From the elements – He, Br, Pt & O ; the element which forms a polyatomic molecule is ….... & which is liquid at room temperature is ……

From the elements – He, Br, Pt & O ; the element which forms a polyatomic molecule is O & which is liquid at room temperature is Br.

From the elements – He, Br, Pt & O ; the element which forms a po…

A $………… [$proton$/$neutron$]$ is a sub$-$atomic particle with no charge and unit mass.

→

Fill in the blank $.........$ is formed when charcoal is burnt in a limited supply of air.

→

$.........$ and $.........$ are the two major crystalline allotropes of carbon.

→

$.........$ is the purest form of natural water.

→

All matter is composed of small particles called ________.

→

The temperature at which a liquid starts changing into its vapour state is $.........$

→

Wood charcoal is an excellent _______________ g agent.

→

Hydrogen is vital constituent of _______________ of plants and animals.

→

In naphthalene, the inter$-$partirle attraction is $............ [$high$/$low$]$

→

Direct combination reaction of phosphorus pentoxide with water gives $\ce{[H_3PO_3 / H_3PO_4}]$.

→