Chemistry, asked by dgowdakhalli08, 1 year ago

send important question for chemistry 1st puc
plz make it fast tommaro is my exam

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Answered by anshu1079

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Answered by ajhabinodjha

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. SOME BASIC CONCEPTS OF CHEMISTRY

1.Law of definite proportions

2.Law of multiple prportions.

3.Problems based on finding molucular and emperical formula

II.ATOMIC STRUCTURE

Explain the formation of spectral lines in hydrogen spectrum on the bases of Bohrs theory.—4M

State a)Paulis exclusion principle. b)Hunds rule c) (n+l) rule –2M(very imp)

Write the electronic configuration —-1M

State postulates of bohrs theory.—3M(very imp)

Write a note on quantum numbers—-4M

III.PERIODIC PROPERTIES OF ELEMENTS+

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. REDOX REACTION

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+

V. S-BLOCK ELEMENTS

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

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

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. STATES OF MATTER- THE GASEOUS STATE

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)

IX. THERMODYNAMICS

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.

X. CHEMICAL EQUILIBRIUM

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) Δ

—-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

XI. ORGANIC CHEMISTRY

IUPAC naming of compounds—2M

What is a functional group?—1M

What is a homologous series?—2M

With an example explain

a) chain isomerism b)position isomerism c)functional isomerism——-2M —very imp.

VI; HYDROCARBONS -1 (6H—9M)

How is ethane prepared by Kolbes electrolytic reaction.—2M

Explain the free radical mechanism of chlorination of methane.—3M(very imp)

State Markownikoffs rule and explain the mechanism of addition of hydrogen halide to propene.—-4M(very imp)

How is cycloalkanes are prepared from a) dihalo alkanes b) calcium salts of dicarboxylic acids .—–2M each