The symbol of mercury is (b) Hg .
Among the options listed, the metal is (c) Sodium . Sodium is an alkali metal known for being highly reactive, especially with water.
The most unreactive metal is (d) Gold . Gold is known for its lack of reactivity and resistance to tarnishing or corrosion.
The soft metal among the choices is (a) Sodium . Sodium is soft enough to be cut with a knife.
A molecule of a compound from the options given is (c) Water . Water (H₂O) is a compound made up of two hydrogen atoms bonded to one oxygen atom.
The positively charged particles in an atom are called (c) protons . Protons reside in the nucleus of an atom and have a positive charge.
The non-metal typically found in a liquid state is (c) Bromine . Bromine is one of the only two elements that are liquid at room temperature (the other being mercury).
II. True or False Statements:
False. A molecule is the smallest particle of a compound that retains the chemical properties of that compound, not an element.
True. A pure substance consists of particles of only one kind, either elements or compounds.
False. Mercury is a metal . It is a heavy, silvery element that is liquid at room temperature.
True. Water is indeed a compound made up of hydrogen and oxygen gas, though the gases combine to form liquid water.
False. Constituents of a mixture are not present in a fixed proportion; they can mix in any ratio.