Science : Ch 03 – Metals and Non-metals

Which of the subsequent quality is generally not shown by metals?

The composition of aqua-regia is:

Although metals form basic oxides, which of the subsequent metals form an amphoteric oxide?

Shwetha took three beakers A, B and C containing zinc sulphate, silver sulphate and iron (II) sulphate solutions respectively. Copper pieces were added to each beaker. The solution will Become visible blue in the case of:

Which of the following Metal have very low melting points?

Why should we not throw small pieces of sodium into a sink in the laboratory? Because of

Metal that can be cut by knife

Metal that is best conductor of electricity

Give the formula of the stable binary compounds that would be formed by the combination of following pair of elements: Li and O₂

Name one non-metal that exist in liquid state at room temperature.

Name two metals having melting point less than 310 K (37°C).

Name a metal which is highly malleable

A non-metal X exists in two diferent forms Y and Z. Y is the hardest natural substance, whereas Z is a good conductor of electricity. Identify X, Y and Z.

When a metal X is treated with cold water, it gives a basic salt Y with molecular formula XOH (molecular mass = 40) and liberates a gas Z which easily catches fre. Identify X, Y and Z.

Which metal is less reactive?