Salt analysis

for post no.26----------------sodium and potassium

ans to the [Zn⁺²] question should be (c) according to le-chatlier principle

ans should be (a ) fecl3/dil.hcl .blood red due to formation of fe(cns)3

Nitrite + acetic acid + thiourea → N₂+SCN^-+2H₂O

Formation of the product in the above reaction can be identified by:

(a) FeCl₃/dil.HCl when blood red colour appears

(b) FeCl₃/dil.HCl when blue colour appears

(c)K₂Cr₂O₇/dil.HCl when green colour appears

(d) KMnO₄/Hcl when colourless sol is formed.

Last one :

A - NH₄NO₃
B - H₂O
C - N₂O
D - P₄O₁₀

HINT : only oxide liquid at room temp. possible is perhaps H₂O. that stong dehydrating agent struck for P₄O₁₀. AND finally dat 250⁰C data struck for NH₄NO₂.

FOR PREVIOUS ONE its perhaps HCl (aq.).

A colourless inorganic salt (A) decomposes completely at abt 250

celsisus to give onli 2 prodcts (B) and (c) leaving no residue.The

oxide (c) is a liquid at room temp and neutral to moist litmus

paper whil the gas (B) is neutral oxide.White phosphorus burns

in excess of (B) to poduce a strong white dehydrating

agent(D). Write eqs for the reactions involved in the process..

To increase significantly the conc of free Zn²⁺ion in a sol of the

complx ion [Zn(NH₃)₄]²⁺,

Zn²⁺(aq)+ 4 NH₃ (aq) → [Zn(NH₃)₄]²⁺(aq)

add to the sol some:

(A) H₂O

(b) HCl(aq)

(c) NH₃(aq)

(D) NH₄Cl(aq)

not sure, but perhaps c). seen somewhere.

Fulminating gold is:

(a) AuCl₃

(b) Au₂S

(c) Au(NH₂) = NH

(d) H[Au(Cl)₄)]

Philosopher's wool on treatment with cobalt nitrate produces

(a) CoBaO₂

(b) CoZnO₂

(c) CoSrO₂

(d) CoMgO₂

accord to me `a` is the right answer.

as its 5 water molecules associated with it. and it melts at 30 degree celcius (which is room temp generally)

ya,this H₃NO₃S is Sulfamic acid.

The action of conc H₂SO₄ on urea results in
the production of a white crystalline solid X of formula H₃ NO₃S,a monobasic acid. on treatment with sod nitrite and dil.HCl at 0 degree.it liberates one mol of N₂ per mol of X, and on addition of aq. barium chloride, the resulting sol yields one mol of BaSO₄ per mol of X taken. Deduce the structure of X.

wikipedia will made us mad.

@ msp and everyone
here is the content from wiki to support my answer
""Deliquescent materials are substances (mostly salts) that have a strong affinity for moisture and will absorb relatively large amounts of water from the atmosphere if exposed to it, forming a liquid solution. Deliquescent salts include calcium chloride, magnesium chloride, zinc chloride, potassium carbonate, potassium phosphate, carnallite, ferric ammonium citrate, potassium hydroxide and sodium hydroxide. ""

if u wanna cross-check urself ,here is the link
http://en.wikipedia.org/wiki/Hygroscopy

http://en.wikipedia.org/wiki/Category:Deliquescent_substances

Q1 a,b
Q2 b[1]

and fr d first one, b555 hs given d perfect answer