Science : Ch 03 – Metals and Non-metals

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

Which of the subsequent oxide(s) of iron would be obtained on prolonged reaction of iron with steam?

An aluminium strip is retained immersed in freshly prepared ferrous sulphate solution taken in a test tube, the change state is that:

The electronic configurations of three elements X, Y and Z are X — 2, 8; Y — 2, 8, 7 and Z — 2, 8, 2. Which of the following is correct?

An element A is mushy and can be cut with a knife. This is very reactive to air and cannot be kept in open air. It reacts vigorously with water. Identify the element from the following:

Electrical wires have a coating of an insulating material. The material, overall adopted is:

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?

Hydrogen gas is not evolved when a metal reacts with nitric acid because

Name a metal that have very low melting points.

Metal that is best conductor of electricity

Give the formula of the stable binary compound that would be formed by the combination of following pair of elements: Mg and N₂

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

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?