Chemistry Podcast

Thursday, 14 June 2018

General Organic Chemistry MCQs Part 20

General Organic Chemistry MCQs

MCQ-1.  The shortest C - C bond distance is found in :

MCQ-2.  Which of the following forces is strongest among the following ? :

  Dipole-dipole forces
  All equal
  Vander Waals forces

MCQ-3.  Which of the following free radicals is most stable ? :


MCQ-4.  Which of the following is an example of elimination reaction ? :

  Dehydration of ethanol
  Chlorination of methane
  Hydroxylation of ethylene
  Nitration of benzene

MCQ-5.  Acetaldehyde is the rearrangement product of :

  Vinyl alcohol
  Allyl alcohol
  Methyl alcohol
  All are correct

MCQ-6.  The least number of carbon atoms in alkane forming isomers is :


MCQ-7.  Diethyl ether is associated with which one of these isomers ? :

  Methyl propionate
  Butanoic acid

MCQ-8.  Number of primary and tertiary hydrogen atoms present neopentane are respectively :


MCQ-9.  Glucose and fructose are :

  Position isomers
  functional isomers
  optical isomers
  chain isomers

MCQ-10.  The least number of carbon atoms for an alkane to show stereoisomerism is :


Sunday, 10 June 2018

Science Quiz: Purification and analysis of organic compounds MCQ Part 19

Purification and analysis of organic compounds MCQ

These are some of the random multiple question answers from Purification and analysis of organic compounds...

1. Anthracene is purified by which method :


2.  A bottle containing two immiscible liquids. These liquids may be separated by using a :

  Separating funnel
  Vacuum distillation
  Fractionating coloumn
  Steam distillation

3.  When Lamery proposed his classifications of substances in the year 1675 the substance not know among the following was :

  Cane sugar

4.  In laboratory, first organic compound was synthesized by_________  :


5. A mixture of oil and water is separated by which method:

  Using separating funnel
  Fractional distillation

6. First organic compound to be synthesised was ________:

  Cane sugar
  Acetic acid

7.  Separation of two substance by fractional crytallisation depends upon their differences in the__________ :

  Crystalline shape

8. Impure naphthalene is purified by which method  :

  Fractional distillation
  Soxhlet extraction
  Fractional crystallization

9.  Which of the following not sublimate :

  Bebzoic acid

10. Aniline is purified by which method:

  Extraction with a solvent
  Vacuum distillation
  Simple distillation
  Steam distillation

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Saturday, 6 January 2018

Class 11 Chapter 6 - Thermodynamics

Class 11 Chapter 6: Thermodynamics


            A system is that part of universe in which we made observations is called system.


            All remaining part of the universe, other than system is called surroundings.
Universe = System + Surroundings

Types of System:

            The system is classified on the basis of movement of energy and matter inside or outside the system. I.e. open system, closed system and isolated system.

     1.     Open System:

A system in which exchange of matter and energy between the system and surroundings take place, is called open system.
Example:- Reaction in open beaker.

     2.     Closed System:

A system in which exchange of energy between the system and surroundings take place but there is no exchange of matter between the system and surroundings takes place, is called closed system.
Example:- Reaction in closed conducting vessel of steel.

     3.     Isolated System:

A system, in which no exchange of matter and energy between the system and surroundings take place, is called isolated system.
Example:- Reaction in isolated vessel like thermos flask.

The state of the system

            In chemistry, the state of thermodynamic system is described by the measurable or macroscopic i.e. bulk properties of the thermodynamic system.
To learn better, if someone asks, how we can describe the state of a gas?
So to answer this question, we describe the state of a gas by getting information about pressure (p), volume (V), temperature (T) and amount (n) etc. of gas.
So, these variables i.e. p, V, T are known as state variables or state functions.
Why these variables (p, V, T) are called state variables or state functions?
These variables are called state variables or state functions because their values depends only on the state of the system and do not depend on how they are reached on that point.

Internal Energy

            Sum of all energies (like chemical, electrical, mechanical etc.) of the system is called internal energy (U) of the system.
Now question is when internal energy of the system changes?
Internal energy of the system changes when,
·        Heat passes into or heat passes out of the system.
·        Work is done on the system or work is done by the system.
·        Matter enters the system or matter leaves the system.

     i.       Work

Before learning about effect of work on internal energy we first understand what is Adiabatic system.

Adiabatic system

            Adiabatic system is a system which does not allow transfer of heat through its boundary; means heat can not enters or leave the system.

Work on adiabatic system

            If 1kJ mechanical work done (case 1) on the system and 1kJ electrical work done (case 2) on the system than change in temperature is same in bath cases.
So, amount of work done on the system produces the same change of state no matter how this work was done.
            U = U2 – U1 = Wad
            U = internal energy
            U2 = internal energy at state 2 (final state)
U1 = internal energy at state 1 (initial state)
Wad = adiabatic work
Sign of Wad
a.     If Wad is positive, then work is done on the system.
b.     If Wad is negative, then work is done by the system.

      ii.     Heat

What is heat?

The exchange of energy due to difference in temperature is called heat.

If system allows exchange of heat (conducting walls of the system) then change in internal energy depends on amount of heat transfer between system and surroundings at constant volume when no work is done.
            U = q
            U = internal energy
            q = heat
            Sign of q
a.     q is positive, if heat is transferred from the surroundings to the system.
b.     q is negative, if heat is transferred from the system to surroundings.

Sunday, 17 September 2017

Structure of Atom Class 11 MCQ

Structure of Atom MCQ

Structure of Atom Chemistry Question Answers
These are some of the random multiple question answers from Structure of Atom... 

1. Who discovered anode rays :

 J. Stanley
 J. J. Thomson

2. Neutron was discovered by :


3. Radioactive isotope of hydrogen has ________ number of neutrons :


4. Cathode rays are deflected by :

 A magnetic field only
 An electric field only
 By Both
 By None

5. Cathode rays have :

 Mass Only
 Charge Only
 Mass and Charge Both
 No Charge and No Mass

6. Mass of atom is mainly constituted by :

 Neutrons and neutrino
 Neutrons and electrons
 Neutrons and protons
 Protons and electrons

7. Ratio of mass of proton and electron is :

 None of these

8. Atomic number of an element is equal to the number of  :

 Electron and Proton

9. Size of nucleus is :

 10-8 m
 10-10 m
 10-12 m
10-15 m

10. Who modifies Bohr’s model :


Also read Chemistry Notes of this chapter at below link...
11 Class Chapter 2- Structure of Atom

Friday, 15 September 2017

Some Basic Concepts of Chemistry Class 11 MCQ

Some Basic Concepts of Chemistry Class 11 MCQ

some basic concepts of chemistry mcq

These are some of the random multiple question answers from Some Basic Concept of Chemistry...

1. If a matter has definite volume and definite shape, then it is :

All of the Above

2. Mole is SI unit of :

Amount of Substance
Luminous intensity

3. A measured temperature is 100 0F on Fahrenheit scale, then what is this reading be on Celsius scale :

11.2 0C

78 0C

102.7 0C

37.8 0C

4. What amount of H­2O produced by combustion of 32 g of CH4 :

36 g
18 g
72 g
90 g

5. How many moles of CH4 is needed to get 44 gram CO2 after combustion :

0.5 mol of Methane
1 mol of Methane
2 mol of Methane
4 mol of Methane

6. Calculate the mass per cent of the solute, when a solution is prepared by adding 4 gram of substance A to 36 gram of water :


7. What is molarity of  NaOH in the Solution, that is prepared by adding 2 gram NaOH in water to get 500 mL of the solution :

0.4 M
1.0 M
0.1 M
4.0 M

8. A measured temperature is 44 0C on Celsius scale, then what is this reading be on Fahrenheit scale :

111.2 0F

88.8 0F

32 0F

199.8 0F

9. Dalton in 1803, gives :

Law of conservation of mass

Law of definite proportion

Law of multiple proportion

Gay Lussac’s law of gaseous volume

10. The prefix 10-15 is :


View below video on Some Basic Concept of Chemistry Quiz

Also read Chemistry Notes of this chapter at below link...

11 Class Chapter 1- Some Basic Concept of Chemistry Notes


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