) is /are correct? i. The glass apparatus may break at a higher temperature. ii. At lower temperature, potassium or sodium sulphate is formed, which cannot be easily removed from the apparatus.

Answer»

In the laboratory preparation of nitric acid, it can be obtained below $200^{\circ}$ C or above $200^{\circ}$ C, but the lower temperature is preferred. Which of the following reason(s) is /are correct?

i. The glass apparatus may break at a higher temperature.

ii. At lower temperature, potassium or sodium sulphate is formed, which cannot be easily removed from the apparatus.

Discussion

9635.	Hydrogen forms _________ bonds with non metals
Answer» Hydrogen forms _________ bonds with non metals

Discussion

9636.	How we can change a proton into neutron and a neutron into proton? Is it possible?
Answer» How we can change a proton into neutron and a neutron into proton? Is it possible?

Discussion

9637.	Fe2O3+2Al→Al2O3+2Fe The above reaction is an example of a
Answer» $F e_{2} O_{3} + 2 A l \to A l_{2} O_{3} + 2 F e$ The above reaction is an example of a

Discussion

9638.	Which of the following elements has the electron configuration 2?
Answer» Which of the following elements has the electron configuration 2?

Discussion

9639.	Question 3 (a) Name three elements that have a single electron in their outermost shell.
Answer» Question 3 (a) Name three elements that have a single electron in their outermost shell.

Discussion

9640.	How does a rate of reaction change if we use the powdered form of reactants in place of pellets of reactants?
Answer» How does a rate of reaction change if we use the powdered form of reactants in place of pellets of reactants?

Discussion

9641.	The elements or compounds, which occur naturally in the earth's crust, are known as __________.
Answer» The elements or compounds, which occur naturally in the earth's crust, are known as __________.

Discussion

9642.	Dry air was passed successively through a solution of 5 gm of a solute in 80 gm of water and then through pure water. The loss in weight of solution was 2.50 gm and that of pure solvent 0.04 gm . What is the molecular weight of the solute?
Answer» Dry air was passed successively through a solution of 5 gm of a solute in 80 gm of water and then through pure water. The loss in weight of solution was 2.50 gm and that of pure solvent 0.04 gm . What is the molecular weight of the solute?

Discussion

9643.	Which is the best technique to separate coffee grains from coffee solution?
Answer» Which is the best technique to separate coffee grains from coffee solution?

Discussion

9644.	What is the name of the clear liquid formed when a solid dissolves in a liquid?
Answer» What is the name of the clear liquid formed when a solid dissolves in a liquid?

Discussion

9645.	N shell can have a maximum of _______ electrons.
Answer» N shell can have a maximum of _______ electrons.

Discussion

9646.	State two reasons for supposing that brass is a mixture and not a compound.
Answer» State two reasons for supposing that brass is a mixture and not a compound.

Discussion

9647.	In Celsius scale,300K is equivalent to X C.Value of X is
Answer» In Celsius scale,300K is equivalent to X C.Value of X is

Discussion

9648.	Element M forms a chloride with the formula MCl2 which is a solid with high melting point. What type of bond is in MCl2. Write the formula of the compound when M combines with sulphur, oxygen and nitrogen.
Answer» Element M forms a chloride with the formula $M C l_{2}$ which is a solid with high melting point. What type of bond is in $M C l_{2} .$ Write the formula of the compound when M combines with sulphur, oxygen and nitrogen.

Discussion

9649.	Which one of the following statements is not correct about the three states of matter i.e. solid, liquid and gaseous states?
Answer» Which one of the following statements is not correct about the three states of matter i.e. solid, liquid and gaseous states?

Discussion

9650.	All the gases form cathode rays and anode rays when electricity is passed through them: (i) What does the formation of cathode rays tell us about the atoms? (ii) What does the formation of anode rays tell us about the atoms?
Answer» All the gases form cathode rays and anode rays when electricity is passed through them: (i) What does the formation of cathode rays tell us about the atoms? (ii) What does the formation of anode rays tell us about the atoms?

Discussion

Explore topic-wise InterviewSolutions in .

Apart from Carbon, which other elements commonly form allotropes?

Which one of these is the correct symbol of element Zinc?

Name one metal and one non-metal which exist as liquids at room temperature.

Low visibility during cold weather is due to

When I fill air in tyres of my cycle. Why the pump becomes hot???

When CaCO3 is heated, it forms CaO and CO2. Which of these statements best describes the mass of the products if 100 g of CaCO3 is heated?

Which formula represents the simplest whole number ratio of various atoms present in a compound?

Which of the following is/are greenhouse gases?

During respiration, glucose and oxygen enter our body cell and waste products carbon dioxide and water leave the body cells by the process of : (a) effusion (b) osmosis (c) diffusion (d) plasmolysis

According to Modern Periodic Table, the properties of elements are a periodic function of their ________.

Why organic liquid vaporises at a temperature below its boiling point in steam distillation? (Sir, I see lots of solutions for this question i didn't understand please give explanation in simpler way)

Question 14 In the refining of silver, the recovery of silver from silver nitrate solution involves displacement by copper metal. Write down the reaction involved.

Question 1 (c) Classify the following as chemical or physical changes: c. Rusting of almirah

Name the elements water is made of. What are the valencies of these elements? Work out the chemical formula for water.

Is the formula , F=mgh and P.E=mgh correct?

Iron (III)

Question 56 Fill in the blanks to make the statement true. 10 cm2= ___ m2

Ray A produces Fluorescence on a Zinc Sulphide screen and Ray B produces fluorescence on a soda-glass screen. What are A and B respectively?

What is tincture of Iodine? Identify the solute and solvent in it. Why Tyndall effect is not seen in a true solution?

The cation of an element has:

why do we see water droplets collected on the outer surface of a glass container,containing ice?

All the things, including us are made up of matter. The diagram shows how some types of matter are classified. This diagram is not complete. Elements are often divided into sub-groups. What are the two sub -groups A and B?

Differences between H2 and 2H.

Why we say that gases has no fixed volume ?

What is meant by discrete orbits?

What is the energy dynamics of the 4th state of matter ?

Question 8(b) Convert into mole: (b) 20 g of water

Carbon is known to form so many compounds because of

The evaporation of a liquid can best be carried out in :

Consider the following statements: Which of the above statements are incorrect?

Statement 1: Ionic compounds have high boiling points. Statement 2: The oppositely charged ions are held together by strong electrostatic forces of attraction and require more heat energy to break the bonds.

How does diffusion depend upon density?

Hydrogen forms _________ bonds with non metals

How we can change a proton into neutron and a neutron into proton? Is it possible?

Fe2O3+2Al→Al2O3+2Fe The above reaction is an example of a

Which of the following elements has the electron configuration 2?

Question 3 (a) Name three elements that have a single electron in their outermost shell.

How does a rate of reaction change if we use the powdered form of reactants in place of pellets of reactants?

The elements or compounds, which occur naturally in the earth's crust, are known as __________.

Dry air was passed successively through a solution of 5 gm of a solute in 80 gm of water and then through pure water. The loss in weight of solution was 2.50 gm and that of pure solvent 0.04 gm . What is the molecular weight of the solute?

Which is the best technique to separate coffee grains from coffee solution?

What is the name of the clear liquid formed when a solid dissolves in a liquid?

N shell can have a maximum of _______ electrons.

State two reasons for supposing that brass is a mixture and not a compound.

In Celsius scale,300K is equivalent to X C.Value of X is

Element M forms a chloride with the formula MCl2 which is a solid with high melting point. What type of bond is in MCl2. Write the formula of the compound when M combines with sulphur, oxygen and nitrogen.

Which one of the following statements is not correct about the three states of matter i.e. solid, liquid and gaseous states?

All the gases form cathode rays and anode rays when electricity is passed through them: (i) What does the formation of cathode rays tell us about the atoms? (ii) What does the formation of anode rays tell us about the atoms?