NEET Practice Questions (MCQs) with Answers & Solutions

(b)

water is a neutral molecule.Its pH is 7.

d.

The hardness of water is estimated by simple titration of $ethylene$ $diamine$ $tetraacetate$ ($EDTA$) solution. $EDTA$ forms stable complexes with metal ion present in hard water.

(b) 1:1:2::e:p:n

(b)

 $$\begin{gathered} \mathrm{Ca}{\left({\mathrm{HCO}}_3\right)}_2 + {\mathrm{Na}}_2{\mathrm{CO}}_3 \stackrel{ }{\to }{\mathrm{CaCO}}_3 + 2\mathrm{Na}\left({\mathrm{HCO}}_3\right) \\ \mathrm{Insoluble} \\ {\mathrm{CaCl}}_2 + {\mathrm{Na}}_2{\mathrm{CO}}_3 \stackrel{ }{\to }{\mathrm{CaCO}}_3 + 2\mathrm{NaCl} \\ {\mathrm{Ca}}^{2+} \mathrm{or} {\mathrm{Mg}}^{2+} \mathrm{ions} \mathrm{are} \mathrm{removed} \mathrm{as} \mathrm{insoluble} \mathrm{cabonates}. \end{gathered}$$

(b) $2{\mathrm{FeSO}}_4 + {\mathrm{H}}_2{\mathrm{SO}}_4 + {\mathrm{H}}_2{\mathrm{O}}_2 \stackrel{ }{\to }{\mathrm{Fe}}_2({\mathrm{SO}}_4{)}_3 + 2{\mathrm{H}}_2\mathrm{O}$

(a) Cu has $E{°}_{OP}$ lesser than H.

(b) ${\mathrm{Na}}_2\mathrm{Z} + {\mathrm{Ca}}^{2+} \stackrel{ }{\to }\mathrm{CaZ} + 2{\mathrm{Na}}^{+}$

(c) ${\mathrm{H}}_2 \stackrel{ }{\to }\mathrm{H} + \mathrm{H}; \mathit{∆}H\mathit{=}\mathit{+}ve$

The forward reaction is favoured by low pressure and high temperature. Follow Le-Chatelier's principle.

(b) ${\mathrm{H}}_2{\mathrm{O}}_2 \stackrel{ }{\to }{\mathrm{H}}_2\mathrm{O} + \left[\mathrm{O}\right]$

(a) Hg is placed below H in electrochemical series.