Mechanical Properties Of Fluid

Step 1: Increase in temperature increases molecular kinetic energy.
Step 2: Intermolecular attractions are overcome.
Step 3: Hence viscosity decreases.

Step 1: Understanding the H - O Fuel Cell
The fuel cell reaction is: Step 2: Calculating the Charge Passed
Charge passed: Step 3: Finding Water Produced
Water produced: Step 4: Calculating Molarity of NaOH
Moles of NaOH: Molarity: Thus, the correct answer is (A).

Step 1: {Finding Electron Kinetic Energy}
Step 2: {Using de-Broglie Wavelength Formula}
Step 3: {Rearranging for }
Thus, the correct answer is (B).