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

When mixture of potassium cyanate and ammonium chloride is heated, it gives

Sodalime test is used to detect the following element in an organic compound?

Which of the following compounds does not show Lassaigne's test for nitrogen?

The most suitable method for separation of 1 : 1 mixture of ortho and para- nitro phenol is

Which of the following compounds will show metamerism?

A gaseous hydrocarbon has 85% carbon and vapour density of 28. The possible formula of the hydrocarbon will be

If two compounds have the same empirical formula but different molecular formulae, they must have

The Lassaigne's extract is boiled with dilute HNO₃ before testing for halogens because

An organic compound contains  C = 40%  O = 53.3%  and H = 6.60% . The empirical formula of the compound is