NEET Practice Questions (MCQs) with Answers & Solutions

$ 2Pb(NO_3)_2 \rightarrow 2PbO + 4NO_2 + O_2 $

Concentrated nitric acid oxidizes cane sugar to oxalic acid and water. This reaction is a typical example of oxidation where the sugar is converted into simpler products. The balanced chemical equation for this reaction is: $$C_{12}H_{22}O_{11} + HNO_3 ightarrow C_2H_2O_4 + H_2O.$$

Red phosphorus can be obtained from white phosphorus by heating it with a catalyst in an inert atmosphere. This process prevents the phosphorus from reacting with oxygen in the air and allows the transformation from the more reactive white form to the more stable red form.

When aluminium phosphide (AlP) is reacted with dilute sulfuric acid ($H_2SO_4$), phosphine ($PH_3$) gas is evolved. The reaction can be represented as: $$AlP + 3H_2SO_4 ightarrow Al_2(SO_4)_3 + PH_3.$$ Phosphine is a highly toxic and flammable gas.

$ CaCN_2 + 3H_2O \rightarrow CaCO_3 + 2NH_3 $

Anhydride of Nitrous acid is $ N_2O_3 $ .

Cyclic phosphates are those where the phosphate groups form a ring structure. $ H_5 P_5 O_{15} $ is an example of a cyclic phosphate as it includes a ring of phosphate groups. The other options do not form such cyclic structures.

The Haber process for the manufacture of ammonia ($ NH_3 $) uses iron ($ Fe $) as the primary catalyst, often promoted with molybdenum ($ Mo $) to increase its efficiency and activity. This combination of $ Fe+Mo $ is widely recognized in industrial chemistry.

Dipole moment is influenced by the difference in electronegativity between atoms and the molecular geometry. $ NH_3 $ (ammonia) has the highest dipole moment among the given hydrides because nitrogen is more electronegative than phosphorus, antimony, and arsenic, resulting in a larger separation of charge.

$ Na_2 HPO_4 \rightarrow Na_2 PO^ -_ + H^+ it can give H^+ $ ion in solution