NEET Practice Questions (MCQs) with Answers & Solutions

(a) Only Li combines directly with nitrogen to form lithium nitride,

                   $6\mathrm{Li} + {\mathrm{N}}_2 \stackrel{ }{\to }2{\mathrm{Li}}_3\mathrm{N}$

(d) 

Low ionization potential of sodium, Photosensitivity of sodium, Sublimation of metallic sodium to give yellow colour, Emission of excess energy absorbed as a radiation in the visible region)

(b) A deliquescent substance absorbs water to the extent that it forms a saturated solution.

(b) The basic character of oxides decreases along the period.

(a) Pearl ash is K2CO3; caustic potash is KOH.

(c) K reacts with HCl violently.

(d) Na₂CO₃ reacts with MgSO₄ to give basic magnesium carbonate.

   $2{\mathrm{MgSO}}_4 + 2{\mathrm{Na}}_2{\mathrm{CO}}_3 + {\mathrm{H}}_2\mathrm{O} \stackrel{ }{\to }{\mathrm{MgCO}}_3.\mathrm{Mg}(\mathrm{OH}{)}_2 + 2{\mathrm{Na}}_2{\mathrm{SO}}_4 + {\mathrm{CO}}_2$

(c) $$\begin{gathered} \mathrm{Cathode}: 2{\mathrm{H}}_2\mathrm{O} + 2e \stackrel{ }{\to }{\mathrm{H}}_2 + 2{\mathrm{OH}}^{-} \\ \mathrm{Anode}: 2{\mathrm{Cl}}^{-}\stackrel{ }{\to }{\mathrm{Cl}}_2 + 2e \end{gathered}$$

(c) $$\begin{gathered} \mathrm{At} \mathrm{anode}: 2{\mathrm{Cl}}^{-} \stackrel{ }{\to }{\mathrm{Cl}}_2 + 2e \\ \mathrm{At} \mathrm{cathode} : 2\mathrm{H} + 2e\mathit{ }\stackrel{\mathit{ }\mathit{ }\mathit{ }\mathit{ }\mathit{ }\mathit{ }\mathit{ }\mathit{ }}{\mathit{\to }}{\mathrm{H}}_2 \end{gathered}$$

(b) It is a reason for given fact.