Jamb Chemistry CBT Practice Quiz

3.06 g of a sample of potassium trioxochlorate
(v) (KCIO3) was required to make a saturated solution
with 10cm3 of water at 25oC. The solubility of the salt at
25oC is [K=39,CI =35.5,O=16]

An unknown organic compound X has a relative molecular mass of 180. It is a colourless crystalline solid, readily soluble in water. X contains the element C, H, and O in the atomic ratio 1:2:1. The compound has a sweet taste and melts on heating. In the presence of yeast and in the absence of air X is converted to compound Y in the absence of air, X is converted to compound Y and colorless gas. Compound Y reacts with sodium metal to produce a gas Z which gives a €˜pop€™ sound with a glowing splint. Y also reacts with ethanoic acid to give a sweet smelling compound W.

1. Fe + H2 SO4 †’H2 + FeSO4
2. FeSO4 + H2S †’ FeS + H2 SO4
3. FeCl + CI2 †’2FeCL3
4. FeCl3 + SnCI2 †’2FeCL2 + SnCI4

2.5g of a hydrated barium salt gave on heating, 2.13g of the anhydrous salt. Given that the relative molecular mass of the anhydrous salt is 208, the number of molecules of water of crystallization of the barium salt is

The rate of the above reaction will be greatly increased if...

An unknown organic compound X has a relative molecular mass of 180. It is a colourless crystalline solid, readily soluble in water. X contains the element C, H, and O in the atomic ratio 1:2:1. The compound has a sweet taste and melts on heating. In the presence of yeast and in the absence of air X is converted to compound Y in the absence of air, X is converted to compound Y and colourless gas. Compound Y reacts with sodium metal to produce a gas Z which gives a €˜pop€™ sound with a glowing splint. Y also reacts with ethanoic acid to give a sweet-smelling compound W.