Model Question Paper CET Chemistry Panjab University : www.exams.puchd.ac.in

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Panjab University
CET-2011
Subject : Chemistry
Time : 70 minutes Number of Questions : 60 Maximum Marks : 120

1. Among the following molecules, which has the least surface tension ?
(A) Benzene (B) Acetic acid
(C) Diethyl ether (D) Chlorobenzene

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2. In a reversible adiabatic change ?S is
(A) Infinity (B) Zero
(C) equal to CvdT (D) equal to nR In V2/V1

3. Lyophobic colloids are
(A) Reversibel colloid (B) irreversible colloids
(C) protective colloids (D) proteins

4. Which of the statement is correct ?
(A) Physical adsorption is a multilayer phenomenon
(B) Chemical adsorption is a function of adsorbate only
(C) The extent of physical adsorption increases with increase in pressure of the adsorbate and ultimately attain a limited value
(D) Physical adsorption is a monolayer phenomenon

5. 2 mol of an ideal gas expands isothermally and reversibly from 1 L to 10 L at 300 K. What is the enthalpy change ?
(A) 4·98 K (B) 11·47 K
(C) –11·47 kJ (D) 0 kJ

6. Zn | Zn2+ (0·1 M) | | Fe2+ (0·001 M) | Fe.
The emf of the above cell is 0·2905 V. The equilibrium constant for the cell reaction is
(A) 100·32/0·0591 (B) 100·32/0·0295
(C) 100·26/0·0295 (D) 100·32/0·295

7. If all the species are in their standard states, which of the following is strongest oxidizing agent ?
(A) Br– (B) Zn2+
(C) Fe2+ (D) Co3+

8. However great the pressure, a gas cannot be liquefied above its
(A) Boyle temperature (B) inversion temperature
(C) critical temperature (D) room temperature

9. Consider the equation Z = pV/RT. Which of the following statements is correct ?
(A) when Z > 1, real gases are easier to compress than the ideal gas.
(B) when Z = 1, real gases get compressed easily.
(C) when Z > 1, real gases are difficult to compress.
(D) when Z = 1, real gases are difficult to compress.

10. The enthalpy of neutralization of an acid by a strong base is –57·32 kJ mol–1. The enthalpy of formation of water is –285·84 kJ mol–1. The enthalpy of formation of hydroxyl ion is
(A) +228·52 kJ mol–1 (B) –114·26 kJ mol–1
(C) –228·52 kJ mol–1 (D) +114·26 kJ mol–1

11. Which of the following statements is incorrect ?
(A) The entropy of an isolated system increases in an irreversible process.
(B) The entropy of an isolated system remains unchanged in a reversible process.
(C) Entropy can never decrease
(D) ?S (system) as well as ?S (surroundings) are negative quantities

12. The unit cell of CO2(s) is
(A) fcc (B) bcc
(C) linear (D) hcp