The colour of the solution formed when ethyne reacts with an acidic solution of potassium tetraoxomanganate (VII) is

An element which can exist in two or more forms in the same physical state, exhibits

Which of the following changes is characteristic of an alpha-particle emission?

Which of the following molecules has a linear structure?

An element X has an atomic number of 16. What is its most likely oxidation state in its binary compounds?

Which of the following sets of elements are arranged in order of decreasing atomic size in the Periodic Table?

What is the mass number of an element having 20 neutrons, 15 protons and 15 electrons?

The electronic configuration of an element X is 1s22s 22s63p 2 3p4. It can be deduced that X

Which of the following can be used to predict the type of bonding in HCI?