Give reasons for the following change
i] pure water a non-electrolyte - becomes an electrolyte on addition of dil `H_(2)SO_(4)`
ii] Blue colour ofaq `CuSO_(4)` - turns almost colourless on its electrolysis using Pt electrodes.

Give balanced equations for the following reactions using sulphuric acid . Formation of a black mark on a piece of wood on addition of conc . H_(2)SO_(4) to it .

In electrolysis of dil. H_(2) SO_(4) using platinum electrodes:

Give reason for the following : (a) Conc. H_2 SO_4 cannot be used for drying H_2 . (b) KMnO_4 should not be dissolved in conc. H_2 SO_4 .

Give suitable reason(s) for each of the following: H_2SO_4 is not used to dry ammonia.

A: H_(2) and O_(2) are obtained if dil. Solution of Na_(2)SO_(4) is electrolysed using Pt electrodes. R: Platinum electrode is inert electrode.

Colourless salt (A) +dil. H_(2)SO_(4) or CH_(3)COOH + KI to blue colour with starch. (A) can be

State the reason for difference in product formed at the anode during electrolysis of aq. CuSO_(4) soln. using i] active electrodes ii] inert electrode-platinum anode.

A lead storage cell is discharged which causes the H_(2)SO_(4) electrolyte to change from a concentration of 34.6% by weight (density 1.261gml^(-1) at 25^(@)C ) to one of 27% by weight. The original volume of electrolyte is one litre. Calculate the total charge released at anode of the battery. Note that the water is produced by the cell reaction as H_(2)SO_(4) is used up. over all reaction is. Pb(s)+PbO_(2)(s)+2H_(2)SO_(4)(l)to2PbSO_(4)(s)+2H_(2)O(l)

Which of the following anions are producing same gas on treatment with (Zn+ " dil." H_(2)SO_(4)) . I :SO_(3)^(2-) " " II : HSO_(3)^(-) " " III : S^(2-) " " IV : Cl^(-)

Write the equations for the lab , preparation of [i] Na_(2)SO_(4) using dil , H_(2)SO_(4) . [ii] PbSO_(4) using dil H_(2)SO_(4) .