Materials Test ...

Which one of the following statements is correct?

(i) A more reactive metal can displace a less reactive metal from its salt solution.
(ii) Copper can displace magnesium from its salt solution.
(iii) Magnesium can displace copper from its salt solution,
(iv) A less reactive metal can displace a more reactive metal from its salt solution.

____: hard non-metal : : _____ : soft metal.

Metals are generally hard. Which of the following metals is an exception and can be cut with a knife?

Which one of the chemical reactions is incorrect?

(i) FeSO₄ + Zn → ZnSO₄ + Fe

(ii) ZnSO₄ + Fe → FeSO₄ + Zn

(iii) 2Au + 2HCl → 2AuCl + H₂

(iv) Mg + CuSO₄ → MgSO₄ + Cu

Oxides of non-metals:

A non-metal which catches fire on being exposed to air is:

A non-metal which is a good conductor of electricity.

Aluminum can displace __ from its salt solution.

How well the substance can be hammered into sheets describes its:

Which of the following metals reacts with cold water vigorously?