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Sunday, November 29, 2015

S.B. Roll No……..

1st Exam/Common/2555/Dec-2011

Time: 3 Hrs.                                                                           Max. Marks: 75
Q1.    Fill in the blanks:
(1) Dimensional formula of density is …................
(2) Negatively charged ions are called …………
(3) One mole of particles means …………. Particles.
(4) The shape of a p-ortibal is like ……………
(5) Bond length is measured in …………. Unit.
(6) A base is a proton ………
(7) Oxidation involves ………. of electrons by atoms or ions.
(8) The functional group of aldehydes is …………

State true or false:
(1) Every inorganic compound is made up of two radicals.
(2) Isotopes have same number of protons.
(3) Electronic energy is negative because electron has negative charge.
(4) An element with atomic numbers a belongs to a p-block.
(5) Molecule of a methane (CH4) is tetrahedral.
(6) NH40H is a strong electrolyte.
 (7) Chlorine molecules is formed by ionic linkage.


Q2.    Attempt any ten questions.

(1) Write the significance of a chemical equation with an example.
(2) Calculate the number of atoms in 23gms of Na (at mass of Na=23)
(3) Differentiate between S and P orbitals.
(4) Explain line spectrum of hydrogen.
(5) Define covalent bonding with at least two examples.
(6) What are the disadvantages of using hard water in laundary work, paper and textile Industry?
(7) Explain  open and closed systems.
(8) Define ionization and degree of ionization.
(9) A current  of2amp on  passing  through a soln of  AgNO3 for 100 secs, deposited 2.22gms of  Ag, calculate  electrochemical equivalent of Ag,
(10)Define catenation and  functional group.
(11)What is  the difference between an atom and an ion?
(12)Explain the defects in the long form of  the periodic table.


Q3.    Attempt any thee questions.
(1)     (a) What are the various  factors favoring formation of ionic band?         
(b) Balance  the following equation by hit and trial  method.
KclO3  Kcl+0
(c) How many protons and neutrons are three in the nuclei of  178O?­­­­
(2) (a) A sample of   hard  water  is found to contain 272mg of CaSo4  litter, what will be its hardness in .
PPm. (Ca =40,S=32,o=16,  C=12)
(b) Explain industrial application of PH
(3) (a) Define and explain the  process of electrolysis.
(b) Differentiate between saturated and unsaturated hydrocarbons, giving two examples of each.
(4)  (a) Write 1 UPAC  names of the following compounds:
CH3;­­­----- CH--- CH 2 ----CH 2---CH3
             CH 3----CH 2----CH2 ---CH2 -- CH ----CH3

CH 3----CH ----CH ---CH3
                 |          |          
              CH         CH3

  (b) Write the characteristics of chemical e
  equilibrium and explain the types of chemical

(5)     (a) Define co-ordinate or dative bond
          Explain with examples of NH 4 + and NH 3
          BF 4 molecules                                  5
          (b) Calculate the PH value of 0.01m Hcl
          Soln.                                            5



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