In the purification of town water supply, alum is used principally to?

Which of the following water samples will have the highest titre value when titrated for the Ca2+ ions using soap solution?

An element Z, contained 90% of 168Z and 10% of Z1818 its relative atomic mass is?

If d represents the density of a gas and K is a constant, the rate of gaseous diffusion r is related to d by the equation?

Oil spillage in ponds and creeks can be cleaned up by?

Temp (°C) 25 35 45 Time (seconds) 72 36 18 The times taken for iodine to be liberated in the reaction between sodium thiosulphate and hydrochloric acid at va...

The atomic numbers of two elements X and Y are 12 and 19 respectively. The bond of these two elements is?

An isotope has an atomic number of 17 and a mass number of 36. Which of the following gives the correct number of neutrons and protons in an atom of the isot...

If 24.83 cm3 of 0.15 M NaOH is titrated to its end point with 39.45 cm3 of HCl, what is the molarity of the HCl?