Question

Hydrogen constitutes about 21% of the air true or false

Answer 1

false
Because hydrogen content is 1% in atmosphere

Answer 2

ANSWER IS FALSE

BECAUSE

IN THE ATMOSPHERE IS 100%

so

NITROGEN===> (78%)

OXYGEN====>(21%)

ARGON===>(0.9%)

AND OTHER MIXED GASES LIKE====> NEON, HELIUM, HYDROGEN, METHANE, XENON, OZONE AND KRYPTON