Friday, June 08, 2012

SOLUTIONS BOARD EXAMINATION PAPERS FREE (X, XII) CHEMISTRY PHYSICS BIOLOGY (CBSE, ISC, WB, PSEB)

Dear students

I provide solutions to the board exam questions.
It is absolutely free.
Please leave questions in comments to get the solutions.
Thanks.


4 comments:

Anonymous said...

What are Monobasic acids and what are amphoteric oxides?

aamarpali said...

Monobasic acid has on one hydrogen to donate to the base example is HCl, HNO3

Amphoteric substance can act either as an acid.

Examples of Amphoteric oxides are ZnO and PbO

Reaction of PbO
with acid: PbO + 2HCl → PbCl2 + H2O
with base:
PbO + Ca(OH)2 +H2O → Ca2+Pb(OH)4]2-

aamarpali said...

please correct Monobasic acid has only one hydrogen to donate to the base.

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