Wednesday, October 7, 2009

IIT JEE Chemistry Final Revision Sets No.38

1. Anyhydrous ferric chloride can be prepared from its hexahydrated salt by treating with 2, 2-dimethoxypropane.

Give the balanced equation.

2. State true or false

The conjugate base of H2PO4- is HPO42-

3. Assertion-Reason type

Statement: F atom has a less negative electron affinity than CI atom.
Reason: Additional electrons are repelled more effectively by 3p electrons in CI atom than by 2p electrons in F atom.

4. Reaction of phosphoric acid with Ca5(PO4) F yields a fertilizer “triple superphospate” Represent the same through balanced chemical equation.

5. An aqueous solution containing 0.10g KIO3 (formula weight = 214.0) was treated with an excess of KI solution. The solution was acidified with HCI. The liberated I2 consumed 45.0 mL of thiosulphate solution decolourise the blue starch-iodine complex. Calculate the molarity of the sodium thiosulphate solution.

Source: 1998 JEE

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