Question

0.20g of solid iodine was treated with 100cm3 of water at 288k till equilibrium was established .calculate how much iodine remained undissolved ?

Answer 1

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2

Section A

For each question there are four possible answers, A, B, C, and D. Choose the one you consider

to be correct.

1 In a titration experiment, 30 cm3

of 0.05 mol dm-3 phosphorous acid, H3PO3 was found to

exactly neutralise 15 cm3

of 0.20 mol dm-3 aqueous sodium hydroxide. Using this

information, deduce the formula of the salt formed in the neutralisation process.

A NaH2PO3

B Na2HPO3

C Na3PO3

D Na3PO4