The pH of 0.005 M H₂SO₄ is :

• 2.5

• 1.5

• 1.0

• 2.0

Lassaigne's test is used to detect :

• nitrogen and halogens

• sodium and halogens

• halogens and sulphur

• nitrogen, sulphur and halogens

The number of possible structural isomers of butene are:

• 3

• 2

• 4

• 1

Disymmetric object is one which is:

• superimposable on its mirror image

• non-superimposable on its mirror image

• optically inactive

• achiral

Cycloalkane has the formula :

• C_nH_2n+2

• C_nH_2n-2

• C_nH_2n

• C_2nH₂

Three fused benzene rings are found in:

• naphthalene

• anthracene

• phenanthroline

• triphenyl methane

17.

To differentiate between carbon-12, carbon-13 and carbon-14, the instrument that you would use is :

• infra-red spectrometer

• atomic absorption spectrometer

• mass spectrometer

• ultraviolet spectrometer

A mixture of sand and iodine can be separated by:

• crystallisation

• sublimation

• distillation

• fractionation

Pyrosilicate ion is

• ${\mathrm{SiO}}_2^{2-}$

• ${\mathrm{Si}}_2{\mathrm{O}}_7^{6-}$

• ${\mathrm{SiO}}_4^{2-}$

• ${\mathrm{SiO}}_3^{-}$

The effective component, of bleaching powder............is the of calcium :

• Cl^-

• OCl^-

• O^2-

• O₂Cl^-