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Maharashtra HSC 12th Class 12 2016 : Chemistry

15 pages, 16 questions, 0 questions with responses, 0 total responses,

Vivek Dixit
Pace IIT, Mumbai
xii science math

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Rao IIT Academy/ XII HSC - Board Exam Chemistry (55) / Paper Solutions JEE | MEDICAL-UG | BOARDS | KVPY | NTSE | OLYMPIADS XII HSC - BOARD - FEB - 2016 Date: 29.02.2016 CHEMISTRY (55) - SOLUTIONS SECTION - I Q. 1 (i) The substance which posses unpaired electrons and high paramagnetic character and when placed in a magnetic field, get strongly attracted and show permanent magnetic moment even when the external magnetic field is removed are said to be ferromagnetic. They can be permanently magntized. [1 Mark] Iron with electronic configuration Ar 3d 6 4s 2 i.e. [Ar] 3d6 4s2 There are four unpaired electron. Hence, Fe is strongly ferromagnetic [1 Mark] Topic:Solid state ; Sub-topic:Magnetic properties _ L-1_Target-2016_XII-HSC Baord (55) Exam_Chemistry (ii) The temperature at which vapour pressure of liquid becomes equal to one atmospheric pressure is called boiling point of that liquid. [1 Mark] Tf m Tf k f . W2 1000 M 2 W1 Where Kf Cryoscopic constant W2 mass of solute W1 mass of solvent M2 molecular mass of non-volatile solute [1 Mark] Topic:Solutions and colligative properties ; Sub-topic:Depression of freezing point _ L-1_Target-2016_XIIHSC Baord (55) Exam_Chemistry (iii) The mathematical expression for the first law of thermodynamics is, U q w When U = change in energy q = heat absorbed by the system W = Amount of work done. Adiabatic process: A process in which heat is not allowed to enter or leave the system at any stage the process is called adiabatic process. q 0 The mathematical expression for first law of thermodynamics is, U q w [1 Mark] U w 1 1

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