1. Stability of oil-soap-water mixture will be more in comparison to oil-water m
ID: 1007204 • Letter: 1
Question
1.Stability of oil-soap-water mixture will be more in comparison to oil-water mixture
2.When 2 moles of magnesium sulfate is dissolved in 1000 grams of water, will give exactly same value of elevation in boiling-point ( T) as 2 moles of aluminum sulfate dissolved in 1000 grams of water.
3.When enthalpy of solution, is higher than combined value of enthalpy of solute, and enthalpy of solvent, it’s an example of exothermic reaction.
4.Bigger the size of particles in colloidal solutions, more effective is the Brownian motion, and more visible is Tyndall effect.
5.Concentration in mole fraction does not change with change in temperature
6.Rate of reaction in a zero order reaction does not depend on initial concentration of reactants
7.Half-life of a 2nd order chemical reaction does not depend on Initial concentration of reactant
8.Rate constant in a third order reaction will have units mol2 L-2s-1
9.In heterogeneous reactions (solid and gas), adsorption is generally the rate determining step.
10.Concentration ([A]) and time have linear correlation in a zero order reaction.
11.In an exothermic equilibrium reaction, increasing the reaction temperature favors the formation of reactants.
12.The effect of a catalyst on a chemical reaction is to react with product, effectively removing it and shifting the equilibrium to the right.
13.If a reaction is endothermic, increase in the reaction temperature results in an increase in K.
14.If the reaction quotient Q for a reaction is greater than the value of the equilibrium constant K for that reaction at a given temperature, products must be converted to reactants for the system to reach equilibrium.
15.Pure solids and pure liquids are excluded from equilibrium-constant expressions.
Explanation / Answer
Assuming this is a true/ false question:
1.Stability of oil-soap-water mixture will be more in comparison to oil-water mixture
This statement is True as soap is able to combine with both oil and water. Oil and water are usually immiscible. Soap contains hydrophobic and hydrophilic ends. So it is able to interact with both oil and water forming a stable mixture.
2.When 2 moles of magnesium sulfate is dissolved in 1000 grams of water, will give exactly same value of elevation in boiling-point ( T) as 2 moles of aluminum sulfate dissolved in 1000 grams of water.
The elevation in boiling point is directly proportional to the moles of particles of solute in solution. Magnesium sulfate (MgSO4) dissociates into 1 magnesium and 1 sulfate ion. Aluminum sulfate (Al2(SO4)3) dissociates into two Al ions and three sulfate ions. So the moles of particles of solute is higher. Hence, the elevation in boiling point will be different. Hence this statement is False
3.When enthalpy of solution, is higher than combined value of enthalpy of solute, and enthalpy of solvent, it’s an example of exothermic reaction.
When the enthalpy of solution is higher than the value of solute and solvent, heat is absorbed when the solution is formed. So it will be an endothermic reaction. This statement is false.
4.Bigger the size of particles in colloidal solutions, more effective is the Brownian motion, and more visible is Tyndall effect.
The scattering is light is done by the particles. So bigger the size of particles, more the Brownian motion and more the Tyndall effect. So this statement is True.
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