Category Archives: CHEMSITRY

HOW TO SCORE MAXIMUM MARKS FROM PRACTICAL PART IN THEORY PAPER-CHEMISTRY

Dear students ,
I think you might have finished your practical examinations by this time successfully.Theory paper also contains questions from practical part for ten marks. no one should loose marks in this part . To score ten marks in part d-2, first get ready to answer two questions. you can be selective . this part has three questions of five marks each out of which you have to answer two questions.
therefore you must read
1) both the preparations (3M)
2) test for carbohydrates and proteins (2M)
3) all the three titrations (5M)
another question will be from kinetics experiments – that you can leave.
scoring marks in practical is easier than theory. five page reading in practical procedure gets a definite 10 marks in final examination theory paper (part d-2). so don’t loose marks in this part.

II PUC CHEMISTRY IMPORTANT QUESTIONS.

ii-puc-chemistry-impquestions1

MODEL QUESTION PAPER -CHEMISTRY-I PUC

i-puc-chemistry-qp

chapterwise important questions in chemistry-IPUC

I – P U C – CHEMISTRY

IMPORTANT QUESTIONS ON EACH TOPIC

I. METALLURGY; (4H—6M)

1. What is an ore? 1M

2. How is ore concentrated by a)gravity process b) Forth flotation process c)Magnetic separation.—–2M

3. How is zinc extracted from zinc blende?—4M(very imp)

4. How is gold extracted by cyanide process?—4M(very imp)

5. with a neat labeled diagram explain etraction of Mg from sea water.—-4M(very imp)

6Explain a) zone refining.—2M

II. ATOMIC STRUCTURE;(6H—–9M)

  1. Explain the formation of spectral lines in hydrogen spectrum on the bases of Bohrs theory.—4M
  2. State a)Paulis exclusion principle. b)Hunds rule c) (n+l) rule –2M(very imp)
  3. Write the electronic configuration —-1M
  4. State postulates of bohrs theory.—3M(very imp)
  5. Write a note on quantum numbers—-4M

III.PERIODIC PROPERTIES OF ELEMENTS;(4H—-6M)

1. State modern periodic law.—1M

2. Define a) electron affinity b)ionization energy c)electronegativity d)atomic radii.—-2M

3. trends— along the periods—1M, along the group—1M

IV. OXIDATION NUMBER;(3H—-5M)

1.Calculate oxidation no. of a) Cromium in potassium dichromate b) Manganese in pot. Permanganate c) Sulphur in sulphuric acid

2. Balance the fallowing equation using oxidation no. concept

a)MnO 4- + Fe 2+ —–>Mn 2+ + Fe 3+

b)

V. s-BLOCK ELEMENTS; (3H—-4M0

1. Write the general electronic configuration of s- blok elements—1M

2. Write the causes due to which lithium exhibits diagonal relation ship with magnesium.(very imp)

4. How does sodium reacts with water?

5. How do atomic size and ionization energy of alkali metals change with increase in atomic number?—-2M

VI. p- BLOCK ELEMENTS; (3H—-5M)

1. Give any two differences between diamond and graphite.—-2M(very imp)

2. What are fullarenes?—1M

3. Discuss the structure of diamond and graphite—-4M(very imp)

4. Write a note on semiconducting property of silicon and germanium.—4M

VII. CHEMICAL BONDING; (7H—-10M)

1. Write Born Habers cycle for the formation of sodium chloride.——3m(very imp)

2. Give the differences between sigma and pi bond—2M

3. Explain a) sp3 hybridisation taking methane as eg. b) sp2 hybridisation taking ethene as eg. c) sp hybridisation taking ethyne as eg.—-4M(very imp)

4. With the help of VSEPR theory explain the structure of a)water molecule b) ammonia molecule——3M(very imp)

5. What is a hydrogen bond? Give eg(very imp)

VIII. STOICHIOMETRY; (8H—-12M)

1. Define the term a) equivalent mass of an element b)atomic mass of an element c) Equivalent mass of acids - 2M(very imp)

2. Problems on a) chloride method b) oxide method—2M

3.Define the term vapour density. Deduce the relation between vapour density and mol. Mass.—–5M(very imp)

4. Determination of mol. Mass of a volatile liquid by victor Mayers method—5M(very imp)

5. What are indicators?—1M

6. Derive the normality equation N1V1=N2V2 —3M(very imp)

7. Problems

IX. STATES OF MATTER- THE GASEOUS STATE; (5H—8M)

1. State a)Boyles law b)charles law c) grahams law d) Daltons law of partial pressure. —-1M

2. Write the postulates of kinetic theory of gases.—4M

3. Derive an expression for pressure exerted by a gas (PV=1/3 mnc2 )—4M(very imp)

4. Problem on kinetic energy—calculate K. E. of 2 mole of nitrogen at 300K.—2M(very imp)

5. Write vanderwaals equation and explain the terms.—2M(very imp)

X. CHEMICAL THERMODYNAMICS-1; (5H—-8M)

1. What is a) an open system b) isolated system c)closed system—1M

2. What is an a)extensive property b) intensive property—1M

3. Calculate workdone  when 2 mole of an ideal gas expands isothermally and reversibly at 300K from 10 atm.pressure to 2 atm pressure.—2M( or volume)(very imp)

4. Define the term a) enthalpy of combustion b) enthalpy of formation c) enthalpy of transition d) enthalpy of solution e) enthalpy of neutralization—2M(very imp)

5. Why enthalpy of neutralization of strong acid with strong base is always constant.-2M(very imp)

6. Write the equation which relates ΔH and ΔE.—1M

Thermochemical problem —-4M—very imp.

XI. CHEMICAL EQUILIBRIUM; (5H—8M)

1.What is meant by rate of chemical reaction. What is the significance of +ve and –ve term?—2M

2. What are the factors which affects rate of a chemical reaction?—2M

3. Defin equilibrium constant.—2M

4. Write the equation which relates Kp and Kc and explain the terms—2M + problems

5. Derive an expression Kp for —–

a) N2+3H2<—>2NH3(very imp)

b)PCl5<—>PCl3  +Cl2(very imp)

c) 2HI <—> H2 +I2(very imp)——4M

6. Problems on Kp = Kc (RT) Δn —-2M

7. With the help of Le cheteliers principle explain effect of temp. conc. And pressure on the equilibrium system a) N2 (g) + O2 (g) 2 NO ( g) Δ H = +180kJ

b) 2SO2  +O2<—>2SO3 Δ H = – 189 kJ————-3M

XII. SURFACE CHEMISTRY; (3H—5M)

1. What is an a ) adsorbate b) adsorbent ——-1M

2. Distinguish between physisorption and chemisorption ——2M(very imp)

3. Write the mathematical form of a)Freundlich adsorption isotherm b)Langmuir adsorption isotherm and explain the terms.—2m(very imp)

4. What is homogeneous catalysis? Give an example.—2M

5. What is heterogeneous catalysis? Give an example.—2M

6. What is positive catalysis? Give an example.—2M

7. What is negative catalysis? Give an example.—2M

8. What are active centers ?—1M

9. What are catalytic poisons ? give ex.—-2M

10 . What are catalytic pramoters ? give ex.—-2M

11. Give any two industrial applications of catalysis.—2M

XIII. AIM AND SCOPE OF ORGANIC CHEMISTRY (1H—1M)

  1. What is chemotherapy?—-1M

XIV. COMPOSITION OF ORGANIC COMPOUNDS; (3H—5M)

  1. How is carbon and hydrogen detected by copper oxide test.?
  2. With a neat labeled diagram explain detection of carbon and hydrogen byleibigs method.—4M(very imp)
  1. Problem – calculation of empirical formula using percentage composition.—3M very imp.

XV; CLASSIFICATION AND NOMENCLATURE; (3H—5M)

  1. IUPAC naming of compounds—2M
  2. What is a functional group?—1M
  3. What is a homologous series?—2M
  4. With an example explain
  5. a) chain isomerism b)position isomerism c)functional isomerism——-2M —very imp.

XVI; HYDROCARBONS -1 (6H—9M)

  1. How is ethane prepared by Kolbes electrolytic reaction.—2M
  2. Explain the free radical mechanism of chlorination of methane.—3M(very imp)
  3. State Markownikoffs rule and explain the mechanism of addition of hydrogen halide to propene.—-4M(very imp)
  4. How is cycloalkanes are prepared from a) dihalo alkanes b) calcium salts of dicarboxylic acids .—–2M each
  5. How is benzene and toluene isolated from coal tar?—–4M(very imp)
  6. Explain Fridel crafts reaction with an example.—2M(very imp)
  7. How does benzene reacts with a) nitrating mixture b)chlorine in presence of Fe c)conc. Sulphuric acid.—-2M each
  8. How is a) HDPE B)LDPE are prepared?—2m EACH
  9. Name the monomer unit of buna-s
  10. Write the formula of isoprene.—1M

XVII; ORGANIC COMPOUNDS CONTAINING OXYGEN; (6H—9M)

  1. What are trihydric alcohols? Give an example.—2M
  2. What are sec. alcohols give an ex.—2M
  3. How is rectified spirit manufactured from molasses.—4M(very imp)
  4. What is the action of a) PCl5 b)conc sulphuric acid on ethanol—-2M each(very imp)
  5. Explain williumsons ether synthesis reaction with an example. —2M very imp.
  6. How does phosphorous penta chloride reacts with diethylether –2M
  7. How do you convert chloro methane to methoxy methane.—2M

practicals-(very imp)

  1. Study of chemical reactions of acid radicals——–5M

  1. How do you determine heat of solution of potassium nitrate or ammonium nitrate in the laboratory?—5M
  2. How do you determine heat of neutralization of HCl and NaOH in the laboratory?—5M

  1. How is equivalent mass of Mg or Al determined by aspirator method?—5M
  2. How is mol;ecular mass of oxygen determined by aspirator method?—5M
  3. How is equivalent mass of Cu determined by oxide method?—5M

—————————————————————————————–

Follow

Get every new post delivered to your Inbox.

Join 358 other followers