P,Q,R and S are metals in the same group in the Periodic Table but in periods 3,4, 5 and 6 respectively which of them loses electrons least readily? Posted on:
Given that the electronic configuration of an element X is 1s22s22p63s 23p4, it can be deduced that X Posted on:
What is the mass number of an element if its atom contains 10 protons, 10 electrons and 12 neutrons? Posted on:
If 20 cm3 of distilled water is added to 80 cm3 of 0.50 mol dm-3 hydrochloric acid, the concentration of the acid will change to Posted on:
When sodium hydroxide solution is added to a solution of zinc salt, the white precipitate fromed redissolves in excess sodium hydroxide because Posted on:
A colourless, odourless liquid T, gives effervesce with sodium trioxocarbonate (IV) and a white precipitate with silver trioxonitrate (V) solution T is mose probably Posted on:
Two-organic substances are labelled K and L if K gave a blue-black colour with iodine solution and L gave a deep red precipitate with Million’s reagent, it can be concluded that Posted on:
