Home
Class 11
PHYSICS
Adding detergents to water helps in remo...

Adding detergents to water helps in removing dirty greasy stains.This is because (I) It increases the oil-water surface tensionn. (II) It decreases the oil-water surface tensionm.(III) Viscosity of oil is high (IV) Dirt is held suspended surrounded by detergent molecules

A

II and IV

B

I only

C

III and IV

D

IV only

Text Solution

AI Generated Solution

Promotional Banner

Similar Questions

Explore conceptually related problems

Which of the following factors are responsible for the increase in the rate of a surface catalysed reaction ? (I) A catalyst provides proper orientation for the reactant molecules (II) Heat of adsorption of reactants on a catalyst helps reactant molecules to overcome activation energy (III) The catalyst increases the activation energy of the reaction (IV) Adsorption increases the local concentration of reactant molecules on the surface of the catalyst. Select the correct answer using the codes given below:

Dirty cloths containing grease and oil stains are cleaned by adding detergents to water. Stains are removed because detergent :

Surface tension of a liquid is a molecular phenomenon of liquids involving the force of cohesion among the liquid molecules. It is a scalar quantity and numerically equal to the surface energy. Numerically, it is proved that the potential enenergy of a liquid is maximum on the surface. Sparingly soluble salts and surface active substances decrease the surface tension of the liquid, however, the fairly soluble solute increase is independent of surface area but if depends on the intermolecular force and the temperature. When oil is placed on the surface of hot water, formation of droplets takes place because :

Find out the correct sentene about manure (i) Manure contains large quantites of organic matter and small quantites of nutrients. (ii) It increases the water holding capacity of sandy soil. (iii) It helps in draining out of excess of water from clayey soil. (iv) Its excessive use pollutes environment because it is made of animal excretory waste.

A drop of olive oil of radius 0.25 mm spreads into a circular film of diameter 20cm on the water surface. Estimate the size of the oil molecule.

A drop of olive oil of radius 0.3 mm spreads into a rectangular film of 30 cmxx15cm on the water surface. Calculate the size of the oil molecule.