Is air a mixture or a compound?

Is milk a mixture or a compound?

A chromatography column, packed with silica gel as stationary phase, was used to separate a mixture of compounds consisting of (A) benzanilide (B) aniline and (C) acetophenone. When the column is eluted with a mixture of solvents, hexane : ethyl acetate (20 : 80), the sequence of obtained compounds is

Substance A is 1:1 mixture of two compounds I and II: Will the mixture show optical activity ?

Petroleum is a mixture of groups of compounds such as bitumen, diesel and petroleum gas

Match the type of mixture of compounds in Column I with the technique of separation /purifaction given in column II

Which of the following alkali metals when burnt in air forms a mixture of oxide as well as nitride?

Mixture of above three organic compound was subjected to aq NaHCO ""_3 and followed by dil NaOH. Compounds which will be soluble in given solvent will be :

An alkene (A) ozonolysis gives a mixture of two carbonyl compounds. Mixture on Clemmensen reduction gives just one alkane (B). (B) is the lowest alkane which in pure form can not be prepared by standard Wurtz method. (A) is

Compound which rotates the plane polarised light is known as optically active compound . On the basis of direction of rotation two forms of an optically active compounds are termed as dextro and laevo rotatory . The two are termed as enantiomers . If we have a 1 : 1 mixture of d and l isomers of a given chiral compound , optical rotation of such mixture is zero Such a mixture is optically inactive and is called a recemic modification. The net specific rotation of any mixture of the d and isomers of a given chiral compound is equal to the weighted average of the rotations due to both the isomers Mathematically if can be expressed as : [alpha]_(net) =f_(d) [alpha_(d)] + f_(1) [alpha_(l)] Where f_(a) and f_(l) are fractions of d and l isomers respectively and [alpha_(d)] , [alpha_(l)] are their specific rotations The pure d isomer of certain chiral compound has [alpha]_(d)^(25) =+ 55^(@) .A non racemic mixture of this compound has a net [alpha]_(d)^(25) =- 11^(@) . What is the fractions of this isomer in mixture ?