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The P-Block Elements

Question
CBSEENCH12006660
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Why is Ka2 < < Ka, for H2SO4 in water?

Solution

In aqueous solution, sulphuric acid ionizes in two steps:
H2 SO4 is very strong in water largely because of its first ionisation to H3O+ and HSO4–.

H2SO4(aq) +H2O(l)→ H3O+ (aq) + HSO4-   (Ka1
HSO4-  + H2O(l) → H3O+ +SO4-2               (Ka2



The ionisation of HSO4– to H3O– and SO42– is very small. That is why Ka2 < < Ka1,.

Some More Questions From The p-Block Elements Chapter

Why are pentahalides more covalent than trihalides?

Why is BiH3 the strongest reducing agent amongst all the hydrides of Group 15 elements?

Why is N2 less reactive at room temperature?

Mention the conditions required to maximise the yield of ammonia.

What is the covalency of nitrogen in N2O5?

Bond angle in PH4+ is higher than that in PH3. Why?

Write a balanced equation for the hydrolytic reactions PCl5 in heavy water.

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