11 (Plant Science) Chemistry | 2T-2081

SHREE BHIMODAYA MODEL SCHOOL

Kalika Municipality-5, Padampur, Chitwan

SECOND TERMINAL EXAMINATION-2081

Class: 11 Ag                                                                                                                               F.M = 50

Sub: Chemistry                                                               Time: 2 Hrs.                                                         P.M. = 20

                                     Group ‘A’ (Multiple Choice Questions)                          (9×1=9)                                                                         

1. Which of the following is compound

a) Diamond                          b) Graphite                     c) Ozone                       d) pure water

• The most electronegative element in the Periodic Table is

a) Nitrogen                          b) Oxygen                                  c) Chlorine                     d) Fluorine

• Which pair of Atomic number represents s-block elements?

a) 7, 15                                 b) 6, 12                                      c) 9, 17                                       d) 3, 12

• The number mole present in 25g of Calcium Carbonate is

a) 1                                      b) 0.5                                        c) 0.3                                        d) 0.25

• Avogadro’s hypothesis relates

a) Volume of gas with partial pressure                     

b) Mass of gas with its kinetic energy 

c) Volume of gas with number of molecules   

d) Rate of diffusion with its molecular weight

• The chemical formula of Marsh gas is

a) C₂H₆                                 b) CH₄                                        c) CH₃OH                        d) CH₃Cl

• Laughing gas is

a) NO                                   b) N₂O                                       c) N₂O₅                                         d) NO₂

• Who was responsible for the failure of Vital Force Theory?

a) Kolbe                               b) Berthelot                   c) Berzelius                    d) Wohler

• The functional group present in amine is  

            a) NO₂                                        b) OH                                        c) C=O                                       d) NH₂

Group ‘B’ (Short Answer Questions)

1. Define Mole concept in brief. Calculate the price of 1 mole of sugar if it cost Rs.110 per kg. Why Law of conservation of mass called law of indestructibility of matter. (2+2+1)

1. State Modern Periodic law. Define ionization potential. Why does Nitrogen have higher ionization potential than Oxygen although Nitrogen has larger size than Oxygen? (1+2+1)
2. State and explain Boyle’s law. Why do Mountaineers carry oxygen cylinder on their back?

OR

Mention any two properties of organic compound. A fuel has octane number 80. What does it mean? Differentiate between Gasoline engine and Diesel engine?  

1. Why Carbon is considered as the preliminary element in Organic chemistry. Explain Vital Force Theory.                                                                                                                                                                                 (2+2)

1. Write the possible structure of C₅H₁₁Cl .Write its IUPAC name and common name

Group ‘C’ (Long Answer Questions)                                   (2×8=16)

1. Determine the relationship between Molecular weight and Vapor Density. 200g of 90% pure CaCO₃ is completely reacted with excess of HCl to produce CaCl₂, H₂O and CO₂.

a)   Which one is limiting reagent.

b)   Calculate the mass of CaCL₂ formed.

c)   How many molecules of water are formed?

d)   What volumes of CO₂ are produced if the reaction is carried out at 27⁰C temperature and 760mmHg pressure?

                                                   OR

Write Short Notes on (Any2)

            a)         Kinetic Molecular Theory of Gas

            b)         Functional group

            c)         Laboratory preparation of phosphine

1. i)          What do you understand by anti-knocking agent? give an example of it.    (1)

ii)    Define Octane number.                                                                                                                                                   (1)

iii)   Sodium extract is alkaline in nature. Why?                                                                                               (1)

iv)   Give the chemistry of the lassaigne’s test for the detection of nitrogen in organic compound.                                                                                                                                                        (5) “THE END”