Chemistry Long Questions Guess Paper 11th Class 2017
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Frequently Asked Questions (2012 to 2016)
Chemistry Long Questions Variations
Describe one method to determine the boiling point elevation of a solution. OR Give graphical explanation for elevation of boiling point of a solution. OR What is boiling point? What is the effect of external pressure on boiling point? Why the temperature of a liquid remains constant at boiling point although heat is continuously supplied?
Discuss magnetic and spin quantum numbers.
Explain important points of molecular orbital theory and draw structure of nitrogen (N2) molecule according to this theory. OR Define orbital. Discuss shape of its two types. OR Explain the molecular orbital structures of following molecules on the basis of the MOT: (i) N2 (Nitrogen) (ii) 02 (Oxygen). OR Define atomic orbital hybridization with reference to Sp3, Sp2 and Sp modes of hybridizations for pH3, C2H and C2H. OR Describe the bonding in 01 according to molecular orbital theory and explain its paramagnetic property.
Define the following with example (i) System. (ii) Non-spontaneous reactions. (iii) Surrounding. (iv) Endothermic reactions.
Explain the construction and working of fuel cell.
What is electrochemical series? Give its applications.
What are buffer solution? Why do we need them in daily life.
What are azeotropic mixtures? Explain them with the help of graphs.
Write a detailed note on activation energy. Explain with graphs.
Define and explain Hess’s law and give its applications. OR Define and explain Hess’s law of constant heat summation with examples.
Write down the steps to calculate empirical formula.
What is stoichiometry? Give its assumptions. Mention two important laws, which help to perform the stoichiometric calculations.
Describe the freezing point depression method for the determination of molecular mass of an organic compound. OR How depression in freezing point is measured uy Beckmann’s apparatus?
What is mass spectrometer? How is it used to determine the relative atomic masses of isotopes?
Write down the main postulates of VSEPR theory and discuss the structure of NH3 with reference of this theory. OR Discuss with two suitable examples VSEPR theory of covalent bond.
State the construction and functioning of glass calorimeter.
Outline the important industrial applications of electrolysis. OR Describe the electrolysis of molten NaCt and aqueous solution of NaCt.
What are enzymes? Give examples in which they act as catalyst. Mention the characteristics of enzymes.
Write four characteristics of a catalyst.
How volume and pressure were corrected by Vander Waals?
What is H-Bonding? Discuss H-Bonding in biological compounds.
An ideal gas is enclosed in a container having volume 500 cm3 at S.T.P. Its mass comes out to be 0.72 g. What is the molar mass of this gas? OR What is mole fraction in solutions? Compare molar and molar solutions. OR What is molar heat of combustion? How it is measured by bomb calorimeter? OR 250 cm3 of the sample of hydrogen effuses four times as rapidly as 250 cm3 of an unknown gas. Calculate the molar mass of an unknown gas. OR Calculate the pH of a buffer solution in which 0.11 molar CH3COONa and 0.09 molar acetic acid solutions are present Ka for CH3COOH is 1.85 x 10-5.
State first law of thermodynamics. Prove that AE = q
Explain demonstration of Graham’s law.
Describe Dalton’s law of partial pressure. Write its three applications. OR Explain Dalton’s law of partial pressure and give its applications in breathing process.
Describe Millikan’s Oil Drop Method for the measurement of charge on electron.
Define electrode potential. Describe the construction of voltaic cell and reaction occurring in the cell. OR Explain the term: (i) half life period (ii) order of reaction. OR Write the electrochemical reactions involved therein. OR N2 (g) , and H2 (g) combine to give NH3 (g). The value of Kc in this reaction is 6.0 x 10-2. Calculate the value of Kp for this reaction. OR How rate of reaction depends upon the following factors (i) Nature of reactants (ii) Surface area.
What are liquid crystals? Give three uses in daily life.
What is hybridization? Discuss sp2 hybridization with example. OR Explain structure of CH on the basis of hybridization theory.
Write down the properties of cathode rays. OR What are cathode rays? How these rays are produced? OR How are positive rays produced in discharge tube? Give properties of these rays.
Explain paramagnetic behaviour of 02 on the basis of MOT and prove MOT is superior to other theories.
Define vapour pressure and give a method for its measurement.
What is an ideal gas? Real gases deviate more from ideal behavior at low temperature and under high pressure. Explain. OR What is the general gas equation? Derive it in various forms?
Write a note on fuel cells.
Define the following germs: (i) Transition temperature (ii) Allotropy (iii) Isomorphism (iv) Polymorphism.
Describe the construction and the working of standard hydrogen electrode. OR What is standard hydrogen electrode (SHE)? How it is used to measure the electrode potential of zinc?
Give three statements of Raoult’s law and also mention how Raoult’s law helps in determining the ideality of a solution. OR Explain Raoult’s law when both components in the solution. OR State and explain Raoult’s law in three forms.
How does the Arrhenius equation help us to calculate the energy of activation of a reaction?
What are ionic solids? Give their properties in detail. OR What are molecular solids? Write their properties. OR What are molecular solids? Give examples and explain their properties.
Calculate the number of grams of At2S3 which can be prepared by the reaction of 20g of At and 30g of sulphur. How much the notaimiting reactant is in excess?
What is crystallization? Explain all steps of crystallization.
A mixture of two liquids, hydrazine, N2H and N20 are used in rockets. They produce N2 and water vapours. How many grams of N2 gas will be formed by reacting 100g of N2H and 200g of N20.
Define electron affinity. Name the factors affecting it. How does it vary in the periodic table?
Where is plasma found? Write few applications of plasma.
Define enthalpy of reaction. How is it measured by glass calorimeter? OR Define enthalpy of neutralization. Also discuss glass calorimeter in detail.
Describe Lind’s method for the liquefaction of gases.
Describe the electrolysis of molten sodium chloride and a concentrated solution of sodium chloride.