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Hydrogen and its compounds MCQs Part 21

Hydrogen And Its Compounds MCQ

MCQ-1.  Hydrogen from HCI can be prepared from :

  P
  Mg
  Hg
  Cu


MCQ-2.  Commercial hydrogen is obtained from :

  Producer gas
  Marsh gas
  Oil gas
  Coal gas


MCQ-3.  Oxygen is used to purify water since it :

  absorbs harmful UV radiations
  is reducing
  is paramagentic
  destroys viruses and bacteria


MCQ-4.  How many neutrons are there in protium ? :

  3
  1
  2
  0


MCQ-5.  Which of the following is more stable ? :

  Para hydrogen
  Both are equal
  Can not be said
  Ortho hydrogen


MCQ-6.  Which one is not an isotope of hydrogen ? :

  Ortho hydrogen
  Deuterium
  Tritium
  None of the above


MCQ-7.  Pure water can be obtained from sea water by :

  Reverse osmosis
  Plasmolysis
  Sedimentation
  Centrifugation


MCQ-8.  Which one of the following metals will not reduce water? :

  Fe
  Cu
  Li
  Ca


MCQ-9.  The maximum possible number of hydrogen bonds a water molecule can from is :

  3
  2
  4
  1


MCQ-10.  In the structure of ice , each oxygen atom is surrounded by four other oxygen atoms :

  Octahedrally
  In a square planar manner
  Tetrahedrally
  None of the above


MCQ-11.  The alum used for purifying water is :

  Chrome alum
  Ammonium alum
  Ferric alum
  Potash alum


MCQ-12.  The process used for the removal of hardness of water is :

  Serpeck
  Hoope
  Calgon
  Baeyer


MCQ-13.  The exhausted permutit is generally regenerated by percolating through it a solution of :

  Calcium chloride
  Magnesium chloride
  Potassium chloride
  Sodium chloride


MCQ-14.  When sulphur trioxide is heated with heavey water the products are :

  Deuterium sulphuric acid
  Deuterium and sulphuric acid
  Deutero-sulphuric acid
  None of the above


MCQ-15.  Heavy water is used as :

  Detergent
  Drinking water
  A moderator
  Washing water


MCQ-16.  An aqueous solution of hydrogen peroxide is :

  Neutral
  Weakly acidic
  Strongly acidic
  Alkaline


MCQ-17.  Hydrogen peroxide is used as :

  An acid only
  An oxidant only
  A reductant only
  An oxidant , a reductant and an acid


MCQ-18.  The Low density of ice compared to water is due to :

  Dipole- dipole interactions
  Induced dipole- induced dipole interactions
  Hydrogen bonding interactions
  Dipole - induced dipole interactions


MCQ-19.  Which can't displace hydrogen from the compounds ? :

  Zn
  Fe
  Hg
  None of the above


MCQ-20.  The property of hydrogen which distinguishes it from alkali metals is :

  Its affinity for non-metals
  Its non-metallic character
  Its electropositive character
  Its reducing character

General Organic Chemistry MCQs Part 20

General Organic Chemistry MCQs

MCQ-1.  The shortest C - C bond distance is found in :
  Ethane
  Benzene
  Diamond
  Acetylene


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

  Dipole-dipole forces
  H-Bonding
  All equal
  Vander Waals forces


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

  Methyl
  Secondary
  Tertiary
  Primary


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 :

  3
  1
  4
  2


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

  Steroisomerism
  Methyl propionate
  Butanoic acid
  None


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

  6,6
  12,0
  9,3
  5,7


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 :

  5
  3
  2
  4

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 :

  Distillation
  Sublimation
  Filtration
  Crystallisation



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 :

  Wine
  Iron
  Cane sugar
  Penicillin



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

  Hennel
  Wohler
  Liebig
  Kekule



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

  Sublimation
  Filtration
  Using separating funnel
  Fractional distillation



6. First organic compound to be synthesised was ________:

  Cane sugar
  Acetic acid
  Urea
  Methane



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

  Crystalline shape
  Solubility
  Volatility
  Densities

8. Impure naphthalene is purified by which method  :

  Sublimation
  Fractional distillation
  Soxhlet extraction
  Fractional crystallization

9.  Which of the following not sublimate :

  Chlorine
  Bebzoic acid
  Camphor
  Naphthalene

10. Aniline is purified by which method:

  Extraction with a solvent
  Vacuum distillation
  Simple distillation
  Steam distillation






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Class 11 Chapter 6 - Thermodynamics

Class 11 Chapter 6: Thermodynamics

System:

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

Surroundings:

            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.
So,
            U = U2 – U1 = Wad
Where,
            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.
So,
            U = q
Where,
            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.



Heat and Temperature

What is Heat?

The exchange of energy due to difference in temperature is called heat. But as a noun we can say that the Heat is the quality of being hot or high temperature and to understand easily we can say that feeling of hot or warm is heat.

Heat

The exchange of energy due to difference in temperature is called heat. We may also explain as, heat is the form of the energy that is moved between two substances at different temperatures. Means if two substances are in contact and one has 200K temperature and other have 100K temperature then the direction of energy flow is from the substance at the higher temperature to the substance of lower temperature. Means in above case heat flows from substance having 200k temperature to substance having 100K temperature.
Heat is a form of energy so heat is measured in units of energy, commonly calories or joules.

What is Temperature?

Temperature is the quantity of hotness or coldness of any substance. Simply we can say that Temperature is the measurement of how much an object is hot or cold.

Temperature

Temperature is the quantity of hotness or coldness. Also in scientific way, temperature is explained as the average kinetic energy per molecule of a substance. Heat and Temperature (Temp, T) are two different terms and have different meanings so don’t get confuse between them.  Heat is energy while temperature is not energy. Heat is measured in Joules while temperature is measured in Celsius (C), Fahrenheit (F) or Kelvin (K). Symbol used for heat is Q while symbol used for temperature is T. SI unit of heat is Joule while SI unit of temperature is Kelvin.

Heat VS Temperature

Heat is the flow of energy from hot object to cold object while temperature is the measurement of how much an object is hot or cold. Heat is energy while temperature is not energy. Heat is measured in Joules while temperature is measured in Celsius (C), Fahrenheit (F) or Kelvin (K). Symbol used for heat is Q while symbol used for temperature is T. SI unit of heat is Joule while SI unit of temperature is Kelvin.


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 :

 Goldstein
 Rutherford
 J. Stanley
 J. J. Thomson


2. Neutron was discovered by :

 Rutherford
 Chadwick
 Austin
 Langmuir


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

 0
 1
 2
 3


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 :

 1.8
 1.8x103
 Infinite
 None of these


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

 Proton
 Electron
 Neutron
 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 :

 Dalton
 Pauli
 Rutherford
 Sommerfeld




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

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 :

Solid
Liquid
Gas
All of the Above


2. Mole is SI unit of :

Current
Temperature
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 :

10%
20%
30%
40%


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 :

Atto
Femto
Peta
Tera


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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