Science : Ch 03 – Metals and Non-metals

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

Which one of the following properties is not commonly exhibited by ionic compounds?

Non-metals are not lustrous. Which of the following non-metals is lustrous?

Which among the following Declaration is incorrect for magnesium metal?

Which one of the following four metals would be replaced from the solution of its salts by the other three metals?

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:

2 ml each of conc. HCl, HNO₃, and a mixture of conc. HCl and conc. HNO3 in the ratio of 3:1 were taken in test tubes labelled as : A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C. The metal could be:

1. AI
2. Au
3. Cu
4. Pt

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

Why do ionic compounds conduct electricity in molten state? Because

Metal that can be cut by knife

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?