Which of the following statements is/are true?(a) Mercury exists as solid at room temperature(b) Metals like gallium and caesium have very high melting points(c) Iodine is a lustrous non-metal(d) Lithium and potassium have low densities and low melting pointsOnly one correct answerA.Only (b)B.Only (b) and (c)C.Only (c) and (d)D.(a), (b) and (c)

Which if the following is TRUE of non-metals?Athey are generally solids at room temperature Bthey are all non-conductors of electricity Cthey generally have low melting pointsDthey have high density

Which of the following is NOT true of non-metals?Athey are poor conductors of heat Bthey react with dilute acids to give hydrogen gas Cthey usually have low melting and boiling points Dthey are not malleable or ductile

Which of the following is NOT a property of transition metals?High densityLow boiling pointTough and hardHigh melting point

Which one of the following statements is false? Most ionic compounds are solids at room temperature and atmospheric pressure. Metal alloys tend to be hard and brittle. The bond between silicon and oxygen is primarily covalent. The bonding in LiH is primarily ionic. Molten sodium chloride is an excellent conductor of electricity.

Which of the following only contain non- metals?