11th Chemistry - Important Question's

Chapter 1 : Basic Concepts of Chemistry  :-

1.  Calculate mass in grams of  a)  An atom of Sulphur.  b)  A molecule of H2O

2.  What is Molarity and Molality . Differences between them  ?

3.  What is law of multiple proportion ? 

4.  Calculate the molecular formula of an oxide of Fe contain 69.9g and 30.1g of Fe and O respectively in percentage mass.  ( Molar mass of oxide = 159.8 g/mol and Fe = 55.85 ,   O = 16.00  )

5.  What Will be mass of 01 Mole NaCl and  02 Mole of H²O. 

6. Law of Definite Proportion.

Chapter 2:  Structure of Atom :-

1.  What is dual nature of substance ?  Establish De-Broglie equation. 

2.  What are four quantum numbers.  Explain. 

3.  What is emissions Spectra ? Write the Postulate of Bohr's Atomic Model .

4.  What is Pauli's Exclusion Principle . Write it's two Application .

5.   Explain Heisenberg  uncertainty Principle. 

Chapter 3 : Classification of Elements and Periodicity in Properties :-

1.  Why Electron Affinity of Be and Mg is Zero. 

2.  Explain why are cations smaller and anions larger in radii than their parent atoms. 

3.  What are Isoelectronic Species . Give Example

4.  Instead of having Similar electronic configuration Mg+ ion has a smaller Size than O²- ion.  Why.? 

5.  What is electronegativity  ? What is Periodicity of electron affinity and electronegativity in a group and series. 

6.  What are. a) Lanthanides.  b)  Amphoteric Oxides.  c) Ionisation Potential 

Chapter - 4: Chemical Bonding and Molecular Structure :-

1.  Explain  sp2 hybridization giving example . What is type of hybridisation in Ethylene.

2.  On Basis of Molecular Orbital theory draw the energy level diagram of N² and O² molecule,  also write Bond order and magnetic behaviour.  

3.  On Basis of MOT,  Explain why Be² molecule does not exist. 

4.  Explain Bond Length , Bond angle and Bond Enthalpy .

5.  Calculate No.  of Sigma and Pie Bonds in :  a)  C²H²   and.  B)  C2H4 .

6.  Compare Magnetic Behaviour of the following  :  O², O²- , O²+  .

Chapter - 5: State of Matter :-

Bu

1.  What is critical temperature. 

2.  The density of a gas is found to be 5.46 g/dm³ at 27°C and under 2 bar pressure. What will be it's density at STP ? 

3.  What are the condition of an ideal gas. 

5.   A) What is Boyle's law with its mathematical expression.  

    B)  What  is combined gas law ? Write it's mathematical form. 

6.  Establish the Gas Equation : 

      PV = RT .

7.  What is meant by intermolecular force ? They are of how many types.  Explain.

Chapter - 6 : Chemical Thermodynamics :-

1.  What is molar heat Capacity.  It's SI unit. 

2.  Explain Heat of combustion and write it's application. 

3.  What is Heat Capacity :

      Prove that:  Cp - Cv = R .

4.  What is free energy  ?  At Constant temperature and constant pressure prove that  : ∆G = ∆H - T∆S .

5.  What is first law of thermodynamics. Give it's mathematical expression.

6. Define the term  a) Adiabatic Process

    B) entropy. C) Isochoric Process ?

Chapter - 7 : Equilibrium :-

1.  What is meant by Lewis Acid and Lewis Base ? In H2O , BF3, H+, NH4+ which is Lewis acid .

2.  What is Lechateliers principle ? By the help of it, Explain the effect of temperature ,pressure And concentration on the following reaction

 N2 +3H2↔2NH3, ∆H= - 92Kcal.

3.   What is Commen ion effect ? Explain with Suitable example .

4.  Explain Conjugate acid and Conjugate Base .

5.  Explain the Bronsted- Lowry concept of Acid and Bases with Example .

Chapter - 8 : Redox Reaction :-

1.  Write the definition of oxidation and Reduction on the Basis of Oxidation number  .

2.  What are Oxidising agents and What are Reducing agents. 

3.  Discuss Disproportionate Reaction in brief . Why chlorine doesn't shows disproportionate reaction .

4. Write the factor affecting electrode potential.

5.  What is Nernst Equation ? Explain Relationship between E and E° .

6. What is standard hydrogen electrode ? How is it Used ? State the importance of E° .

Chapter - 9 : Hydrogen :-

1.  What is Heavy water  ? Write it's Uses .

2.   Write a Chemical Reaction to show the Amphoteric Nature of water. 

3.  Compare the structure of H2O and H2O2 .

4. Write the main uses of hydrogen.

5. Write name, formula and differences of isotopes of hydrogen .

Chapter - 10 : S - Block Elements :-

1.   What happens when  a)   Sodium metal Dropped in water.  b)  Sodium metal is heated in free Supply of air. 

2.  What happens when  a)  Quick Lime is heated with silica. 

    b)  Sodium Peroxide dissolves in water. 

3.  What are the Cause of Anomalous behaviour of Lithium.

4.  Describe. Two important uses of each of the following 

  I) Caustic Soda

  ii) Sodium Carbonate

  iii) Quick lime.

Chapter - 11 : P - Block Elements :-

1.  Why Borazine is known as Inorganic Benzene ?

2.  Explain the Diagonal relationship between boron and Silicon .

3.  Halides  of Boron ( BF3) Behaves as a Lewis acid . Why  ? Give Reason .

4.  Explain the following reactions :

   a) Silicon dioxide is treated with hydrogen fluoride .

   b) CO is heated with ZnO.

5. At Normal temperature H2O is Liquid and H2S is Gas . Why ?

Chapter 12 : Organic Chemistry - Basic Principles and Techniques : -

1.  What is the meaning of Hyperconjugation. ? Discuss .

2.  What is Inductive Effect , Explain it's type and Application .

3.  What are Electrophiles and nucleophiles ? Explain with Examples. 

4.  Draw the structure of  a)  2MethylPropanol

                                         b) Butanoic Acid

                                      c)  Cyclohexanol

Chapter - 13 : Hydrocarbons :-

1.  What is PVC  ? Write it's Use .

2.  What is Markownikoff's rule ? Give an example and Explain the mechanism .

3.  Draw the structure of following compound  

   a)  2,2 - dimethyl Butane. 

  b)  2 - chloro pentanoic acid 

  c)  1,3 - diamino propane .

4.  Why CycloPropane is more Reactive than cyclohexane .

5. Explain substitution reaction in alkane. 

6. What is Aromatisation ?

7. Explain hybridization in ethylene.

Chapter 14 :- Environmental Chemistry :-

1. What is biochemical oxygen demand ( B.O.D.)

2. What is greenhouse effect ? Name Greenhouse pollutant gases .

3. What is air pollution and its main sources ? What is smog ?

4. Write the measure to control soil pollution .

5. How ozone layer is depleted . Explain.