Question

How is hydrogen gas collected in the laboratory and why?
Write three differences between anode and cathode.​

Answer 1

Answer:

it is collected by downward displacement of air because it is insoluble in water and it's density is less than air

anode is negative terminal of battery

cathode is positive terminal of battery

anode attracts positively charged particles called anions

cathode attracts negatively charged particles called as cations

Answer 2

Answer:

Hydrogen gas is prepared in laboratory by the action of dilute HCl upon granulated zinc. The hydrogen gas thus formed is collected in a gas jar through delivery tube by the downward displacement of water. Purification: The hydrogen gas thus obtained may contain different impurities like H2S, NO2, CO2, moisture etc.

anode

• The anode is the electrode where electricity moves into.
• The anode is usually the positive side
• It acts as an electron donor.
• In an electrolytic cell, oxidation reaction takes place at the anode.
• In galvanic cells, an anode can become a cathode.

Cathode

• The cathode is the electrode where electricity is given out or flows out of.
• A cathode is a negative side.
• It acts as an electron acceptor.
• In an electrolytic cell, a reduction reaction takes place at the cathode.
• In galvanic cells, a cathode can become an anode.