How is oxygen gas collected?

At 25^(@)C and 730 mm pressure, 730 mL of dry oxygen was collected. If the temperature is kept constant what volume will oxygen gas occupy at 760 mm pressure?

At 25^(@)C and 730 mm pressure, 380 mL of dry oxygen was collected. If the temperature is constant, what volume will be oxygen occupy at 760 mm pressure ?

On passing electric current through acidified water : (I) Hydrogen gas is collected over cathode and oxygen gas is collected over anode . (II) Oxygen gas is collected over cathode and hydrogen gas is collection over anode. (III) Ratio of Volume of hydrogen gas : oxygen gas = 1 : 2 (IV) Ratio of Volume of hydrogen gas : oxygen gas = 2 : 1 Select the correct statements :

During the electrolysis of water, a total volume of 33.6mL of hydrogen and oxygen gas was collected at STP . Find the amound of electricity that passed during electrolysis.

42 gm of a mixture of propyne (C_(3)H_(4)) and oxygen gas is collected in a vessel and fired. The maximum possible mass (in gm) of water formed is-

50cc of oxygen is collected in an inverted gas jar over water.The atmospheric pressure is 99.4 kPa and the room tempareture is 27^(@)C. The water level in the jar is same as the level outside . The saturation vapour pressure at 27^(@)C is 3.4kPa. Calculate the number of moles of oxgen collected in the jar.

In the electrolysis of water : (i) Name the gas collected at the cathode and anode respectively. (ii) Why is the volume of one gas collected at one electrode double than that at the other ? (iii) How will you test the evolved gases ?