General Knowledge - Chemistry - Discussion

The answer is only (A) the correct explanation is given by @Chemistry Nepal.

By considering RMS velocity equation, speed of the molecule depends on both the factors i.e.Temp. & Molar mass equally. By calculating the RMS values hydrogen will give more value of RMS.

Hence hydrogen will have highest speed at that temp. Than rest molecules given above.

I think A is right. Because hydrogen is a lightest gas and mass decrease then speed increase.

You use the root mean square velocity because the temperature is given and don't blindly consider only the mass of the element.

K.E directly prop.to Temperature. So at this point of view C is correct but According to Graham's law Rate of effusion of a gas is inversely proportional to the square root of the molar mass of its particles so H is very small molar mass in Periodic Table 1.006 somehow, and N is 14. So the correct answer is A.

There are two factors weight and temperature.

Root mean square velocity = 3RT/M.

Obviously hydrogen is very light gas.

Answer A is right.

Because hydrogen is the lightest gas.

Lighter mass and high temperature both are taken into account. So answer is A.

CH4 IS THE ANSWER TO THE QUESTION BECAUSE.

Average speed = Square root of (8RT/pi M).

T = Temperature.

Pi = 22/7 or 3.14.

M = molecular mass.

Now since mass is in denominator. It means molecular mass is inversely proportional to average speed. So as mass increases average speed decreases. And as mass decreases average speed increases.

So find out which of the following has lightest molecular mass?

CH4 = 16 g/mole.

Kr = 83.8 g/mole.

N2 = 28 g/mole.

CO2 = 44 g/mole.

Ar = 39.9 g/mole.

Since CH4 has lowest molecular mass among these so it's average speed will be highest.