91Ó°ÊÓ

The hydroxide of which metal ion is soluble in excess of sodium hydroxide solution: \(\left.\begin{array}{lll}\text { (a) } \mathrm{Fe}^{\mathrm{t++}} & \square \text { (b) } \mathrm{Cr}^{+++}\end{array}\right]\) (c) \(\mathrm{Al}^{+++}\) \(\square\) (d) \(\mathrm{Cu}^{++}\) [

What product is obtained after electrolysis in Solvay trough cell? (a) \(\mathrm{NaOH}\) \(\square\) (b) sodium amalgam \(\square\) (c) Na \(\square\) (d) \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) \(\square\)

The solubility of iodine in water is increased by: (a) boiling the solution (b) cooling the solution (c) adding acid (d) adding potassium iodide

Sodium carbonate solution is alkaline due to: (a) hydrolysis of \(\mathrm{Na}^{+}\) (b) hydrolysis of \(\mathrm{CO}_{3}^{-7}\) (c) hydrolysis of both \(\mathrm{Na}^{+}\) and \(\mathrm{CO}_{3}^{-}-\) ions (d) none of the above

When sodium is added in scanty water, it catches fire. In this process which one of the following burns? (a) Na . (b) \(\mathrm{H}_{2} \mathrm{O}\) (c) \(\mathrm{CO}\) (d) \(\mathrm{H}_{2}\)

For the preparation of sodium thiosulphate by "Spring's reaction", the reactants used are : \(\quad\) [E.A.M.C.E.T. 2003] (a) \(\mathrm{Na}_{2} \mathrm{~S}+\mathrm{Na}_{2} \mathrm{SO}_{3}+\mathrm{Cl}_{2} \square\) (b) \(\mathrm{Na}_{2} \mathrm{~S}+\mathrm{SO}_{2}\) (c) \(\mathrm{Na}_{2} \mathrm{~S}+\mathrm{Na}_{2} \mathrm{SO}_{3}+\mathrm{I}_{2} \square\) (d) \(\mathrm{Na}_{2} \mathrm{SO}_{3}+\mathrm{S}\)