silver carbonate and oxy salts of silver on heating strongly gives silver metal, same is the case with mercury also.
1) Carbonates of alkali metals except Li2CO3 are stable towards heat.
2) Sulphites of lead, barium and strontium are insoluble in water, Calcium sulphite is partially soluble in water, most of the other sulphites are soluble in water.
3) In reactions that involve nascent oxygen, we don?t use HCl because it is highly susceptible to oxidation nd gives out Cl2 gas.
4) I2 soln is almost insoluble in water, there fore, the I2 soln used is iodine in alcohol.
5) Pb, Ba, Sr form sulphates that don?t dissolve in any medium.
6) Sulphides of alkali metals and ammonium are soluble, the rest are partially soluble or insoluble.
7) *******reaction of Sulphide ions with sodium nitroprusside , Na2[Fe(CN)5NO]:
The medium shud b strictly alkaline, a purple colored compound is formed, Na2S + Na2[Fe(CN)5NO] -> Na2[Fe(CN)5OS]
8) All nitrides are highly soluble in water
9) Nitrites on treating with cold dilute acid gives pale blue nitrous acid which when heated gives NO2 gas.
10) In brown ring test, we need freshly prepared FeSO4 because FeSO4 is susceptible to oxidation and it forms Fe2(SO4)3.
11) Nitrates give brown compound with concentrated H2SO4.
12) ** The only nitrite affected by heat is ammonium nitrite.
13) Ammonium nitrate decomposes completely giving non-reactive N2 and water vapor, NH4NO3 also gives watervapour, but it also gives highly reactive N2O.
14) Sr, Ba, Pb form insoluble sulphates, Calcium sulphate is partially soluble in water.
15) Any salt of silver with hypo forms this complex always: Na3[Ag(S2O3)2], it is a soluble complex.
16) Mercurous salts exist as dimers, most soluble mercury salt is mercurous nitrate
17) Chromic salts are green violet or pink violet in color, but in aqueous or acidic soln, they always produce dark green color.
18) The sulphate of strontium ion is insoluble in acid and alkali.
19) Sr+2 ion gives scarlet red flame
20) Mn+2 salts and their solns are pink in color.
Moderation Team
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