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Model Paper

Chemistry Paper - Xl

SECTION - A

Time Allowed: 20 Minutes
Marks : 18

1- The largest no of molecules is present in .
(a) 22 g of Co ₂ (b) 90 g of C6 H12 O6 (c) 49 g of H₂S0₄ (d) 18 g of H₂0
2- The mass of one molecule of H₂O is -------
(a) 18g (b) 0.18g (c) 18 / 6.02 x 10 23 g (d) 6.02x1023 /18 g
3- How many pairs of electrons surround the central atom of "Sn" in the angular SnC12 molecule?
(a) 1 (b) 2 (c) 3 (d) 4
4- The energy carried by a photon is given by ---------------
(a) E-hu (b) E-hc /h (c) Both a and b (d) None of these
5 - The e/m ration for canal rays particles is ------- than that of cathode ray particles.
(a) Smaller (b) Greater (c) Equal (d) may be greater or smaller
6- Which bonds are responsible for hair to be straight or curly?
(a) Hydrogen bonding (b) Disulphide bridge (c) Glycosidic linkage (d) Peptide linkage
7 - Which of the given gases can be liquefied above its critical temperature?
(a) O₂ (b) N₂ (c) H₂ (d) None of these
8 - If the mass of electron is doubled, the Rydberg constant:
(a) Becomes half (b) Becomes double (c) Remains unchanged (d) Becomes one on forth
9 - Hydrolysis of a salt may result in ---------- solution.
(a) Acidic (b) Basic (c) Neutral (d) Any of the given
10 - The value of pkw .. ...with increase in T.
(a) Increases (b) decrease (c) Remains constant (d) Both A & B
11- A crystl can have ---------- centre / centres of symmetry at maximum.
(a) 1 (b) 2 (C) 3 (d) 4
12 - The rate of evaporation of a liquid increases by-------------
(a) Increasing surface area (b) decreasing intermolecular forces
( c) increasing temperature (d) All of these
13 - Rate = K[A][B].This mathematical expression is called ----------
(a) Rate law (b) Rate equation (c) Rate expression (d) All these
14- Daniel cell is not --------- cell.
(a) An electrochemical (b) A Galvanic (c) A voltaic (d) An electrolytic
15 - Which of the given is not a colligative property of a solution?
(a) Lowering of vapour pressure (b) Elevation in BP
(c ) Osmotic pressure (d) Mole fraction