Mole Concept & Redox
Some Basic Concepts of Chemistry
Oxidation number of 'Co' in Hg[Co(SCN)4]
An aqueous solution containing 0.10 g KIO3 (formula weight=214.0) was treated with an excess of KI solution the solution was acidified with HCl. The liberated I2 consumed 45.0 " mL of " thiosulphate solution to decolourise the blue starch-iodine complex. Calculate the molarity of the sodium thosulphate solution.
Assertion: In the titration of Na2CO3 with HCl using methyl orange indicator, the volume of acid required is twice that of the acid required using phenolphthalein as indicaton.
Reason: Two moles of HCl are required for the complete neutralisation of one mole of Na2CO3.
3g of actived chacoal was added to 50mL of acetic acid solution (0.06N) in a flask. After an hour it was filterred and the strength of the filtrate was found to be 0.042N . The amount of acetic adsorbed (per gram of charcoal) is:
The most abundant elements by mas in the body of a healthy human adult are Oxygen (61.4%), Carbon (22.9%). Hydrogen (10.0)%), and Nitrogen (2.6%). The weight which a 75kg person would gain if all .1H atoms are replaced by .2H atoms is