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SUPERIOR SCIENCE COLLEGE,

SARGODHA.

Examination: First Term Subject: Chemistry(1st year)

Name:----------------------------------- Roll. No.-----------------------

Time: 30 minutes SECTION -A (Objective) Max. Marks: 17 NOTE: ATTEMPT ALL QUESTIONS IN THIS SECTION, CUTTING AND OVERWRITING IS NOT ALLOWED .

Q.No. 1. Encircle the best suitable options given below after each question. (17)

(i) Masses of atoms ranges from ---------------.

a. 10-25 to 10-27 b. 10-24 to 10-20 c.10-27 to 10-25 d. all of above

(ii) ----------------------------discovered the phenomenon of isotopy.

a. Berzelius b. Schrdinger c. Soddy d. none of above.

(iii) During determination of empirical formula by combustion analysis, water vapours are absorbed in ------------------

a. KOH b. CaO c. CaCO3 d. [ Mg (ClO4)]

(iv) The molar volume of an ideal gas at STP is equal to-----------------.

a. 22.414 dm3 b. 101315 cm3 c. 2.214 m3 d. none of above

(v) The number of moles of CO which contain 8g of O2-----------------------------.

a. 25 b. 50 c. 1 d. 1.5

(vi) Whatmann paper No. ------------------- is generally used in chromatography.

a .41 b. 42 c. 1 d . None of these

(vii) Solvent Extraction is an equilibrium process and it is controlled by-----------------.

a. law of mass action b. the amount of solvent c. distribution law d. the amount of solute

(viii) When fluted filter paper is used in filtration process the rate of filtrations is -----------------

a. decreased b. increased c. become moderate d. not effected

(ix) The molar volume of CO2 is maximum at ---------------.

a. STP b. 127 0C & 1 atm c. 0 0 C & 2 atm d. 2730 C & 2 atm

(x) All gases could be liquefied by Linds method except ---------------.

a. Ne & Ar b. Xe & Kr c. H2 & He d. all of above.

(xi) Kinetic molecular theory was proposed by -------------.

a. Bernoulli (1738) b. Clasius (1901) c. Clasius (1857) d. van der Wall (1902)

(xii) 1 torr pressure is equal to ----------------.

a. 1NM-2 b. 760 atm c. 760 mm of Hg d. none of these

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(xiii) Gases behave non ideally at --------------------.

a. high P & low T b. low P & high T c. at 2 atm & 300 K d. both b& c

(xiv) Acetone & chloroform are soluble in each other due to --------------------------.

a. Intermolecular H- Bonding b. Dipole dipole interaction c. Instantaneous dipoles

d. All of above

( xv) London forces are present among following molecules --------------------.

a. Molecules of water in liquid state b. atoms of He in gaseous state c. molecules of solid iodine

d. molecules of HCl gas

(xvi) When water freezes at 00 C , its density decreases due to -----------------------.

a. Intermolecular H-bonding b. ion dipole interaction c. instantaneous dipole d. all of above

(xvii) Alcohol is soluble in water due to

a. Debye forces b. London dispersion Forces c. dipole dipole intermolecular forces d. all of these

GOOD LUCK!