MODEL TEST PAPER

The four hydrogen atoms of ethene lie in a plane Do you think, four hydrogen atoms of allene also lie in a plane ? Comment.

What is sequestration ? How is hard water made soft by sequestration ?

Phosphoric acid is preferred over sulphuric acid in preparing hydrogen peroxide from peroxides. Why ?

Lithium has the highest ionization enthalpy among alkali metals, yet it is the strongest reducing agent. Why so?

Unlike sodium carbonate, potassium carbonate cannot be prepared by Solvay ammonia process. Why is it so?

$\mathrm{N}({\mathrm{CH}}_3{)}_3$ is pyramidal while $\mathrm{N}({\mathrm{SiH}}_3{)}_3$ is planar. Explain$$

$\mathrm{InCl}$ undergoes disproportionation but $\mathrm{TlCl}$ does not. Explain.

Blood is a buffer of ${\mathrm{H}}_2{\mathrm{CO}}_3$ and ${\mathrm{HCO}}_3^{-}$ with $\mathrm{pH}=7.4$. Given ${\mathrm{K}}_1$ of ${\mathrm{HCO}}_3^{-}$ is $4.5\times {10}^{-7}$.  What will be the ratio of$\left[ {\mathrm{HCO}}_3^{-}\right]$  to $\left[{\mathrm{H}}_2{\mathrm{CO}}_3\right]$ in the blood?