Science : Ch 03 – Metals and Non-metals

Which one of the following metals does not respond with cold as well as hot water?

The solution of one of the following compounds will not conduct electricity. This compounds is:

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

The composition of aqua-regia is:

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:

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

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

Which metal can be displaced by copper from its salt solution?

When calcium metal is added to water, the gas evolved does not catch fire but the same gas evolved on adding potassium metal to water catches fire.

Metal that can be cut by knife

The Most malleable and ductile metal

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

Which metal is less reactive?

Which metal is less reactive?