Which of the following statements is correct?

Among the following gaseous element with atomic number which will have greater rate of diffusion

The rate of diffusion of gas at a constant temperature and pressurea) Directly proportional to densityb) Directly proportional to the square root of the molecular weightc) Inversely proportional to the square root of the vapour densityd)Directly proportional to its RMS velocity

A gas diffuses four times as quickly as oxygen.The molecular weight of the gas is

Match the following<figure class="table" style="float:left;"><table><tbody><tr><td style="border:1pt solid #000000;padding:5pt;vertical-align:top;">List1</td><td style="border:1pt solid #000000;padding:5pt;vertical-align:top;">List2</td></tr><tr><td style="border:1pt solid #000000;padding:5pt;vertical-align:top;">A) Effusion</td><td style="border:1pt solid #000000;padding:5pt;vertical-align:top;">1) &nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>rα</mi><mfrac><mn>1</mn><msqrt><mi mathvariant="normal">d</mi></msqrt></mfrac></math>&nbsp;</td></tr><tr><td style="border:1pt solid #000000;padding:5pt;vertical-align:top;">B) Velocity of gas molecules</td><td style="border:1pt solid #000000;padding:5pt;vertical-align:top;">2) Collision of molecules on the walls</td></tr><tr><td style="border:1pt solid #000000;padding:5pt;vertical-align:top;">C) Pressure of the gas</td><td style="border:1pt solid #000000;padding:5pt;vertical-align:top;">3) Vector quantity</td></tr><tr><td>&nbsp;</td><td>4) Scalar quantity</td></tr></tbody></table></figure> &nbsp;

The reaction between gaseous&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>NH</mi><mn>3</mn></msub></math>&nbsp;and&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>HBr</mi></math>&nbsp;produces a white solid&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>NH</mi><mn>4</mn></msub><mi>Br</mi></math>. Suppose that&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>NH</mi><mn>3</mn></msub></math>&nbsp;and&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>HBr</mi></math>&nbsp;are introduced simultaneously into the opposite ends of an open tube of 1 metre long. Where would you expect the white solid to form?

Which of the following statements is correct?

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