7248 + Interview Questions in Chemistry Page 52 InterviewSolution

2551.	A tank is filled with a liquid upto a height H. A small hole is made at the bottom of this tank. Consider t1 be the time taken to empty first half of the tank and t2 be the time taken to empty rest half of the tank. Then, determine the ratio t1/t2?
Answer» A tank is filled with a liquid upto a height H. A small hole is made at the bottom of this tank. Consider t1 be the time taken to empty first half of the tank and t2 be the time taken to empty rest half of the tank. Then, determine the ratio t1/t2?

Discussion

2552.	Ozone in stratosphere is depleted by:
Answer» Ozone in stratosphere is depleted by:

Discussion

2553.	The valency of aluminium is 3. Write the valency of their radicals present in the following compounds. (a) Aluminium chloride (b) Aluminium oxide (c) Aluminium nitride (d) Aluminium sulphate
Answer» The valency of aluminium is 3. Write the valency of their radicals present in the following compounds. (a) Aluminium chloride (b) Aluminium oxide (c) Aluminium nitride (d) Aluminium sulphate

2553.

The valency of aluminium is 3. Write the valency of their radicals present in the following compounds. (a) Aluminium chloride (b) Aluminium oxide (c) Aluminium nitride (d) Aluminium sulphate

Answer»

The valency of aluminium is 3. Write the valency of their radicals present in the following compounds.

(a) Aluminium chloride

(b) Aluminium oxide

(c) Aluminium nitride

(d) Aluminium sulphate

Discussion

2554.	which of the following reaction is said to be entropy driven 1. endothermic reaction with positive entropy change and high temperature. 2. endothermic reaction with negative entropy change and low temperature. 3. exothermic reaction with positive entropy change and high temperature.4. exothermic reaction with negative entropy change and low themperatur
Answer» which of the following reaction is said to be entropy driven 1. endothermic reaction with positive entropy change and high temperature. 2. endothermic reaction with negative entropy change and low temperature. 3. exothermic reaction with positive entropy change and high temperature.4. exothermic reaction with negative entropy change and low themperatur

Discussion

2555.	The following diagram shows the various shells of electrons. The maximum number of electrons that can be accomodated in L shell is ________ .
Answer» The following diagram shows the various shells of electrons. The maximum number of electrons that can be accomodated in L shell is ________ .

2555.

The following diagram shows the various shells of electrons. The maximum number of electrons that can be accomodated in L shell is ________ .

Answer»

The following diagram shows the various shells of electrons. The maximum number of electrons that can be accomodated in L shell is ________ .

Discussion

2556.	The Taj Mahal is threatened by pollution from
Answer» The Taj Mahal is threatened by pollution from

Discussion

2557.	why according to acidic strength H_3P_{}O_2>H_3PO_3>H_3PO_4?
Answer» why according to acidic strength H_3P_{}O_2>H_3PO_3>H_3PO_4?

Discussion

2558.	Homogeneous solution can be separated only by utilising the components' ___
Answer» Homogeneous solution can be separated only by utilising the components' ___

Discussion

2559.	What is 'greenhouse effect'? State its importantce for us.
Answer» What is 'greenhouse effect'? State its importantce for us.

Discussion

2560.	In which of the following the valency of each of the constituent elements is equal to the total number of atoms in one molecule of the compound?
Answer» In which of the following the valency of each of the constituent elements is equal to the total number of atoms in one molecule of the compound?

Discussion

2561.	How do matchsticks work? Explain the compounds used and their function.
Answer» How do matchsticks work? Explain the compounds used and their function.

Discussion

2562.	Name three crystalline substances.
Answer» Name three crystalline substances.

Discussion

2563.	What happens when dilute hydrochloric acid reacts with magnessium ribbon?
Answer» What happens when dilute hydrochloric acid reacts with magnessium ribbon?

Discussion

2564.	Flames of the mixtures _________ and _________ are used for welding.
Answer» Flames of the mixtures _________ and _________ are used for welding.

Discussion

2565.	Fill appropriate terms in the blanks .( white cement , soap, detergent , wearing of bones, tooth decay, hard, soft, Portland, fatty acid )(a) The substance that helps water to remove dirt from the surface of materials is called ............... .(b) Fluoride is used in toothpaste to prevent ................ .(c) Soap is a salt of ............... and sodium hydroxide.(d) Synthetic detergents can be used in .............. water as well .(e) For construction purposes ............... cement is the most commonly used cement.
Answer» Fill appropriate terms in the blanks . ( white cement , soap, detergent , wearing of bones, tooth decay, hard, soft, Portland, fatty acid ) (a) The substance that helps water to remove dirt from the surface of materials is called ............... . (b) Fluoride is used in toothpaste to prevent ................ . (c) Soap is a salt of ............... and sodium hydroxide. (d) Synthetic detergents can be used in .............. water as well . (e) For construction purposes ............... cement is the most commonly used cement.

Discussion

2566.	What happens when we increase the temperature of reaction system?
Answer» What happens when we increase the temperature of reaction system?

Discussion

2567.	Question 36Which one of the following figures correctly describes the process of electrolytic refining?
Answer» Question 36 Which one of the following figures correctly describes the process of electrolytic refining?

Discussion

2568.	The gravitational field in a region is given by ¯E=(10N/kg)(¯i+¯j). The work done by an external agent to slowly shift a particle of mass 2 kg from the point (0,0) to a point (5 m, 4 m) is..
Answer» The gravitational field in a region is given by $¯ E = (10 N / k g) (¯ i + ¯ j)$ . The work done by an external agent to slowly shift a particle of mass 2 kg from the point (0,0) to a point (5 m, 4 m) is..

Discussion

2569.	What do we understand by calorific power?
Answer» What do we understand by calorific power?

Discussion

2570.	What are solutions?
Answer» What are solutions?

Discussion

2571.	The number of elements present in a water molecule are ______.
Answer» The number of elements present in a water molecule are ______.

Discussion

2572.	Select the combustible substance:
Answer» Select the combustible substance:

Discussion

2573.	89 Give the reactions of calcium and magnesium with nitric acid.
Answer» 89 Give the reactions of calcium and magnesium with nitric acid.

Discussion

2574.	ntIn a ccp structure of a compound XY, atom X is present at octahedral voids . The ratio of 6th C.N. and 3rd C.N. for an atom X located at body centre isn
Answer» ntIn a ccp structure of a compound XY, atom X is present at octahedral voids . The ratio of 6th C.N. and 3rd C.N. for an atom X located at body centre isn

Discussion

2575.	A Mars Rover discovered an element X. On analysis using Bohr’s atomic model, it was found that K and L shells of the given element were completely filled, whereas ten more electrons were required to fill the M shell. Calculate the atomic number of element 'X'.
Answer» A Mars Rover discovered an element X. On analysis using Bohr’s atomic model, it was found that K and L shells of the given element were completely filled, whereas ten more electrons were required to fill the M shell. Calculate the atomic number of element 'X'.

Discussion

2576.	Does liquid nitrogen conduct electricity?
Answer» Does liquid nitrogen conduct electricity?

Discussion

2577.	Alkali metals dissolve in liquid NH3 to give deep blue coloured solutions which are paramagnetic in nature. This on standing turns brown.This brown colour is due to __________ and it turns diamagnetic due to________.
Answer» Alkali metals dissolve in liquid NH3 to give deep blue coloured solutions which are paramagnetic in nature. This on standing turns brown.This brown colour is due to __________ and it turns diamagnetic due to________.

Discussion

2578.	Which of the following is not a physical property of metals?
Answer» Which of the following is not a physical property of metals?

Discussion

2579.

Match the following energies with their corresponding causes. Column I Column II a. Wind movements x. Solar radiation b. Ocean thermal energy y. Tidal energy c. The Moon's gravity z. Wave energy

Answer»

Match the following energies with their corresponding causes.

Column I
Column II

$a .$ Wind movements	$x .$ Solar radiation
$b .$ Ocean thermal energy	$y .$ Tidal energy
$c .$ The Moon's gravity	$z .$ Wave energy

Discussion

2580.	Which of the following is used to extinguish fire caused due to oil?
Answer» Which of the following is used to extinguish fire caused due to oil?

Discussion

2581.	Hydrogen is prepared by the ___ of water using platinum electrode.
Answer» Hydrogen is prepared by the ___ of water using platinum electrode.

Discussion

2582.	The folowing table shows the distance travelled by one of the new eco-friendly energy efficient car travelled on gas.Which type of properties are indicated by the table? How much distance will be covered by the car in 8 liters of gas?
Answer» The folowing table shows the distance travelled by one of the new eco-friendly energy efficient car travelled on gas. Which type of properties are indicated by the table? How much distance will be covered by the car in 8 liters of gas?

2582.

The folowing table shows the distance travelled by one of the new eco-friendly energy efficient car travelled on gas.Which type of properties are indicated by the table? How much distance will be covered by the car in 8 liters of gas?

Answer»

The folowing table shows the distance travelled by one of the new eco-friendly energy efficient car travelled on gas.

Which type of properties are indicated by the table? How much distance will be covered by the car in 8 liters of gas?

Discussion

2583.	Find The total mass of 1 mole of electrons is?
Answer» Find The total mass of 1 mole of electrons is?

Discussion

2584.	A gaseous mixture contains equal masses of O2 and CH4 . If the total pressure of the mixture is 15 atm then the partial pressure of methane in the mixture is
Answer» A gaseous mixture contains equal masses of $O_{2}$ and $C H_{4}$ . If the total pressure of the mixture is 15 atm then the partial pressure of methane in the mixture is

Discussion

2585.	The ..............group in a soap molecule is hydrophilic. __
Answer» The ..............group in a soap molecule is hydrophilic. __

Discussion

2586.	Reactivity order of metals. With their names and formulas
Answer» Reactivity order of metals. With their names and formulas

Discussion

2587.	Question 1Air is a mixture of various gases. One of the gases constitutes 21% part of the air and is essential for the survival of human beings. This gas is:(a) Nitrogen(b) Oxygen(c) Ozone(d) Argon
Answer» Question 1 Air is a mixture of various gases. One of the gases constitutes 21% part of the air and is essential for the survival of human beings. This gas is: (a) Nitrogen (b) Oxygen (c) Ozone (d) Argon

Discussion

2588.	Why don't we use petrol instead of coal in thermal power plants though petrol has higher calorific value and can produce more energy?
Answer» Why don't we use petrol instead of coal in thermal power plants though petrol has higher calorific value and can produce more energy?

Discussion

2589.	A ball is thrown from the top of a building. As it approaches the ground which of the following energy decreases?
Answer» A ball is thrown from the top of a building. As it approaches the ground which of the following energy decreases?

Discussion

2590.	Compare the properties of metals and non-metals with respect to :(i) malleability (ii) ductility, and (iii) conduction of heat and electricity.
Answer» Compare the properties of metals and non-metals with respect to :(i) malleability (ii) ductility, and (iii) conduction of heat and electricity.

Discussion

2591.	are all reactions either endothermic or exothermic. isn't any reaction neither endothermic nor exothermic
Answer» are all reactions either endothermic or exothermic. isn't any reaction neither endothermic nor exothermic

Discussion

2592.	If reduction and oxidisation occur in the same reaction, then what should it be called? A redox or oxidised reaction?
Answer» If reduction and oxidisation occur in the same reaction, then what should it be called? A redox or oxidised reaction?

Discussion

2593.	How to find whether a reaction is Markovnikov's Addition or Anti Markovnikov's Addition?
Answer» How to find whether a reaction is Markovnikov's Addition or Anti Markovnikov's Addition?

Discussion

2594.	Two reactions proceed at 25°C at the same rate. The temperature coefficients of the first reaction is 2 and that if second is 2.5, find the ratio of the rates of second reaction to first at 95°C
Answer» Two reactions proceed at 25°C at the same rate. The temperature coefficients of the first reaction is 2 and that if second is 2.5, find the ratio of the rates of second reaction to first at 95°C

Discussion

2595.	Atomic number of chlorine is 17. How many electrons are present in the M shell of a chlorine atom?
Answer» Atomic number of chlorine is 17. How many electrons are present in the M shell of a chlorine atom?

Discussion

2596.	Explain how CO2 is able to control fires.
Answer» Explain how CO2 is able to control fires.

Discussion

2597.	Which of the following particles causes coughing and respiratory irritation?
Answer» Which of the following particles causes coughing and respiratory irritation?

Discussion

2598.	Explain the following sentences.a. Energy obtained from fossil fuels is not green energy.b. Saving energy is the need of the hour.
Answer» Explain the following sentences. a. Energy obtained from fossil fuels is not green energy. b. Saving energy is the need of the hour.

Discussion

2599.	If put a diamond In an volcano what is the reaction
Answer» If put a diamond In an volcano what is the reaction

Discussion

2600.	Select the mode used for transportation of natural gas.
Answer» Select the mode used for transportation of natural gas.

Discussion

Explore topic-wise InterviewSolutions in .

A tank is filled with a liquid upto a height H. A small hole is made at the bottom of this tank. Consider t1​ be the time taken to empty first half of the tank and t2​ be the time taken to empty rest half of the tank. Then, determine the ratio t1/t2​​?

Ozone in stratosphere is depleted by:

The valency of aluminium is 3. Write the valency of their radicals present in the following compounds. (a) Aluminium chloride (b) Aluminium oxide (c) Aluminium nitride (d) Aluminium sulphate

The following diagram shows the various shells of electrons. The maximum number of electrons that can be accomodated in L shell is ________ .

The Taj Mahal is threatened by pollution from

why according to acidic strength H_3P_{}O_2>H_3PO_3>H_3PO_4?

Homogeneous solution can be separated only by utilising the components' ___

What is 'greenhouse effect'? State its importantce for us.

In which of the following the valency of each of the constituent elements is equal to the total number of atoms in one molecule of the compound?

How do matchsticks work? Explain the compounds used and their function.

Name three crystalline substances.

What happens when dilute hydrochloric acid reacts with magnessium ribbon?

Flames of the mixtures _________ and _________ are used for welding.

What happens when we increase the temperature of reaction system?

Question 36Which one of the following figures correctly describes the process of electrolytic refining?

The gravitational field in a region is given by ¯E=(10N/kg)(¯i+¯j). The work done by an external agent to slowly shift a particle of mass 2 kg from the point (0,0) to a point (5 m, 4 m) is..

What do we understand by calorific power?

What are solutions?

The number of elements present in a water molecule are ______.

Select the combustible substance:

89 Give the reactions of calcium and magnesium with nitric acid.

ntIn a ccp structure of a compound XY, atom X is present at octahedral voids . The ratio of 6th C.N. and 3rd C.N. for an atom X located at body centre isn

A Mars Rover discovered an element X. On analysis using Bohr’s atomic model, it was found that K and L shells of the given element were completely filled, whereas ten more electrons were required to fill the M shell. Calculate the atomic number of element 'X'.

Does liquid nitrogen conduct electricity?

Alkali metals dissolve in liquid NH3 to give deep blue coloured solutions which are paramagnetic in nature. This on standing turns brown.This brown colour is due to __________ and it turns diamagnetic due to________.

Which of the following is not a physical property of metals?

Match the following energies with their corresponding causes. Column I Column II a. Wind movements x. Solar radiation b. Ocean thermal energy y. Tidal energy c. The Moon's gravity z. Wave energy

Which of the following is used to extinguish fire caused due to oil?

Hydrogen is prepared by the ___ of water using platinum electrode.

The folowing table shows the distance travelled by one of the new eco-friendly energy efficient car travelled on gas.Which type of properties are indicated by the table? How much distance will be covered by the car in 8 liters of gas?

Find The total mass of 1 mole of electrons is?

A gaseous mixture contains equal masses of O2 and CH4 . If the total pressure of the mixture is 15 atm then the partial pressure of methane in the mixture is

The ..............group in a soap molecule is hydrophilic. __

Reactivity order of metals. With their names and formulas

Question 1Air is a mixture of various gases. One of the gases constitutes 21% part of the air and is essential for the survival of human beings. This gas is:(a) Nitrogen(b) Oxygen(c) Ozone(d) Argon

Why don't we use petrol instead of coal in thermal power plants though petrol has higher calorific value and can produce more energy?

A ball is thrown from the top of a building. As it approaches the ground which of the following energy decreases?

Compare the properties of metals and non-metals with respect to :(i) malleability (ii) ductility, and (iii) conduction of heat and electricity.

are all reactions either endothermic or exothermic. isn't any reaction neither endothermic nor exothermic

If reduction and oxidisation occur in the same reaction, then what should it be called? A redox or oxidised reaction?

How to find whether a reaction is Markovnikov's Addition or Anti Markovnikov's Addition?

Two reactions proceed at 25°C at the same rate. The temperature coefficients of the first reaction is 2 and that if second is 2.5, find the ratio of the rates of second reaction to first at 95°C

Atomic number of chlorine is 17. How many electrons are present in the M shell of a chlorine atom?

Explain how CO2 is able to control fires.

Which of the following particles causes coughing and respiratory irritation?

Explain the following sentences.a. Energy obtained from fossil fuels is not green energy.b. Saving energy is the need of the hour.

If put a diamond In an volcano what is the reaction

Select the mode used for transportation of natural gas.

A tank is filled with a liquid upto a height H. A small hole is made at the bottom of this tank. Consider t1 be the time taken to empty first half of the tank and t2 be the time taken to empty rest half of the tank. Then, determine the ratio t1/t2?

Flames of the mixtures _ and _ are used for welding.

Alkali metals dissolve in liquid NH3 to give deep blue coloured solutions which are paramagnetic in nature. This on standing turns brown.This brown colour is due to __ and it turns diamagnetic due to.