Question

[2x10=20]
Q-3. Name the following.
a) An acid whose formula is H2CO3.
b) The silvery residue obtained on heating mercury (II) oxide,
c) The chemical name of rust.
d) A non-metal which forms a polyatomic molecule with more than three atoms.
e) The constituent of air which is around 0.02%.
The lower boiling point component from methyl alcohol & water.
g) A halogen which is a solid at room temperature.
h) The gas required for both combustion and rusting
i) The element which is a noble gas and radioactive in nature.
D) The product formed on oxidation of phosphorous.​

Answer 1

1.Carbonic acid

2.Mercury

3.Iron oxide

4.oxygen,glucose,water

5.may be benzyl alcohol

6.iodine and astatine

7.oxygen

8.helium [He], neon [Ne], argon [Ar], krypton [Kr], and xenon [Xe]

9.Phosphorus pentoxide. Phosphorus acid. Hydrated iron (III) oxide.