Dimethyl glyoxime gives a red precipitate with Ni2+, which is used for its detection. To get this precipitate readily the best pH range is
< 1
2-3
3- 4
9- 11
The statement true for is
it has a non-linear structure
it is called pseudohalogen
the formal oxidation state of nitrogen in this anion is -1
it is isoelectronic with NO2
The compound insoluble in water is
mercurous nitrate
mercuric nitrate
mercurous chloride
mercurous perchlorate.
C.
mercurous chloride
According to "solubility rule" following compounds are soluble in water:
(i) All common group IA and NH4+ compounds.
(ii) All common NO3- (nitrate), CH3COO-(acetate), ClO4, (perchlorate) compounds.
(iii) All common Cl- , Br- , I- compounds, except those of Ag+, Pb2+,Cu+ and Hg22+(mercurous)
(iv) All common SO42- (sulphate) compounds, except those of Ca2+, Sr2+, Ba2+ and Pb2+.
How much energy is released when 6 moles of octane is burnt in air? Given for CO2(g) , H2O(g) and C8H18(l) respectively are - 490, -240 and +160 kJ/mol.
-6.2 kJ
-37.4 kJ
-35.5 kJ
-20.0 kJ
For the equilibrium at 1 atm and 298K.
standard free energy change is equal to zero (= 0)
free energy change is less than zero ( < 0)
standard free energy change is less than zero (< 0)
standard free energy change is greater than zero (G° > 0).