Question

Give a reason for each of the following:

(i) Noble gases do not combine with other elements to form molecules.

(ii) Dilute nitric acid cannot be used in the preparation of hydrogen.

(iii) Hydrogen although lighter than air, is not collected by the downward

displacement of air.

(iv) Anhydrous calcium chloride turns into a colourless solution when

exposed to air.

(v) Metals form positive ions.​

Answer 1

Answer:

Becoz it has 0 valence electron and r stable

Becoz it is a volatile acid and may volatalize

hydrogen not know ppr but HCl is heavier than air so it is collected by upward displacement