Chapter 3 – Metals and Non – Metals

Chemically rust is

Setting of Plaster of Paris takes place due to

Heating pyrites to remove sulphur is called

The atomic number of an element ‘X’ is 12. Which inert gas is nearest to X?

During smelting, an additional substance is added which combines with impurities to form a fusible product. It is known as

The electronic configuration of three elements X, Y and Z are as follows:
X = 2, 4, Y = 2, 7, Z = 2,1 Which two elements will combine to form an ionic compound and write the correct formula,

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

Galvanisation is a method of protecting iron from grudging by coating with a thin layer of

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?

Copper objects lose their shine and form green coating of

Which of the statements about the reaction,
ZnO + CO → Zn + CO2 is correct ?

In extraction of copper, the flux used is

Metal always found in free state is:

The earthy impurities associated with mineral used in metallurgy are called

A mineral is known as ore if metal

Which of the following is the correct arrange-ment of the given metals in ascending order of their reactivity?
Zinc, Iron, Magnesium, Sodium

Al2O3 + 2NaOH → …… + H2O

Non-metals form covalent chlorides because

The highly reactive metals like Sodium, Potas-sium, Magnesium, etc. are extracted by the

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

An iron nail was suspended in CuSO4 solution and kept for a while the solution is

Which one among the following is an acidic oxide?

The process in which a carbonate ore is heated strongly in the absence of air to convert it into metal oxide is called

The sulphide ore among the following is

Oxides of moderately reactive metals like Zinc, Iron, Nickel, Tin, Copper etc. are reduced by using

Most abundant metal on the surface of the earth

Some crystals of CuSO4 were dissolved in water. The color of the solution obtained would be

In thermite welding a mixture of …… and …… is ignited with a burning magnesium ribbon which produces molten iron metal as large amount of heat is evolved.

Zone refining is used for the

In the thermite process, the reducing agent is