In which of the following pairs of element is allotropy exhibited by each element?

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?

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...

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

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?