Which of the following compounds would dissolve in water to give a solution whose pH is less than 7

The mass spectrometer can be used to measure

An atom has a mass number of 45 and an atomic number of 21 what is it's neutron number

A radioactive element with mass number 234 and atomic number 88 decay by alpha emission to give an atom R what is the atomic and mass number of atom R

Which of the following statements is not true of halogens

Elements in the same group in the periodic table have

Water molecules are held together by

If 5cm3 of 0.02 mol/dm3 Na2CO3 was diluted with distilled water to obtain 250cm3 solution what is the concentration of the resulting. Solution

The high solubility of ethanol is due to its

In dry leclanche cell manganese (iv) oxide acts as

Calculate the quantity of electricity passed when 0.4ampere flows for 1hour 20mins through an electrolytic cell

A mixture of kerosene and diesel can separated by

When ethanol is heated with excess concentrated tetraoxosulphate (vi) acid the organic product formed is

When 100cm3 of saturated solution of KClO3 at 40degree Celsius is evaporated 14g of the salt is recovered, what is the solubility of the salt at 40degree Celsius (KClO3 = 125.5)

The hydrolysis of groundnut oil by potassium hydroxide is known as

What is the main type of reaction alkenes undergo ?

An hydrocarbon has 88.9% carbon has the empirical formular (H = 1, C = 12)

Which of the following alloys is mainly used in making statutes

Chemicals that are produced in small quantities and to a very high level of purity are called