Write two names of metalloid.

Write two names for each of the following : Symbiotic nitrogen-fixing bacteria.

Write two names for each of the following : Fee-living nitrogen-fixing cyanobacteria.

Write two names for each of the following : Free-living aerobic nitrogen-fixing bacteria.

What are metalloids or semi-metals? Write down the name of the metalloids along with their atomic number.

Write the name of triatomic gas.

Write the name of the catalyst used in- Haber's process

Write the name of the catalyst used in- Contact process

Write the name of an antacid which is often used as an antiacid.

Write the name of the catalyst used in- Ostwald process