Class 11 Chemistry Final Exam Question Paper Collection 2078 (From Different School)
SET A
DEVI SECONDARY SCHOOL
Sub Code: 3011
Birtamod-5, Jhapa
Final Examination-2078
Class : XI Time : 3 hrs
Subject : Chemistry FM : 75
[Candidates are required to give their answer in their own words as for as practicable the figure on the right side indicates full marks.]
Group-A
Circle the best alternative to the following question. [11×1=11]
- The mass of one atom of he is
(a) 3.023×10-23g (b) 6.64×10-24g
(c) 3.32×10-24g (d) 6.64×10-32g
- 4.4 g of an unknown gas occupies 2.24 liters at STP the gas is
(a) SO2 (b) CO (c) O2 (d) CO2
- An element of atomic no 29 belongs to
(a) S-block (b) P-block (c) D-block (d) F-block
- What happens when SO2 gas is passed through an acidifies solution of H2S gas?
(a) SO2 is oxidized to sulphur
(b) H2S is reduced to sulphur
(c) SO2 is oxidized to H2SO4
(d) SO2 is reduced to Sulphur
- H2SO4 is added to charcoal, evolved
(a) SO2 and CO2 (b) SO2 and CO
(b) Water gas (d) no reaction
- Hygos copy is the phenomenon which involve
(a) loss of water (b) gain of water
(c) decomposition (d) none
- Plaster of paris in contact with water sets into hard mass. The composition of hard mass is
(a) CaSO4 . H2O (b) CaSO4 .Ca[OH]2
(c) CaSO4 . 2H2O (d) CasO4 .2Ca[OH]2
- What is the function of “myoglobin”?
(a) metal ion storage (b) transport of oxygen
(c) storage of oxygen (d) all the three
- Thomas slag is
(a) Ca3(PO3)2 (b) CaSiO3
(c) FeSiO3 (d) (a) and (b)
- The correct ground state electronic configuration
(a) [Cr] 4d5 4S1 (b) [Cr] 3d6, 4S0
(c) [Cr] 3d4, 4S2 (d) [Cr] 3d5, 4S1
- IUPAC name of the compound H-C-CH3 is
(a) Methanoic acid (b) Ethanoic acid
(c) Methyl methanoate (d) Ethyl ethanoate
Group – B
Give short answer to the following question [8×5=40]
- Define Aufbau principle. An atom has 2, 8 and 2 electrons in K, L and M shells respectively. Find out the following.
(a) electronic configuration of the atom
(b) total number of principal quantum numbers
(c) total number of sub-sells
(d) total number of s-electron
OR
State graham’s law of diffusion. What are the application of graham’s law of diffusion. Mention any two difference between ideal gas and real gas.
- 7g of pure slaked lime if reacted with 7g of ammonium chloride give CaCl2, NH3 and water. [1+1+1+1]
(a) Find the limiting reagent [1]
(b) Calculate the mole of unreacted reactant left over [1]
(c) How many gram of CaCl2 is formed [1]
(d) What volume of NH3 is produced at 270C and 1.5 atmosphere. [2]
OR
A straight glass tube of length 25 am has two inlets (A) and (B). NH3 gas through the inlet (A) and HCl gas through the inlet (B) are allowed to enter the tube at the same time. White fumes of 4(NH4Cl) Clapper at point (M) inside the tube. Find the distance M form A. [3]
Define G ractam’s law of diffusion. [2]
- Derive the relationship between Kp and Kc.
Give one example of chemical reaction where Kp is greater than Kc. [4.1]
- Explain with reason
(a) KI solution containing starch is turned blue of chlorine gas is passed. [1]
(b) HI containing bottle turns brown on long standing. [1]
(c) HCl can’t be dried by passing over CaO or P2O5. [1]
(d) Brown colour is obtained if chlorine water is add to KI solution containing a few drop of chloroform. [1]
(e) HI is not produced by the same method as for HCl. [1]
- Depending upon the nature of minerals present in the ores reduced by different methods form their oxides.
(a) What do you mean by acid flux and basic flux with examples. [2]
(b) Name of two impurities removed by carbon reduction (somelting) [1]
(c) Why oxides of alkali metal or alkaline earth metals are not reduced by carbon reduction method. Name the method by which these metals are reduced. [2]
- Define Homologous series and write a series containing-CHO as functional group. Write down the IUPAC name of 4th member of this series. What is the general name of this series. [1+2+1+1]
- A haloalkanes ‘X’ undergoes Wurtz reaction to give 2, 3-dimethyl butane as major product
(i) Identify ‘X’ with chemical reaction [2]
(ii) Why 2, 3 dimethyl butane is called saturated hydrocarbon [1]
(iii) What happens when ‘X’ is treated with alcoholic KOH [1]
(iv) Give the example of Kolbe’s reaction [1]
- Draw the flow sheet diagram and principle for the manufacture of nitric acid by ostwald’s process. Write down the reaction of catalytic oxidation of ammonia. How Concentra teal nitric acid is prepared. [3+1+1]
Group-C
Give long answer to the following. [3×8=24]
- Robert Boyle has established the relation between volume of gas and pressure.
(i) State Boyle’s law and draw graphical representation. [2]
(ii) Under which condition all gases do not show ideal behavior. Explain it on the basis of kinetic theory of gases. [3]
(iii) An evacuated vessel weights 50g when empty 148g when with liquid of density 0.98g/ml and 50.5g when filled with an ideal gas at 760 mm Hg at 270C. Determine the molecular mass of the gas. [3]
- Oxygen is the third most abundant element by mass which readily forms oxides with other elements. Some of the oxides are given below.
| Na2O | Al2O3 | CO | SO2 | Fe3O4 | H2O2 |
(i) Identify the acidic oxide, basic oxide neutral oxide and mixede from the above table. [4]
(ii) Write two chemical equations to prove that the particular oxide is amphoteric in nature. [2]
(iii) Why is CO is harmful gas? [1]
(iv) Write any one industrial application of oxygen gas. [1]
OR
State and explain faraday’s law of electrolysis. (First and second law). 0.1978g of copper is deposited during the electrolysis of CuSo4 solution by passing a current of 0.2A for 50mn. Calculate the electrochemical equivalent of copper. (5+3)
- An alKene (C3H6) undergoes ozonolysis and gives ‘X’ and ‘Y’
(i) Write the two steps chemical equation for the conversion of alkene into ‘X’ and ‘Y’ [3]
(ii) Write the structural formula of ‘X’ and ‘Y’ with their IUPA name. [2]
(iii) Which product will be formed by the hydrogenation of the above alkene under suitable condition. [1]
(iv) Which chemical test is used for unsaturated compound and write down the chemical reaction. [2]
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