ECAT Chemistry Online Test With Answers

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ECAT Chemistry Online Test

Sr. # Questions Answers Choice
1 Vant Hoff's factor of Ca(NO3)2is 1 2 3 4
2 Units of molarity are gm/lit mol/lit kg/lit None of these
3 What is the molarity of H2SO4solution that has density of 1.84 gm/cc at 35°C and contains 98% by weight? 4.18 M 8.14 M 18.4 M 18 M
4 The volume of 0.1 M H2SO4required to neutralize completely 40 ml of 0.2 M NaOH solution is 10 ml 40 ml 20 ml 50 ml
5 The concentration units independent of temperature would be Normality Mass-volume precent Molality Molarity
6 Isotonic solutions have same Molar concentration Molality Normality None of these
7 Which of the following is not a colligative property? Depression in freezing point Elevation of boiling point Osmotic pressure Modification of refractive index
8 If 5.85 g of NaCl are dissolved in 90 g of water, the mole fraction of NaCl is 0.1 0.01 0.2 0.0196
9 At 25°C, the highest osmotic pressure is exhibited by 0.1 M solution of CaCl<sub>2</sub> KCl Glucose Urea
10 Equal volumes of 0.1 M AgNO3and 0.2 M NaCl are mixed. The concentration of NO-3 ions in the mixture will be 0.1 M 0.05 M 0.2 M 0.15 M
11 The process of osmosis was first discovered by Nollet Pfeffer Traube Dutrochet
12 Osmotic pressure of a solution increases by Decreasing the temperature Increasing the volume Increasing the number of molecules of the solute None of the above
13 The example of colligative property is Boiling point Osmosis Freezing point Osmotic pressure
14 The molal depression constant depends upon Nature of solute Nature of solvent <span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 16px;">Δ H<sub>solution</sub></span> Vapour pressure of solution
15 Solution which distill without change in composition or temperature are called Amorphous Azeotropic mixture Ideal Super saturated
16 1.0 g pure calcium carbonate was found to require 50 ml of dilute HCl for complete reaction. The strength of HCl solution is given by 4 N 2 N 0.4 N 0.2 N
17 If 18 g glucose (C6H12C6) is present in 1000 g of an aqueous of glucose it is said to be 1 molal 1.1 molal 0.5 molal 0.1 molal
18 Which is not a colligative property? Osmotic pressure Lowering of vapour pressure Depression of freezing point Elevation of boiling point
19 The molal elevation constant is the ratio of the elevation in boiling point to Molarity Molality Mole fraction of solute Mole fraction of solvent
20 Which inorganic precipitate acts as semipermeable membrane? Calcium sulphate Barium oxalate Nickel phosphate Copper ferrocyanide
21 The movement of solvent molecules through a semipermeable membrane is called Electrolysis Electrophoresis Osmosis Cataphoresis
22 Saturated solution of NaCl on heating becomes Super saturated Unsaturated Remains saturated None
23 The osmotic pressure of solution increases if Temperature is decreased Solution constant is increased Number of solute molecules are increased Volume is increased
24 Which of the following is a colligative property? Melting point Osmotic pressure Freezing point Sublimation temperature
25 In cold countries ethylene glycol is added to water in radiators of cars during winter. It results in Lowering in b.pt Reducing viscosity Reducing specific heat Lowering in freezing pt
26 What happens when isotonic solution of A (mol.wt.342) and B (mol.wt 60) are put in to communication through semipermeable membrane? Transference of solvent from solution A to that of B take place Transference of solvent from solution B to that of A takes place No transference of solvent from solution A to that of B takes place Change in temperature of solutions takes place
27 The freezing point of 1 molal NaCl solution assuming NaCl to be 100% dissociated in water in -1.86<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span> -3.72<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span> +1.86<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span> +3.72<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span>
28 0.5 4.0 2.5 0.25
29 Ammonium carbonate when heated to 200°C gives a mixture of NH3and CO2vapour with a density of 13.0. What is the degree of dissociation of ammonia carbonate? 3/2 1/2 2 1
30 Increase in concentration of 1 Decrease in concentration of I<sub>2</sub> Increase in temperature Increase in total pressure
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