Samacheer Kalvi solutions for Science [English] Class 10 SSLC TN Board chapter 8 - Periodic Classification of Elements [Latest edition]

The number of periods and groups in the periodic table are ______

The basis of modern periodic law is ______.

______ group contains the member of the halogen family.

______ is a relative periodic property.

Chemical formula of rust is ______

In the aluminothermic process, the role of Al is _____.

The process of coating the surface of the metal with a thin layer of zinc is called ______

Which of the following have inert gases 2 electrons in the outermost shell.

Neon shows zero electron affinity due to ______.

______ is an important metal to form an amalgam.

If the electronegativity difference between two bonded atoms in a molecule is greater than 1.7, the nature of bonding is ______

______ is the longest period in the periodical table.

______ forms the basis of the modern periodic table.

If the distance between two Cl atoms in a Cl₂ molecule is 1.98Å, then the radius of the Cl atom is ______.

Among the given species A–, A+, and A, the smallest one in size is ______.

The scientist who propounded the modern periodic law is ______.

Across the period, ionic radii ______

______ and ______ are called inner transition elements.

The chief ore of Aluminium is ______

The chemical name of rust is ______.

Match the following

Moseley’s periodic table is based on atomic mass.

Ionic radius increases across the period from left to right.

All ores are minerals, but all minerals cannot be called ores.

Al wires are used as electric cables due to their silvery-white colour.

An alloy is a heterogenous mixture of metals.

Answer the following question using the data given below:

• Assertion: The nature of bond in HF molecule is ionic
• Reason: The electronegativity difference between H and F is 1.9.

Answer the following question using the data given below:

• Assertion: Magnesium is used to protect steel from rusting.
• Reason: Magnesium is more reactive than iron.

Answer the following question using the data given below:

• Assertion: An uncleaned copper vessel is covered with a greenish layer.
• Reason: copper is not attacked by alkali.

A is a reddish-brown metal, which combines with O₂ at < 1370 K gives B, a black coloured compound. At a temperature > 1370 K, A gives C which is red in colour. Find A, B, and C with reaction.

A is a silvery-white metal. A combines with O₂ to form B at 800°C, the alloy of A is used in making the aircraft. Find A and B.

What is rust?

Give the equation for the formation of rust.

State two conditions necessary for rusting of iron.

State the reason for the addition of caustic alkali to bauxite ore during the purification of bauxite.

Along with cryolite and alumina, another substance is added to the electrolyte mixture. Name the substance and give one reason for the addition.

The electronic configuration of metal A is 2, 8, 18, 1.

The metal A when exposed to air and moisture forms B a green layered compound. A with con. H2 SO4 forms C and D along with water. D is a gaseous compound. Find A, B, C, and D.

Explain the smelting process.

Metal A belongs to period 3 and group 13. A in red hot condition reacts with steam to form B. A with strong alkali forms C. Find A, B, and C with reactions.

Name the acid that renders aluminum passive. Why?

Identify the bond between H and F in the HF molecules.

What property forms the basis of identification?

How does the property vary in periods and in groups?