Q13 of 50 Page 1

Why is Ka2 << Ka1 for H2SO4 in water?

The reaction is as follows:


For the molecule of sulphuric acid, it is much easier for the molecule to lose proton as compared to the losing of negatively charged HSO4- because of which the former product is a stronger acid as compared to the latter one.


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Name the method used for the refining of Zr.

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Complete the following chemical equations.

(a) NH4Cl (aq.) + NaNO2 (aq.)


(b) P4 + 3NaOH + 3H2O

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Write the correct formulae for the following coordination compounds:

(i) CrCl3.6H2O (violet with 3 chloride ions precipitated as AgCl)


(ii) CrCl3.6H2O (light green colour, with 2 chloride ions precipitated as AgCl)


(iii)CrCl3.6H2O (dark green colour, with 1 chloride ion precipitated as AgCl)

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Give reasons for the following observations:

p-dichlorobenzene has a higher melting point than those of o and m –isomers.