Answer:
On passing Hydrogen gas over the heated black material coating on the surface of copper sheets :
<u>It becomes Brown due to copper formation</u><u> </u>
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Explanation:
Copper reacts with atmospheric Oxygen (Moisture) and gets black because of the formation of copper oxide (CuO). This reaction is also called oxidation reaction .
On passing Hydrogen gas over the heated black material coating on the surface of copper sheets this<u> black coating become brown</u>. T<u>his is due to formation of Copper again</u>. This is <u>redox- reaction.</u>
Here copper oxide is reduced to copper and Hydrogen is oxidised water.
Cause latin name of Pb is plumbum.
The same K - potassium - latin name is kalium.
The best answer I would think would be A
N just use a electronegativity table
Answer:
Molecules in order of decreasing rate of effusion:
Explanation:
Mass of gas=
Mass of gas =
Mass of gas =
Mass of gas =
According Graham's law:
'The rate of effusion or diffusion of gas is inversely proportional to the square root of the molar mass of the gas'.The equation given by this law follows the equation:
So, higher the molecular mass of the gas lower will be the effusion rate and vice versa.
Increasing order of molecular masses of the given gases:
Decreasing order of effusion rate respective to gases:
Molecules in order of decreasing rate of effusion: