SCIENC COLLEGE

PAPER CHEMISTRY 1ST YEAR (SUBJECTIVE) TIME…2.30 HR   MARKS     100

SHORT QUESTIONS.    ATTEMPT ANY   22 QUESTIONS.              (44)

1. Define yield how we calculate the percentage yield of a chemical reaction.

2. explain the law of conservation of mass has to be obeyed  during stokhimetric calculate .

3.  N₂  and co have the same no of electrons, protons and neutrons explain with reasons?

4.What greek philospher’s thought about matter?

5why the instrument dempster’s designed.?

6.write the formula to calculate the % of carbon and also find’s its value?

7.write about molar mass of substance?

8.define stoichiometry?

9.define partition chromatography?

10. write the properties of gases .

11.define gas  laws.

12 write mathematical  expreswswion of boyle’s law charles law ?

 13.explain Fahrenheit  scale.

  14.write the formulas of interconverison  of scales?

  15.write the uses of chromatograpy  16.why          there need  to crtystallize  the crude product?

  17.what is Boyler’s  law of gases. give its experimental verification?

  18.do you think that the volume of any quantity of gas  becomes zero

at 273.16degree.

 19.what is avogadro’s law of gases?

20.what is the general gas equaton?

21.what is Kelvin scale of temperature ?

22.what are isotherms?

 23.write properties of solids?

 24. a solid organic compound is soluble in water as well as in chloroform?

25. what is superchromatogrphy?

    Attempt  any  two   questions.        24

   Q1.what is  a limiting reactants?how does it control the quantity of the product formed? Explain with three examples?

  Q2.state and explain general gas equation

(b) also define ideal gas constant’s.

Q3.  write down the main characteristics of a solvent selected for crystallization of a compound?

   

SCIENCE COLLEGE

PAPER CHEMISTRY (OBJECTIVE) 1st   YEAR Marks.   34        time   30 min

 

Choose the correct answer.

1.     the mass of one mole of electron is .a. 1.008 mg b. 0.55mg c.0.184mg   d  1.673mg.

2.     The no of moles of co₂ which contain 8.0g of oxygen.

          A  0.25   b     0.50     c.   1.0    d   1.50

3  the largest no of molecules are present in .

          a    3.6 g  of H2_O     b   4.8of  C₂ H₅ OHg  of co

          d.    5.4g of  N₂O₅

4.   THE volume occupied by 1.4 g of N₂ at S.T.P is .

     a   2.24 d cubic metre   b   22.4d cubic metre   c.  1.12 d cubic metre  d  112 d cubic meter

5.  one mole of so₂ contains.a  6.02 *10^{23 atoms}   of   o   b  18.1*10^{23 moclecules}

of so₂     c. 0.602 *10²³ atoms of o   d  4 gram atoms of  so₂

6.no of molecules in one  d m³ of water is close to

   a  6.02/22.4 *10²³       b.12.04/22.4 *10²³  c.  18/22.4  *10²³  d. 55.6*6.02*10²³

7. john Dalton  recognized the law of conservation of matter in

       a  1808     b   1904    c   1809   d   1814

   8.   more that such particles are  thought to exist in an atom .

         a   1000      b  1100    c   100    d 11000

    9. masses of atoms range from .a 1o^-27o10^-25kg  b. 10^-27to 10^-29kg

            c  10^{-23 to  10-25  kg}     d  .10^{-27  to  10-25 kg}

      10. when  an atom loses or gains an electron, it forms an .

          a   ion b  molecular  ion   c   molecule   d  atom.

      11  1 gram  of carbon is equal to    a.  1.008g   b.    12.000g   c   238.0g   d   1.018g

      12.23g of sodium is equal to .

         a.   6.02  *10²³atoms of h b   6.02*10²³ atom of NA

               c.  6.02 *1o²³ atom of s  d  6.02 * 10²³  atom of 

   13       2H₂o   +o_{2--------------?}

     A   2H₂o   b   2(H₂O₂)   C  2H₂ O₂       D   4 HO

   14.  THE process of filtration is used to separate the .

            soluble particles      b    insoluble particles  c.  metal particles  d   gas particles.

   15.v&t  and  v=

a   RT  B  T/R   C   KT   D  T/K

16centi grade =5/9[  F -  ?]

  a   32    b   31    c   273.16   d   273.19

  17.  1  passcal  =   a  760    b  101325 pa   c  1Nm^-2   d  101.32 kpa.