ECAT Chemistry Online Test With Answers

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ECAT Chemistry Online Test

Sr. # Questions Answers Choice
1 Which of the following statements is true about Galvanic cell Anode is negatively charged Reduction occurs at anode Cathode is positively charge Reduction occurs at cathode
2 The cathodic reaction in the electrolysis of dill H2SO4with Pt electrodes Reduction Oxidation Both oxidation and reduction neither oxidation or reduction
3 In the presence of copper electrodes the electrolysis of aqueous CuSO4produces at cathode H<sub>2</sub>gas O<sub>2</sub>gas SO<sub>2</sub>gas Cu metal
4 Strong oxidizing agents have Greater positive value of standard reduction potential Lesser positive value of standard Greater negative value of standard None of these
5 Zn H S O
6 Matals usually conduct electricity because There are mobile electrons in the metallic structure Metals are decomposed by current Metals have high resistance In metals the ions are free to move
7 A cell in which spontaneous redox reaction generates an electric current is called Electrolytic cell Electrochemical cell Voltaic or Galvanic cell Biological cell
8 The freezing mixture used in ice cream machine consists of ice and NaCI KCI MgCI<sub>2</sub> NaNO<sub>3</sub>
9 3.6% WN solution of HCI has the molairity 1.0 1.15 0.98 1.98
10 If 5.85 of NaCI are dissolved in 90g of water the mole fraction of NaCI is 0.1 0.01 0.2 0.0196
11 According to Raoult's law Relative lowering of V.P. is equal to mole fraction of solute The lowering of V.P. is directly proportional to mole fraction of solute V.P. of solvent above solution is equal to product of V.P. of pure solvent and mole fraction of solvent ins solution All of the above
12 A solutiion of 0.5 mole camphor in 100 grmas chloroform (Kb= 0.322) has rise in boiling point than that of chloroform by 0.81°C 1.61°C 1.81°C 0.61°C
13 Which of the following half molar solutions will have lowest freezing point Solution of non-volatile, none electrolyte Solution of non volatile, weak electrolyte Solution of non volatile strong electrolyte Solution of volatile, non electrolyte
14 Which of the following salts mixed with ice to make the freezing mixture used in ice cream machine KNO<sub>3</sub> NH<sub>4</sub>NO<sub>3</sub> AgNO<sub>3</sub> Mg(NO<sub>3</sub>)<sub>2</sub>
15 Which one of the following is used as antifreeze in the radiator Methanol Ethanol Ethylene glycol Glycerin
16 Which one of the following solution will have higher vapour pressure than that of water Aqueous solution of methanol Aqueous solution of HCI Aqueous solution of glucose Aqueous solution of urea
17 Solubility cure of Na2SO410H2shows Constant increase of solubility Constant decreases of solubility Discontinuously solubility wit temperature None of above
18 Which of the following aqueous solutions have the lowest freezing point 5.85% NaCI 6% urea 34.2 sucrose All of them have same freezing points
19 Aqueous solution of glucose C6H12O6, boils at 100.052°C. The solution contains 180 grams glucose in 1 kg water 18 grams glucose in 1 kg water 1.8 grams glucose in 1 kg water 3.6 grams glucose in 1 kg
20 Solubility of a substance in water decreases with rise in temperature except CaCI<sub>2</sub>. 6H<sub>2</sub>O Pb(NO<sub>3</sub>)<sub>2</sub> K<sub>2</sub>Cr<sub>2</sub>O<sub>7</sub> Ce<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>
21 Saturated solution of a solid is prepared at a constant temperature. 100 cm3of this saturated solution is evaporated in a china dish. The mass of the residue is called Azetropic mixture Solubility Solubility product Equilibrium constant
22 Which one of the following has continuous solubility curve NH<sub>4</sub>NO<sub>3</sub> CaCI CaCI<sub>2</sub>. 6H<sub>2</sub>O Na<sub>2</sub>SO<sub>4</sub>. 10H<sub>2</sub>O
23 Which one of the following has discontinuous solubility curve CaCI<sub>2</sub>6H<sub>2</sub>O NaCI KCI NaNO<sub>3</sub>
24 Elevation of boiling point is measured by Beckmann's apparatus Lands Berger's method Antifreeze apparatus None of these above
25 A Solution containing 6.8 g of non-ionic solute in 100g of water was found to freeze at -0.93°C. If krfor water is 1.86 and molecular mars of solute is 13.6 34 68 136
26 Which of the following liquid pairs shown a positive deviation from Raoult's law CH<sub>3</sub>COOH<sub>3</sub>+ CH<sub>3</sub>CI C<sub>6</sub>H<sub>6</sub>+ CH<sub>4</sub>OH H<sub>2</sub>O + HCI H<sub>2</sub>O + HNO<sub>3</sub>
27 Which statement is incorrect for and ideal solution The forces of attractions between solute and solvent molecules are same There is no evolution or absorption of heat Volume of the solution is less than sum of volumes of individual components Vapour pressure of solution is directly proportional to the mole fraction of solvent
28 Which of the following mixture of liquids show negative deviation form Raults law Ethyl alcohol and ether HCI and water Phenol- water Chlorobenene-bromobenene
29 Which one of the following mixture shows positive deviation form Rault's law and forms an azetrope with minimum boiling point Methanol + CCI<sub>4</sub> Methanol + acetone Ether + HCI Acetone + chloroform
30 Which if the following has the highest freezing point at one atmosphere 0.1 M NaCI 0.1 M sugar solution 0.1 M BaCI<sub>2</sub> 0.1 M FeCI<sub>2</sub>solution
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