If two compounds have the same empirical formula but different molecular formulae, they must have
Different percentage composition
Different molecular weights
Same viscosity
Same vapour density
Which of the following statement is wrong?
Using Lassaigne's test nitrogen or sulphur present in an organic compound can be tested.
Using Beilstein's test the presence of halogen in a compound can be tested.
Lassaigne's test fails to identify nitrogen in diazo compound.
In the estimation of carbon an organic compound is heated with CaO in a combustion tube.
Two elements X (atomic weight = 75) and Y (atomic weight = 16 ) combine to give a compound having 75.8 % X. The formula of the compound is
XY
X2Y
X2Y2
X2Y3
The kind of valency that exists in CaH2 and C2H2 is
Electrovalency in CaH2 and covalency in C2H2
Electrovalency in both
Covalency in CaH2 and electrovalency in C2H2
Covalency in both
An organic compound contains C = 40% O = 53.3% and H = 6.60% . The empirical formula of the compound is
CH2O
CHO
CH4O2
C2H2O
The most suitable method for separation of 1 : 1 mixture of ortho and para- nitro phenol is
Sublimation
Chromatography
Crystallization
Steam distillation
When mixture of potassium cyanate and ammonium chloride is heated, it gives
Urea
Methanamide
Ethanamide
Ethanamine
The Lassaigne's extract is boiled with dilute HNO3 before testing for halogens because
Ag2S is insoluble in HNO3
AgCN is soluble in HNO3
Na2S and NaCN are decomposed by HNO3
Silver halides are soluble in HNO3
Anthracene is purified by
Filtration
Distillation
A gaseous hydrocarbon has 85% carbon and vapour density of 28. The possible formula of the hydrocarbon will be
C3H6
C2H4
C2H2
C4H8