Question

Q.13 Which of the following contains covalent bond?

(a) Mgcl2
(b) CaF2
(c) Al2O3
(d) HCI

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Answer 1

Answer:

Pb(NO3)2 Δ-> PbO + O2 + NO2 . The number of NO2 molecules in balanced equation are​

Explanation:

Pb(NO3)2 Δ-> PbO + O2 + NO2 . The number of NO2 molecules in balanced equation are​

Answer 2

Answer:(d)

Explanation:Hydrogen chloride is a diatomic molecule, consisting of a hydrogen atom H and a chlorine atom Cl connected by a covalent single bond. Since the chlorine atom is much more electronegative than the hydrogen atom, the covalent bond between the two atoms is quite polar.