JAWAHAR NAVODAYA VIDYALAYA    
                                                             Class test ( 2021-22)                              
 CLASS -XII                            Sub. - Chemistry              Marks- 40             Time-90min.              
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1. Read the given passage and answer the questions that follow: An ideal solution may be defined as the solution which obeys Rault’s law exactly over the entire range of concentration. The solutions for which vapour pressure is either higher or lower than that predicted by Rault’s law are called non-ideal solutions. Non-ideal solutions can show either positive or negative deviations from Rault’s law depending on whether the A-B interactions in solution are stronger or weaker than A-A or B-B interactions. The following questions are multiple choice questions. Choose the most appropriate answer:  i) Which of the following solutions is/are ideal solution(s)?(I) Bromoethane & Iodoethane         (II) Acetone & Chloroform                                                   (III) Benzene & Acetone (IV) n-heptane & n-hexane .                                                                               *
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ii). For which of the following solutions ∆Hmix and ∆Vmix is negative? *
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(iii) Which of the following is not true for positive deviations? *
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(iv) Following figure show which type of deviation from raoult's law.                                                                                         *
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Captionless Image
(V). Water-Ethanol mixture shows I)positive deviations II). Forms minimum boiling azeotropes III). Shows negative deviations IV). Forms maximum boiling azeotropes *
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2.  Read the passage and answer the questions given. Solid is that form of matter which possess rigidity and hence a definite shape and a definite volume. If intermolecular forces are greater than thermal energy, substance exists as solid. Solids can be classified into two types. Crystalline solids and amorphous solids. Crystalline solids have regular arrangement of particles, definite geometrical shapes, sharp melting points and definite heat of fusion. On the other hand, amorphous solids have no regular arrangement of particles, irregular shapes, melt over a range of temperature and no definite heat of fusion. They are isotropic and under go irregular cleavage on cutting. Ionic solids, Molecular solids, Network covalent solids and metallic solids are other types of metallic solids.            i). A Solid is very hard, electrical insulator in solid as well as molten states and melts at high temperature. What type of solid is it? *
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ii).Which of the following is a crystalline solid? *
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iii)The sharp melting point of crystalline solid is due to *
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iv)Which among the following is a non-polar Molecular solid *
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v) Iodine molecule are held in the crystal lattice By. *
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3. In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer -   (i). Assertion: Soda bottles are sealed under high pressure.    Reason: High pressure decreases the solubility of carbon dioxide gas. *
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ii)Assertion: Molality is a better method to express concentration than molarity Reason: Molality is defined in terms of mass of solvent and not dependent on Temperature *
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iii) Assertion: Graphite is good conductor of electricity however diamond belongs to the category of insulators . Reason: Graphite is soft in nature on the other hand diamond is very hard and brittle. *
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(iv)Assertion: The total no. of atoms present in simple cubic unit cell is one. Reason: Simple cubic unit cell has atoms at its corners, each of which is shared between four adjacent unit cells. *
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(v) Assertion :- BCC & HCP has same packing efficiency Reason :- Both have same number of atoms per unit Cell and same arrangement. *
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3. when electrons are trapped In the crystals in the anionic vacancies *
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4.  The crystal system of a compound with a unit cell dimensions a =b #c and alpha=bita=90 gama=120 is *
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5. Colligative properties depend on *
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 6. Value of Henry's constant KH *
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7.  which of the following colligative properties can provide molar mass of proteins ,polymers or colloids with greater precision *
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8. what will be happen when the red blood corpuscles (RBCs) are placed in 1% NaCl solution.
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Clear selection
9. low atmospheric pressure Low concentration of oxygen in blood and tissues of people living at high altitudes is due to *
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10. the void formed by contact of 6 atom is called *
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11. Schottky defect in crystal is observed when *
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12. which of the following is incorrect for an ideal solution *
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13. packing efficiency of FCC Unit cell is *
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14. The crystal of AgBr shows following defects *
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15. Henry la constant for methane in benzene is 4.27 mm Hg calculate solubility of methane benzene under 760 mm Hg *
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16. silver metal crystallizes in a fcc arrangement with the age of the unit cell having a length a= 407 pm. What is radius of silver atom *
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17. What is the molarity of a solution containing 5 g of NaOH dissolved in 450 ml of the solution *
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18. silver forms ccp lattice the edge length of the unit cell is 408.6 pm. What is the density of silver (atomic mass of Ag=107.9 g Na=6.022*10²3) *
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19. The ABAB....packing and ABC ABC...packing are respectively called as *
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20. A compound contains P and Q elements. Atoms Q are in ccp arrangement while P occupy all tetrahedral sites. Formula of compound is : *
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21. The vacant space in bcc unit cell is *
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22. In a face centred cubic cell, an atom at the face contributes to the unit cell
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Clear selection
23. When a non volatile solid is added to pure water it will: *
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24.  Identify which liquid has lower vapour pressure at 90°C if boiling point of liquid ‘A’ and ‘B’ are 140°C and 180° respectively. *
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25. A solution made by dissolving 9.81 g of a non-volatile nonelectrolyte in 90.0 g of water boiled at 100.37 degree Celsius at 760 mm Hg. What is the approximate molecular weight of the substance? (For water, Kb = 0.51 degree Celsius/m) *
2 points
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