NAT II Biological Science Chemistry With Answers

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NAT II Biological Science Chemistry

Sr. # Questions Answers Choice
1 For most of the chemical reactions the rate of reaction Increase as the reaction proceeds Decrease as the reaction proceeds May increase or decrease during the reaction Remains constant as the reaction proceeds
2 The unit rate of a reaction can be increased in general by all the factors except by Using a catalyst Increasing temperature Increasing the activation energy Increasing the conc. of reactants
3 When KClO3is heated, it decomposes into KCl and O2. If some MnO2 is added, the reaction goes much faster because MnO<sub>2 </sub>decomposes to give O<sub>2</sub> MnO<sub>2 </sub>provide heat by reacting Better contact is provided by MnO<sub>2</sub> MnO<sub>2 </sub>acts as a catalyst.
4 The rate of reaction between A and B increases by a factor of 100, and when the concentration with respect to A is increased 10 folds, the order of reaction w.r.t. A is 10 1 4 2
5 A certain current liberate 0.5 g of hydrogen in 2 h. How many grams of copper can be liberated by the same current flowing for the same time in a copper sulphate solution? 12.7 gm 15.9 gm 31.8 gm 63.5 gm
6 A current of 9.65 ampere flowing ofr 10 minutes deposits 3.0 g of the metal which is monovalent. The atomic mass of the metal is 10 50 30 96.5
7 A solution of sodium sulphate was electrolysed using some inert electrodes. The products at the electrodes are O<sub>2, </sub>H<sub>2</sub> O<sub>2,</sub>Na O<sub>2,</sub>SO<sub>2</sub> O<sub>2,</sub>S<sub>2O</sub><sup>2-</sup><sub>8</sub>
8 A cell constant is generally found by measuring the conductivity of aqueous solution of BaCl<sub>2</sub> KCl NaCl MgCl<sub>2</sub>
9 An electrolyte Forms complex ions in solution Gives ions only when electricity is passed Possesses ions even in solid state Gives ions only when dissolved in water
10 When electricity is passed through moten Al2O3+Na3AIF6 and 13.5 gms of Al are deposited, the number of faraday must be 0.5 1.0 1.5 2.0
11 If a salt bridge is removed electrode is made from which of the following? ZnCl<sub>2</sub> CuSO<sub>4</sub> Hg<sub>2</sub>Cl<sub>2</sub> HgCl<sub>2</sub>
12 When quantity of electricity passed is one faraday then the mass deposited at the electrode is equal to One gm. atomic weight One gm. equivalent weight Electrochemical equivalent None of the above
13 Which of the substances Na, Hg, S, Pt and graphite can be used as electrodes in electrolytic cells having aqueous solution? Na, Pt and graphite Na and Hg Pt and graphite only Na and S only
14 Which is not a a colligative property? Osmotic pressure Lowering of vapour pressure Depression of freezing point Elevation of boiling point
15 The molal elevation constant is the ratio of the elevation in boiling point to Mojarity Molality Mole fraction of solute Mole fraction of solvent
16 Which inorganic precipitate acts as semipermeabale membrane? Calcium sulphate Barium oxalate Nickel phosphate Copper ferrocyanide
17 The movement of solvent molecules through a semipermeable membrane is called Electrolysis Electrophoresis Osmosis Cataphoresis
18 Saturated solution of NaCl on heating becomes Super saturated Unsaturated Remains saturated None
19 The osmotic pressure of solution increases if Temperature is decreased Solution constant is increased Number of solute molecules are increased Volume is increased
20 Which of the following is a colligative property? Melting point Osmotic pressure Freezing point Sublimation temperature
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