Physical Properties Of Metals -1 - Class 10 MCQ

Ionic compounds conduct electricity only in the molten state and not in solid state.

Sodium and calcium are the metals obtained by electrolysis of their chlorides in molten state. Both are reactive metals.

The metal sodium, calcium and magnesium are highly reactive to water and make their hydroxides. 
Iron is a less reactive metal and does not show any reaction while treated with cold as well as hot water but will react with steam and form metal oxides and hydrogen gas.

3Fe(s)+4H₂​O(g)→Fe₃​O₄​(s)+4H₂​(g)

All metals are solid at room temperature except for mercury. Mercury(hg) metal exists as a liquid at room temperature.

Magnesium is low in reactivity in the reactivity series than sodium and potassium, it reacts with hot water and steam.

Electrolytic refining is used for metals like Cu, Zn, Ag, Au etc. The method to be used for refining an impure metal depends on the nature of the metals as well as on the nature of impurities present in it. So, metals Au (gold) and Cu (copper) are refined by electrolytic refining.

The properties that are expected from a metal for use as cooking utensils are good thermal conductivity and high melting point.

During electrolytic refining of zinc (Zn), the pure zinc metal is deposited on cathode. It is connected to the negative terminal of the battery. Zn²⁺ ions from the solution move towards the negatively charged cathode. Hence Zn is deposited on the cathode.

Silver reacts with H₂S present in the air to form Ag₂S which is black in colour.

An alloy is a mixture of two metals (or a metal and a non-metal) mixed homogeneously.